提示：以下是本篇文章正文內(nèi)容，下面案例可供參考
一、模塊和接線(xiàn)
傳感器連接hx711，hx711連接STM32，如下圖所示
二、CubeMX配置
1.時(shí)鐘及sys
2.IO口
1）數(shù)據(jù)線(xiàn)DT設(shè)置為Input
2）時(shí)鐘線(xiàn)SCK設(shè)置為Output
3.串口
打開(kāi)串口并選擇中斷，其他配置保持不變
4.后續(xù)配置
三、程序
1.main.c
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
extern uint8_t ReceiveBuff[BUFFERSIZE];
extern uint8_t recv_end_flag,Rx_len;
extern uint32_t weight_first;
extern uint32_t weight_real;
uint32_t weight_print = 0;//質(zhì)量打印
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART1_UART_Init();
MX_USART6_UART_Init();
/* USER CODE BEGIN 2 */
printf("壓力傳感器HX711\r\n");
weight_first = ReadCount();//首次讀取重量進(jìn)行去皮操作
printf("首次質(zhì)量weight_first=%d\n",weight_first);
HAL_Delay(100);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
weight_print = WeightReal();//實(shí)際質(zhì)量計(jì)算
printf("重量為：%dg\n",weight_print);
HAL_Delay(100);
}
/* USER CODE END 3 */
}
2.hx711.c
注：根據(jù)官方給出的程序?qū)慠eadCount，紅色框程序要稍微改一下。將ADSK=1;與ADSK=0;看作一個(gè)數(shù)據(jù)傳輸周期的開(kāi)始和結(jié)束，if語(yǔ)句中count值仍在變化，等于數(shù)據(jù)傳輸還沒(méi)結(jié)束，所以要將結(jié)束標(biāo)志ADSK=0放到if語(yǔ)句后。
1ADSK=0;//指SCK時(shí)鐘線(xiàn)電平置低。2ADSK=1;//指SCK時(shí)鐘線(xiàn)電平置高。3while(ADDO);//判斷AD轉(zhuǎn)換器是否準(zhǔn)備好（DOUT應(yīng)為低電平），ADDO=0,程序正常進(jìn)行，否則ADDO=1一直進(jìn)行while循環(huán)。
4 i 的取值范圍根據(jù)手冊(cè)中的此處給出，為24-26，分別對(duì)應(yīng)不同的通道和增益。
#include "hx711.h"
#include "stdio.h"
#include "stdint.h"
#include "gpio.h"
uint8_t ReceiveBuff[BUFFERSIZE]; //接收緩沖區(qū)
uint8_t recv_end_flag = 0,Rx_len;//接收完成中斷標(biāo)志，接收到字符長(zhǎng)度
uint32_t weight_first = 0;//首次質(zhì)量
uint32_t weight_real = 0;//每次讀取的實(shí)際值
/***********************************************************************************************
*Name : ReadCount
*Function : 讀取傳感器數(shù)值，通道A，增益128
*Parameter : count 計(jì)數(shù)值
i 24位數(shù)據(jù)計(jì)數(shù)，改變i的值可選擇不同通道和增益24~26
***********************************************************************************************/
uint32_t ReadCount(void)
{
uint32_t Count = 0;
uint8_t i = 0;
HAL_Delay(10);
HAL_GPIO_WritePin(SCK_GPIO_Port, SCK_Pin, GPIO_PIN_RESET);
while(HAL_GPIO_ReadPin(DT_GPIO_Port, DT_Pin));//判斷AD轉(zhuǎn)換器是否準(zhǔn)備好（DOUT應(yīng)為低電平）
for(i = 0; i <24; i++)//24
{
HAL_GPIO_WritePin(SCK_GPIO_Port, SCK_Pin, GPIO_PIN_SET);
Count = Count << 1;
if(HAL_GPIO_ReadPin(DT_GPIO_Port, DT_Pin))
{
Count ++;
}
HAL_GPIO_WritePin(SCK_GPIO_Port, SCK_Pin, GPIO_PIN_RESET);
}
HAL_GPIO_WritePin(SCK_GPIO_Port, SCK_Pin, GPIO_PIN_SET);
Count = Count ^ 0x800000;
HAL_GPIO_WritePin(SCK_GPIO_Port, SCK_Pin, GPIO_PIN_RESET);
return Count;
}
/***********************************************************************************************
*Name : ReadWeight
*Function : 讀取拉力值
*Parameter : weight_real 實(shí)際拉力值
weight_first 傳感器首次數(shù)據(jù)
***********************************************************************************************/
uint32_t WeightReal(void)
{
weight_real = ReadCount();//實(shí)際質(zhì)量計(jì)算
if(weight_first>=weight_real)
{
weight_real = weight_first-weight_real;
weight_real = weight_real/100;
//printf("重量為：%dg\n",weight_real);
}
else
{
weight_real = weight_real-weight_first;
weight_real = weight_real/100;
//printf("重量為：-%dg\n",weight_real);
}
return weight_real;
}
3.hx711.h
#ifndef HX711
#define HX711
#include "stdint.h"
#define BUFFERSIZE 255 //可以接收的最大字符個(gè)數(shù)
uint32_t ReadCount(void);
uint32_t ReadWeight(void);
#endif
4.串口重定向
放在usart.c中
int fputc(int ch, FILE *f)
{
HAL_UART_Transmit(&huart6, (uint8_t *)&ch, 1, 0xffff);
return ch;
}
總結(jié)
提示：本文章學(xué)到的一個(gè)主要知識(shí)點(diǎn)是ReadCount函數(shù)中的
通訊邏輯是先將數(shù)據(jù)線(xiàn)電平拉高，代表數(shù)據(jù)開(kāi)始傳輸，等待接收完數(shù)據(jù)后，數(shù)據(jù)線(xiàn)電平置低，數(shù)據(jù)傳輸結(jié)束。文章來(lái)源：http://www.zghlxwxcb.cn/news/detail-428330.html
參考文章
涂鴉模組開(kāi)發(fā)（壓力傳感器HX711）——2. 壓力傳感器HX711文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-428330.html
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