[海思] HI3531D串口调试

背景

• 根据需求，我需要测试和使用海思3531d的串口1和串口3，而板子默认是只有调试串口UART0，因此需要将其他的串口进行使能和配置

步骤

1. 修改设备树，使能其他串口

   # 修改板子相关的dts，这里为hisi3531d-demb.dts $ vim arch/arm/boot/dts/hisi3531d-demb.dts ... &uart0 { status = "okay"; }; &uart1 { status = "okay"; }; # 这里我不用打开串口2，需要打开过程类似 &uart3 { status = "okay"; }; ... #编译内核并烧写到板子上 $ make ARCH=arm CROSS_COMPILE=arm-hisiv500-linux- uImage # 烧写内核后查看是否有其他节点 AMA0~2 $ ls /dev/ttyAMA* /dev/ttyAMA0 /dev/ttyAMA1 /dev/ttyAMA2(这个是串口三的节点)

2. 引脚复用

   # uart1 $ himm 0x120f0208 0x2 $ himm 0x120f020C 0x2 # uart3 $ himm 0x120f0218 0x1 $ himm 0x120f021C 0x1

3. 简单测试输入输出

   #/dev/ttyAMA0是调试串口，因此只要启动时有打印，就是可以用的 #测试/dev/ttyAMA1 #发送数据（PC串口助手接收） $ echo 111 > /dev/ttyAMA1 #接收数据（PC串口助手发送） $ cat /dev/ttyAMA1

4. 查看串口的硬件分配和发送接收状态

   $ cat /proc/tty/driver/ttyAMA

问题与解决方案

• 现象：在uart1和uart3发送数据给PC时，PC的串口调试助手可以收到消息，但在接收数据（cat /dev/ttyAMA1）时，PC串口助手发送的数据没有在终端上显示，而是原路返回到PC串口助手上显示，导致应用程序读不到
• 原因：串口没有正确初始化，即结构体struct termios里的参数没有初始化好

• 解决方案：写一个应用程序初始化并测试，下列参考代码在板子上可以正确运行

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  ​#include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<sys/types.h> #include<sys/stat.h> #include<fcntl.h> #include<termios.h> #include<errno.h> #include<string.h> #include <signal.h> //宏定义 #define HI_FALSE -1 #define HI_TRUE 0 #ifdef debugprintf #define debugpri(mesg, args...) fprintf(stderr, "[HI Serial print:%s:%d:] " mesg "\n", __FILE__, __LINE__, ##args) #else #define debugpri(mesg, args...) #endif int HiSerfd; void HI_Serial_Close(int fd); void Hi_sigsegv(int dummy) { if(HiSerfd > 0) HI_Serial_Close(HiSerfd); fprintf(stderr, "Hi Serial Caught SIGSEGV, Abort!\n"); fclose(stderr); abort(); } void Hi_sigterm(int dummy) { if(HiSerfd > 0) HI_Serial_Close(HiSerfd); fprintf(stderr, "Hi Serial Caught SIGTERM, Abort!\n"); fclose(stderr); exit(0); } void Hi_init_signals(void) { struct sigaction sa; sa.sa_flags = 0; sigemptyset(&sa.sa_mask); sigaddset(&sa.sa_mask, SIGSEGV); sigaddset(&sa.sa_mask, SIGTERM); sigaddset(&sa.sa_mask, SIGPIPE); sa.sa_handler = Hi_sigsegv; sigaction(SIGSEGV, &sa, NULL); sa.sa_handler = Hi_sigterm; sigaction(SIGTERM, &sa, NULL); sa.sa_handler = SIG_IGN; sigaction(SIGPIPE, &sa, NULL); } int HI_Serial_Usage(void) { printf("Usage:\n"); printf("\tmyhicom [-d] <HiSerialDevice> [-s] get netdeviece info [-rw] read or wite select\n"); printf("\tmyhicom [-h] for more usage\n"); printf("\tmyhicom [-v] the verson of the sofware\n"); printf("\tExample:\n\tmyhicom -d /dev/ttyAMA1 -s 115200 -w HiSerial:HelloWorld\n"); } /* *Function: HI_Serial_Open(int fd,char* ComDevice) *Param: fd:file descirbe handle Serial Device: /dev/ttyAMA1 /dev/ttyAMA2 *Output: Ok or Fail */ int HI_Serial_Open(char* HiSerDevice) { int fd; fd = open(HiSerDevice, O_RDWR|O_NOCTTY|O_NDELAY); if (HI_FALSE == fd) { perror("HiSerial Can't Open Serial HiSerDevice"); return(HI_FALSE); } //恢复串口为阻塞状态 if(fcntl(fd, F_SETFL, 0) < 0) { debugpri("fcntl failed!\n"); return(HI_FALSE); } else { debugpri("fcntl=%d\n",fcntl(fd, F_SETFL,0)); } //测试是否为终端设备 if(0 == isatty(STDIN_FILENO)) { debugpri("standard input is not a terminal device\n"); return(HI_FALSE); } else { debugpri("isatty success!\n"); } printf("fd->open=%d\n",fd); return fd; } /* *Function: HI_Serial_Close(int fd) *Param: fd:file descirbe handle *Output: Null */ void HI_Serial_Close(int fd) { if(fd > 0) close(fd); return; } /* *Function: HI_Serial_Set(int fd,int speed,int flow_ctrl,int databits,int stopbits,int parity) *Param1: fd: file descirbe handle *Param2: speed: select the Serial speed.115200,19200,9600... *Param3: flow_ctrl: if use flow control *Param4: databits: data bit select *Param5: stopbits: stopbits select *Param5: parity: partiy select *Output: Ok or Fail */ int HI_Serial_Set(int fd,int speed,int flow_ctrl,int databits,int stopbits,int parity) { int i; int status; int speed_arr[] = { B115200, B19200, B9600, B4800, B2400, B1200, B300}; int name_arr[] = {115200, 19200, 9600, 4800, 2400, 1200, 300}; struct termios options; if( tcgetattr( fd,&options) != 0) { perror("SetupSerial 1"); return(HI_FALSE); } //set buater rate for ( i= 0; i < sizeof(speed_arr) / sizeof(int); i++) { if (speed == name_arr[i]) { cfsetispeed(&options, speed_arr[i]); cfsetospeed(&options, speed_arr[i]); } } //set control model options.c_cflag |= CLOCAL; options.c_cflag |= CREAD; //set flow control switch(flow_ctrl) { case 0 ://none options.c_cflag &= ~CRTSCTS; break; case 1 ://use hard ware options.c_cflag |= CRTSCTS; break; case 2 ://use sofware options.c_cflag |= IXON | IXOFF | IXANY; break; } //select data bit options.c_cflag &= ~CSIZE; switch (databits) { case 5 : options.c_cflag |= CS5; break; case 6 : options.c_cflag |= CS6; break; case 7 : options.c_cflag |= CS7; break; case 8: options.c_cflag |= CS8; break; default: fprintf(stderr,"Unsupported data size\n"); return (HI_FALSE); } //select parity bit switch (parity) { case 'n': case 'N': options.c_cflag &= ~PARENB; options.c_iflag &= ~INPCK; break; case 'o': case 'O': options.c_cflag |= (PARODD | PARENB); options.c_iflag |= INPCK; break; case 'e': case 'E': options.c_cflag |= PARENB; options.c_cflag &= ~PARODD; options.c_iflag |= INPCK; break; case 's': case 'S': options.c_cflag &= ~PARENB; options.c_cflag &= ~CSTOPB; break; default: fprintf(stderr,"Unsupported parity\n"); return (HI_FALSE); } // set stopbit switch (stopbits) { case 1: options.c_cflag &= ~CSTOPB; break; case 2: options.c_cflag |= CSTOPB; break; default: fprintf(stderr,"Unsupported stop bits\n"); return (HI_FALSE); } //set raw data output options.c_oflag &= ~OPOST; options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); //options.c_lflag &= ~(ISIG | ICANON); //set wait time options.c_cc[VTIME] = 1; options.c_cc[VMIN] = 1; tcflush(fd,TCIFLUSH); //set the attribute to HiSerial device if (tcsetattr(fd,TCSANOW,&options) != 0) { perror("com set error!\n"); return (HI_FALSE); } return (HI_TRUE); } /* *Function: HI_Serial_Init(int fd, int speed,int flow_ctrl,int databits,int stopbits,int parity) *Param: ... *Output: HI_TRUE or HI_FALSE */ int HI_Serial_Init(int fd, int speed,int flow_ctrl,int databits,int stopbits,int parity) { int err; //设置串口数据帧格式 if (HI_Serial_Set(fd,speed,flow_ctrl,databits,stopbits,parity) == HI_FALSE) { return HI_FALSE; } else { return HI_TRUE; } } /* *Function: HI_Serial_Send(int fd, char *send_buf,int data_len) *Param1: fd:file descirbe handle *Param2: send_buf:Data to be send *Param2: data_len:Data len *Output: Data send len or HI_FALSE */ int HI_Serial_Send(int fd, char *send_buf,int data_len) { int len = 0; len = write(fd,send_buf,data_len); if (len == data_len ) { debugpri("send data is %s\n",send_buf); return len; } else { tcflush(fd,TCOFLUSH); return HI_FALSE; } } /* *Function: HI_Serial_Recv(int fd, char *rcv_buf,int data_len) *Param1: fd:file descirbe handle *Param2: rcv_buf:receive Data *Param2: data_len:receive Data len *Output: Receive Data len or HI_FALSE */ int HI_Serial_Recv(int fd, char *rcv_buf,int data_len) { int len,fs_sel; fd_set fs_read; struct timeval time; FD_ZERO(&fs_read); FD_SET(fd,&fs_read); time.tv_sec = 30; time.tv_usec = 0; //select fdset fs_sel = select(fd+1,&fs_read,NULL,NULL,&time); if(fs_sel) { len = read(fd,rcv_buf,data_len); debugpri("HiSeral Receive Data = %s len = %d fs_sel = %d\n",rcv_buf,len,fs_sel); return len; } else { debugpri("Hiserial haven't data receive!"); return HI_FALSE; } } int main ( int argc, char *argv[] ) { int cmd; int len; //extern char *optarg; //extern int optind, opterr, optopt; char HiSerialDev[32]="/dev/ttyAMA1"; char sendbuf[1024]={0}; char recvbuf[1024]={0}; int SerialSpeed = 115200; Hi_init_signals(); if(argc == 1) { HI_Serial_Usage(); exit(0); } else { while ((cmd = getopt(argc, argv, ":d:s:rw:hv")) != -1) { switch (cmd) { case 'h': HI_Serial_Usage(); break; case 'v': printf("myHicom --Verson V1.0.0\n"); break; case 'd': //printf("catch -d %s \n",optarg); memset(HiSerialDev,0,sizeof(HiSerialDev)); sprintf(HiSerialDev,"%s",optarg); printf("myHicom HiSerialDev %s\n",optarg); break; case 's': SerialSpeed = atoi(optarg); printf("myHicom speed %d\n",SerialSpeed); break; case 'r': debugpri("myHicom read\n"); HiSerfd = HI_Serial_Open(HiSerialDev); HI_Serial_Init(HiSerfd,SerialSpeed,0,8,1,'N'); while(1) { len = HI_Serial_Recv(HiSerfd, recvbuf,sizeof(recvbuf)); if(len > 0) { recvbuf[len] = '\0'; printf("Hiserial receive data: %s\n",recvbuf); memset(recvbuf,0,sizeof(recvbuf)); //break; } else { debugpri("Hiserial haven't data receive \n"); } }; break; case 'w': debugpri("myHicom write %s\n",optarg); HiSerfd = HI_Serial_Open(HiSerialDev); printf("fd = %d device = %s speed = %d\n",HiSerfd,HiSerialDev,SerialSpeed); HI_Serial_Init(HiSerfd,SerialSpeed,0,8,1,'N'); sprintf(sendbuf,"%s\n",optarg); HI_Serial_Send(HiSerfd, sendbuf, strlen(sendbuf)+1); if(HiSerfd > 0) HI_Serial_Close(HiSerfd); break; case ':': printf ("option: -%c missing argument. -h for help.\n",(char)optopt); break; case '?': printf("Unknown option: -%c\n",(char)optopt); break; default: exit(0); } } } return 0; } ​

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  ​# 测试发送和接收 $ ./myhicom -d /dev/ttyAMA1 -s 115200 -r $ ./myhicom -d /dev/ttyAMA1 -s 115200 -w helloworld ​