【STM32G491试用】（3）OPAMP

wenyangzeng · 发表于 2021-3-28 21:31:35

【STM32G491试用】（3）OPAMP

STM32G491内置4通道可编程增益放大器，本次使用OPAMP3测试性能。DAC1产生800mV正弦波，从PA4输出，连接到OPAMP3同相输入端PB0，用一条导线连接CN7的32脚和34脚。将示波器连接到OPAMP3_OUT输出端 PB1观察显示波形。
PC13是按键输入口，配置为中断方式，用于改变OPAMP3的增益在2倍到4倍。

DAC1配置

DMA配置

GPIO配置

OPAMP3配置

TIM2配置

main.c

#include "main.h"
#include "dac.h"
#include "dma.h"
#include "usart.h"
#include "opamp.h"
#include "tim.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
__IO uint32_t UserButtonStatus = 0;
const uint16_t Sine12bit[32] = { 511, 611, 707, 796, 873, 937, 984, 1013,
1023, 1013, 984, 937, 873, 796, 707, 611,
511, 412, 315, 227, 149, 86, 38, 9,
0, 9, 38, 86, 149, 227, 315, 412};
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* 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_DMA_Init();
MX_DAC1_Init();
// MX_LPUART1_UART_Init();
MX_TIM2_Init();
MX_OPAMP3_Init();
/* USER CODE BEGIN 2 */
if(HAL_OK != HAL_DAC_Start_DMA(&hdac1, DAC_CHANNEL_1,
(uint32_t*)Sine12bit, 32, DAC_ALIGN_12B_R))
{
/* Start DMA Error */
Error_Handler();
}
if(HAL_OK != HAL_TIM_Base_Start(&htim2))
{
Error_Handler();
}
if(HAL_OK != HAL_OPAMP_Start(&hopamp3))
{
Error_Handler();
}
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
if (UserButtonStatus == 1)
{
HAL_Delay(200);
UserButtonStatus = 0;
/* Change the gain */
if (hopamp3.Init.PgaGain == OPAMP_PGA_GAIN_2_OR_MINUS_1)
{
hopamp3.Init.PgaGain = OPAMP_PGA_GAIN_4_OR_MINUS_3;
}
else
{
hopamp3.Init.PgaGain = OPAMP_PGA_GAIN_2_OR_MINUS_1;
}
/* Update OPAMP config */
/* Gain is changed on the fly */
if(HAL_OK != HAL_OPAMP_Init(&hopamp3))
{
Error_Handler();
}
}
/* 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);
HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
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 buses 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_4) != HAL_OK)
{
Error_Handler();
}
/** Initializes the peripherals clocks
*/
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_LPUART1;
PeriphClkInit.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_PCLK1;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
{
UserButtonStatus = 1;
}
}

复制代码

opamp.C

OPAMP_HandleTypeDef hopamp3;
/* OPAMP3 init function */
void MX_OPAMP3_Init(void)
{
/* USER CODE BEGIN OPAMP3_Init 0 */
/* USER CODE END OPAMP3_Init 0 */
/* USER CODE BEGIN OPAMP3_Init 1 */
/* USER CODE END OPAMP3_Init 1 */
hopamp3.Instance = OPAMP3;
hopamp3.Init.PowerMode = OPAMP_POWERMODE_NORMAL;
hopamp3.Init.Mode = OPAMP_PGA_MODE;
hopamp3.Init.NonInvertingInput = OPAMP_NONINVERTINGINPUT_IO0;
hopamp3.Init.InternalOutput = DISABLE;
hopamp3.Init.TimerControlledMuxmode = OPAMP_TIMERCONTROLLEDMUXMODE_DISABLE;
hopamp3.Init.PgaConnect = OPAMP_PGA_CONNECT_INVERTINGINPUT_NO;
hopamp3.Init.PgaGain = OPAMP_PGA_GAIN_2_OR_MINUS_1;
hopamp3.Init.UserTrimming = OPAMP_TRIMMING_FACTORY;
if (HAL_OPAMP_Init(&hopamp3) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN OPAMP3_Init 2 */
/* USER CODE END OPAMP3_Init 2 */
}
void HAL_OPAMP_MspInit(OPAMP_HandleTypeDef* opampHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(opampHandle->Instance==OPAMP3)
{
/* USER CODE BEGIN OPAMP3_MspInit 0 */
/* USER CODE END OPAMP3_MspInit 0 */
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/**OPAMP3 GPIO Configuration
PA1 ------> OPAMP3_VINP
PB1 ------> OPAMP3_VOUT
*/
GPIO_InitStruct.Pin = GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* USER CODE BEGIN OPAMP3_MspInit 1 */
/* USER CODE END OPAMP3_MspInit 1 */
}
}

复制代码

运行结果

增益2倍

增益4倍

可见这是一款非常适合灵活应用的性价比较高的芯片。

STM32G491_OPAMP.rar (699.72 KB, 下载次数: 14)

caizhiwei · 发表于 2021-3-29 09:33:31

牛~这样的话 BOM成本就能节省一个外部运放了吧？

wenyangzeng · 发表于 2021-3-29 10:01:12

caizhiwei 发表于 2021-3-29 09:33
牛~这样的话 BOM成本就能节省一个外部运放了吧？

是可以节省一个外部运放的。而且可以在运行中改变增益。

epochal · 发表于 2021-3-29 11:20:00

性价比高的芯片

[原创] 【STM32G491试用】（3）OPAMP

STM32粉丝勋章Ⅳ

STM32粉丝勋章Ⅱ

站长推荐 /3