1 | #include <stdint.h>
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2 | #include "stm32f10x_i2c.h"
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3 | #include "stm32f10x_rcc.h"
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4 | #include "stm32f10x_gpio.h"
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5 | #include "misc.h"
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6 | #include "i2c.h"
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7 |
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8 |
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9 | volatile uint8_t deviceAddress = 0;
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10 | volatile uint8_t dataByte1 = 0;
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11 | volatile uint8_t dataByte0 = 0;
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12 | volatile uint8_t receivedDataByte1 = 0;
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13 | volatile uint8_t receivedDataByte0 = 0;
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14 | volatile uint8_t i2cDirectionWrite = 1;
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15 | volatile uint8_t i2cByteCounter = 0;
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16 | volatile uint8_t i2cBusyFlag = 0;
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17 |
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18 | volatile uint8_t test = 1;
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19 |
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20 | volatile uint8_t temp = 1;
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21 |
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22 |
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23 | void i2c_init(void)
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24 | {
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25 | GPIO_InitTypeDef GPIO_InitStructure;
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26 | NVIC_InitTypeDef NVIC_InitStructure;
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27 | I2C_InitTypeDef I2C_InitStructure;
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28 |
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29 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
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30 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
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31 |
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32 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
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33 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
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34 | GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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35 | GPIO_Init(GPIOB, &GPIO_InitStructure);
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36 |
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37 | NVIC_InitStructure.NVIC_IRQChannel = I2C1_EV_IRQn;
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38 | NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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39 | NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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40 | NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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41 | NVIC_Init(&NVIC_InitStructure);
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42 |
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43 | NVIC_InitStructure.NVIC_IRQChannel = I2C1_ER_IRQn;
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44 | NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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45 | NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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46 | NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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47 | NVIC_Init(&NVIC_InitStructure);
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48 |
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49 | I2C_DeInit(I2C1);
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50 |
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51 | I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
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52 | I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
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53 | I2C_InitStructure.I2C_ClockSpeed = 100000;
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54 | I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
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55 | I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
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56 | I2C_InitStructure.I2C_OwnAddress1 = 0;
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57 | I2C_Init(I2C1, &I2C_InitStructure);
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58 |
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59 | I2C_ITConfig(I2C1, I2C_IT_EVT, ENABLE);
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60 | I2C_ITConfig(I2C1, I2C_IT_BUF, ENABLE);
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61 | I2C_ITConfig(I2C1, I2C_IT_ERR, ENABLE);
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62 |
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63 | I2C_Cmd(I2C1, ENABLE);
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64 |
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65 | i2cBusyFlag = 0;
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66 | }
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67 |
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68 | void i2c_writeByte(uint8_t address, uint8_t byte){
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69 | while(i2cBusyFlag){}
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70 | while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY)){}
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71 | deviceAddress = address;
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72 | dataByte0 = byte;
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73 | i2cDirectionWrite = 1;
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74 | i2cBusyFlag = 1;
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75 | i2cByteCounter = 1;
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76 | I2C_GenerateSTART(I2C1, ENABLE);
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77 | }
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78 |
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79 | // ISR
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80 | void I2C1_EV_IRQHandler(void)
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81 | {
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82 |
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83 | if(I2C_GetFlagStatus(I2C1, I2C_FLAG_SB) == SET)
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84 | {
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85 | if(i2cDirectionWrite)
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86 | {
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87 | // STM32 Transmitter
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88 | I2C_Send7bitAddress(I2C1, deviceAddress, I2C_Direction_Transmitter);
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89 | }
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90 | else
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91 | {
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92 | // STM32 Receiver
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93 | I2C_Send7bitAddress(I2C1, deviceAddress, I2C_Direction_Receiver);
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94 | }
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95 | }
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96 | else if(I2C_GetFlagStatus(I2C1, I2C_FLAG_ADDR) == SET || I2C_GetFlagStatus(I2C1, I2C_FLAG_BTF) == SET){
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97 | I2C_ReadRegister(I2C1, I2C_Register_SR1);
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98 | I2C_ReadRegister(I2C1, I2C_Register_SR2);
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99 |
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100 | if(1) // hier soll eigentlich if(i2cDirectionWrite) stehen, geht nur nicht
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101 | {
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102 |
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103 | // STM32 Transmitter
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104 | if(i2cByteCounter == 2)
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105 | {
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106 | I2C_SendData(I2C1, dataByte1);
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107 | i2cByteCounter--;
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108 | }
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109 | else if(i2cByteCounter == 1)
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110 | {
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111 | I2C_SendData(I2C1, dataByte0);
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112 | i2cByteCounter--;
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113 | }
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114 | else
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115 | {
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116 | I2C_GenerateSTOP(I2C1, ENABLE);
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117 | i2cBusyFlag = 0;
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118 | }
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119 | }
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120 | }
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121 | }
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122 |
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123 | // ISR
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124 | void I2C1_ER_IRQHandler(void)
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125 | {
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126 | I2C_GenerateSTOP(I2C1, ENABLE);
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127 | i2cBusyFlag = 0;
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128 |
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129 | I2C_ClearFlag(I2C1, I2C_FLAG_AF);
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130 | I2C_ClearFlag(I2C1, I2C_FLAG_ARLO);
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131 | I2C_ClearFlag(I2C1, I2C_FLAG_BERR);
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132 | }
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