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2 | mjames | 1 | /** |
2 | ****************************************************************************** |
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3 | * @file stm32f1xx_ll_spi.c |
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4 | * @author MCD Application Team |
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5 | * @brief SPI LL module driver. |
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6 | ****************************************************************************** |
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7 | * @attention |
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8 | * |
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9 | * Copyright (c) 2016 STMicroelectronics. |
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10 | * All rights reserved. |
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11 | * |
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12 | * This software is licensed under terms that can be found in the LICENSE file |
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13 | * in the root directory of this software component. |
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14 | * If no LICENSE file comes with this software, it is provided AS-IS. |
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15 | * |
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16 | ****************************************************************************** |
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17 | */ |
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18 | #if defined(USE_FULL_LL_DRIVER) |
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19 | |||
20 | /* Includes ------------------------------------------------------------------*/ |
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21 | #include "stm32f1xx_ll_spi.h" |
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22 | #include "stm32f1xx_ll_bus.h" |
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23 | #include "stm32f1xx_ll_rcc.h" |
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24 | |||
25 | #ifdef USE_FULL_ASSERT |
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26 | #include "stm32_assert.h" |
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27 | #else |
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28 | #define assert_param(expr) ((void)0U) |
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29 | #endif /* USE_FULL_ASSERT */ |
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30 | |||
31 | /** @addtogroup STM32F1xx_LL_Driver |
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32 | * @{ |
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33 | */ |
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34 | |||
35 | #if defined (SPI1) || defined (SPI2) || defined (SPI3) |
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36 | |||
37 | /** @addtogroup SPI_LL |
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38 | * @{ |
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39 | */ |
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40 | |||
41 | /* Private types -------------------------------------------------------------*/ |
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42 | /* Private variables ---------------------------------------------------------*/ |
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43 | |||
44 | /* Private constants ---------------------------------------------------------*/ |
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45 | /** @defgroup SPI_LL_Private_Constants SPI Private Constants |
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46 | * @{ |
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47 | */ |
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48 | /* SPI registers Masks */ |
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49 | #define SPI_CR1_CLEAR_MASK (SPI_CR1_CPHA | SPI_CR1_CPOL | SPI_CR1_MSTR | \ |
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50 | SPI_CR1_BR | SPI_CR1_LSBFIRST | SPI_CR1_SSI | \ |
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51 | SPI_CR1_SSM | SPI_CR1_RXONLY | SPI_CR1_DFF | \ |
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52 | SPI_CR1_CRCNEXT | SPI_CR1_CRCEN | SPI_CR1_BIDIOE | \ |
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53 | SPI_CR1_BIDIMODE) |
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54 | /** |
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55 | * @} |
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56 | */ |
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57 | |||
58 | /* Private macros ------------------------------------------------------------*/ |
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59 | /** @defgroup SPI_LL_Private_Macros SPI Private Macros |
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60 | * @{ |
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61 | */ |
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62 | #define IS_LL_SPI_TRANSFER_DIRECTION(__VALUE__) (((__VALUE__) == LL_SPI_FULL_DUPLEX) \ |
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63 | || ((__VALUE__) == LL_SPI_SIMPLEX_RX) \ |
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64 | || ((__VALUE__) == LL_SPI_HALF_DUPLEX_RX) \ |
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65 | || ((__VALUE__) == LL_SPI_HALF_DUPLEX_TX)) |
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66 | |||
67 | #define IS_LL_SPI_MODE(__VALUE__) (((__VALUE__) == LL_SPI_MODE_MASTER) \ |
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68 | || ((__VALUE__) == LL_SPI_MODE_SLAVE)) |
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69 | |||
70 | #define IS_LL_SPI_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_SPI_DATAWIDTH_8BIT) \ |
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71 | || ((__VALUE__) == LL_SPI_DATAWIDTH_16BIT)) |
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72 | |||
73 | #define IS_LL_SPI_POLARITY(__VALUE__) (((__VALUE__) == LL_SPI_POLARITY_LOW) \ |
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74 | || ((__VALUE__) == LL_SPI_POLARITY_HIGH)) |
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75 | |||
76 | #define IS_LL_SPI_PHASE(__VALUE__) (((__VALUE__) == LL_SPI_PHASE_1EDGE) \ |
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77 | || ((__VALUE__) == LL_SPI_PHASE_2EDGE)) |
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78 | |||
79 | #define IS_LL_SPI_NSS(__VALUE__) (((__VALUE__) == LL_SPI_NSS_SOFT) \ |
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80 | || ((__VALUE__) == LL_SPI_NSS_HARD_INPUT) \ |
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81 | || ((__VALUE__) == LL_SPI_NSS_HARD_OUTPUT)) |
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82 | |||
83 | #define IS_LL_SPI_BAUDRATE(__VALUE__) (((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV2) \ |
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84 | || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV4) \ |
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85 | || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV8) \ |
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86 | || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV16) \ |
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87 | || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV32) \ |
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88 | || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV64) \ |
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89 | || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV128) \ |
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90 | || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV256)) |
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91 | |||
92 | #define IS_LL_SPI_BITORDER(__VALUE__) (((__VALUE__) == LL_SPI_LSB_FIRST) \ |
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93 | || ((__VALUE__) == LL_SPI_MSB_FIRST)) |
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94 | |||
95 | #define IS_LL_SPI_CRCCALCULATION(__VALUE__) (((__VALUE__) == LL_SPI_CRCCALCULATION_ENABLE) \ |
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96 | || ((__VALUE__) == LL_SPI_CRCCALCULATION_DISABLE)) |
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97 | |||
98 | #define IS_LL_SPI_CRC_POLYNOMIAL(__VALUE__) ((__VALUE__) >= 0x1U) |
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99 | |||
100 | /** |
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101 | * @} |
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102 | */ |
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103 | |||
104 | /* Private function prototypes -----------------------------------------------*/ |
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105 | |||
106 | /* Exported functions --------------------------------------------------------*/ |
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107 | /** @addtogroup SPI_LL_Exported_Functions |
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108 | * @{ |
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109 | */ |
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110 | |||
111 | /** @addtogroup SPI_LL_EF_Init |
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112 | * @{ |
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113 | */ |
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114 | |||
115 | /** |
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116 | * @brief De-initialize the SPI registers to their default reset values. |
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117 | * @param SPIx SPI Instance |
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118 | * @retval An ErrorStatus enumeration value: |
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119 | * - SUCCESS: SPI registers are de-initialized |
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120 | * - ERROR: SPI registers are not de-initialized |
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121 | */ |
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122 | ErrorStatus LL_SPI_DeInit(SPI_TypeDef *SPIx) |
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123 | { |
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124 | ErrorStatus status = ERROR; |
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125 | |||
126 | /* Check the parameters */ |
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127 | assert_param(IS_SPI_ALL_INSTANCE(SPIx)); |
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128 | |||
129 | #if defined(SPI1) |
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130 | if (SPIx == SPI1) |
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131 | { |
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132 | /* Force reset of SPI clock */ |
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133 | LL_APB2_GRP1_ForceReset(LL_APB2_GRP1_PERIPH_SPI1); |
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134 | |||
135 | /* Release reset of SPI clock */ |
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136 | LL_APB2_GRP1_ReleaseReset(LL_APB2_GRP1_PERIPH_SPI1); |
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137 | |||
138 | status = SUCCESS; |
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139 | } |
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140 | #endif /* SPI1 */ |
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141 | #if defined(SPI2) |
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142 | if (SPIx == SPI2) |
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143 | { |
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144 | /* Force reset of SPI clock */ |
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145 | LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_SPI2); |
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146 | |||
147 | /* Release reset of SPI clock */ |
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148 | LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_SPI2); |
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149 | |||
150 | status = SUCCESS; |
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151 | } |
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152 | #endif /* SPI2 */ |
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153 | #if defined(SPI3) |
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154 | if (SPIx == SPI3) |
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155 | { |
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156 | /* Force reset of SPI clock */ |
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157 | LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_SPI3); |
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158 | |||
159 | /* Release reset of SPI clock */ |
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160 | LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_SPI3); |
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161 | |||
162 | status = SUCCESS; |
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163 | } |
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164 | #endif /* SPI3 */ |
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165 | |||
166 | return status; |
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167 | } |
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168 | |||
169 | /** |
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170 | * @brief Initialize the SPI registers according to the specified parameters in SPI_InitStruct. |
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171 | * @note As some bits in SPI configuration registers can only be written when the SPI is disabled (SPI_CR1_SPE bit =0), |
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172 | * SPI peripheral should be in disabled state prior calling this function. Otherwise, ERROR result will be returned. |
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173 | * @param SPIx SPI Instance |
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174 | * @param SPI_InitStruct pointer to a @ref LL_SPI_InitTypeDef structure |
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175 | * @retval An ErrorStatus enumeration value. (Return always SUCCESS) |
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176 | */ |
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177 | ErrorStatus LL_SPI_Init(SPI_TypeDef *SPIx, LL_SPI_InitTypeDef *SPI_InitStruct) |
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178 | { |
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179 | ErrorStatus status = ERROR; |
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180 | |||
181 | /* Check the SPI Instance SPIx*/ |
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182 | assert_param(IS_SPI_ALL_INSTANCE(SPIx)); |
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183 | |||
184 | /* Check the SPI parameters from SPI_InitStruct*/ |
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185 | assert_param(IS_LL_SPI_TRANSFER_DIRECTION(SPI_InitStruct->TransferDirection)); |
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186 | assert_param(IS_LL_SPI_MODE(SPI_InitStruct->Mode)); |
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187 | assert_param(IS_LL_SPI_DATAWIDTH(SPI_InitStruct->DataWidth)); |
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188 | assert_param(IS_LL_SPI_POLARITY(SPI_InitStruct->ClockPolarity)); |
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189 | assert_param(IS_LL_SPI_PHASE(SPI_InitStruct->ClockPhase)); |
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190 | assert_param(IS_LL_SPI_NSS(SPI_InitStruct->NSS)); |
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191 | assert_param(IS_LL_SPI_BAUDRATE(SPI_InitStruct->BaudRate)); |
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192 | assert_param(IS_LL_SPI_BITORDER(SPI_InitStruct->BitOrder)); |
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193 | assert_param(IS_LL_SPI_CRCCALCULATION(SPI_InitStruct->CRCCalculation)); |
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194 | |||
195 | if (LL_SPI_IsEnabled(SPIx) == 0x00000000U) |
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196 | { |
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197 | /*---------------------------- SPIx CR1 Configuration ------------------------ |
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198 | * Configure SPIx CR1 with parameters: |
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199 | * - TransferDirection: SPI_CR1_BIDIMODE, SPI_CR1_BIDIOE and SPI_CR1_RXONLY bits |
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200 | * - Master/Slave Mode: SPI_CR1_MSTR bit |
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201 | * - DataWidth: SPI_CR1_DFF bit |
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202 | * - ClockPolarity: SPI_CR1_CPOL bit |
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203 | * - ClockPhase: SPI_CR1_CPHA bit |
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204 | * - NSS management: SPI_CR1_SSM bit |
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205 | * - BaudRate prescaler: SPI_CR1_BR[2:0] bits |
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206 | * - BitOrder: SPI_CR1_LSBFIRST bit |
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207 | * - CRCCalculation: SPI_CR1_CRCEN bit |
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208 | */ |
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209 | MODIFY_REG(SPIx->CR1, |
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210 | SPI_CR1_CLEAR_MASK, |
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211 | SPI_InitStruct->TransferDirection | SPI_InitStruct->Mode | SPI_InitStruct->DataWidth | |
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212 | SPI_InitStruct->ClockPolarity | SPI_InitStruct->ClockPhase | |
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213 | SPI_InitStruct->NSS | SPI_InitStruct->BaudRate | |
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214 | SPI_InitStruct->BitOrder | SPI_InitStruct->CRCCalculation); |
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215 | |||
216 | /*---------------------------- SPIx CR2 Configuration ------------------------ |
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217 | * Configure SPIx CR2 with parameters: |
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218 | * - NSS management: SSOE bit |
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219 | */ |
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220 | MODIFY_REG(SPIx->CR2, SPI_CR2_SSOE, (SPI_InitStruct->NSS >> 16U)); |
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221 | |||
222 | /*---------------------------- SPIx CRCPR Configuration ---------------------- |
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223 | * Configure SPIx CRCPR with parameters: |
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224 | * - CRCPoly: CRCPOLY[15:0] bits |
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225 | */ |
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226 | if (SPI_InitStruct->CRCCalculation == LL_SPI_CRCCALCULATION_ENABLE) |
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227 | { |
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228 | assert_param(IS_LL_SPI_CRC_POLYNOMIAL(SPI_InitStruct->CRCPoly)); |
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229 | LL_SPI_SetCRCPolynomial(SPIx, SPI_InitStruct->CRCPoly); |
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230 | } |
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231 | status = SUCCESS; |
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232 | } |
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233 | |||
234 | #if defined (SPI_I2S_SUPPORT) |
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235 | /* Activate the SPI mode (Reset I2SMOD bit in I2SCFGR register) */ |
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236 | CLEAR_BIT(SPIx->I2SCFGR, SPI_I2SCFGR_I2SMOD); |
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237 | #endif /* SPI_I2S_SUPPORT */ |
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238 | return status; |
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239 | } |
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240 | |||
241 | /** |
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242 | * @brief Set each @ref LL_SPI_InitTypeDef field to default value. |
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243 | * @param SPI_InitStruct pointer to a @ref LL_SPI_InitTypeDef structure |
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244 | * whose fields will be set to default values. |
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245 | * @retval None |
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246 | */ |
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247 | void LL_SPI_StructInit(LL_SPI_InitTypeDef *SPI_InitStruct) |
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248 | { |
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249 | /* Set SPI_InitStruct fields to default values */ |
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250 | SPI_InitStruct->TransferDirection = LL_SPI_FULL_DUPLEX; |
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251 | SPI_InitStruct->Mode = LL_SPI_MODE_SLAVE; |
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252 | SPI_InitStruct->DataWidth = LL_SPI_DATAWIDTH_8BIT; |
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253 | SPI_InitStruct->ClockPolarity = LL_SPI_POLARITY_LOW; |
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254 | SPI_InitStruct->ClockPhase = LL_SPI_PHASE_1EDGE; |
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255 | SPI_InitStruct->NSS = LL_SPI_NSS_HARD_INPUT; |
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256 | SPI_InitStruct->BaudRate = LL_SPI_BAUDRATEPRESCALER_DIV2; |
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257 | SPI_InitStruct->BitOrder = LL_SPI_MSB_FIRST; |
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258 | SPI_InitStruct->CRCCalculation = LL_SPI_CRCCALCULATION_DISABLE; |
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259 | SPI_InitStruct->CRCPoly = 7U; |
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260 | } |
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261 | |||
262 | /** |
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263 | * @} |
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264 | */ |
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265 | |||
266 | /** |
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267 | * @} |
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268 | */ |
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269 | |||
270 | /** |
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271 | * @} |
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272 | */ |
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273 | |||
274 | #if defined(SPI_I2S_SUPPORT) |
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275 | /** @addtogroup I2S_LL |
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276 | * @{ |
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277 | */ |
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278 | |||
279 | /* Private types -------------------------------------------------------------*/ |
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280 | /* Private variables ---------------------------------------------------------*/ |
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281 | /* Private constants ---------------------------------------------------------*/ |
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282 | /** @defgroup I2S_LL_Private_Constants I2S Private Constants |
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283 | * @{ |
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284 | */ |
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285 | /* I2S registers Masks */ |
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286 | #define I2S_I2SCFGR_CLEAR_MASK (SPI_I2SCFGR_CHLEN | SPI_I2SCFGR_DATLEN | \ |
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287 | SPI_I2SCFGR_CKPOL | SPI_I2SCFGR_I2SSTD | \ |
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288 | SPI_I2SCFGR_I2SCFG | SPI_I2SCFGR_I2SMOD ) |
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289 | |||
290 | #define I2S_I2SPR_CLEAR_MASK 0x0002U |
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291 | /** |
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292 | * @} |
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293 | */ |
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294 | /* Private macros ------------------------------------------------------------*/ |
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295 | /** @defgroup I2S_LL_Private_Macros I2S Private Macros |
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296 | * @{ |
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297 | */ |
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298 | |||
299 | #define IS_LL_I2S_DATAFORMAT(__VALUE__) (((__VALUE__) == LL_I2S_DATAFORMAT_16B) \ |
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300 | || ((__VALUE__) == LL_I2S_DATAFORMAT_16B_EXTENDED) \ |
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301 | || ((__VALUE__) == LL_I2S_DATAFORMAT_24B) \ |
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302 | || ((__VALUE__) == LL_I2S_DATAFORMAT_32B)) |
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303 | |||
304 | #define IS_LL_I2S_CPOL(__VALUE__) (((__VALUE__) == LL_I2S_POLARITY_LOW) \ |
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305 | || ((__VALUE__) == LL_I2S_POLARITY_HIGH)) |
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306 | |||
307 | #define IS_LL_I2S_STANDARD(__VALUE__) (((__VALUE__) == LL_I2S_STANDARD_PHILIPS) \ |
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308 | || ((__VALUE__) == LL_I2S_STANDARD_MSB) \ |
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309 | || ((__VALUE__) == LL_I2S_STANDARD_LSB) \ |
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310 | || ((__VALUE__) == LL_I2S_STANDARD_PCM_SHORT) \ |
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311 | || ((__VALUE__) == LL_I2S_STANDARD_PCM_LONG)) |
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312 | |||
313 | #define IS_LL_I2S_MODE(__VALUE__) (((__VALUE__) == LL_I2S_MODE_SLAVE_TX) \ |
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314 | || ((__VALUE__) == LL_I2S_MODE_SLAVE_RX) \ |
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315 | || ((__VALUE__) == LL_I2S_MODE_MASTER_TX) \ |
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316 | || ((__VALUE__) == LL_I2S_MODE_MASTER_RX)) |
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317 | |||
318 | #define IS_LL_I2S_MCLK_OUTPUT(__VALUE__) (((__VALUE__) == LL_I2S_MCLK_OUTPUT_ENABLE) \ |
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319 | || ((__VALUE__) == LL_I2S_MCLK_OUTPUT_DISABLE)) |
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320 | |||
321 | #define IS_LL_I2S_AUDIO_FREQ(__VALUE__) ((((__VALUE__) >= LL_I2S_AUDIOFREQ_8K) \ |
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322 | && ((__VALUE__) <= LL_I2S_AUDIOFREQ_192K)) \ |
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323 | || ((__VALUE__) == LL_I2S_AUDIOFREQ_DEFAULT)) |
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324 | |||
325 | #define IS_LL_I2S_PRESCALER_LINEAR(__VALUE__) ((__VALUE__) >= 0x2U) |
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326 | |||
327 | #define IS_LL_I2S_PRESCALER_PARITY(__VALUE__) (((__VALUE__) == LL_I2S_PRESCALER_PARITY_EVEN) \ |
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328 | || ((__VALUE__) == LL_I2S_PRESCALER_PARITY_ODD)) |
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329 | /** |
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330 | * @} |
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331 | */ |
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332 | |||
333 | /* Private function prototypes -----------------------------------------------*/ |
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334 | |||
335 | /* Exported functions --------------------------------------------------------*/ |
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336 | /** @addtogroup I2S_LL_Exported_Functions |
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337 | * @{ |
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338 | */ |
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339 | |||
340 | /** @addtogroup I2S_LL_EF_Init |
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341 | * @{ |
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342 | */ |
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343 | |||
344 | /** |
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345 | * @brief De-initialize the SPI/I2S registers to their default reset values. |
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346 | * @param SPIx SPI Instance |
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347 | * @retval An ErrorStatus enumeration value: |
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348 | * - SUCCESS: SPI registers are de-initialized |
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349 | * - ERROR: SPI registers are not de-initialized |
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350 | */ |
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351 | ErrorStatus LL_I2S_DeInit(SPI_TypeDef *SPIx) |
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352 | { |
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353 | return LL_SPI_DeInit(SPIx); |
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354 | } |
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355 | |||
356 | /** |
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357 | * @brief Initializes the SPI/I2S registers according to the specified parameters in I2S_InitStruct. |
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358 | * @note As some bits in SPI configuration registers can only be written when the SPI is disabled (SPI_CR1_SPE bit =0), |
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359 | * SPI peripheral should be in disabled state prior calling this function. Otherwise, ERROR result will be returned. |
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360 | * @param SPIx SPI Instance |
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361 | * @param I2S_InitStruct pointer to a @ref LL_I2S_InitTypeDef structure |
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362 | * @retval An ErrorStatus enumeration value: |
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363 | * - SUCCESS: SPI registers are Initialized |
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364 | * - ERROR: SPI registers are not Initialized |
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365 | */ |
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366 | ErrorStatus LL_I2S_Init(SPI_TypeDef *SPIx, LL_I2S_InitTypeDef *I2S_InitStruct) |
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367 | { |
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368 | uint32_t i2sdiv = 2U; |
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369 | uint32_t i2sodd = 0U; |
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370 | uint32_t packetlength = 1U; |
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371 | uint32_t tmp; |
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372 | LL_RCC_ClocksTypeDef rcc_clocks; |
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373 | uint32_t sourceclock; |
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374 | ErrorStatus status = ERROR; |
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375 | |||
376 | /* Check the I2S parameters */ |
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377 | assert_param(IS_I2S_ALL_INSTANCE(SPIx)); |
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378 | assert_param(IS_LL_I2S_MODE(I2S_InitStruct->Mode)); |
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379 | assert_param(IS_LL_I2S_STANDARD(I2S_InitStruct->Standard)); |
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380 | assert_param(IS_LL_I2S_DATAFORMAT(I2S_InitStruct->DataFormat)); |
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381 | assert_param(IS_LL_I2S_MCLK_OUTPUT(I2S_InitStruct->MCLKOutput)); |
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382 | assert_param(IS_LL_I2S_AUDIO_FREQ(I2S_InitStruct->AudioFreq)); |
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383 | assert_param(IS_LL_I2S_CPOL(I2S_InitStruct->ClockPolarity)); |
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384 | |||
385 | if (LL_I2S_IsEnabled(SPIx) == 0x00000000U) |
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386 | { |
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387 | /*---------------------------- SPIx I2SCFGR Configuration -------------------- |
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388 | * Configure SPIx I2SCFGR with parameters: |
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389 | * - Mode: SPI_I2SCFGR_I2SCFG[1:0] bit |
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390 | * - Standard: SPI_I2SCFGR_I2SSTD[1:0] and SPI_I2SCFGR_PCMSYNC bits |
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391 | * - DataFormat: SPI_I2SCFGR_CHLEN and SPI_I2SCFGR_DATLEN bits |
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392 | * - ClockPolarity: SPI_I2SCFGR_CKPOL bit |
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393 | */ |
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394 | |||
395 | /* Write to SPIx I2SCFGR */ |
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396 | MODIFY_REG(SPIx->I2SCFGR, |
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397 | I2S_I2SCFGR_CLEAR_MASK, |
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398 | I2S_InitStruct->Mode | I2S_InitStruct->Standard | |
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399 | I2S_InitStruct->DataFormat | I2S_InitStruct->ClockPolarity | |
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400 | SPI_I2SCFGR_I2SMOD); |
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401 | |||
402 | /*---------------------------- SPIx I2SPR Configuration ---------------------- |
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403 | * Configure SPIx I2SPR with parameters: |
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404 | * - MCLKOutput: SPI_I2SPR_MCKOE bit |
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405 | * - AudioFreq: SPI_I2SPR_I2SDIV[7:0] and SPI_I2SPR_ODD bits |
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406 | */ |
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407 | |||
408 | /* If the requested audio frequency is not the default, compute the prescaler (i2sodd, i2sdiv) |
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409 | * else, default values are used: i2sodd = 0U, i2sdiv = 2U. |
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410 | */ |
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411 | if (I2S_InitStruct->AudioFreq != LL_I2S_AUDIOFREQ_DEFAULT) |
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412 | { |
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413 | /* Check the frame length (For the Prescaler computing) |
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414 | * Default value: LL_I2S_DATAFORMAT_16B (packetlength = 1U). |
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415 | */ |
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416 | if (I2S_InitStruct->DataFormat != LL_I2S_DATAFORMAT_16B) |
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417 | { |
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418 | /* Packet length is 32 bits */ |
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419 | packetlength = 2U; |
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420 | } |
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421 | |||
422 | /* I2S Clock source is System clock: Get System Clock frequency */ |
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423 | LL_RCC_GetSystemClocksFreq(&rcc_clocks); |
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424 | |||
425 | /* Get the source clock value: based on System Clock value */ |
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426 | sourceclock = rcc_clocks.SYSCLK_Frequency; |
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427 | |||
428 | /* Compute the Real divider depending on the MCLK output state with a floating point */ |
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429 | if (I2S_InitStruct->MCLKOutput == LL_I2S_MCLK_OUTPUT_ENABLE) |
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430 | { |
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431 | /* MCLK output is enabled */ |
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432 | tmp = (((((sourceclock / 256U) * 10U) / I2S_InitStruct->AudioFreq)) + 5U); |
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433 | } |
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434 | else |
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435 | { |
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436 | /* MCLK output is disabled */ |
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437 | tmp = (((((sourceclock / (32U * packetlength)) * 10U) / I2S_InitStruct->AudioFreq)) + 5U); |
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438 | } |
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439 | |||
440 | /* Remove the floating point */ |
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441 | tmp = tmp / 10U; |
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442 | |||
443 | /* Check the parity of the divider */ |
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444 | i2sodd = (tmp & (uint16_t)0x0001U); |
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445 | |||
446 | /* Compute the i2sdiv prescaler */ |
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447 | i2sdiv = ((tmp - i2sodd) / 2U); |
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448 | |||
449 | /* Get the Mask for the Odd bit (SPI_I2SPR[8]) register */ |
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450 | i2sodd = (i2sodd << 8U); |
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451 | } |
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452 | |||
453 | /* Test if the divider is 1 or 0 or greater than 0xFF */ |
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454 | if ((i2sdiv < 2U) || (i2sdiv > 0xFFU)) |
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455 | { |
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456 | /* Set the default values */ |
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457 | i2sdiv = 2U; |
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458 | i2sodd = 0U; |
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459 | } |
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460 | |||
461 | /* Write to SPIx I2SPR register the computed value */ |
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462 | WRITE_REG(SPIx->I2SPR, i2sdiv | i2sodd | I2S_InitStruct->MCLKOutput); |
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463 | |||
464 | status = SUCCESS; |
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465 | } |
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466 | return status; |
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467 | } |
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468 | |||
469 | /** |
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470 | * @brief Set each @ref LL_I2S_InitTypeDef field to default value. |
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471 | * @param I2S_InitStruct pointer to a @ref LL_I2S_InitTypeDef structure |
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472 | * whose fields will be set to default values. |
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473 | * @retval None |
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474 | */ |
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475 | void LL_I2S_StructInit(LL_I2S_InitTypeDef *I2S_InitStruct) |
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476 | { |
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477 | /*--------------- Reset I2S init structure parameters values -----------------*/ |
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478 | I2S_InitStruct->Mode = LL_I2S_MODE_SLAVE_TX; |
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479 | I2S_InitStruct->Standard = LL_I2S_STANDARD_PHILIPS; |
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480 | I2S_InitStruct->DataFormat = LL_I2S_DATAFORMAT_16B; |
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481 | I2S_InitStruct->MCLKOutput = LL_I2S_MCLK_OUTPUT_DISABLE; |
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482 | I2S_InitStruct->AudioFreq = LL_I2S_AUDIOFREQ_DEFAULT; |
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483 | I2S_InitStruct->ClockPolarity = LL_I2S_POLARITY_LOW; |
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484 | } |
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485 | |||
486 | /** |
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487 | * @brief Set linear and parity prescaler. |
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488 | * @note To calculate value of PrescalerLinear(I2SDIV[7:0] bits) and PrescalerParity(ODD bit)\n |
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489 | * Check Audio frequency table and formulas inside Reference Manual (SPI/I2S). |
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490 | * @param SPIx SPI Instance |
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491 | * @param PrescalerLinear value Min_Data=0x02 and Max_Data=0xFF. |
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492 | * @param PrescalerParity This parameter can be one of the following values: |
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493 | * @arg @ref LL_I2S_PRESCALER_PARITY_EVEN |
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494 | * @arg @ref LL_I2S_PRESCALER_PARITY_ODD |
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495 | * @retval None |
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496 | */ |
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497 | void LL_I2S_ConfigPrescaler(SPI_TypeDef *SPIx, uint32_t PrescalerLinear, uint32_t PrescalerParity) |
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498 | { |
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499 | /* Check the I2S parameters */ |
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500 | assert_param(IS_I2S_ALL_INSTANCE(SPIx)); |
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501 | assert_param(IS_LL_I2S_PRESCALER_LINEAR(PrescalerLinear)); |
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502 | assert_param(IS_LL_I2S_PRESCALER_PARITY(PrescalerParity)); |
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503 | |||
504 | /* Write to SPIx I2SPR */ |
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505 | MODIFY_REG(SPIx->I2SPR, SPI_I2SPR_I2SDIV | SPI_I2SPR_ODD, PrescalerLinear | (PrescalerParity << 8U)); |
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506 | } |
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507 | |||
508 | /** |
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509 | * @} |
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510 | */ |
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511 | |||
512 | /** |
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513 | * @} |
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514 | */ |
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515 | |||
516 | /** |
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517 | * @} |
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518 | */ |
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519 | #endif /* SPI_I2S_SUPPORT */ |
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520 | |||
521 | #endif /* defined (SPI1) || defined (SPI2) || defined (SPI3) */ |
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522 | |||
523 | /** |
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524 | * @} |
||
525 | */ |
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526 | |||
527 | #endif /* USE_FULL_LL_DRIVER */ |
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528 |