作业五:定时器控制led跑马灯,
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#include "stm32f10x.h"
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#include "stm32_eval.h"
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#include <stdio.h>
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EXTI_InitTypeDef EXTI_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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USART_InitTypeDef USART_InitStructure;
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USART_ClockInitTypeDef USART_ClockInitStructure;
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void EXTIkeyS3_Config(void);
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void EXTIkeyS4_Config(void);
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void RCC_Configuration(void)
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{
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RCC_DeInit();
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RCC_HSICmd(ENABLE);
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while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET);
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RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);
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RCC_HSEConfig(RCC_HSE_OFF);
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RCC_LSEConfig(RCC_LSE_OFF);
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RCC_PLLConfig(RCC_PLLSource_HSI_Div2,RCC_PLLMul_9);
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RCC_PLLCmd(ENABLE);
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while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
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RCC_ADCCLKConfig(RCC_PCLK2_Div4);
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RCC_PCLK2Config(RCC_HCLK_Div1);
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RCC_PCLK1Config(RCC_HCLK_Div2);
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RCC_HCLKConfig(RCC_SYSCLK_Div1);
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RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
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while(RCC_GetSYSCLKSource() != 0x08);
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE);
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GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE);
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GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_Init(GPIOD, &GPIO_InitStructure);
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GPIO_ResetBits(GPIOD,GPIO_Pin_2);
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE);
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GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);
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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;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_Init(GPIOC, &GPIO_InitStructure);
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GPIO_ResetBits(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);
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}
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void USART_int(long BaudRate)
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{
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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USART_InitStructure.USART_BaudRate = BaudRate;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
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USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
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USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
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USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
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USART_ClockInit(USART1, &USART_ClockInitStructure);
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USART_Init(USART1, &USART_InitStructure);
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USART_Cmd(USART1, ENABLE);
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USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
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USART_Cmd(USART1, ENABLE);
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
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NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 15;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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}
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int main(void)
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{RCC_Configuration();
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EXTIkeyS3_Config();
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EXTIkeyS4_Config();
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USART_int(115200);
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printf("Config done,waiting for interrupt......\r\n");
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while (1)
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{
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}
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}
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void EXTIkeyS3_Config(void)
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{
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
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GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource10);
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EXTI_InitStructure.EXTI_Line = EXTI_Line10;
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EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
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EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
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EXTI_InitStructure.EXTI_LineCmd = ENABLE;
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EXTI_Init(&EXTI_InitStructure);
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NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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}
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void EXTIkeyS4_Config(void)
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{
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init(GPIOC, &GPIO_InitStructure);
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
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GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource11);
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EXTI_InitStructure.EXTI_Line = EXTI_Line11;
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EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
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EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
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EXTI_InitStructure.EXTI_LineCmd = ENABLE;
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EXTI_Init(&EXTI_InitStructure);
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NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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}
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void EXTI15_10_IRQHandler(void)
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{
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if(EXTI_GetITStatus(EXTI_Line10) != RESET)
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{
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GPIO_SetBits(GPIOC,GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);
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printf("S4 interrupt ......\r\n");
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EXTI_ClearITPendingBit(EXTI_Line10);
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}
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if(EXTI_GetITStatus(EXTI_Line11) != RESET)
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{
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GPIO_SetBits(GPIOC,GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3);
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printf("S3 interrupt ......\r\n");
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EXTI_ClearITPendingBit(EXTI_Line11);
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}
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}
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#ifdef USE_FULL_ASSERT
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void assert_failed(uint8_t* file, uint32_t line)
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{
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while (1)
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{
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}
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}
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#endif
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#ifdef __GNUC__
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#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
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#else
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#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
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#endif /* __GNUC__ */
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PUTCHAR_PROTOTYPE
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{
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USART_SendData(EVAL_COM1, (uint8_t) ch);
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while (USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TC) == RESET)
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{}
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return ch;
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}
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#ifdef USE_FULL_ASSERT
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void assert_failed(uint8_t* file, uint32_t line)
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{
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while (1)
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{
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}
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}
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#endif