cubemx stm32 afm3000 module gas flow sensor driver code

afm3000

• AFM3000 The sensor is a digital flow meter from Osun Electronics,Specifically designed for ventilator applications.It measures air with great precision,Flow of oxygen and other non-aggressive gases.Special design is adopted in the air duct,This results in a very low pressure loss of the fluid passing through the sensor,Make its performance suitable for a variety of demanding application scenarios,Such as medical ventilation and respiratory applications.
• AFM3000 采用 5V supply voltage operation,具有数字 I2C 接口.Output measurements are internally calibrated and temperature compensated.
• The superior performance of this sensor is based on Osun Electronics' sensor technology,The interior consists of a thermal sensor chip and a high-performance integration 24 位 AD 采集的 CMOS connected to the microprocessor.Gas flow is measured by thermal sensor chips,This ensures very fast signal processing times and best-in-class accuracy with bidirectional measurement capabilities.

cubemx配置

1. 开个I2C
   
2. 串口配置
   

硬件连接

代码

afm3000

afm3000.c

#include "afm3000.h"


/* 设备i2c地址 */
#define AFM_WAdd 0x80 // 写地址
#define AFM_RAdd 0x81 // 读地址


/* 设备命令 */

//#define AFM_FlowCollect 0x1000 // 流量采集
#define AFM_FlowRead 0x1000 // 读取流量：返回2个字节
#define AFM_IDRead 0x31AE // 读取ID号：返回4个字节
#define AFM_Reset 0x2000 // 复位指令


/* 内部函数声明 */
static HAL_StatusTypeDef afm3000_write(uint16_t afmCmd, uint8_t * afmData, uint16_t afmDataSize);
static HAL_StatusTypeDef afm3000_read(uint16_t afmCmd, uint8_t * afmData, uint16_t afmDataSize);

/* 内部函数实现 */
static HAL_StatusTypeDef afm3000_write(uint16_t afmCmd, uint8_t * afmData, uint16_t afmDataSize)
{
    
	return HAL_I2C_Mem_Write(&AFM_hi2c, AFM_WAdd, afmCmd, I2C_MEMADD_SIZE_16BIT, afmData, afmDataSize, 0xffff);
}

static HAL_StatusTypeDef afm3000_read(uint16_t afmCmd, uint8_t * afmData, uint16_t afmDataSize)
{
    
	return HAL_I2C_Mem_Read(&AFM_hi2c, AFM_RAdd, afmCmd, I2C_MEMADD_SIZE_16BIT, afmData, afmDataSize, 0xffff);
}
	

/* 外部函数 */

/* 复位AFM3000 参数 ： 无 返回值 ： 来自 HAL_StatusTypeDef 枚举中 */
HAL_StatusTypeDef afm3000_Reset(void)
{
    
	uint8_t *afmData = NULL;
	return afm3000_write(AFM_Reset, afmData, 0);
}

/* 获取AFM3000的值 参数 ： afmGetVal Get data by pointer 返回值 ： 来自 HAL_StatusTypeDef 枚举中 */
HAL_StatusTypeDef afm3000_GetVal(uint16_t * afmGetVal)
{
    
	uint8_t afmVal[3] = {
    0};	// 2字节的数据 + 1字节的CRC
	HAL_StatusTypeDef afmState = HAL_ERROR;
	
	HAL_Delay(20); // 至少等待10ms一次数据,Double the delay to be on the safe side
	
	afmState = afm3000_read(AFM_FlowRead, afmVal, 3);
	
	*afmGetVal = (afmVal[0]<<8 | afmVal[1]);	//I don't know if it's high or low,先测试一波
	*afmGetVal = (*afmGetVal - AFM_Offset) / AFM_FlowCoeff; // 计算数据,根据公式 （（测试量 - 偏移量）/ 流量系数）
	
	
	return afmState;
}



/* 初始化AFM3000 参数 ： 无 返回值 ： 来自 HAL_StatusTypeDef 枚举中 */
HAL_StatusTypeDef afm3000_Init(void)
{
    
	uint16_t afmGetVal = 0;
	HAL_StatusTypeDef afmState = HAL_ERROR;
	
	afm3000_Reset();	// reset first
	
	// The data obtained the previous few times was inaccurate,去掉
	for(uint8_t i=0; i<5; i++)
	{
    
		afmState = afm3000_GetVal(&afmGetVal);
	}

	return afmState;
}

afm3000.h

#ifndef _AFM3000_H_
#define _AFM3000_H_


#include "i2c.h"

/* i2c句柄 */
#define AFM_hi2c hi2c1

/* AFMOffset and flow coefficient of air （不知道可不可以修改,I don't know if the original value is this or not）*/

#define AFM_Offset 32000 // 偏移量
#define AFM_FlowCoeff 140 // Air flow coefficient


/* 外部函数区 */
HAL_StatusTypeDef afm3000_Reset(void);
HAL_StatusTypeDef afm3000_GetVal(uint16_t * afmGetVal);
HAL_StatusTypeDef afm3000_Init(void);


/* // 使用示例 // 初始化 if(afm3000_Init() == HAL_OK) { printf("afm3000_Init OK !"); } else { printf("afm3000_Init failed ..."); } // 获取数据 uint16_t afmGetVal = 0; afm3000_GetVal(&afmGetVal); printf("Flow Val : %d slm", afmGetVal); */

#endif /* _AFM3000_H_ */

main

头文件

#include "stdio.h"
#include "afm3000.h"

初始化

	uint16_t afmGetVal = 0;


	if(afm3000_Init() == HAL_OK)
	{
    
		printf("afm3000_Init OK !");
	}
	else
	{
    
		printf("afm3000_Init failed ...");
	}

循环中

		afm3000_GetVal(&afmGetVal);
		printf("Flow Val : %d slm", afmGetVal);
		
		HAL_Delay(500);