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| Rev | Author | Line No. | Line |
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| 2 | mjames | 1 | /** |
| 2 | ****************************************************************************** |
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| 3 | * @file stm32f1xx_ll_i2c.c |
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| 4 | * @author MCD Application Team |
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| 5 | * @brief I2C LL module driver. |
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| 6 | ****************************************************************************** |
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| 7 | * @attention |
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| 8 | * |
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| 9 | * <h2><center>© Copyright (c) 2016 STMicroelectronics. |
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| 10 | * All rights reserved.</center></h2> |
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| 11 | * |
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| 12 | * This software component is licensed by ST under BSD 3-Clause license, |
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| 13 | * the "License"; You may not use this file except in compliance with the |
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| 14 | * License. You may obtain a copy of the License at: |
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| 15 | * opensource.org/licenses/BSD-3-Clause |
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| 16 | * |
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| 17 | ****************************************************************************** |
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| 18 | */ |
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| 19 | #if defined(USE_FULL_LL_DRIVER) |
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| 20 | |||
| 21 | /* Includes ------------------------------------------------------------------*/ |
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| 22 | #include "stm32f1xx_ll_i2c.h" |
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| 23 | #include "stm32f1xx_ll_bus.h" |
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| 24 | #include "stm32f1xx_ll_rcc.h" |
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| 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 |
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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 (I2C1) || defined (I2C2) |
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| 36 | |||
| 37 | /** @defgroup I2C_LL I2C |
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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 | /* Private constants ---------------------------------------------------------*/ |
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| 44 | /* Private macros ------------------------------------------------------------*/ |
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| 45 | /** @addtogroup I2C_LL_Private_Macros |
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| 46 | * @{ |
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| 47 | */ |
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| 48 | |||
| 49 | #define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__) (((__VALUE__) == LL_I2C_MODE_I2C) || \ |
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| 50 | ((__VALUE__) == LL_I2C_MODE_SMBUS_HOST) || \ |
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| 51 | ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \ |
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| 52 | ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP)) |
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| 53 | |||
| 54 | #define IS_LL_I2C_CLOCK_SPEED(__VALUE__) (((__VALUE__) > 0U) && ((__VALUE__) <= LL_I2C_MAX_SPEED_FAST)) |
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| 55 | |||
| 56 | #define IS_LL_I2C_DUTY_CYCLE(__VALUE__) (((__VALUE__) == LL_I2C_DUTYCYCLE_2) || \ |
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| 57 | ((__VALUE__) == LL_I2C_DUTYCYCLE_16_9)) |
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| 58 | |||
| 59 | #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__) ((__VALUE__) <= 0x000003FFU) |
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| 60 | |||
| 61 | #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__) (((__VALUE__) == LL_I2C_ACK) || \ |
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| 62 | ((__VALUE__) == LL_I2C_NACK)) |
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| 63 | |||
| 64 | #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__) (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \ |
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| 65 | ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT)) |
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| 66 | /** |
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| 67 | * @} |
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| 68 | */ |
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| 69 | |||
| 70 | /* Private function prototypes -----------------------------------------------*/ |
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| 71 | |||
| 72 | /* Exported functions --------------------------------------------------------*/ |
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| 73 | /** @addtogroup I2C_LL_Exported_Functions |
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| 74 | * @{ |
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| 75 | */ |
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| 76 | |||
| 77 | /** @addtogroup I2C_LL_EF_Init |
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| 78 | * @{ |
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| 79 | */ |
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| 80 | |||
| 81 | /** |
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| 82 | * @brief De-initialize the I2C registers to their default reset values. |
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| 83 | * @param I2Cx I2C Instance. |
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| 84 | * @retval An ErrorStatus enumeration value: |
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| 85 | * - SUCCESS I2C registers are de-initialized |
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| 86 | * - ERROR I2C registers are not de-initialized |
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| 87 | */ |
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| 88 | uint32_t LL_I2C_DeInit(I2C_TypeDef *I2Cx) |
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| 89 | { |
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| 90 | ErrorStatus status = SUCCESS; |
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| 91 | |||
| 92 | /* Check the I2C Instance I2Cx */ |
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| 93 | assert_param(IS_I2C_ALL_INSTANCE(I2Cx)); |
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| 94 | |||
| 95 | if (I2Cx == I2C1) |
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| 96 | { |
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| 97 | /* Force reset of I2C clock */ |
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| 98 | LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1); |
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| 99 | |||
| 100 | /* Release reset of I2C clock */ |
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| 101 | LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1); |
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| 102 | } |
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| 103 | #if defined(I2C2) |
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| 104 | else if (I2Cx == I2C2) |
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| 105 | { |
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| 106 | /* Force reset of I2C clock */ |
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| 107 | LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2); |
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| 108 | |||
| 109 | /* Release reset of I2C clock */ |
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| 110 | LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2); |
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| 111 | |||
| 112 | } |
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| 113 | #endif /* I2C2 */ |
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| 114 | else |
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| 115 | { |
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| 116 | status = ERROR; |
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| 117 | } |
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| 118 | |||
| 119 | return status; |
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| 120 | } |
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| 121 | |||
| 122 | /** |
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| 123 | * @brief Initialize the I2C registers according to the specified parameters in I2C_InitStruct. |
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| 124 | * @param I2Cx I2C Instance. |
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| 125 | * @param I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure. |
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| 126 | * @retval An ErrorStatus enumeration value: |
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| 127 | * - SUCCESS I2C registers are initialized |
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| 128 | * - ERROR Not applicable |
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| 129 | */ |
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| 130 | uint32_t LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct) |
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| 131 | { |
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| 132 | LL_RCC_ClocksTypeDef rcc_clocks; |
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| 133 | |||
| 134 | /* Check the I2C Instance I2Cx */ |
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| 135 | assert_param(IS_I2C_ALL_INSTANCE(I2Cx)); |
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| 136 | |||
| 137 | /* Check the I2C parameters from I2C_InitStruct */ |
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| 138 | assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode)); |
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| 139 | assert_param(IS_LL_I2C_CLOCK_SPEED(I2C_InitStruct->ClockSpeed)); |
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| 140 | assert_param(IS_LL_I2C_DUTY_CYCLE(I2C_InitStruct->DutyCycle)); |
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| 141 | assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1)); |
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| 142 | assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge)); |
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| 143 | assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize)); |
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| 144 | |||
| 145 | /* Disable the selected I2Cx Peripheral */ |
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| 146 | LL_I2C_Disable(I2Cx); |
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| 147 | |||
| 148 | /* Retrieve Clock frequencies */ |
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| 149 | LL_RCC_GetSystemClocksFreq(&rcc_clocks); |
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| 150 | |||
| 151 | /*---------------------------- I2Cx SCL Clock Speed Configuration ------------ |
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| 152 | * Configure the SCL speed : |
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| 153 | * - ClockSpeed: I2C_CR2_FREQ[5:0], I2C_TRISE_TRISE[5:0], I2C_CCR_FS, |
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| 154 | * and I2C_CCR_CCR[11:0] bits |
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| 155 | * - DutyCycle: I2C_CCR_DUTY[7:0] bits |
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| 156 | */ |
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| 157 | LL_I2C_ConfigSpeed(I2Cx, rcc_clocks.PCLK1_Frequency, I2C_InitStruct->ClockSpeed, I2C_InitStruct->DutyCycle); |
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| 158 | |||
| 159 | /*---------------------------- I2Cx OAR1 Configuration ----------------------- |
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| 160 | * Disable, Configure and Enable I2Cx device own address 1 with parameters : |
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| 161 | * - OwnAddress1: I2C_OAR1_ADD[9:8], I2C_OAR1_ADD[7:1] and I2C_OAR1_ADD0 bits |
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| 162 | * - OwnAddrSize: I2C_OAR1_ADDMODE bit |
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| 163 | */ |
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| 164 | LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize); |
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| 165 | |||
| 166 | /*---------------------------- I2Cx MODE Configuration ----------------------- |
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| 167 | * Configure I2Cx peripheral mode with parameter : |
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| 168 | * - PeripheralMode: I2C_CR1_SMBUS, I2C_CR1_SMBTYPE and I2C_CR1_ENARP bits |
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| 169 | */ |
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| 170 | LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode); |
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| 171 | |||
| 172 | /* Enable the selected I2Cx Peripheral */ |
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| 173 | LL_I2C_Enable(I2Cx); |
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| 174 | |||
| 175 | /*---------------------------- I2Cx CR2 Configuration ------------------------ |
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| 176 | * Configure the ACKnowledge or Non ACKnowledge condition |
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| 177 | * after the address receive match code or next received byte with parameter : |
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| 178 | * - TypeAcknowledge: I2C_CR2_NACK bit |
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| 179 | */ |
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| 180 | LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge); |
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| 181 | |||
| 182 | return SUCCESS; |
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| 183 | } |
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| 184 | |||
| 185 | /** |
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| 186 | * @brief Set each @ref LL_I2C_InitTypeDef field to default value. |
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| 187 | * @param I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure. |
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| 188 | * @retval None |
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| 189 | */ |
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| 190 | void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct) |
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| 191 | { |
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| 192 | /* Set I2C_InitStruct fields to default values */ |
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| 193 | I2C_InitStruct->PeripheralMode = LL_I2C_MODE_I2C; |
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| 194 | I2C_InitStruct->ClockSpeed = 5000U; |
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| 195 | I2C_InitStruct->DutyCycle = LL_I2C_DUTYCYCLE_2; |
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| 196 | I2C_InitStruct->OwnAddress1 = 0U; |
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| 197 | I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK; |
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| 198 | I2C_InitStruct->OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT; |
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| 199 | } |
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| 200 | |||
| 201 | /** |
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| 202 | * @} |
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| 203 | */ |
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| 204 | |||
| 205 | /** |
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| 206 | * @} |
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| 207 | */ |
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| 208 | |||
| 209 | /** |
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| 210 | * @} |
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| 211 | */ |
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| 212 | |||
| 213 | #endif /* I2C1 || I2C2 */ |
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| 214 | |||
| 215 | /** |
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| 216 | * @} |
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| 217 | */ |
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| 218 | |||
| 219 | #endif /* USE_FULL_LL_DRIVER */ |
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| 220 | |||
| 221 | /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |