STM32 硬件IIC读取BH1750

/* Includes ------------------------------------------------------------------*/ #include "main.h" I2C_INIT_INFO I2C_Info; //I2C控制器相关信息 #define I2C2_DR_Address 0x40005810 #define BufferSize 8 u8 I2C2_Buffer_Rx[BufferSize]; u8 I2C2_Buffer_Tx[BufferSize]; /* Private functions ---------------------------------------------------------*/ u8 I2C_HardInit(I2C_INIT_INFO *I2C_Info) { I2C_InitTypeDef I2C_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; if(0==I2C_Info->channel) { RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO , ENABLE); /* Configure I2C1 pins: PB6->SCL and PB7->SDA */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; GPIO_Init(GPIOB, &GPIO_InitStructure); I2C_DeInit(I2C1); I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; I2C_InitStructure.I2C_OwnAddress1 = 0x30; I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; if(I2C_Info->slaveAddr>>8) { I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_10bit; } else { I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; } I2C_InitStructure.I2C_ClockSpeed = I2C_Info->speed; I2C_Cmd(I2C1, ENABLE); I2C_Init(I2C1, &I2C_InitStructure); I2C_AcknowledgeConfig(I2C1, ENABLE); } else { RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO , ENABLE); /* Configure I2C2 pins: PB10->SCL and PB11->SDA */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; GPIO_Init(GPIOB, &GPIO_InitStructure); I2C_DeInit(I2C2); I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; I2C_InitStructure.I2C_OwnAddress1 = 0xA0;//0x30; I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; if(I2C_Info->slaveAddr>>8) { I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_10bit; } else { I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; } I2C_InitStructure.I2C_ClockSpeed = I2C_Info->speed; I2C_Cmd(I2C2, ENABLE); I2C_Init(I2C2, &I2C_InitStructure); I2C_AcknowledgeConfig(I2C2, ENABLE); } return 0; } u8 I2C_HardWriteNByte(I2C_TypeDef *I2Cx, uint32_t subaddr, uint8_t *s, uint32_t num) { uint32_t subaddrNum=I2C_Info.subAddrWidth; uint32_t retry=0; uint8_t *p_data=s; //p_data=I2C2_Buffer_Rx; I2C_GenerateSTART(I2Cx, ENABLE); retry=0; while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT)) { retry++; if(retry>=1000){ I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_MODE_SELECT_FAILED; } } //发送设备地址 if(I2C_Info.slaveAddr>>8) { //I2C_Send7bitAddress(I2Cx, I2C_Addr, I2C_Direction_Transmitter); } else { I2C_Send7bitAddress(I2Cx, I2C_Info.slaveAddr, I2C_Direction_Transmitter); retry=0; while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) { retry++; if(retry>=1000) { I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_TRANSMITTER_MODE_SELECTED_FAILED; } } } //发送子地址 while(subaddrNum>0){ I2C_SendData(I2Cx, subaddr>>((subaddrNum-1)*8)); retry=0; while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) { retry++; if(retry>=1000) { I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_BYTE_TRANSMITTED_FAILED; } } subaddrNum--; } //发送数据 while(num--){ I2C_SendData(I2Cx, *p_data++); retry=0; while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) { retry++; if(retry>=1000){ I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_BYTE_TRANSMITTED_FAILED; } } } //停止总线 I2C_GenerateSTOP(I2Cx, ENABLE); return 0; } u8 I2C_HardReadNByte(I2C_TypeDef *I2Cx, uint32_t subaddr,uint8_t *s,uint32_t num) { int32_t subaddrNum=I2C_Info.subAddrWidth; uint8_t *p_data=s; uint32_t retry=0; //p_data =I2C2_Buffer_Rx; while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY)) { retry++; if(retry>=1000) { I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_GET_I2C_FLAG_BUSY_FAILED; } } I2C_AcknowledgeConfig(I2Cx, ENABLE); I2C_GenerateSTART(I2Cx, ENABLE); retry=0; while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT)) { retry++; if(retry>=1000) { I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_MODE_SELECT_FAILED; } } if(subaddrNum>0) { //发送设备地址 if(I2C_Info.slaveAddr>>8) { //I2C_Send7bitAddress(I2Cx, I2C_Addr, I2C_Direction_Transmitter); } else { I2C_Send7bitAddress(I2Cx, I2C_Info.slaveAddr, I2C_Direction_Transmitter); retry=0; while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) { retry++; if(retry>=1000) { I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_TRANSMITTER_MODE_SELECTED_FAILED; } } } //发送子地址 while(subaddrNum>0) { I2C_SendData(I2Cx, subaddr>>((subaddrNum-1)*8)); retry=0; while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) { retry++; if(retry>=1000) { I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_BYTE_TRANSMITTED_FAILED; } } subaddrNum--; } //重新启动I2C总线 I2C_GenerateSTART(I2Cx, ENABLE); retry=0; while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT)) { retry++; if(retry>=1000) { I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_MODE_SELECT_FAILED; } } //发送读设备地址 I2C_Send7bitAddress(I2Cx, I2C_Info.slaveAddr, I2C_Direction_Receiver); retry=0; while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)) { retry++; if(retry>=1000) { I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_RECEIVER_MODE_SELECTED_FAILED; } } } else { I2C_Send7bitAddress(I2Cx, I2C_Info.slaveAddr, I2C_Direction_Receiver); retry=0; while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)) { retry++; if(retry>=1000) { I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_RECEIVER_MODE_SELECTED_FAILED; } } } //读取数据 while (num) { if(num==1) { I2C_AcknowledgeConfig(I2Cx, DISABLE); I2C_GenerateSTOP(I2Cx, ENABLE); } retry = 0; while(!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED)) { retry++; if(retry>=1000) { I2C_GenerateSTOP(I2Cx, ENABLE); return MASTER_BYTE_RECEIVED_FAILED; } } *p_data = I2C_ReceiveData(I2Cx); p_data++; /* Decrement the read bytes counter */ num--; } I2C_AcknowledgeConfig(I2Cx, ENABLE); return 0; }