NUCLEO-G431RB:基于STM32G431 OPAMP的热电偶测温程序

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dsjsjf 发布时间：2020-11-11 18:59

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先上主角儿。板载的ST-LINK V3有点抢眼了。。。

拿到开发板后，一直在纠结做什么好，工作之余就翻开资料看看，发现STM32G431有三个可编程运放，对于我们工作上经常用到小信号放大的情况，倒是一个不错的方案。可以省掉一个运放及外围电路。

刚开始被搞懵了，手册上只讲了三种模式

而CubeMX中有一堆模式可选

本来从手册的字面意思上，比较好选的，但到了CubeMX中，无从下手了，没办法，只好再去啃手册。

本来想用差分输入方式的，但它这个好像不支持（也没再去深究），目前就用单端输入方式。

下面正式开始：（因为MCU属于新款的，所以该升级到最新版本的软件工具要升到最新版，否则可能不支持）

一、利用STM32CubeMX创建并配置工程

直接选择NUCLEO-G431RB板，并初始化为缺省模式（这种方式和板子最搭）。

二、配置OPAMP2，选择PGA Not Connected 模式，Gain我选择的是64（最大）。配置后，会看到PA6和PA7被分配成了OPA的输出端和输入端。因为我要连接到内部的ADC，这里其实是不需要输出的，不过我暂时还没找到怎么把OUT管脚用于其他功能。

三、配置ADC2，选择通道为VOPAMP2 Channel。下面的参数就不细说了，和其他系列的MCU基本差别不大，再配置一下DMA，AD转换需要用到DMA。

四、配置完成，生成代码，运行效果。通过板载的虚拟串口发出温度数据，没有做数据处理以及校准，精度还是可以的。

以下为main.c中的代码，其它代码为CubeMX生成的，未作改动。

/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <string.h>
#include <stdio.h>
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define ADC_DMA_LENGTH 32
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc2;
DMA_HandleTypeDef hdma_adc2;
UART_HandleTypeDef hlpuart1;
OPAMP_HandleTypeDef hopamp2;
/* USER CODE BEGIN PV */
uint32_t AdcData[ADC_DMA_LENGTH];
uint16_t RealTemp = 0;
uint32_t VolmV = 0;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_LPUART1_UART_Init(void);
static void MX_OPAMP2_Init(void);
static void MX_DMA_Init(void);
static void MX_ADC2_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/*******************************************************************************
** 函数名: Quick_Sort
** 功能: 选择排序法
** 参数: unsigned int *a 待排列的数组指针
** unsigned int i 待排列的数组起始元素下标
** unsigned int j 待排列的数组结束元素下标
** 返回: 无
** 备注:
*******************************************************************************/
void Quick_Sort(int *a, int i, int j)
{
int m,n,temp;
int k;
m = i;
n = j;
k = a[(i+j) / 2];/*选取的参照*/
do{
while((a[m] < k) && (m < j))
{/*从左到右找比k大的元素*/
m++;
}
while((a[n] > k) && (n > i))
{/*从右到左找比k小的元素*/
n--;
}
if(m <= n)
{/*若找到且条件满足，则交换*/
temp = a[m];
a[m] = a[n];
a[n] = temp;
m++;
n--;
}
}while(m <= n);
if(m < j)
{
Quick_Sort(a, m, j);/*运用递归*/
}
if(n > i)
{
Quick_Sort(a, i, n);
}
}
uint32_t Get_Temp(uint32_t *pArray)
{
uint32_t Value = 0;
uint32_t SortArray[ADC_DMA_LENGTH];
for(uint32_t i=0; i<ADC_DMA_LENGTH; i++)
{
SortArray[i] = *(pArray + i);
}
Quick_Sort((int *)SortArray, 0, ADC_DMA_LENGTH-1);
for(uint32_t i=4; i<(ADC_DMA_LENGTH-4); i++)
{
Value += SortArray[i];
}
Value /= (ADC_DMA_LENGTH-8);
//换算成mV值(0.1mV)
Value *= 33000;
Value /= 4096;
//换算成温度值，1000度对应41mV
Value *= 100;
Value /= 41;
//最后把增益除掉
Value /= 64;
Value += 60;//没有做校准，所以程序里直接加上一个偏置值
return Value;
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
static char TempStr[64];
/* 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_LPUART1_UART_Init();
MX_OPAMP2_Init();
MX_DMA_Init();
MX_ADC2_Init();
/* USER CODE BEGIN 2 */
HAL_ADC_Start_DMA(&hadc2, (uint32_t *)AdcData, ADC_DMA_LENGTH);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
// HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
RealTemp = Get_Temp(AdcData);
sprintf((char *)TempStr, "\r\nthe temperature is %d ℃\r\n\0", RealTemp);
HAL_UART_Transmit(&hlpuart1, (uint8_t *)TempStr, strlen(TempStr), 500);
HAL_Delay(500);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
/** Configure the main internal regulator output voltage
*/
HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1_BOOST);
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV4;
RCC_OscInitStruct.PLL.PLLN = 85;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_8) != HAL_OK)
{
Error_Handler();
}
/** Initializes the peripherals clocks
*/
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_LPUART1|RCC_PERIPHCLK_ADC12;
PeriphClkInit.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_PCLK1;
PeriphClkInit.Adc12ClockSelection = RCC_ADC12CLKSOURCE_SYSCLK;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief ADC2 Initialization Function
* @param None
* @retval None
*/
static void MX_ADC2_Init(void)
{
/* USER CODE BEGIN ADC2_Init 0 */
/* USER CODE END ADC2_Init 0 */
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC2_Init 1 */
/* USER CODE END ADC2_Init 1 */
/** Common config
*/
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV16;
hadc2.Init.Resolution = ADC_RESOLUTION_12B;
hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc2.Init.GainCompensation = 0;
hadc2.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc2.Init.LowPowerAutoWait = DISABLE;
hadc2.Init.ContinuousConvMode = ENABLE;
hadc2.Init.NbrOfConversion = 1;
hadc2.Init.DiscontinuousConvMode = DISABLE;
hadc2.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc2.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc2.Init.DMAContinuousRequests = ENABLE;
hadc2.Init.Overrun = ADC_OVR_DATA_PRESERVED;
hadc2.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc2) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_VOPAMP2;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_640CYCLES_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC2_Init 2 */
/* USER CODE END ADC2_Init 2 */
}
/**
* @brief LPUART1 Initialization Function
* @param None
* @retval None
*/
static void MX_LPUART1_UART_Init(void)
{
/* USER CODE BEGIN LPUART1_Init 0 */
/* USER CODE END LPUART1_Init 0 */
/* USER CODE BEGIN LPUART1_Init 1 */
/* USER CODE END LPUART1_Init 1 */
hlpuart1.Instance = LPUART1;
hlpuart1.Init.BaudRate = 115200;
hlpuart1.Init.WordLength = UART_WORDLENGTH_8B;
hlpuart1.Init.StopBits = UART_STOPBITS_1;
hlpuart1.Init.Parity = UART_PARITY_NONE;
hlpuart1.Init.Mode = UART_MODE_TX_RX;
hlpuart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
hlpuart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
hlpuart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&hlpuart1) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetTxFifoThreshold(&hlpuart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetRxFifoThreshold(&hlpuart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_DisableFifoMode(&hlpuart1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN LPUART1_Init 2 */
/* USER CODE END LPUART1_Init 2 */
}
/**
* @brief OPAMP2 Initialization Function
* @param None
* @retval None
*/
static void MX_OPAMP2_Init(void)
{
/* USER CODE BEGIN OPAMP2_Init 0 */
/* USER CODE END OPAMP2_Init 0 */
/* USER CODE BEGIN OPAMP2_Init 1 */
/* USER CODE END OPAMP2_Init 1 */
hopamp2.Instance = OPAMP2;
hopamp2.Init.PowerMode = OPAMP_POWERMODE_NORMAL;
hopamp2.Init.Mode = OPAMP_PGA_MODE;
hopamp2.Init.NonInvertingInput = OPAMP_NONINVERTINGINPUT_IO0;
hopamp2.Init.InternalOutput = ENABLE;
hopamp2.Init.TimerControlledMuxmode = OPAMP_TIMERCONTROLLEDMUXMODE_DISABLE;
hopamp2.Init.PgaConnect = OPAMP_PGA_CONNECT_INVERTINGINPUT_NO;
hopamp2.Init.PgaGain = OPAMP_PGA_GAIN_64_OR_MINUS_63;
hopamp2.Init.UserTrimming = OPAMP_TRIMMING_FACTORY;
if (HAL_OPAMP_Init(&hopamp2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN OPAMP2_Init 2 */
HAL_OPAMP_Start(&hopamp2);
/* USER CODE END OPAMP2_Init 2 */
}
/**
* Enable DMA controller clock
*/
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMAMUX1_CLK_ENABLE();
__HAL_RCC_DMA1_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOF_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin : B1_Pin */
GPIO_InitStruct.Pin = B1_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(B1_GPIO_Port, &GPIO_InitStruct);
/*Configure GPIO pin : LD2_Pin */
GPIO_InitStruct.Pin = LD2_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(LD2_GPIO_Port, &GPIO_InitStruct);
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/