標(biāo)題: stm32寄存器的操作實(shí)現(xiàn)外部中斷程序代碼 [打印本頁(yè)]
作者: xuwei    時(shí)間: 2015-6-14 01:54
標(biāo)題: stm32寄存器的操作實(shí)現(xiàn)外部中斷程序代碼
此外部中斷的設(shè)置我完全是采用了寄存器的操作，沒有用一個(gè)庫(kù)函數(shù)來實(shí)現(xiàn)的，這樣做設(shè)置是很慢的，一位一位的校準(zhǔn)，但是我喜歡這樣做。效果如同我想的一樣�。。。。。。。。。�，與天津第四項(xiàng)目部宿舍

  1. #include "stm32f10x.h"
  2. GPIO_InitTypeDef GPIO_InitStructure;
  3. void mysysint();
  4. void my_EXTI_int();
  5. int main(void)
  6. {
  7. mysysint();//RCC初始化，時(shí)鐘設(shè)置72MHZ
  8.    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);//使能APB2時(shí)鐘
  9.    /* Configure PD0 and PD2 in output pushpull mode */
  10.   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9| GPIO_Pin_10| GPIO_Pin_11;
  11.   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  12.   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  13.   GPIO_Init(GPIOD, &GPIO_InitStructure);
  14. my_EXTI_int();
  15. while(1);




  20. }
  21. void my_EXTI_int()//呼呼！
  22. {
  23. /*  PA8被我設(shè)置成輸入,上啦、下拉   */
  24. GPIOA->CRH=0x44444448;
  25. /*配置PA的8-11腳為中斷輸入線*/
  26. AFIO->EXTICR[2]=0x0;
  27. /*設(shè)置外部中斷線8中斷請(qǐng)求開啟其他的都關(guān)閉*/
  28. EXTI->IMR=0x00000100;
  29. /*下降沿觸發(fā)*/
  30. EXTI->FTSR=0x00000100;
  31. /*EXTI9_5的優(yōu)先級(jí)設(shè)為10*/
  32. NVIC->IP[23]=10;
  33. /*開啟23號(hào)中斷即EXTI9_5，關(guān)閉其他所有外部的中斷*/
  34. NVIC->ISER[0]=0x00800000;






  41. }
  42. void mysysint()//系統(tǒng)初始化程序
  43. {
  44. ErrorStatus HSEStartUpStatus;//說明標(biāo)志位
  45. RCC_DeInit();//所有外設(shè)全部缺省設(shè)置

  47. /* Enable HSE */
  48. RCC_HSEConfig(RCC_HSE_ON);
  49. /* Wait till HSE is ready and if Time out is reached exit */
  50. HSEStartUpStatus = RCC_WaitForHSEStartUp();
  51. if(HSEStartUpStatus == SUCCESS)//啟動(dòng)成功
  52. {
  53. /*這兩條FLASH指令必須加上，不知為啥？不加上就運(yùn)行幾秒后出錯(cuò)，參照系統(tǒng)初始化*/
  54. /* Enable The Prefetch Buffer */
  55. FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);//FLASH緩存開啟
  56. /* Configure the Latency cycle: Set 2 Latency cycles */
  57.   FLASH_SetLatency(FLASH_Latency_2);  //設(shè)置FLASH這些位表示SYSCLK(系統(tǒng)時(shí)鐘)周期與閃存訪問時(shí)間的比例,為010：兩個(gè)等待狀態(tài)，當(dāng) 48MHz < SYSCLK ≤ 72MHz
  58. /* Set PLL clock output to 72MHz using HSE (8MHz) as entry clock */
  59. RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);//外部時(shí)鐘為8M，PLL的輸入時(shí)鐘=8MHZ，倍頻系數(shù)9，

  61. /* Configure HCLK such as HCLK = SYSCLK */
  62. RCC_HCLKConfig(RCC_SYSCLK_Div1);//設(shè)置了啦AHB分頻器的分頻系數(shù)=1，即HCLK=SYSCLK=72MHZ
  63. /* Configure PCLK1 such as PCLK1 = HCLK/2 */
  64. RCC_PCLK1Config(RCC_HCLK_Div2);//設(shè)置了APB1外設(shè)的時(shí)鐘頻率最大是36M這里是APB1的分頻器設(shè)為2,PCLK1=HCLK/2=72/2=36MHZ正好是最大值
  65. /* Configure PCLK2 such as PCLK2 = HCLK */
  66. RCC_PCLK2Config(RCC_HCLK_Div1);//設(shè)置PLCK2=HCLK=72MHZ，的APB2分頻器=1
  67. /* Select the PLL as system clock source */
  68. RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);//設(shè)置了SYSCLK的提供者為PLL，頻率由上面算出=72MHZ
  69. /* disable PLL Ready interrupt */
  70. RCC_ITConfig(RCC_IT_PLLRDY, DISABLE);//PLL中斷關(guān)閉
  71. /* disable PLL Ready interrupt */
  72. RCC_ITConfig(RCC_IT_HSERDY,DISABLE);//HSE中斷關(guān)閉
  73. /* disable PLL Ready interrupt */
  74. RCC_ITConfig(RCC_IT_HSIRDY, DISABLE); //HSI中斷關(guān)閉
  75. /* disable PLL Ready interrupt */
  76. RCC_ITConfig(RCC_IT_LSERDY, DISABLE); //LSE中斷關(guān)閉
  77. /* disable PLL Ready interrupt */
  78. RCC_ITConfig(RCC_IT_LSIRDY, DISABLE); //LSI中斷關(guān)閉

  80. /* PLL clock divided by 1.5 used as USB clock source */
  81. RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);//設(shè)置USB的時(shí)鐘為=72、1.5=48mhz
  82. /* Configure ADCCLK such as ADCCLK = PCLK2/2 */
  83. RCC_ADCCLKConfig(RCC_PCLK2_Div2);//設(shè)置ADC時(shí)鐘=PCLK2/2= 36MHZ
  84. /* disable the LSE */
  85. RCC_LSEConfig(RCC_LSE_OFF);//外部低速晶振關(guān)閉

  87. /*DISable the RTC clock */
  88. RCC_RTCCLKCmd(DISABLE);
  89. /* DISable the Clock Security System */
  90. RCC_ClockSecuritySystemCmd(DISABLE);
  91. /* Enable the PLL */
  92. RCC_PLLCmd(ENABLE);//使能PLL







  100. /* PLL ans system clock config */
  101. }
  102. else
  103. {
  104. /* Add here some code to deal with this error */
  105. }





  111. }
復(fù)制代碼



作者: lz66    時(shí)間: 2016-7-14 15:45
寄存器地址不熟悉   這代碼看著真累  還是老老實(shí)實(shí)用庫(kù)函數(shù)寫吧
作者: qihuaman    時(shí)間: 2018-11-18 20:52
NVIC->IP[23]=10;取10是什么意思，學(xué)STM32卡在這里了
作者: qihuaman    時(shí)間: 2018-11-18 22:03
/*EXTI9_5的優(yōu)先級(jí)設(shè)為10*/
NVIC->IP[23]=10;


為什么這樣寫就是9_5優(yōu)先了？




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