大家在使用UART都想急于试下好不好用，而这个最好的方法是HELLO WORLD
我说HELLO WORLD 大家都应该明白，就是打印一段文字。但ATMEL SAM4E确很特别。
实现的模块叫Serial Standard I/O
大家别看不起我找到的模块，应为一般情况下只找UART或USART例程。
运行的效果如下：
程序如下：
- #include <board.h>
- #include <sysclk.h>
- #include <stdio_serial.h>
- #if SAM
- #include <conf_uart_serial.h>
- #else
- #include <conf_usart_serial.h>
- #endif
- /*! \brief Main function.
- */
- int main(void)
- {
- uint32_t ch;
- const usart_serial_options_t usart_serial_options = {
- .baudrate = USART_SERIAL_EXAMPLE_BAUDRATE,
- .charlength = USART_SERIAL_CHAR_LENGTH,
- .paritytype = USART_SERIAL_PARITY,
- .stopbits = USART_SERIAL_STOP_BIT
- };
- sysclk_init();
- /* Initialize the board. The board-specific conf_board.h file contains
- * the configuration of the board initialization.
- */
- board_init();
- // Initialize Serial Interface using Stdio Library
- stdio_serial_init(USART_SERIAL_EXAMPLE, &usart_serial_options);
- // Print welcome message
- printf("\n\rHello ATMEL World!\n\r");
- // Get and echo a character forever.
- while (true) {
- scanf("%c",(char*)&ch);
- if (ch) {
- printf("%c",(char)ch);
- }
- }
- }
解析一下：
首先声明了相应的宏。
#define CONF_BOARD_UART_CONSOLE
在conf_uart_serial.h里声明UART相关参数。
- #ifndef CONF_USART_SERIAL_H
- #define CONF_USART_SERIAL_H
- #ifdef __cplusplus
- extern "C" {
- #endif
- // USART serial configuration options
- #define USART_SERIAL_EXAMPLE ((Usart*)CONSOLE_UART)
- #define USART_SERIAL_EXAMPLE_BAUDRATE (115200)
- #define USART_SERIAL_CHAR_LENGTH (US_MR_CHRL_8_BIT)
- #define USART_SERIAL_PARITY (US_MR_PAR_NO)
- #define USART_SERIAL_STOP_BIT (US_MR_NBSTOP_1_BIT)
- #ifdef __cplusplus
- }
- #endif
- #endif/* CONF_USART_SERIAL_H_INCLUDED */
用stdio_serial_init初始化串行标准I/O
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