STM32F0系列单片机I2C驱动程序

#include <cfg_hw_i2c.h> #include <hw_i2c.h> #define ACK 0 #define NAK 1 void I2C_NopDelay(uint16_t delay) { int16_t i = delay; while(--i > 0); } #if (CFG_HW_I2C1_ENABLE) && (CFG_HW_I2C1_HARD) static void HW_I2C1_GPIO_Init(void) { #if defined(USE_STDPERIPH_DRIVER) GPIO_InitTypeDef GPIO_InitStruct; //复用上拉 GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_Pin = I2C1_SCK_PIN | I2C1_SDA_PIN; GPIO_Init(I2C1_IO, &GPIO_InitStruct); GPIO_PinAFConfig(I2C1_IO, I2C1_SCK_SOURCE, I2C1_AF); GPIO_PinAFConfig(I2C1_IO, I2C1_SDA_SOURCE, I2C1_AF); #elif defined(USE_FULL_LL_DRIVER) LL_GPIO_InitTypeDef GPIO_InitStruct; GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE; GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL; GPIO_InitStruct.Pull = LL_GPIO_PULL_NO; GPIO_InitStruct.Speed = LL_GPIO_SPEED_HIGH; GPIO_InitStruct.Pin = I2C1_SCK_PIN | I2C1_SDA_PIN; GPIO_InitStruct.Alternate = I2C1_AF; LL_GPIO_Init(I2C1_IO, &GPIO_InitStruct); #endif } static void HW_I2C1_I2C_Init(void) { #if defined(USE_STDPERIPH_DRIVER) I2C_InitTypeDef I2C_InitStruct; I2C_DeInit(I2C1); /*---------------- Reset I2C init structure parameters values --------------*/ I2C_InitStruct.I2C_Timing = 0x40B22536;//100K // I2C_InitStruct.I2C_Timing = 0x2000090E;// // I2C_InitStruct.I2C_Timing = 0x10950C27;//400K I2C_InitStruct.I2C_AnalogFilter = I2C_AnalogFilter_Enable; I2C_InitStruct.I2C_DigitalFilter = 0x01; I2C_InitStruct.I2C_Mode = I2C_Mode_I2C; I2C_InitStruct.I2C_OwnAddress1 = 0x00; I2C_InitStruct.I2C_Ack = I2C_Ack_Enable; I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; I2C_Init(I2C1, &I2C_InitStruct); #elif defined(USE_FULL_LL_DRIVER) LL_I2C_InitTypeDef I2C_InitStruct; LL_I2C_DeInit(I2C1); /* Set I2C_InitStruct fields to default values */ I2C_InitStruct.PeripheralMode = LL_I2C_MODE_I2C; I2C_InitStruct.Timing = 0x40B22536;//100K // I2C_InitStruct.Timing = 0x2000090E; // I2C_InitStruct.Timing = 0x10950C27;//400K I2C_InitStruct.AnalogFilter = LL_I2C_ANALOGFILTER_ENABLE; I2C_InitStruct.DigitalFilter = 0x01; I2C_InitStruct.OwnAddress1 = 0x00; I2C_InitStruct.TypeAcknowledge = LL_I2C_ACK; I2C_InitStruct.OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT; LL_I2C_Init(I2C1, &I2C_InitStruct); #endif } void HW_I2C1_Init(void) { // If I2C1 has been initialized, it doesn't have to be initialized again #if defined(USE_STDPERIPH_DRIVER) RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE); HW_I2C1_GPIO_Init(); HW_I2C1_I2C_Init(); I2C_Cmd(I2C1, ENABLE); #elif defined(USE_FULL_LL_DRIVER) LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_I2C1); HW_I2C1_GPIO_Init(); HW_I2C1_I2C_Init(); LL_I2C_Enable(I2C1); #endif } void HW_I2C1_DeInit(void) { } /******************************************************************************* * Function Name : I2C_Write * Description : Writes more than one byte to the Device with a single WRITE * cycle. The number of byte can't exceed the Device page size. * Input : - pBuffer : pointer to the buffer containing the data to be * written to the Device. * - WriteAddr : Device's internal address to write to. * - NumByteToWrite : number of bytes to write to the Device. * Output : None * Return : None *******************************************************************************/ bool HW_I2C_Write(uint8_t DevAddr, uint8_t RegAddr, uint8_t* pBuffer, uint8_t NumByteToWrite) { DevAddr >>= 1; #if defined(USE_STDPERIPH_DRIVER) /* While the bus is busy */ while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) != RESET){} /* Send Touch address for write */ I2C_TransferHandling(I2C1, (DevAddr<<1), 1, I2C_Reload_Mode, I2C_Generate_Start_Write); while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS)==RESET){} I2C_SendData(I2C1, RegAddr); while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TCR) == RESET){} I2C_TransferHandling(I2C1, (DevAddr<<1), NumByteToWrite, I2C_AutoEnd_Mode, I2C_No_StartStop); /* While there is data to be written */ while(NumByteToWrite--) { /* Test on EV8 and clear it */ while (I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS) == RESET){} /* Send the current byte */ I2C_SendData(I2C1, *pBuffer); /* Point to the next byte to be written */ pBuffer++; } /* Send STOP condition */ while(I2C_GetFlagStatus(I2C1, I2C_FLAG_STOPF) != RESET){} I2C_ClearFlag(I2C1, I2C_FLAG_STOPF); #elif defined(USE_FULL_LL_DRIVER) /* While the bus is busy */ while(LL_I2C_IsActiveFlag_BUSY(I2C1)){} /* Send Touch address for write */ LL_I2C_HandleTransfer(I2C1, (DevAddr<<1), 1, 1, LL_I2C_MODE_RELOAD, LL_I2C_GENERATE_START_WRITE); while(!LL_I2C_IsActiveFlag_TXIS(I2C1)){} LL_I2C_TransmitData8(I2C1, RegAddr); while(!LL_I2C_IsActiveFlag_TCR(I2C1)){} LL_I2C_HandleTransfer(I2C1, (DevAddr<<1), 1, NumByteToWrite, LL_I2C_MODE_AUTOEND, LL_I2C_GENERATE_NOSTARTSTOP); /* While there is data to be written */ while(NumByteToWrite--) { /* Test on EV8 and clear it */ while(!LL_I2C_IsActiveFlag_TXIS(I2C1)){} /* Send the current byte */ LL_I2C_TransmitData8(I2C1, *pBuffer); /* Point to the next byte to be written */ pBuffer++; } /* Send STOP condition */ while(!LL_I2C_IsActiveFlag_STOP(I2C1)){} LL_I2C_ClearFlag_STOP(I2C1); #endif return true; } /******************************************************************************* * Function Name : I2C_Read * Description : Reads a block of data from the Device. * Input : - pBuffer : pointer to the buffer that receives the data read * from the Device. * - ReadAddr : EEPROM's internal address to read from. * - NumByteToRead : number of bytes to read from the Device. * Output : None * Return : None *******************************************************************************/ bool HW_I2C_Read(uint8_t DevAddr, uint8_t RegAddr, uint8_t* pBuffer, uint8_t NumByteToRead) { DevAddr >>= 1; #if defined(USE_STDPERIPH_DRIVER) /* While the bus is busy */ while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) != RESET){} /* Generate start & wait event detection */ I2C_TransferHandling(I2C1, (DevAddr<<1), 1, I2C_SoftEnd_Mode, I2C_Generate_Start_Write); while (I2C_GetFlagStatus(I2C1, I2C_FLAG_TXIS) == RESET){} I2C_SendData(I2C1, RegAddr); while (I2C_GetFlagStatus(I2C1, I2C_FLAG_TC) == RESET){} /* Send STRAT condition a second time */ I2C_TransferHandling(I2C1, (DevAddr<<1), NumByteToRead, I2C_AutoEnd_Mode, I2C_Generate_Start_Read);