/* Includes ------------------------------------------------------------------*/ #include "stm32f10x_lib.h" #include "stdio.h" /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/
ErrorStatus HSEStartUpStatus;
USART_InitTypeDef USART_InitStructure;
/* Private function prototypes -----------------------------------------------*/ void RCC_Configuration(void); void GPIO_Configuration(void); void NVIC_Configuration(void);
/* Private functions ---------------------------------------------------------*/
/******************************************************************************* * Function Name : main * Description : Main program * Input : None * Output : None * Return : None *******************************************************************************/ int main(void) { #ifdef DEBUG debug(); #endif
/* System Clocks Configuration */ RCC_Configuration(); /* NVIC configuration */ NVIC_Configuration();
/* Configure the GPIO ports */ GPIO_Configuration();
/* USARTx configuration ------------------------------------------------------*/ /* USART1 configured as follow: - BaudRate = 115200 baud - Word Length = 8 Bits - One Stop Bit - No parity - Hardware flow control disabled (RTS and CTS signals) - Receive and transmit enabled - USART Clock disabled - USART CPOL: Clock is active low - USART CPHA: Data is captured on the second edge - USART LastBit: The clock pulse of the last data bit is not output to the SCLK pin */ USART_InitStructure.USART_BaudRate = 115200; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No ; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_InitStructure.USART_Clock = USART_Clock_Disable; USART_InitStructure.USART_CPOL = USART_CPOL_Low; USART_InitStructure.USART_CPHA = USART_CPHA_2Edge; USART_InitStructure.USART_LastBit = USART_LastBit_Disable; /* Configure the USART1*/ USART_Init(USART1, &USART_InitStructure);
/* Enable the USART1 */ USART_Cmd(USART1, ENABLE);
printf("
retarget the C library printf function to the USART
");
while(1); }
/******************************************************************************* * Function Name : RCC_Configuration * Description : Configures the different system clocks. * Input : None * Output : None * Return : None *******************************************************************************/ void RCC_Configuration(void) { /* RCC system reset(for debug purpose) */ RCC_DeInit();
/* Enable HSE */ RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */ HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS) { /* HCLK = SYSCLK */ RCC_HCLKConfig(RCC_SYSCLK_Div1); /* PCLK2 = HCLK */ RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 */ RCC_PCLK1Config(RCC_HCLK_Div2);
/* Flash 2 wait state */ FLASH_SetLatency(FLASH_Latency_2); /* Enable Prefetch Buffer */ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* PLLCLK = 4MHz * 9 = 36MHz */ RCC_PLLConfig(RCC_PLLSource_HSE_Div2, RCC_PLLMul_9);
/* Enable PLL */ RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */ while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) { }
/* Select PLL as system clock source */ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */ while(RCC_GetSYSCLKSource() != 0x08) { } } /* TIM2 clock enable */
/* GPIOA clock enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Enable USART1 clocks */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
} /******************************************************************************* * Function Name : GPIO_Configuration * Description : Configure the GPIOD Pins. * Input : None * Output : None * Return : None *******************************************************************************/ void GPIO_Configuration(void) { GPIO_InitTypeDef GPIO_InitStructure;
/* Configure USART1_Tx as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART1_Rx as input floating */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); }
/******************************************************************************* * Function Name : NVIC_Configuration * Description : Configure the nested vectored interrupt controller. * Input : None * Output : None * Return : None *******************************************************************************/ void NVIC_Configuration(void) { #ifdef VECT_TAB_RAM /* Set the Vector Table base location at 0x20000000 */ NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); #else /* VECT_TAB_FLASH */ /* Set the Vector Table base location at 0x08000000 */ NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); #endif }
#ifdef DEBUG
/******************************************************************************* * Function Name : fputc * Description : Retargets the C library printf function to the USART. * Input : None * Output : None * Return : None *******************************************************************************/
int fputc(int ch, FILE *f) { /* Write a character to the USART */ USART_SendData(USART1, (u8) ch); while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET) { } return ch; }
/******************************************************************************* * Function Name : assert_failed * Description : Reports the name of the source file and the source line number * where the assert error has occurred. * Input : - file: pointer to the source file name * - line: assert error line source number * Output : None * Return : None *******************************************************************************/ void assert_failed(u8* file, u32 line) { while(1) { } } #endif
为什么回在串口中没有显示呢?
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