【STM32G491试用】（2）DAC

wenyangzeng · 发表于 2021-3-20 21:06:35

STM32G491试用（2）DAC

STM32G491内置4通道12位DAC，配合DMA,可以非常方便产生各种波形。
本评测使用DAC1通道1配合DMA数据传输，查表方式产生1KHZ正弦波。

在CubeMX中选择STM32G491芯片，配置系统时钟150MHZ：

使能DAC1

配置DAC1通道

配置DMA

使能Tim2

使能Tim6

生成MDK工程。
要产生正弦波，还需要在函数 MX_DAC1_Init()的末尾增加代码：

if (HAL_DACEx_SelfCalibrate(&hdac1, &sConfig, DAC_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
sDacConfig = sConfig;

复制代码

在main.c函数中添加代码

#include "main.h"
#include "dac.h"
#include "dma.h"
#include "tim.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
typedef enum
{
DAC_WAVE_SAWTOOTH,
DAC_WAVE_SINE
} t_wavetype;
/* 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 */
__IO uint8_t ubKeyPressed = RESET;
__IO t_wavetype ubSelectedWavesForm = DAC_WAVE_SINE;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
#define SAWTOOTH_NB_STEPS 60
uint16_t sinewave[60] = {
0x07ff,0x08cb,0x0994,0x0a5a,0x0b18,0x0bce,0x0c79,0x0d18,0x0da8,0x0e29,0x0e98,0x0ef4,0x0f3e,0x0f72,0x0f92,0x0f9d,
0x0f92,0x0f72,0x0f3e,0x0ef4,0x0e98,0x0e29,0x0da8,0x0d18,0x0c79,0x0bce,0x0b18,0x0a5a,0x0994,0x08cb,0x07ff,0x0733,
0x066a,0x05a4,0x04e6,0x0430,0x0385,0x02e6,0x0256,0x01d5,0x0166,0x010a,0x00c0,0x008c,0x006c,0x0061,0x006c,0x008c,
0x00c0,0x010a,0x0166,0x01d5,0x0256,0x02e6,0x0385,0x0430,0x04e6,0x05a4,0x066a,0x0733};
DAC_ChannelConfTypeDef sDacConfig = {0};
static void DAC_ChangeWave(t_wavetype wave);
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
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_TIM2_Init();
MX_TIM6_Init();
/* USER CODE BEGIN 2 */
if (HAL_TIM_Base_Start(&htim6) != HAL_OK)
{
Error_Handler();
}
ubSelectedWavesForm = DAC_WAVE_SINE;
DAC_ChangeWave(ubSelectedWavesForm);
while (1)
{
/* 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};
/** Configure the main internal regulator output voltage
*/
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 = 75;
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();
}
}
/* USER CODE BEGIN 4 */
static void DAC_ChangeWave(t_wavetype wave)
{
uint32_t tmp;
/* Suspend Time Base triggers */
if (HAL_TIM_Base_Stop(&htim2) != HAL_OK)
{
/* Counter enable error */
Error_Handler();
}
if (HAL_TIM_Base_Stop(&htim6) != HAL_OK)
{
/* Counter enable error */
Error_Handler();
}
switch(wave)
{
case DAC_WAVE_SAWTOOTH:
if (HAL_DAC_Stop_DMA(&hdac1, DAC_CHANNEL_1) != HAL_OK)
{
/* DAC conversion start error */
Error_Handler();
}
break;
case DAC_WAVE_SINE:
if (HAL_DAC_Stop(&hdac1, DAC_CHANNEL_1) != HAL_OK)
{
/* DAC conversion start error */
Error_Handler();
}
break;
default:
Error_Handler();
break;
}
/* Re-configure DAC */
tmp = sDacConfig.DAC_Trigger;
sDacConfig.DAC_Trigger = sDacConfig.DAC_Trigger2;
sDacConfig.DAC_Trigger2 = tmp;
if (HAL_DAC_ConfigChannel(&hdac1, &sDacConfig, DAC_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
/* Generate new wave */
switch(wave)
{
case DAC_WAVE_SAWTOOTH:
if (HAL_DACEx_SawtoothWaveGenerate(&hdac1, DAC_CHANNEL_1, DAC_SAWTOOTH_POLARITY_INCREMENT, 0, 0x10000/SAWTOOTH_NB_STEPS) != HAL_OK)
{
Error_Handler();
}
if (HAL_DAC_Start(&hdac1, DAC_CHANNEL_1) != HAL_OK)
{
/* DAC conversion start error */
Error_Handler();
}
break;
case DAC_WAVE_SINE:
if (HAL_DAC_Start_DMA(&hdac1, DAC_CHANNEL_1,
(uint32_t *)sinewave,
60,
DAC_ALIGN_12B_R
) != HAL_OK)
{
/* DAC conversion start error */
Error_Handler();
}
break;
default:
Error_Handler();
break;
}
/* Resume Time Base triggers */
if (HAL_TIM_Base_Start(&htim2) != HAL_OK)
{
/* Counter enable error */
Error_Handler();
}
if (HAL_TIM_Base_Start(&htim6) != HAL_OK)
{
/* Counter enable error */
Error_Handler();
}
}

复制代码

运行结果

由于采用DMA传输正弦波查表数据，效率非常高。

STMCU · 发表于 2021-3-22 09:21:28

亲爱的网友你好，由于ST新社区已上线（https://shequ.stmicroelectronics.cn/）请至新社区发布新的主题帖。

wenyangzeng · 发表于 2021-3-22 13:02:20

STMCU 发表于 2021-3-22 09:21
亲爱的网友你好，由于ST新社区已上线（https://shequ.stmicroelectronics.cn/）请至新社区发布新的主题帖。 ...

回复管管：那个什么新社区根本找不到发帖的入口

发帖居然是从提问栏进去的？

然后呢？然后进去一番操作，点击提交，却被告知系统忙。自动退出，操作3次均告失败。

Kevin201707 · 发表于 2021-3-22 20:26:48

工程共享下呗，按代码在G474上没跑起来。

wenyangzeng · 发表于 2021-3-22 21:24:30

Kevin201707 发表于 2021-3-22 20:26
工程共享下呗，按代码在G474上没跑起来。

STM32G491DAC.rar (637 KB, 下载次数: 7)

Kevin201707 · 发表于 2021-3-23 09:27:13

wenyangzeng 发表于 2021-3-22 21:24
还是习惯在老社区，方便多了！

多谢作者，我测试下。

Kevin201707 · 发表于 2021-3-23 16:09:21

Kevin201707 发表于 2021-3-23 09:27
多谢作者，我测试下。

同样的代码，MDK编译运行正常，STM32CubeIDE无法运行。

[原创] 【STM32G491试用】（2）DAC

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