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Altera_Forum
Honored Contributor
Honored ContributorUART Communication problem
Hi All,
I am using DE1 kit and connect UART to COM1 port of pc.I write a code in Nios to transfer a single character to hyperterminal. Also set all the settings like baudrate,flow control,parity etc..in appropriate manner.At the run time I can see the TXD LED blinking on the kit But I can't receive any character on hyperterminal. Any suggestions ???1 Reply
Altera_Forum试用一下下面的代码。
祝你好运！ Try to use the code as bellow. Best regards!#include "unistd.h" // UNIX API # include <fcntl.h> // UNIX API # include <stdio.h> // printf() # include <string.h> // strlen() # include "alt_types.h" //++++++++++++++++++++++++++++++++++++++ // 修改UART名称 开始 // 根据SOPC Builder设置修改 //++++++++++++++++++++++++++++++++++++++ # include "system.h" # define my_uart_name UART_NAME //-------------------------------------- // 修改UART名称 开始 //-------------------------------------- # define CHAR_NUM 8 int main() { int fd; alt_u8 *ptr; alt_u8 charBuf; // 100字节的字符缓存 alt_u8 num_temp1, num_temp2; // 临时变量 alt_u8 *msg1 = "Please Enter 8 charaters : "; alt_u8 *msg2 = " has been Rcved\n"; //++++++++++++++++++++++++++++++++++++ // 初始化 开始 //++++++++++++++++++++++++++++++++++++ ptr = charBuf; // 指向字符缓冲区 num_temp2 = CHAR_NUM; // 欲读入CHAR_NUM个字符 num_temp1 = num_temp2; //----------------------------------- // 初始化 结束 //----------------------------------- //++++++++++++++++++++++++++++++++++++ // 打开UART 开始 //++++++++++++++++++++++++++++++++++++ fd = open(my_uart_name, O_RDWR, 0666); // 以可读写方式打开设备文件 if (fd < 0) // 如果打开失败 { printf("error\n "); return 1; } //------------------------------------ // 打开UART 结束 //------------------------------------ //++++++++++++++++++++++++++++++++++++ // 输出msg1 开始 //++++++++++++++++++++++++++++++++++++ write(fd, msg1, strlen(msg1)); //------------------------------------ // 输出msg1 结束 //------------------------------------ //++++++++++++++++++++++++++++++++++++ // 读取CHAR_NUM个ASCII码字符 开始 //++++++++++++++++++++++++++++++++++++ while(num_temp1) // 读取CHAR_NUM个ASCII码字符 { num_temp2 = read(fd, ptr, num_temp2); ptr += num_temp2; num_temp1 -= num_temp2; num_temp2 = num_temp1; } //------------------------------------ // 读取CHAR_NUM个ASCII码字符 结束 //------------------------------------ //++++++++++++++++++++++++++++++++++++ // 输出读入字符和msg2 开始 //++++++++++++++++++++++++++++++++++++ write(fd, charBuf, 8); // 输出读入字符 write(fd, msg2, strlen(msg2)); // 输出msg2 //------------------------------------ // 输出读入字符和msg2 结束 //------------------------------------ //++++++++++++++++++++++++++++++++++++ // 关闭UART 开始 //++++++++++++++++++++++++++++++++++++ close(fd); // 关闭设备 //------------------------------------ // 关闭UART 结束 //------------------------------------ return 0; }
