stm32f103zet6的HX711的驱动代码

以下是基于STM32F103系列的HX711驱动代码，使用的是GPIO和SPI接口：

#include "hx711.h"

void HX711_GPIO_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(HX711_SCK_GPIO_CLK | HX711_DOUT_GPIO_CLK, ENABLE);

    GPIO_InitStructure.GPIO_Pin = HX711_SCK_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(HX711_SCK_GPIO_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = HX711_DOUT_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(HX711_DOUT_GPIO_PORT, &GPIO_InitStructure);
}

void HX711_SPI_Config(void)
{
    SPI_InitTypeDef SPI_InitStructure;
    RCC_APB2PeriphClockCmd(HX711_SPI_CLK, ENABLE);

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(HX711_SPI, &SPI_InitStructure);
    SPI_Cmd(HX711_SPI, ENABLE);
}

void HX711_Init(void)
{
    HX711_GPIO_Config();
    HX711_SPI_Config();
}

void HX711_Delay_us(uint32_t nus)
{
    uint32_t temp;
    SysTick->LOAD = 9 * nus; 
    SysTick->CTRL = 0x01;
    SysTick->VAL = 0;
    do{
        temp = SysTick->CTRL;
    }while ((temp & 0x01) && !(temp & (1 << 16))); 
    SysTick->CTRL = 0x00;
    SysTick->VAL = 0;
}

void HX711_Delay_ms(uint32_t nms)
{
    while (nms--)
    {
        HX711_Delay_us(1000);
    }
}

uint8_t HX711_Read_Data(void)
{
    uint8_t i;
    uint8_t read = 0;
    GPIO_ResetBits(HX711_SCK_GPIO_PORT, HX711_SCK_GPIO_PIN);
    HX711_Delay_us(1);

    for (i = 0; i < 8; i++)
    {
        GPIO_SetBits(HX711_SCK_GPIO_PORT, HX711_SCK_GPIO_PIN);
        read <<= 1;
        if (GPIO_ReadInputDataBit(HX711_DOUT_GPIO_PORT, HX711_DOUT_GPIO_PIN))
        {
            read++;
        }
        GPIO_ResetBits(HX711_SCK_GPIO_PORT, HX711_SCK_GPIO_PIN);
    }

    GPIO_SetBits(HX711_SCK_GPIO_PORT, HX711_SCK_GPIO_PIN);
    read ^= 0x80;
    GPIO_ResetBits(HX711_SCK_GPIO_PORT, HX711_SCK_GPIO_PIN);
    return read;
}

int32_t HX711_Read_Weight(void)
{
    uint32_t i;
    uint32_t weight = 0;
    uint8_t data;
    for (i = 0; i < 200; i++)//采集200次
    {
        data = HX711_Read_Data();
        weight += data;
        HX711_Delay_us(1);
    }
    return weight - HX711_OFFSET;//减去零点偏移值
}

void HX711_Tare(uint32_t times)
{
    uint32_t i;
    int32_t sum = 0;
    for (i = 0; i < times; i++)
    {
        sum += HX711_Read_Weight();
        HX711_Delay_ms(10);
    }
    HX711_OFFSET = sum / times;
}

需要注意的是，在使用HX711之前，需要先进行HX711_Tare函数的操作，获得当前的零点偏移值，然后在读取数据时需要减去这个偏移值。