STM32F407-驅動SHT41采集溫濕度

SHT41

SHT41通過I2C方式進行驅動

從機地址： 0x44

獲取數據方式
1）先發送I2C寫，寫入特定指令
2）延時一段時間，等待SHT41處理
3）再進行I2C讀，讀數據即可

一些指令如下：
demo

STM32F407驅動

I2C初始化

void my_sht41_init()
{GPIO_InitTypeDef GPIO_InitStructure;I2C_InitTypeDef  I2C_InitStructure;RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE); GPIO_PinAFConfig(GPIOB,GPIO_PinSource8,GPIO_AF_I2C1);GPIO_PinAFConfig(GPIOB,GPIO_PinSource9,GPIO_AF_I2C1); GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 ;  GPIO_Init(GPIOB, &GPIO_InitStructure);I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;I2C_InitStructure.I2C_ClockSpeed = 300000;I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;I2C_InitStructure.I2C_OwnAddress1 = STM32_I2C_OWN_ADDR;	I2C_Init(I2C1, &I2C_InitStructure); I2C_Cmd(I2C1, ENABLE);}

讀SHT41 芯片ID

void my_sht41_read_id(void)
{uint8_t data[6] = {0};uint8_t ret = 0;uint16_t time = 0xFFF;my_sht41_send_cmd(0x89);printf("開始延遲\n");while(time){time--;}printf("延時結束\n");ret = my_SHT41_buffer_read(data,6);if(ret == 0){printf("data[0] = 0x%x\n",data[0]);printf("data[1] = 0x%x\n",data[1]);printf("data[3] = 0x%x\n",data[3]);printf("data[4] = 0x%x\n",data[4]);}else{printf("讀取ID錯誤!\n");}}

讀溫度濕度數據

void my_sht41_read_data(void)
{uint8_t data[6] = {0};uint8_t ret = 0;uint32_t time = 0xFFFFFF;my_sht41_send_cmd(0xFD);uint16_t recovery_temper = 0u;uint16_t recovery_hum = 0u;float temp = 0.f;float hum = 0.f;printf("開始延遲\n");while(time){time--;}printf("延時結束\n");ret = my_SHT41_buffer_read(data,6);if(ret == 0){printf("data[0] = 0x%x\n",data[0]);printf("data[1] = 0x%x\n",data[1]);printf("data[3] = 0x%x\n",data[3]);printf("data[4] = 0x%x\n",data[4]);}else{printf("讀取ID錯誤!\n");}recovery_temper = ((uint16_t)data[0]<<8)|data[1];temp = -45 + 175*((float)recovery_temper/65535);/* 轉換濕度數據 */recovery_hum = ((uint16_t)data[3]<<8)|data[4];hum = -6 + 125 * ((float)recovery_hum / 65535);if(hum>=100)   //根據數據手冊編寫hum=100;else if(hum<=0)hum=0;printf("溫度為：%.2f",temp);printf("濕度為：%.1f%%",hum);}

I2C讀寫接口

static uint8_t my_sht41_send_cmd(uint8_t data)
{uint32_t count_wait;I2C_GenerateSTART(I2C1,ENABLE); count_wait = TIME_OUT;while(I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT) != SUCCESS){count_wait--;if(count_wait == 0) {return Error_CallBack(1);}}I2C_Send7bitAddress(I2C1, SHT41_I2C_ADDR, I2C_Direction_Transmitter); count_wait = TIME_OUT;while(I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) != SUCCESS){count_wait--;if(count_wait == 0) {return Error_CallBack(2);}}//發送數據I2C_SendData(I2C1,data); count_wait = TIME_OUT;while(I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED) != SUCCESS){count_wait--;if(count_wait == 0) {return Error_CallBack(4);}}	I2C_GenerateSTOP(I2C1, ENABLE);return 0;}/*讀六個字節數據 */
static uint8_t my_SHT41_buffer_read(uint8_t *data,uint16_t size)
{uint32_t count_wait;//開始進行I2C通訊I2C_GenerateSTART(I2C1, ENABLE);if(size > 6){return 1;}count_wait = TIME_OUT;	//等待拉低while(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT) != SUCCESS){count_wait--;if(count_wait == 0 ){return Error_CallBack(16);}}	//讀模式I2C_Send7bitAddress(I2C1, SHT41_I2C_ADDR, I2C_Direction_Receiver);count_wait = TIME_OUT;while(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) != SUCCESS){count_wait--;if(count_wait == 0 ){return Error_CallBack(20);}}while(size--){if(size == 0){I2C_AcknowledgeConfig(I2C1, DISABLE);}else {I2C_AcknowledgeConfig(I2C1,ENABLE);}count_wait = TIME_OUT;		while(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED) != SUCCESS){count_wait--;if(count_wait == 0 ){return Error_CallBack(21);}}*data = I2C_ReceiveData(I2C1);data++;}I2C_GenerateSTOP(I2C1, ENABLE);return 0;}