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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | mjames | 1 | #include "libCharLCD/lcdInterface.h" |
| 2 | |||
| 3 | /// \brief Initialise : call after ChibiOS is running . |
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| 4 | void lcdInterface_t::init() |
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| 5 | { |
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| 6 | } |
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| 7 | |||
| 8 | void lcdInterface_t::setLineMode(ioline_t line, unsigned mode) |
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| 9 | { |
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| 10 | GPIO_InitTypeDef GPIO_InitStruct; |
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| 11 | GPIO_InitStruct.Pin = line.pin; |
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| 12 | GPIO_InitStruct.Mode = mode; |
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| 13 | GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; |
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| 14 | GPIO_InitStruct.Pull = GPIO_PULLUP; |
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| 15 | HAL_GPIO_Init(line.gpio, &GPIO_InitStruct); |
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| 16 | } |
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| 17 | |||
| 18 | void lcdInterface_t::polledDelay(unsigned microsec) |
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| 19 | { |
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| 20 | |||
| 21 | uint16_t tval = __HAL_TIM_GET_COUNTER(LCD_DELAY_CNT); |
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| 22 | |||
| 23 | // need to determine timer is "after" |
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| 24 | |||
| 25 | while ((__HAL_TIM_GET_COUNTER(LCD_DELAY_CNT) - tval) < microsec) |
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| 26 | { |
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| 27 | }; |
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| 28 | }; |
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| 29 | |||
| 30 | void lcdInterface_t::writeData4(uint8_t data_) |
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| 31 | { |
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| 32 | // set write bit to low = write |
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| 33 | HAL_GPIO_WritePin(m_wrBit.gpio, m_wrBit.pin, GPIO_PIN_RESET); |
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| 34 | |||
| 35 | for (int i = 0; i < 4; i++) |
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| 36 | setLineMode(m_dBits[i], GPIO_MODE_OUTPUT_PP); |
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| 37 | |||
| 38 | for (int i = 0; i < 4; i++) |
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| 39 | HAL_GPIO_WritePin(m_dBits[i].gpio, m_dBits[i].pin, (data_ & (1 << i)) ? GPIO_PIN_SET : GPIO_PIN_RESET); |
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| 40 | |||
| 41 | polledDelay(2); |
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| 42 | // pulse enable line high |
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| 43 | HAL_GPIO_WritePin(m_eBit.gpio, m_eBit.pin, GPIO_PIN_SET); |
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| 44 | polledDelay(2); |
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| 45 | HAL_GPIO_WritePin(m_eBit.gpio, m_eBit.pin, GPIO_PIN_RESET); |
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| 46 | } |
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| 47 | void lcdInterface_t::writeData8(uint8_t data_) |
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| 48 | { |
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| 49 | writeData4((data_ & 0xF0) >> 4); |
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| 50 | writeData4(data_ & 0x0F); |
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| 51 | } |
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| 52 | |||
| 53 | uint8_t lcdInterface_t::readData4() |
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| 54 | { |
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| 55 | // clear write bit to high = read |
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| 56 | HAL_GPIO_WritePin(m_wrBit.gpio, m_wrBit.pin, GPIO_PIN_SET); |
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| 57 | for (int i = 0; i < 4; i++) |
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| 58 | setLineMode(m_dBits[i], GPIO_MODE_INPUT); |
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| 59 | HAL_GPIO_WritePin(m_eBit.gpio, m_eBit.pin, GPIO_PIN_SET); |
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| 60 | polledDelay(2); |
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| 61 | uint8_t dat = 0; |
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| 62 | for (int i = 0; i < 4; i++) |
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| 63 | { |
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| 64 | if (HAL_GPIO_ReadPin(m_dBits[i].gpio, m_dBits[i].pin) == GPIO_PIN_SET) |
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| 65 | dat |= 1 << i; |
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| 66 | } |
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| 67 | HAL_GPIO_WritePin(m_eBit.gpio, m_eBit.pin, GPIO_PIN_RESET); |
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| 68 | return dat; |
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| 69 | } |
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| 70 | |||
| 71 | uint8_t lcdInterface_t::readData8() |
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| 72 | { |
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| 73 | uint8_t dat = readData4() << 4; |
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| 74 | dat |= readData4(); |
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| 75 | return dat; |
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| 76 | } |
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| 77 | |||
| 78 | /// \brief Return the X size of this display |
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| 79 | uint8_t lcdInterface_t::displayXsize() const |
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| 80 | { |
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| 81 | switch (m_lcdType) |
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| 82 | { |
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| 83 | case LCD_8X1: |
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| 84 | case LCD_8X2: |
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| 85 | return 8; |
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| 86 | case LCD_10X1: |
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| 87 | case LCD_10X2: |
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| 88 | return 10; |
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| 89 | case LCD_16X1: |
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| 90 | case LCD_16X2: |
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| 91 | return 16; |
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| 92 | case LCD_20X1: |
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| 93 | case LCD_20X2: |
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| 94 | return 20; |
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| 95 | case LCD_40X1: |
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| 96 | case LCD_40X2: |
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| 97 | return 40; |
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| 98 | } |
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| 99 | return 0; |
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| 100 | } |
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| 101 | |||
| 102 | /// \brief Return the Y size (1 or 2) of this display |
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| 103 | uint8_t lcdInterface_t::displayYsize() const |
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| 104 | { |
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| 105 | switch (m_lcdType) |
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| 106 | { |
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| 107 | case LCD_8X1: |
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| 108 | case LCD_10X1: |
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| 109 | case LCD_16X1: |
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| 110 | case LCD_20X1: |
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| 111 | case LCD_40X1: |
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| 112 | return 1; |
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| 113 | case LCD_8X2: |
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| 114 | case LCD_10X2: |
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| 115 | case LCD_16X2: |
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| 116 | case LCD_20X2: |
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| 117 | case LCD_40X2: |
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| 118 | return 2; |
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| 119 | } |
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| 120 | return 0; |
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| 121 | } |
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| 122 | |||
| 123 | void lcdInterface_t::writeData(uint8_t data_) |
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| 124 | { |
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| 125 | HAL_GPIO_WritePin(m_rsBit.gpio, m_rsBit.pin, GPIO_PIN_SET); |
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| 126 | writeData8(data_); |
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| 127 | pollBusy(); |
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| 128 | } |
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| 129 | |||
| 130 | void lcdInterface_t::writeCtrl(uint8_t data_) |
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| 131 | { |
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| 132 | HAL_GPIO_WritePin(m_rsBit.gpio, m_rsBit.pin, GPIO_PIN_RESET); |
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| 133 | writeData8(data_); |
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| 134 | } |
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| 135 | |||
| 136 | void lcdInterface_t::writeCtrl4(uint8_t data_) |
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| 137 | { |
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| 138 | HAL_GPIO_WritePin(m_rsBit.gpio, m_rsBit.pin, GPIO_PIN_RESET); |
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| 139 | writeData4(data_ >> 4); |
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| 140 | } |
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| 141 | |||
| 142 | void lcdInterface_t::pollBusy() |
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| 143 | { |
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| 144 | // read from the status bit |
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| 145 | HAL_GPIO_WritePin(m_rsBit.gpio, m_rsBit.pin, GPIO_PIN_RESET); |
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| 146 | // limit to a certain number of loops |
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| 147 | int tries = 1000; |
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| 148 | while (--tries) |
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| 149 | { |
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| 150 | if ((readData8() & 0x80) == 0) |
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| 151 | return; |
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| 152 | } |
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| 153 | m_timeouts++; |
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| 154 | // fall out as it failed . |
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| 155 | } |
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| 156 | |||
| 157 | void lcdInterface_t::writeCtrlWait(uint8_t data_) |
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| 158 | { |
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| 159 | writeCtrl(data_); |
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| 160 | pollBusy(); |
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| 161 | } |
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| 162 | |||
| 163 | uint8_t lcdInterface_t::readData() |
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| 164 | { |
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| 165 | HAL_GPIO_WritePin(m_rsBit.gpio, m_rsBit.pin, GPIO_PIN_SET); |
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| 166 | return readData8(); |
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| 167 | } |
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| 168 | |||
| 169 | uint8_t lcdInterface_t::readCtrl() |
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| 170 | { |
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| 171 | HAL_GPIO_WritePin(m_rsBit.gpio, m_rsBit.pin, GPIO_PIN_RESET); |
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| 172 | return readData8(); |
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| 173 | } |
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| 174 | |||
| 175 | void lcdInterface_t::pulseE() |
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| 176 | { |
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| 177 | // pulse enable line high |
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| 178 | polledDelay(2); |
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| 179 | HAL_GPIO_WritePin(m_eBit.gpio, m_eBit.pin, GPIO_PIN_SET); |
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| 180 | polledDelay(2); |
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| 181 | HAL_GPIO_WritePin(m_eBit.gpio, m_eBit.pin, GPIO_PIN_RESET); |
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| 182 | } |