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40系统时钟滴答

tuhyj
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2014-12-25 23:40:53     打赏
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  1. #include "stm32f10x.h"
  2. #include "stm32_eval.h"
  3. #include
  5. volatile int flag;
  6. #define Set_B20() GPIO_SetBits(GPIOC, GPIO_Pin_12) //上拉关闭PC12
  7. #define Reset_B20() GPIO_ResetBits(GPIOC, GPIO_Pin_12) //下拉打开PC12
  8. #define Read_B20() GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_12) //读PC12状态
  9. unsigned char Error_Flag=0;
  10. unsigned char zf=0;
  11. void SysTick_Configuration(void)
  12. {
  13. /* Setup SysTick Timer for 10 msec interrupts */
  14. if (SysTick_Config(48000)) //SysTick配置
  15. {
  16. /* Capture error */
  17. while (1);
  18. }
  19. /* Configure the SysTick handler priority */
  20. NVIC_SetPriority(SysTick_IRQn, 0x0); //SysTick中断优先级
  21. }
  24. /** @addtogroup STM32F10x_StdPeriph_Examples
  25. * @{
  26. */
  28. /** @addtogroup EXTI_Config
  29. * @{
  30. */
  32. /* Private typedef -----------------------------------------------------------*/
  33. /* Private define ------------------------------------------------------------*/
  34. /* Private macro -------------------------------------------------------------*/
  35. /* Private variables ---------------------------------------------------------*/
  36. GPIO_InitTypeDef GPIO_InitStructure; //结构体的命名
  37. USART_InitTypeDef USART_InitStructure; //结构体的命名
  38. USART_ClockInitTypeDef USART_ClockInitStructure; //结构体的命名
  40. void RCC_Configuration(void)
  41. {
  42. RCC_DeInit(); //将外设RCC的所有寄存器重新设为缺省值
  44. RCC_HSICmd(ENABLE); //使能内部高速晶振
  45. while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET); //当SHI晶振就绪则重新设定
  47. RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI); //设置系统时钟，选择SHI时钟为系统时钟
  49. RCC_HSEConfig(RCC_HSE_OFF); //设置外部高速晶振，HSE晶振OFF
  50. RCC_LSEConfig(RCC_LSE_OFF); //设置外部低速晶振，LSE晶振OFF
  52. //******配置PLL时钟频率为48MHZ*******//
  54. RCC_PLLConfig(RCC_PLLSource_HSI_Div2,RCC_PLLMul_8); //RCC_PLLMul_x 即设置PLL时钟频率为 6*x MHz
  56. //************************************//
  58. RCC_PLLCmd(ENABLE); ////*******************使能PLL
  59. while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET); //PLL就绪
  60. RCC_ADCCLKConfig(RCC_PCLK2_Div4); // ADC时钟=PCLK/2
  61. RCC_PCLK2Config(RCC_HCLK_Div1); // APB2时钟=HCLK
  62. RCC_PCLK1Config(RCC_HCLK_Div2); /// APB1时钟=HCLK/2
  63. RCC_HCLKConfig(RCC_SYSCLK_Div1); // AHB时钟=系统时钟
  64. RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); // 选择PLL为系统时钟
  65. while(RCC_GetSYSCLKSource() != 0x08); //当PLL不是系统时钟
  68. // SystemInit();
  70. RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE); //使能APB2外设时钟/****GPIOD时钟和功能复用IO时钟***/
  71. GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);//disable JTAG SW_DP使能
  72. RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE);
  73. GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);//disable JTAG
  74. GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; // //选择设置GPIO管脚
  75. GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; ////设置管脚速率
  76. GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; ////设置管脚工作状态，此为推挽输出
  77. GPIO_Init(GPIOD, &GPIO_InitStructure); //初始化GPIOD
  78. GPIO_ResetBits(GPIOD,GPIO_Pin_2); //上拉关闭蜂鸣器
  79. RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE);
  80. GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);//disable JTAG
  81. GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;//LED
  82. GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  83. GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  84. GPIO_Init(GPIOC, &GPIO_InitStructure);
  85. GPIO_SetBits(GPIOC,GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7); // GPIOC.0到GPIOC.7输出胃叩缙姜
  86. RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能TIM2时钟
  87. }
  89. void USART_int(long BaudRate)
  90. {
  91. RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);//使能GPIOA、USART1外设时钟
  92. GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  93. GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //GPIO的输出速率为50MHz
  94. GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  95. GPIO_Init(GPIOA, &GPIO_InitStructure);
  96. /* PA10 USART1_Rx */
  97. GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  98. GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //使能外设GPIOC端口时钟
  99. GPIO_Init(GPIOA, &GPIO_InitStructure);
  100. /* USARTx configured as follow:
  101. - BaudRate = 115200 baud
  102. - Word Length = 8 Bits
  103. - One Stop Bit
  104. - No parity
  105. - Hardware flow control disabled (RTS and CTS signals)
  106. - Receive and transmit enabled
  107. */
  108. USART_InitStructure.USART_BaudRate = BaudRate;//设置USART传输波特率 BaudRate = 9600 可以直接写9600
  109. USART_InitStructure.USART_WordLength = USART_WordLength_8b;//一帧传输或者接收的数据位数为8bit
  110. USART_InitStructure.USART_StopBits = USART_StopBits_1;//在帧结尾传输一个停止位
  111. USART_InitStructure.USART_Parity = USART_Parity_No;//奇偶模式失能
  112. USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//硬件流控制失能
  113. USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//使能接收发模式
  114. USART_ClockInitStructure.USART_Clock = USART_Clock_Disable; //时钟低电平活动
  115. USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low; //引脚时钟输出低电平时钟
  116. USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge; //第二个时钟边沿开始捕获数据
  117. USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;//最后一位数据的时钟脉冲不从SCLK输出
  118. USART_ClockInit(USART1, &USART_ClockInitStructure); //引用结构体的成员
  119. USART_Init(USART1, &USART_InitStructure);//USART1初始化
  120. USART_Cmd(USART1, ENABLE);//使能USART1时钟外设
  121. USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//使能接受中断
  122. USART_Cmd(USART1, ENABLE); //使能 USART
  123. }
  125. void delay_18b20(u32 nus) //18b20按照严格的时序工作，这是特定的一个延时函数（自定义）
  126. {
  127. u16 i;
  128. while(nus--)
  129. for(i=12;i>0;i--);
  130. }
  134. void Init18B20(void) //18B20初始化
  135. {
  136. u8 aa=0;
  137. u8 count =0;
  138. RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);//使能PC时钟
  139. GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; //配置端口GPIOC.12
  140. GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;//开漏输出
  141. GPIO_Init(GPIOC, &GPIO_InitStructure); //引用结构体的变量
  142. Set_B20() ; // GPIO_SetBits(GPIOC, GPIO_Pin_12)
  143. delay_18b20(1);
  144. Reset_B20(); //重置18B20
  147. delay_18b20(480);
  148. Set_B20();
  149. // delay_18b20(500);
  150. delay_18b20(480);
  152. count=0;
  153. aa=Read_B20(); //温度读取
  154. /****个人认为限制温度不超过99度，作为一个保护*/
  155. while(!aa && count<100) //判断aa的非和计数器count的值是否都小于100
  156. {
  157. aa=Read_B20(); //
  158. count++; //count自加1
  159. }
  160. if(count>=99)
  161. Error_Flag=1; //错误返回值1
  162. else
  163. Error_Flag=0; //错误返回值0
  165. }
  167. unsigned char Read18B20(void)//按位读取数据
  168. {
  169. unsigned char i=0;
  170. unsigned char date=0;
  171. u8 tempp;
  172. for(i=8;i>0;i--)
  173. {
  175. Reset_B20(); //打开PC12
  176. date>>=1; //标志右移一位
  177. delay_18b20(1);
  178. Set_B20(); //关闭
  179. delay_18b20(1);
  180. tempp=Read_B20(); //读取温度
  182. if(tempp) //判断tempp是否为1
  183. date|=0x80; // 1000 0000 将最高位填1 ，然后右移，每次最高位由0变1，使8位全部传递完毕 0xff = 1111 1111
  184. delay_18b20(60); //延时
  185. }
  186. return(date); //返回值是无符号的字符型的类型 date
  187. }
  188. void Write18B20(unsigned char date)//向18b20写数据
  189. {
  190. unsigned char i=0;
  192. for (i=8; i>0; i--)
  193. {
  194. Reset_B20();
  195. delay_18b20(1);
  196. if(date & 0x01)
  197. {
  198. Set_B20();
  199. }
  200. else
  201. { Reset_B20();}
  202. delay_18b20(60);
  203. date>>=1;
  204. Set_B20();
  205. delay_18b20(1);
  207. }
  208. delay_18b20(15);
  209. }
  211. float Read_T()//读温度
  212. {
  213. unsigned char TUp,TDown;
  214. unsigned char fTemp;
  215. u8 TT=0;
  217. float Temp = 0;
  218. Init18B20();
  219. Write18B20(0xcc);
  220. Write18B20(0x44);
  221. Init18B20();
  222. Write18B20(0xcc);
  223. Write18B20(0xbe);
  224. TDown = Read18B20();
  225. TUp = Read18B20();
  227. if(TUp>0x7f)
  228. {
  229. TDown=~TDown;
  230. TUp=~TUp+1;
  231. TUp/=8;
  232. zf=1;
  233. }
  234. else
  235. zf=0;
  237. fTemp=TDown&0x0f;
  238. TUp<<=4;
  239. TDown>>=4;
  240. TT=TUp|TDown;
  241. Temp=TT+(float)fTemp/16;
  242. return(Temp);
  243. }
  245. int main(void)
  246. {
  248. /*!< At this stage the microcontroller clock setting is already configured,
  249. this is done through SystemInit() function which is called from startup
  250. file (startup_stm32f10x_xx.s) before to branch to application main.
  251. To reconfigure the default setting of SystemInit() function, refer to
  252. system_stm32f10x.c file
  253. */
  255. /* System Clocks Configuration */
  256. char ID[10]; //定义一个字符型数组，长度为10
  257. int i;
  258. RCC_Configuration(); //配置RCC时钟
  259. USART_int(115200); //波特率的设置
  260. SysTick_Configuration(); //系统滴答时钟的调用
  261. printf(" config done...\r\n"); //打印输出
  262. //delay_ms(1000);
  264. Init18B20(); //初始化18b20；
  265. Write18B20(0x34); //写入读取地址的命令
  266. delay_18b20(20); //延时
  268. while(1)
  269. {
  270. if(flag == 300) //判断flag是否等于300
  271. {
  272. printf(" the ID is:") ;
  273. for(i=0;i<8;i++) //字符不能直接输出，要按位输出
  274. {
  275. ID[i] = Read18B20();//读取地址
  276. printf("%d", ID[i]);//输出地址
  277. }
  278. printf("\r\n") ; //换行
  279. }
  280. if(flag == 500) //判断flag是否等于500
  281. {
  282. printf("The Temperature is:%f\r\n",Read_T());//读取温度并输出
  284. printf("===================================================\r\n");
  285. }
  286. }
  287. }
  291. #ifdef USE_FULL_ASSERT
  293. /**
  294. * @brief Reports the name of the source file and the source line number
  295. * where the assert_param error has occurred.
  296. * @param file: pointer to the source file name
  297. * @param line: assert_param error line source number
  298. * @retval None
  299. */
  300. void assert_failed(uint8_t* file, uint32_t line)
  301. {
  302. /* User can add his own implementation to report the file name and line number,
  303. ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  305. /* Infinite loop */
  306. while (1)
  307. {
  308. }
  309. }
  311. #endif
  313. /**
  314. * @}
  315. */
  317. /**
  318. * @}
  319. */
  321. #ifdef __GNUC__
  322. /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
  323. set to 'Yes') calls __io_putchar() */
  324. #define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
  325. #else
  326. #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
  327. #endif /* __GNUC__ */
  331. /**
  332. * @brief Retargets the C library printf function to the USART.
  333. * @param None
  334. * @retval None
  335. */
  336. PUTCHAR_PROTOTYPE
  337. {
  338. /* Place your implementation of fputc here */
  339. /* e.g. write a character to the USART */
  340. USART_SendData(EVAL_COM1, (uint8_t) ch);
  342. /* Loop until the end of transmission */
  343. while (USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TC) == RESET)
  344. {}
  346. return ch;
  347. }
  349. #ifdef USE_FULL_ASSERT
  351. /**
  352. * @brief Reports the name of the source file and the source line number
  353. * where the assert_param error has occurred.
  354. * @param file: pointer to the source file name
  355. * @param line: assert_param error line source number
  356. * @retval None
  357. */
  358. void assert_failed(uint8_t* file, uint32_t line)
  359. {
  360. /* User can add his own implementation to report the file name and line number,
  361. ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  363. /* Infinite loop */
  364. while (1)
  365. {
  366. }
  367. }
  369. #endif
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