DIY数字仪表：G0板开发：读取传感器数据

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主程序主要代码

main.c

MX_GPIO_Init();MX_USART2_UART_Init();//G0和F7通信MX_USART1_UART_Init();MX_USART3_UART_Init();MX_USART4_UART_Init();//PrintfMX_I2C1_Init();APP_Init(); while (1)  {        tmp = HAL_GetTick();        if(tmp - tick > 1000)        {                tick = tmp;                APP_Process();                printf("APP_Process\n\r");        }  }读取传感器数据STM32CubeMX配置I2C外设

主要代码

sht30hi2c.c

/* Includes ------------------------------------------------------------------*/#include "i2c.h"#include "sht30.h"extern I2C_HandleTypeDef hi2c1;typedef enum{  SHT30_OK       = 0x00U,  SHT30_ERROR    = 0x01U,} SHT30_StatusTypeDef;//======================================I2Cx redefine start===================================static void I2Cx_Error(uint8_t Addr){  /* De-initialize the I2C communication bus */  HAL_I2C_DeInit(&hi2c1);    /* Re-Initialize the I2C communication bus */  MX_I2C1_Init();} static void SHT3X_WriteCMD(unsigned short cmd){        uint8_t buf[2];        buf[0]=cmd>>8;        buf[1]=cmd;        HAL_StatusTypeDef status = HAL_OK;        status = HAL_I2C_Master_Transmit(&hi2c1, SHT3X_WR_ADDR, buf, 2, 1000);        if(status != HAL_OK)        {                /* I2C error occurred */               I2Cx_Error(SHT3X_WR_ADDR);        }}static int SHT3X_ReadData(unsigned short cmd, unsigned char *buf, unsigned short len){        HAL_StatusTypeDef status = HAL_OK;        status = HAL_I2C_Mem_Read(&hi2c1, SHT3X_WR_ADDR, cmd, I2C_MEMADD_SIZE_16BIT, buf, len, 1000);        if(status != HAL_OK)        {                /* I2C error occurred */               I2Cx_Error(SHT3X_WR_ADDR);        }        return SHT30_OK;}static unsigned char SHT3X_CalcCrc(unsigned char *crcdata, unsigned char nbrOfBytes){    unsigned char Bit;        // bit mask    unsigned char crc = 0xFF; // calculated checksum    unsigned char byteCtr;    // byte counter      // calculates 8-Bit checksum with given polynomial     for(byteCtr = 0; byteCtr < nbrOfBytes; byteCtr++)    {        crc ^= (crcdata[byteCtr]);        for(Bit = 8; Bit > 0; --Bit)        {             if(crc & 0x80) crc = (crc << 1) ^ POLYNOMIAL;            else           crc = (crc << 1);        }    }    return crc;} void SHT3X_Init(void){        HAL_Delay(20);    SHT3X_WriteCMD(CMD_MEAS_PERI_10_H); } int SHT3X_GetTempAndHumi(short *temp, short *humi){    unsigned long int  rawValueTemp;    // temperature raw value from sensor    unsigned long int  rawValueHumi;    // humidity raw value from sensor    unsigned char Rdata[6]={0};           if(SHT3X_ReadData(CMD_FETCH_DATA, Rdata, 6)==SHT30_ERROR)        {                return SHT30_ERROR;        }    if(Rdata[2] == SHT3X_CalcCrc(Rdata, 2) && Rdata[5] == SHT3X_CalcCrc(&Rdata[3], 2))    {        rawValueTemp = (Rdata[0] << 8) | Rdata[1];        rawValueHumi = (Rdata[3] << 8) | Rdata[4];        *temp =(short)(1750 * rawValueTemp / 65535 - 450);        *humi =(short)(1000 * rawValueHumi / 65535);                   HAL_GPIO_TogglePin(USR_LED1_GPIO_Port, USR_LED1_Pin);//LED1        return SHT30_OK;    }    return SHT30_ERROR;}

sht30.h

/* Define to prevent recursive inclusion -------------------------------------*/#ifndef __sht30_H#define __sht30_H#ifdef __cplusplus extern "C" {#endif/* Includes ------------------------------------------------------------------*/#include "main.h"#define CMD_READ_SERIALNBR   0x3780 // read serial number#define CMD_READ_STATUS      0xF32D // read status register#define CMD_CLEAR_STATUS     0x3041 // clear status register#define CMD_HEATER_ENABLE    0x306D // enabled heater#define CMD_HEATER_DISABLE   0x3066 // disable heater#define CMD_SOFT_RESET       0x30A2 // soft reset#define CMD_MEAS_CLOCKSTR_H  0x2C06 // meas. clock stretching, high rep.#define CMD_MEAS_CLOCKSTR_M  0x2C0D // meas. clock stretching, medium rep.#define CMD_MEAS_CLOCKSTR_L  0x2C10 // meas. clock stretching, low rep.#define CMD_MEAS_POLLING_H   0x2400 // meas. no clock stretching, high rep.#define CMD_MEAS_POLLING_M   0x240B // meas. no clock stretching, medium rep.#define CMD_MEAS_POLLING_L   0x2416 // meas. no clock stretching, low rep.#define CMD_MEAS_PERI_05_H   0x2032 // meas. periodic 0.5 mps, high rep.#define CMD_MEAS_PERI_05_M   0x2024 // meas. periodic 0.5 mps, medium rep.#define CMD_MEAS_PERI_05_L   0x202F // meas. periodic 0.5 mps, low rep.#define CMD_MEAS_PERI_1_H    0x2130 // meas. periodic 1 mps, high rep.#define CMD_MEAS_PERI_1_M    0x2126 // meas. periodic 1 mps, medium rep.#define CMD_MEAS_PERI_1_L    0x212D // meas. periodic 1 mps, low rep.#define CMD_MEAS_PERI_2_H    0x2236 // meas. periodic 2 mps, high rep.#define CMD_MEAS_PERI_2_M    0x2220 // meas. periodic 2 mps, medium rep.#define CMD_MEAS_PERI_2_L    0x222B // meas. periodic 2 mps, low rep.#define CMD_MEAS_PERI_4_H    0x2334 // meas. periodic 4 mps, high rep.#define CMD_MEAS_PERI_4_M    0x2322 // meas. periodic 4 mps, medium rep.#define CMD_MEAS_PERI_4_L    0x2329 // meas. periodic 4 mps, low rep.#define CMD_MEAS_PERI_10_H   0x2737 // meas. periodic 10 mps, high rep.#define CMD_MEAS_PERI_10_M   0x2721 // meas. periodic 10 mps, medium rep.#define CMD_MEAS_PERI_10_L   0x272A // meas. periodic 10 mps, low rep.#define CMD_FETCH_DATA       0xE000 // readout measurements for periodic mode#define CMD_R_AL_LIM_LS      0xE102 // read alert limits, low set#define CMD_R_AL_LIM_LC      0xE109 // read alert limits, low clear#define CMD_R_AL_LIM_HS      0xE11F // read alert limits, high set#define CMD_R_AL_LIM_HC      0xE114 // read alert limits, high clear#define CMD_W_AL_LIM_LS      0x6100 // write alert limits, low set#define CMD_W_AL_LIM_LC      0x610B // write alert limits, low clear#define CMD_W_AL_LIM_HS      0x611D // write alert limits, high set#define CMD_W_AL_LIM_HC      0x6116 // write alert limits, high clear#define CMD_NO_SLEEP         0x303E#define POLYNOMIAL  0x31 // P(x) = x^8 + x^5 + x^4 + 1 = 00110001#define SHT3XADDR     0x44                 //SHT3X的I2C地址#define SHT3X_WR_ADDR     (SHT3XADDR << 1)#define SHT3X_RD_ADDR    (SHT3X_WR_ADDR | 0x01)void SHT3X_Init(void);int SHT3X_GetTempAndHumi(short *temp, short *humi);#ifdef __cplusplus}#endif#endif /*__ usart_H */

G0子板与F7子板通信STM32CubeMX配置USART外设

根据原理图,STM32CubeMX配置G0通过USART2与F7子板通信外设:

主要代码

app.c

static short temperature = 0, humidity = 0;#define FRM_START                0x68#define FRM_CMD_UPD_SENSOR       0x01#define FRM_FIXLEN               14#define FRM_END0                 0x5c#define FRM_END1                 0x6e#define FRM_POS_START            0#define FRM_POS_CMD              1#define FRM_POS_LEN              2#define FRM_POS_DATA             3#define FRM_POS_CRC              11#define FRM_POS_END0             12#define FRM_POS_END1             13//eg:68 cmd len t t h h x x y y crc 16 / crc = 68 + cmd + len + t + t + h + h + x + x + y + y 16extern UART_HandleTypeDef huart2;uint8_t cal_crc(uint8_t *buf,uint8_t len){       uint8_t t_crc = 0;       uint8_t r_crc = 0;        //check crc        for(int i=0; i