热度 21
2014-10-27 13:51
1470 次阅读|
1 个评论
回头看老版,才发现艾玛怎么会设计得那么复杂! 新版改动的地方有: 第一,不使用中断接收,而使用while来等待,因为本身函数的功能就是等待; 第二,去掉各种各样的全局数组; 第三,调用的函数指针更加简单; 第四,采用goto语句实现各种情形下的返回和收尾工作。 char UART_wait_spe_char(USART_TypeDef* USARTx, void (*fun)(void), int len, ...) { char byte = 0xFF, *p = (char *)len + sizeof(len); int i = 0; uint8_t channel; if (USARTx == USART1) channel = USART1_IRQn; else if (USARTx == USART2) channel = USART2_IRQn; else if (USARTx == USART3) channel = USART3_IRQn; else return -1; NVIC-ICER = (uint32_t)0x01 (channel (uint8_t)0x1F); while (1) { fun(); while (USART_GetITStatus(USARTx,USART_IT_RXNE) == RESET); byte = USART_ReceiveData(USARTx); uart_send_byte(USARTx, byte); for (i = 0; i len; i++) { if (byte == *((char *)(p + i * sizeof(int)))) goto END; } } END: NVIC-ISER = (uint32_t)0x01 (channel (uint8_t)0x1F); return byte; } 使用时,先定义函数入口参数fun: void uart1_wait_fun(void) { uart_printf(USART1, "\r\nPlease enter your choice (a/b/c/d): "); } 然后在主函数中执行: byte = UART_wait_spe_char(USART1, uart1_wait_fun, 4, 'a', 'b', 'c', 'd'); uart_printf(USART1, "\r\nControl the LED.\r\n"); 在串口终端minicom就会显示: Please enter your choice (a/b/c/d): F Please enter your choice (a/b/c/d): D Please enter your choice (a/b/c/d): a Control the LED.