STM32G491评测（2）DAC
STM32G491内置4通道12位DAC。配合DMA可以高效产生各种波形，
本次评测试用DAC通道1配合DMA数据传输，以查表方式产生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通道参数



配置DMA参数



使能TIM2


使能TIM6


生成MDK工程
要产生正弦波，需要在MX_DAC1_Init()函数末尾添加代码：

1. if (HAL_DACEx_SelfCalibrate(&hdac1, &sConfig, DAC_CHANNEL_1) != HAL_OK)
   
2.   {
   
3.     Error_Handler();
   
4.   }
   
5.         sDacConfig = sConfig;
   

复制代码

main()函数添加代码

1. #include "main.h"
   
2. #include "dac.h"
   
3. #include "dma.h"
   
4. #include "tim.h"
   
5. #include "gpio.h"
   
6. 
   
7. /* Private includes ----------------------------------------------------------*/
   
8. /* USER CODE BEGIN Includes */
   
9. 
   
10. /* USER CODE END Includes */
    
11. 
    
12. /* Private typedef -----------------------------------------------------------*/
    
13. /* USER CODE BEGIN PTD */
    
14. typedef enum
    
15. {
    
16.         DAC_WAVE_SAWTOOTH,
    
17.         DAC_WAVE_SINE
    
18. 
    
19.   
    
20. } t_wavetype;
    
21. /* USER CODE END PTD */
    
22. 
    
23. /* Private define ------------------------------------------------------------*/
    
24. /* USER CODE BEGIN PD */
    
25. /* USER CODE END PD */
    
26. 
    
27. /* Private macro -------------------------------------------------------------*/
    
28. /* USER CODE BEGIN PM */
    
29. 
    
30. /* USER CODE END PM */
    
31. 
    
32. /* Private variables ---------------------------------------------------------*/
    
33. 
    
34. /* USER CODE BEGIN PV */
    
35. __IO uint8_t ubKeyPressed = RESET;
    
36. __IO t_wavetype ubSelectedWavesForm = DAC_WAVE_SINE;
    
37. /* USER CODE END PV */
    
38. 
    
39. /* Private function prototypes -----------------------------------------------*/
    
40. void SystemClock_Config(void);
    
41. /* USER CODE BEGIN PFP */
    
42. #define SAWTOOTH_NB_STEPS  60
    
43. 
    
44. uint16_t sinewave[60] = {
    
45. 0x07ff,0x08cb,0x0994,0x0a5a,0x0b18,0x0bce,0x0c79,0x0d18,0x0da8,0x0e29,0x0e98,0x0ef4,0x0f3e,0x0f72,0x0f92,0x0f9d,
    
46. 0x0f92,0x0f72,0x0f3e,0x0ef4,0x0e98,0x0e29,0x0da8,0x0d18,0x0c79,0x0bce,0x0b18,0x0a5a,0x0994,0x08cb,0x07ff,0x0733,
    
47. 0x066a,0x05a4,0x04e6,0x0430,0x0385,0x02e6,0x0256,0x01d5,0x0166,0x010a,0x00c0,0x008c,0x006c,0x0061,0x006c,0x008c,
    
48. 0x00c0,0x010a,0x0166,0x01d5,0x0256,0x02e6,0x0385,0x0430,0x04e6,0x05a4,0x066a,0x0733};
    
49. 
    
50. DAC_ChannelConfTypeDef sDacConfig = {0};
    
51. static void DAC_ChangeWave(t_wavetype wave);
    
52. 
    
53. /* USER CODE END PFP */
    
54. 
    
55. /* Private user code ---------------------------------------------------------*/
    
56. /* USER CODE BEGIN 0 */
    
57. 
    
58. /* USER CODE END 0 */
    
59. 
    
60. 
    
61. int main(void)
    
62. {
    
63.   /* USER CODE BEGIN 1 */
    
64. 
    
65.   /* USER CODE END 1 */
    
66. 
    
67.   /* MCU Configuration--------------------------------------------------------*/
    
68. 
    
69.   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
    
70.   HAL_Init();
    
71. 
    
72.   /* USER CODE BEGIN Init */
    
73. 
    
74.   /* USER CODE END Init */
    
75. 
    
76.   /* Configure the system clock */
    
77.   SystemClock_Config();
    
78. 
    
79.   /* USER CODE BEGIN SysInit */
    
80. 
    
81.   /* USER CODE END SysInit */
    
82. 
    
83.   /* Initialize all configured peripherals */
    
84.   MX_GPIO_Init();
    
85.   MX_DMA_Init();
    
86.   MX_DAC1_Init();
    
87.   MX_TIM2_Init();
    
88.   MX_TIM6_Init();
    
89.   /* USER CODE BEGIN 2 */
    
90. 
    
91.   if (HAL_TIM_Base_Start(&htim6) != HAL_OK)
    
92.   {
    
93.     Error_Handler();
    
94.   }
    
95. 
    
96.         ubSelectedWavesForm = DAC_WAVE_SINE;
    
97.         DAC_ChangeWave(ubSelectedWavesForm);
    
98. 
    
99.   while (1)
    
100.   {
     
101. 
     
102.     /* USER CODE END WHILE */
     
103. 
     
104.     /* USER CODE BEGIN 3 */
     
105.   }
     
106.   /* USER CODE END 3 */
     
107. }
     
108. 
     
109. /**
     
110.   * @brief System Clock Configuration
     
111.   * @retval None
     
112.   */
     
113. void SystemClock_Config(void)
     
114. {
     
115.   RCC_OscInitTypeDef RCC_OscInitStruct = {0};
     
116.   RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
     
117. 
     
118.   /** Configure the main internal regulator output voltage
     
119.   */
     
120.   HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
     
121.   /** Initializes the RCC Oscillators according to the specified parameters
     
122.   * in the RCC_OscInitTypeDef structure.
     
123.   */
     
124.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
     
125.   RCC_OscInitStruct.HSIState = RCC_HSI_ON;
     
126.   RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
     
127.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
     
128.   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
     
129.   RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV4;
     
130.   RCC_OscInitStruct.PLL.PLLN = 75;
     
131.   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
     
132.   RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
     
133.   RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
     
134.   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
     
135.   {
     
136.     Error_Handler();
     
137.   }
     
138.   /** Initializes the CPU, AHB and APB buses clocks
     
139.   */
     
140.   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
     
141.                               |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
     
142.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
     
143.   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
     
144.   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
     
145.   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
     
146. 
     
147.   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
     
148.   {
     
149.     Error_Handler();
     
150.   }
     
151. }
     
152. 
     
153. /* USER CODE BEGIN 4 */
     
154. static void DAC_ChangeWave(t_wavetype wave)
     
155. {
     
156.   uint32_t tmp;
     
157.   
     
158.   /* Suspend Time Base triggers */
     
159.   if (HAL_TIM_Base_Stop(&htim2) != HAL_OK)
     
160.   {
     
161.     /* Counter enable error */
     
162.     Error_Handler();
     
163.   }
     
164.   if (HAL_TIM_Base_Stop(&htim6) != HAL_OK)
     
165.   {
     
166.     /* Counter enable error */
     
167.     Error_Handler();
     
168.   }
     
169.   
     
170.   switch(wave)
     
171.   {
     
172.     case DAC_WAVE_SAWTOOTH:
     
173.       if (HAL_DAC_Stop_DMA(&hdac1, DAC_CHANNEL_1) != HAL_OK)
     
174.       {
     
175.         /* DAC conversion start error */
     
176.         Error_Handler();
     
177.       }
     
178.       break;
     
179.     case DAC_WAVE_SINE:
     
180.       if (HAL_DAC_Stop(&hdac1, DAC_CHANNEL_1) != HAL_OK)
     
181.       {
     
182.         /* DAC conversion start error */
     
183.         Error_Handler();
     
184.       }
     
185.       break;
     
186.     default:
     
187.       Error_Handler();
     
188.       break;
     
189.   }
     
190. 
     
191.   /* Re-configure DAC */
     
192.   tmp = sDacConfig.DAC_Trigger;
     
193.   sDacConfig.DAC_Trigger = sDacConfig.DAC_Trigger2;
     
194.   sDacConfig.DAC_Trigger2 = tmp;
     
195.   if (HAL_DAC_ConfigChannel(&hdac1, &sDacConfig, DAC_CHANNEL_1) != HAL_OK)
     
196.   {
     
197.     Error_Handler();
     
198.   }
     
199.   
     
200.   /* Generate new wave */
     
201.   switch(wave)
     
202.   {
     
203.     case DAC_WAVE_SAWTOOTH:
     
204.       if (HAL_DACEx_SawtoothWaveGenerate(&hdac1, DAC_CHANNEL_1, DAC_SAWTOOTH_POLARITY_INCREMENT, 0, 0x10000/SAWTOOTH_NB_STEPS) != HAL_OK)
     
205.       {
     
206.         Error_Handler();
     
207.       }
     
208.       if (HAL_DAC_Start(&hdac1, DAC_CHANNEL_1) != HAL_OK)
     
209.       {
     
210.         /* DAC conversion start error */
     
211.         Error_Handler();
     
212.       }
     
213.       break;
     
214.     case DAC_WAVE_SINE:
     
215.       if (HAL_DAC_Start_DMA(&hdac1, DAC_CHANNEL_1,
     
216.                             (uint32_t *)sinewave,
     
217.                             60,
     
218.                             DAC_ALIGN_12B_R
     
219.                            ) != HAL_OK)
     
220.       {
     
221.         /* DAC conversion start error */
     
222.         Error_Handler();
     
223.       }
     
224.       break;
     
225.     default:
     
226.       Error_Handler();
     
227.       break;
     
228.   }
     
229.   
     
230.   /* Resume Time Base triggers */
     
231.   if (HAL_TIM_Base_Start(&htim2) != HAL_OK)
     
232.   {
     
233.     /* Counter enable error */
     
234.     Error_Handler();
     
235.   }
     
236.   if (HAL_TIM_Base_Start(&htim6) != HAL_OK)
     
237.   {
     
238.     /* Counter enable error */
     
239.     Error_Handler();
     
240.   }
     
241. }

复制代码

运行结果

STM32G491DAC.rar (637 KB, 下载次数: 13)

2021-3-22 21:30 上传

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提交几次一直提示系统忙，未能成功，提交了几个空帖子，管理员帮忙删除一下。
https://shequ.stmicroelectronics.cn/forum.php?mod=viewthread&tid=629658&extra=page%3D1%26filter%3Dsortid%26orderby%3Dlastpost%26sortid%3D8

https://shequ.stmicroelectronics.cn/forum.php?mod=viewthread&tid=629659&extra=page%3D1%26filter%3Dsortid%26orderby%3Dlastpost%26sortid%3D8