/******************************************************************************* * 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();
#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) {
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; } 上面换成 PUTCHAR_PROTOTYPE { /* Write a character to the USART */ USART_SendData(USARTx, (u8) ch);
/* Loop until the end of transmission */ while(USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET) { }