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STM32工程中调用printf函数

2015-1-19 11:48:03 2678

0 在STM32工程中调用printf函数，需要加入如下代码： #ifdef __GNUC__ /* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf set to 'Yes') calls __io_putchar() / #define PUTCHAR_PROTOTYPE int __io_putchar(int ch) #else #define PCHAR_PROTOTYPE int fputc(int ch, FILE f) #endif /* __GNUC__ UT/ void Printf_Init(void) { /!< At this stage the microcontroller clock setting is already configured, this is done through SystemInit() function which is called from startup file (startup_stm32f10x_xx.s) before to branch to application main. To reconfigure the default setting of SystemInit() function, refer to system_stm32f10x.c file / / USARTx 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_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; STM_EVAL_COMInit(COM1, &USART_InitStructure); / Output a message on Hyperterminal using printf function / //printf("nrUSART Printf Example: retarget the C library printf function to the USARTnr"); // printf("rnnn WWW.ARMJISHU.COM %s configured....", EVAL_COM1_STR); // printf("nr ############ WWW.ARMJISHU.COM! ############ ("__DATE__ " - " __TIME__ ")nr"); } /* * @brief Retargets the C library printf function to the USART. * @param None * @retval None / PUTCHAR_PROTOTYPE { / Place your implementation of fputc here / / e.g. write a character to the USART / USART_SendData(EVAL_COM1, (uint8_t) ch); / Loop until the end of transmission / while (USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TC) == RESET) {} return ch; } 复制代码* 0
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