标题: stm32 ADC串口发送源码 通过DMA通道1读取 [打印本页]

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作者: zzxxxxxx    时间: 2018-10-15 15:01
标题: stm32 ADC串口发送源码 通过DMA通道1读取
利用ADC的第14通道对开发板上单圈电位器的电压值作AD转换，采用连续转换模式，转换结果通过DMA通道1读取。ADC转换的结果，每间隔1秒钟向串口发送一次。

单片机源程序如下:

1. /*******************************************************************************
   
2. * File Name          : main.c
   
3. * Author             : Wuhan R&D Center, Embest
   
4. * Description        : Main program body
   
5. ********************************************************************************/
   
6. 
   
7. /* Includes ------------------------------------------------------------------*/
   
8. #include "stm32f10x_lib.h"
   
9. #include"stdio.h"
   
10. 
    
11. /************ 用于定义ITM Viewer相关的ITM激励寄存器端口 ************************/
    
12. #define ITM_Port8(n)    (*((volatile unsigned char *)(0xE0000000+4*n)))
    
13. #define ITM_Port16(n)   (*((volatile unsigned short*)(0xE0000000+4*n)))
    
14. #define ITM_Port32(n)   (*((volatile unsigned long *)(0xE0000000+4*n)))
    
15. 
    
16. #define DEMCR           (*((volatile unsigned long *)(0xE000EDFC)))
    
17. #define TRCENA          0x01000000
    
18. 
    
19. /*用于定义是否使用ITM Viewer*/
    
20. //#define DBG_ITM   
    
21. 
    
22. /* Private typedef -----------------------------------------------------------*/
    
23. /* Private define ------------------------------------------------------------*/
    
24. #define ADC1_DR_Address    ((u32)0x4001244C)
    
25. int AD_value;
    
26. static unsigned long ticks;
    
27. unsigned char Clock1s;
    
28. 
    
29. /* Private macro -------------------------------------------------------------*/
    
30. /* Private variables ---------------------------------------------------------*/
    
31. ADC_InitTypeDef ADC_InitStructure;
    
32. DMA_InitTypeDef DMA_InitStructure;
    
33. vu16 ADC_ConvertedValue;
    
34. ErrorStatus HSEStartUpStatus;
    
35.    
    
36. /* Private function prototypes -----------------------------------------------*/
    
37. void RCC_Configuration(void);
    
38. void GPIO_Configuration(void);
    
39. void NVIC_Configuration(void);
    
40. void USART_Configuration1(void);
    
41. void SetupClock (void);
    
42. int fputc(int ch, FILE *f);  
    
43. /* Private functions ---------------------------------------------------------*/
    
44. 
    
45. /*******************************************************************************
    
46. * Function Name  : main
    
47. * Description    : Main program
    
48. * Input          : None
    
49. * Output         : None
    
50. * Return         : None
    
51. *******************************************************************************/
    
52. int main(void)
    
53. {
    
54. #ifdef DEBUG
    
55.   debug();
    
56. #endif
    
57. 
    
58.   /* System clocks configuration ---------------------------------------------*/
    
59.   RCC_Configuration();
    
60. 
    
61.   /* NVIC configuration ------------------------------------------------------*/
    
62.   NVIC_Configuration();
    
63. 
    
64.   /* GPIO configuration ------------------------------------------------------*/
    
65.   GPIO_Configuration();
    
66.    
    
67.    /* Configure the USART1 */
    
68.   USART_Configuration1();
    
69. 
    
70.   printf("\r\n USART1 print AD_value -------------------------- \r\n");
    
71. 
    
72.   /* DMA channel1 configuration ----------------------------------------------*/
    
73.   DMA_DeInit(DMA1_Channel1);
    
74.   DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
    
75.   DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue;
    
76.   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    
77.   DMA_InitStructure.DMA_BufferSize = 1;
    
78.   DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    
79.   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
    
80.   DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    
81.   DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    
82.   DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    
83.   DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    
84.   DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    
85.   DMA_Init(DMA1_Channel1, &DMA_InitStructure);
    
86.   
    
87.   /* Enable DMA channel1 */
    
88.   DMA_Cmd(DMA1_Channel1, ENABLE);
    
89.      
    
90.   /* ADC1 configuration ------------------------------------------------------*/
    
91.   ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    
92.   ADC_InitStructure.ADC_ScanConvMode = ENABLE;
    
93.   ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    
94.   ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    
95.   ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    
96.   ADC_InitStructure.ADC_NbrOfChannel = 1;
    
97.   ADC_Init(ADC1, &ADC_InitStructure);
    
98. 
    
99.   /* ADC1 regular channel14 configuration */
    
100.   ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_55Cycles5);
     
101. 
     
102.   /* Enable ADC1 DMA */
     
103.   ADC_DMACmd(ADC1, ENABLE);
     
104.   
     
105.   /* Enable ADC1 */
     
106.   ADC_Cmd(ADC1, ENABLE);
     
107. 
     
108.   /* Enable ADC1 reset calibaration register */   
     
109.   ADC_ResetCalibration(ADC1);
     
110.   /* Check the end of ADC1 reset calibration register */
     
111.   while(ADC_GetResetCalibrationStatus(ADC1));
     
112. 
     
113.   /* Start ADC1 calibaration */
     
114.   ADC_StartCalibration(ADC1);
     
115.   /* Check the end of ADC1 calibration */
     
116.   while(ADC_GetCalibrationStatus(ADC1));
     
117.      
     
118.   /* Start ADC1 Software Conversion */
     
119.   ADC_SoftwareStartConvCmd(ADC1, ENABLE);    /*使能ADC1软件开始转换*/
     
120. 
     
121. while(1)
     
122.   {
     
123.   AD_value=ADC_GetConversionValue(ADC1);
     
124.    if (ticks++ >= 900000) {                  /* Set Clock1s to 1 every 1 second    */
     
125.     ticks   = 0;
     
126.     Clock1s = 1;
     
127.   }
     
128. 
     
129.    /* Printf message with AD value to serial port every 1 second             */
     
130.     if (Clock1s) {
     
131.       Clock1s = 0;
     
132.       printf("The current AD value = 0x%04X \r\n", AD_value);
     
133.     }
     
134.   
     
135.   }
     
136. }
     
137. 
     
138. /*******************************************************************************
     
139. * Function Name  : RCC_Configuration
     
140. * Description    : Configures the different system clocks.
     
141. * Input          : None
     
142. * Output         : None
     
143. * Return         : None
     
144. *******************************************************************************/
     
145. void RCC_Configuration(void)
     
146. {
     
147.   /* RCC system reset(for debug purpose) */
     
148.   RCC_DeInit();
     
149. 
     
150.   /* Enable HSE */
     
151.   RCC_HSEConfig(RCC_HSE_ON);
     
152. 
     
153.   /* Wait till HSE is ready */
     
154.   HSEStartUpStatus = RCC_WaitForHSEStartUp();
     
155. 
     
156.   if(HSEStartUpStatus == SUCCESS)
     
157.   {
     
158.     /* HCLK = SYSCLK */
     
159.     RCC_HCLKConfig(RCC_SYSCLK_Div1);
     
160.   
     
161.     /* PCLK2 = HCLK */
     
162.     RCC_PCLK2Config(RCC_HCLK_Div1);
     
163. 
     
164.     /* PCLK1 = HCLK/2 */
     
165.     RCC_PCLK1Config(RCC_HCLK_Div2);
     
166. 
     
167.     /* ADCCLK = PCLK2/4 */
     
168.     RCC_ADCCLKConfig(RCC_PCLK2_Div4);
     
169.   
     
170.     /* Flash 2 wait state */
     
171.     FLASH_SetLatency(FLASH_Latency_2);         /*设置代码延时值（参数里的是指2延时周期）*/
     
172.     /* Enable Prefetch Buffer */
     
173.     FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);      /*使能或者失能预取指缓存*/
     
174. 
     
175.     /* PLLCLK = 8MHz * 9 = 56 MHz */
     
176.     RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
     
177. 
     
178.     /* Enable PLL */
     
179.     RCC_PLLCmd(ENABLE);
     
180. 
     
181.     /* Wait till PLL is ready */
     
182.     while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
     
183.     {
     
184.     }
     
185. 
     
186.     /* Select PLL as system clock source */
     
187.     RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
     
188. 
     
189.     /* Wait till PLL is used as system clock source */
     
190.     while(RCC_GetSYSCLKSource() != 0x08)
     
191.     {
     
192.     }
     
193.   }
     
194. 
     
195. /* Enable peripheral clocks --------------------------------------------------*/
     
196.   /* Enable DMA clock */
     
197.   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
     
198. 
     
199.   /* Enable ADC1 and GPIOC clock */
     
200.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOC, ENABLE);
     
201. 
     
202.   /* Enable USART1 and GPIOA clock */
     
203.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
     
204. }
     
205. 
     
206. /*******************************************************************************
     
207. * Function Name  : GPIO_Configuration
     
208. * Description    : Configures the different GPIO ports.
     
209. * Input          : None
     
210. * Output         : None
     
211. * Return         : None
     
212. *******************************************************************************/
     
213. void GPIO_Configuration(void)
     
214. {
     
215.   GPIO_InitTypeDef GPIO_InitStructure;
     
216. 
     
217.   /* Configure PC.04 (ADC Channel14) as analog input -------------------------*/
     
218.   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
     
219.   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
     
220.   GPIO_Init(GPIOA, &GPIO_InitStructure);
     
221. 
     
222.    /* Configure USART1 Tx (PA.09) as alternate function push-pull */
     
223.   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
     
224.   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
     
225.   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
     
226.   GPIO_Init(GPIOA, &GPIO_InitStructure);
     
227.    
     
228.   /* Configure USART1 Rx (PA.10) as input floating */
     
229.   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
     
230.   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     
231.   GPIO_Init(GPIOA, &GPIO_InitStructure);
     
232. 
     
233. }
     
234. 
     
235. /*******************************************************************************
     
236. * Function Name  : NVIC_Configuration
     
237. * Description    : Configures Vector Table base location.
     
238. * Input          : None
     
239. * Output         : None
     
240. * Return         : None
     
241. *******************************************************************************/
     
242. void NVIC_Configuration(void)
     
243. {
     
244. #ifdef  VECT_TAB_RAM  
     
245.   /* Set the Vector Table base location at 0x20000000 */
     
246.   NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
     
247. #else  /* VECT_TAB_FLASH  */
     
248.   /* Set the Vector Table base location at 0x08000000 */
     
249.   NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);   
     
250. #endif
     
251. }
     
252. 
     
253. #ifdef  DEBUG
     
254. /*******************************************************************************
     
255. * Function Name  : assert_failed
     
256. * Description    : Reports the name of the source file and the source line number
     
257. *                  where the assert error has occurred.
     
258. * Input          : - file: pointer to the source file name
     
259. *                  - line: assert error line source number
     
260. * Output         : None
     
261. * Return         : None
     
262. *******************************************************************************/
     
263. void assert_failed(u8* file, u32 line)
     
264. {
     
265.   /* User can add his own implementation to report the file name and line number,
     
266.      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
     
267. 
     
268.   /* Infinite loop */
     
269.   while (1)
     
270.   {
     
271.   }
     
272. }
     
273. #endif
     
274. /*******************************************************************************
     
275. * Function Name  : USART_Configuration
     
276. * Description    : Configures the USART1.
     
277. * Input          : None
     
278. * Output         : None
     
279. * Return         : None
     
280. *******************************************************************************/
     
281. void USART_Configuration1(void)
     
282. {
     
283.   USART_InitTypeDef USART_InitStructure;
     
284.   USART_ClockInitTypeDef  USART_ClockInitStructure;
     
285. /* USART1 configuration ------------------------------------------------------*/
     
286.   /* USART1 configured as follow:
     
287.         - BaudRate = 115200 baud  
     
288.         - Word Length = 8 Bits
     
289.         - One Stop Bit
     
290.         - No parity
     
291.         - Hardware flow control disabled (RTS and CTS signals)
     
292.         - Receive and transmit enabled
     
293.         - USART Clock disabled
     
294.         - USART CPOL: Clock is active low
     
295.         - USART CPHA: Data is captured on the middle
     
296.         - USART LastBit: The clock pulse of the last data bit is not output to
     
297.                          the SCLK pin
     
298.   */
     
299.   USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
     
300. USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
     
301. USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
     
302. USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
     
303. /* Configure the USART1 synchronous paramters */
     
304. USART_ClockInit(USART1, &USART_ClockInitStructure);
     
305. 
     
306. USART_InitStructure.USART_BaudRate = 115200;
     
307. USART_InitStructure.USART_WordLength = USART_WordLength_8b;
     
308. USART_InitStructure.USART_StopBits = USART_StopBits_1;
     
309. USART_InitStructure.USART_Parity = USART_Parity_No ;
     
310. USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
     
311. 
     
312. 
     
313. USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
     
314. /* Configure USART1 basic and asynchronous paramters */
     
315. USART_Init(USART1, &USART_InitStructure);
     
316.   /* Enable USART1 */
     
317.   USART_Cmd(USART1, ENABLE);
     
318. }
     
319. 
     
320. /*******************************************************************************
     
321. * Function Name  : fputc
     
322. * Description    : Retargets the C library printf function to the USART or ITM Viewer.
     
323. * Input          : None
     
324. * Output         : None
     
325. * Return         : None
     
326. *******************************************************************************/
     
327. 
     
328. int fputc(int ch, FILE *f)
     
329. {
     
330. #ifdef DBG_ITM
     
331. /* 将Printf内容发往ITM激励寄存器端口  */
     
332.   if (DEMCR & TRCENA) {
     
333.     while (ITM_Port32(0) == 0);
     
334.     ITM_Port8(0) = ch;
     
335.   }
     
336. #else  
     
337. /* 将Printf内容发往串口 */
     
338.   USART_SendData(USART1, (unsigned char) ch);
     
339.   while (!(USART1->SR & USART_FLAG_TXE));
     
340. #endif  
     
341.   return (ch);
     
342. }
     
343. 
     
344. 
     
345. /******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/
     

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