freakone / hx711

Procedural implementation of HX711 library with HAL for STM32

HX711

Procedural implementation of HX711 library with HAL for STM32

hx711's Issues

HX711_AverageValue naming problem

Hi,
In the header file, there's a prototype for HX711_AverageValue function.
But the implementation has the name HX711_Average_Value in the .c file, with an extra underscore.

You may want to fix that

Master branch

Your "custom" branch works fine, but your master branch doesn't (problem at the end of the init function). Maybe you should set the "custom" branch "master" :)

Errors

you have some errors in your library. I resolve them.

//======
//hx711.h
//======
#ifndef HX711_H_
#define HX711_H_

#include "stm32f3xx_hal.h"

typedef struct _hx711
{
GPIO_TypeDef* gpioSck;
GPIO_TypeDef* gpioData;
uint16_t pinSck;
uint16_t pinData;
int offset;
int gain;
// 1: channel A, gain factor 128
// 2: channel B, gain factor 32
// 3: channel A, gain factor 64
} HX711;

void HX711_Init(HX711 data);
HX711 HX711_Tare(HX711 data, uint8_t times);
int HX711_Value(HX711 data);
int HX711_AverageValue(HX711 data, uint8_t times);

#endif /* HX711_H_ */

//======
//hx711.c
//======
#include "hx711.h"

void HX711_Init(HX711 data)
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Pin = data.pinSck;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(data.gpioSck, &GPIO_InitStruct);

GPIO_InitStruct.Pin = data.pinData;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(data.gpioData, &GPIO_InitStruct);

HAL_GPIO_WritePin(data.gpioSck, data.pinSck, GPIO_PIN_SET);
HAL_Delay(50);
HAL_GPIO_WritePin(data.gpioSck, data.pinSck, GPIO_PIN_RESET);

}

int HX711_AverageValue(HX711 data, uint8_t times)
{
int sum = 0;
for (int i = 0; i < times; i++)
{
sum += HX711_Value(data);
}

return sum / times;

}

int HX711_Value(HX711 data)
{
int buffer;
buffer = 0;

while (HAL_GPIO_ReadPin(data.gpioData, data.pinData)==1)
;

for (uint8_t i = 0; i < 24; i++)
{
	HAL_GPIO_WritePin(data.gpioSck, data.pinSck, GPIO_PIN_SET);

    buffer = buffer << 1 ;

    if (HAL_GPIO_ReadPin(data.gpioData, data.pinData))
    {
        buffer ++;
    }

    HAL_GPIO_WritePin(data.gpioSck, data.pinSck, GPIO_PIN_RESET);
}

for (int i = 0; i < data.gain; i++)
{
	HAL_GPIO_WritePin(data.gpioSck, data.pinSck, GPIO_PIN_SET);
	HAL_GPIO_WritePin(data.gpioSck, data.pinSck, GPIO_PIN_RESET);
}

buffer = buffer ^ 0x800000;
	buffer -= data.offset;

return buffer;

}

HX711 HX711_Tare(HX711 data, uint8_t times)
{
int sum = HX711_Average_Value(data, times);
data.offset = sum;
return data;
}

Example code request

I am trying to implement this library using Keil uVision on my stm32f3, but I am unable to understand how to implement the functions. Is it possible to add an example of the usage of this library?