!21 再次解决SHT30规范扫描问题
* 再次解决规范扫描问题 * 解决sht30 规范扫描问题 * 解决规范扫描问题 * 更新SHT30温湿度传感器例程
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苏宗耀
候鹏飞
parent
08b0a0096b
commit
2d12ef6985
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@ -19,20 +19,155 @@
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#include "cmsis_os2.h"
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#include "iot_i2c.h"
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#include "iot_errno.h"
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#include "iot_gpio.h"
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#include "hi_i2c.h"
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#define ADC_TASK_STACK_SIZE 4096
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#define ADC_TASK_PRIO 25
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#define SHT30_TASK_STACK_SIZE 4096
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#define SHT30_TASK_PRIO 25
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static void i2cSht30Task(void)
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#define SHT30_ADDR 0x44 //0x44接地，0x45接电源
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#define WriteHeader (SHT30_ADDR<<1) //地址+写命令
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#define ReadHeader (WriteHeader|0X01) //地址+读命令
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#define CMD_READ_SERIALNBR 0x3780 // read serial number
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#define CMD_MEAS_CLOCKSTR_H 0x2C06 // meas. clock stretching, high rep.
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// CRC
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#define POLYNOMIAL 0x131 // P(x) = x^8 + x^5 + x^4 + 1 = 100110001
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static unsigned char SHT3XCalcCrc(unsigned char data[], unsigned char nbrOfBytes)
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{
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unsigned char bit = 0; // bit mask
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unsigned char crc = 0xFF; // calculated checksum
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unsigned char byteCtr = 0; // byte counter
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// calculates 8-Bit checksum with given polynomial
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for(byteCtr = 0; byteCtr < nbrOfBytes; byteCtr++)
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{
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crc ^= (data[byteCtr]);
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for(bit = 8; bit > 0; --bit)
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{
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if(crc & 0x80)
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{
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crc = (crc << 1) ^ POLYNOMIAL;
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}
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else
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{
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crc = (crc << 1);
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}
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}
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}
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return crc;
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}
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//温度转换
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float SHT3XCalcTemperature(unsigned char *buf)
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{
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unsigned short rawValue = 0;
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rawValue = (((unsigned int)buf[0]) << 8) | ((unsigned int)buf[1]);
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return 175 * (float)rawValue / 65535 - 45;
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}
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//湿度转换
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float SHT3XCalcHumidity(unsigned char *buf)
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{
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unsigned short rawValue = 0;
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rawValue = (((unsigned short)buf[0]) << 8) | ((unsigned short)buf[1]);
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return 100 * (float)rawValue / 65535;
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}
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//SHT3X周期性模式读取数据函数,一次读取4byte
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static int SHT3xPeriodicReadData(unsigned short cmd, unsigned char *pbuf)
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{
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int ret = 0;
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unsigned char temp_crc = 0, hum_crc = 0;
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unsigned char buf[6] = {0};
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buf[0] = (unsigned char)(cmd >> 8)&0XFF;
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buf[1] = (unsigned char)(cmd >> 0)&0XFF;
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ret = IoTI2cWrite(HI_I2C_IDX_0, WriteHeader, buf, 2);
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if(ret != IOT_SUCCESS)
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{
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printf("I2C write data fail, ret = %d\r\n",ret);
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return ret;
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}
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usleep(20000);
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ret = IoTI2cRead(HI_I2C_IDX_0, ReadHeader, buf, 6);
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if(ret != IOT_SUCCESS)
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{
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printf("I2C read data fail, ret = %d\r\n",ret);
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return ret;
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}
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//crc校验读取到的数据
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temp_crc = buf[2];
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hum_crc = buf[5];
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if((temp_crc != SHT3XCalcCrc(buf,2)) || (hum_crc != SHT3XCalcCrc(&buf[3],2)))
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{
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printf("I2C read data crc check fail\r\n");
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return IOT_FAILURE;
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}
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pbuf[0] = buf[0];
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pbuf[1] = buf[1];
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pbuf[2] = buf[3];
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pbuf[3] = buf[4];
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return IOT_SUCCESS;
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}
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//读取芯片序列号
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static void SHT3xReadSerialNumber(unsigned int* serialNbr)
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{
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unsigned char number_buf[4] = {0};
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SHT3xPeriodicReadData(CMD_READ_SERIALNBR,number_buf);
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*serialNbr = (((unsigned int)number_buf[0]) << 24) + (((unsigned int)number_buf[1]) << 16)+\
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(((unsigned int)number_buf[2]) << 8) + ((unsigned int)number_buf[3]);
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}
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static void I2cSht30Task(void)
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{
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int ret = 0;
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unsigned int serialNumber = 0;
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unsigned char read_buf[4] = {0};
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float temp = 0, hum = 0;
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IoTGpioInit(IOT_GPIO_IO_GPIO_13);
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IoTGpioInit(IOT_GPIO_IO_GPIO_14);
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IotIoSetPull(IOT_GPIO_IO_GPIO_13, IOT_IO_PULL_UP);
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IotIoSetPull(IOT_GPIO_IO_GPIO_14, IOT_IO_PULL_UP);
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IotIoSetFunc(IOT_GPIO_IO_GPIO_13, HI_IO_FUNC_GPIO_13_I2C0_SDA);
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IotIoSetFunc(IOT_GPIO_IO_GPIO_14, HI_IO_FUNC_GPIO_14_I2C0_SCL);
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ret = IoTI2cInit(HI_I2C_IDX_0, 400000);
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if(ret != IOT_SUCCESS)
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{
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printf("I2c Init failed, ret = %d\r\n",ret);
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}
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SHT3xReadSerialNumber(&serialNumber);
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printf("sht30 serialNumber = %08X\r\n", serialNumber);
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for(;;)
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{
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if(SHT3xPeriodicReadData(CMD_MEAS_CLOCKSTR_H,read_buf) == IOT_SUCCESS)
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{
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temp = SHT3XCalcTemperature(&read_buf[0]);
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hum = SHT3XCalcHumidity(&read_buf[2]);
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}
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usleep(1000000);
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printf("sht30->> temp = %.02f, hum = %.01f\r\n",temp, hum);
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usleep(2000000);
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}
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}
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static void i2cSht30Entry(void)
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static void I2cSht30Entry(void)
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{
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osThreadAttr_t attr;
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attr.name = "uartTask";
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@ -40,13 +175,14 @@ static void i2cSht30Entry(void)
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attr.cb_mem = NULL;
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attr.cb_size = 0U;
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attr.stack_mem = NULL;
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attr.stack_size = ADC_TASK_STACK_SIZE;
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attr.priority = ADC_TASK_PRIO;
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attr.stack_size = SHT30_TASK_STACK_SIZE;
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attr.priority = SHT30_TASK_PRIO;
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if (osThreadNew((osThreadFunc_t)i2cSht30Task, NULL, &attr) == NULL) {
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printf("[i2cSht30Example] Falied to create i2cSht30Task!\n");
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if (osThreadNew((osThreadFunc_t)I2cSht30Task, NULL, &attr) == NULL)
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{
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printf("[i2cSht30Example] Falied to create I2cSht30Task!\n");
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}
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return;
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return;
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}
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APP_FEATURE_INIT(i2cSht30Entry);
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SYS_RUN(I2cSht30Entry);
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