Cubieboard--zigbee-communication
20 November 2014
##How To Use The Uart
About this Article
Author: allen — allen@cubietech.com — 2014/03/26 16:50 Copyrights: CC Attribution-Share Alike 3.0 Unported Contributors: Cubieboard Community :
Set GPIO pins to UART pins
Edit /boot/script.bin file
script.bin info Fex Guide
Get script.fex file
#bin2fex script.bin script.fex
#vi script.fex
Make script.fex to script.bin
#fex2bin script.fex script.bin
#reboot
[uart_para4]
uart_used = 1
uart_port = 4
uart_type = 2
uart_tx = port:PG10<4><1><default><default>
uart_rx = port:PG11<4><1><default><default>
Disabled used pin PG10 and PG11
[gpio_para]
gpio_used = 1
gpio_num = 67
gpio_pin_1 = port:PG03<1><default><default><1>
gpio_pin_2 = port:PB19<1><default><default><1>
gpio_pin_3 = port:PB18<1><default><default><1>
gpio_pin_4 = port:PG06<1><default><default><1>
gpio_pin_5 = port:PG05<1><default><default><1>
gpio_pin_6 = port:PG04<1><default><default><1>
gpio_pin_7 = port:PG01<1><default><default><1>
gpio_pin_8 = port:PG02<1><default><default><1>
gpio_pin_9 = port:PG00<1><default><default><1>
gpio_pin_10 = port:PH14<1><default><default><1>
gpio_pin_11 = port:PH15<1><default><default><1>
gpio_pin_12 = port:PI06<1><default><default><1>
gpio_pin_13 = port:PI05<1><default><default><1>
gpio_pin_14 = port:PI04<1><default><default><1>
---------------------下面删除---------------------
gpio_pin_15 = port:PG11<1><default><default><1>
gpio_pin_16 = port:PG10<1><default><default><1>
---------------------上面删除---------------------
gpio_pin_17 = port:PG09<1><default><default><1>
gpio_pin_18 = port:PG08<1><default><default><1>
gpio_pin_19 = port:PG07<1><default><default><1>
ATTENTION
The ttyS* is not the port 4 set upside; use dmesg | grep ttyS* to show which ttyS* is the corret name;
Use follwing code to debug
#vi uart_test.c
/********************************************************************
**************************uart_test*********************************
********************************************************************/
#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 <sys/time.h>
#include <string.h>
#define TRUE 1
#define FALSE -1
int speed_arr[] = {B115200, B38400, B19200, B9600, B4800, B2400, B1200, B300,
B38400, B19200, B9600, B4800, B2400, B1200, B300, };
int name_arr[] = {115200, 38400, 19200, 9600, 4800, 2400, 1200, 300,
38400, 19200, 9600, 4800, 2400, 1200, 300, };
void set_speed(int fd, int speed)
{
int i;
int status;
struct termios Opt;
tcgetattr(fd,&Opt);
for (i= 0;i<sizeof(speed_arr)/sizeof(int);i++)
{
if(speed == name_arr[i])
{
tcflush(fd, TCIOFLUSH);
cfsetispeed(&Opt, speed_arr[i]);
cfsetospeed(&Opt, speed_arr[i]);
status = tcsetattr(fd, TCSANOW, &Opt);
if(status != 0)
perror("tcsetattr fd1");
return;
}
tcflush(fd,TCIOFLUSH);
}
}
int set_Parity(int fd,int databits,int stopbits,int parity)
{
struct termios options;
if( tcgetattr( fd,&options)!= 0)
{
perror("SetupSerial 1");
return(FALSE);
}
options.c_cflag &= ~CSIZE;
switch(databits)
{
case 7:
options.c_cflag |= CS7;
break;
case 8:
options.c_cflag |= CS8;
break;
default:
fprintf(stderr,"Unsupported data size\n");
return (FALSE);
}
switch(parity)
{
case 'n':
case 'N':
options.c_cflag &= ~PARENB; /* Clear parity enable */
options.c_iflag &= ~INPCK; /* Enable parity checking */
options.c_iflag &= ~(ICRNL|IGNCR);
options.c_lflag &= ~(ICANON );
break;
case 'o':
case 'O':
options.c_cflag |= (PARODD | PARENB);
options.c_iflag |= INPCK; /* Disnable parity checking */
break;
case 'e':
case 'E':
options.c_cflag |= PARENB; /* Enable parity */
options.c_cflag &= ~PARODD;
options.c_iflag |= INPCK; /* Disnable parity checking */
break;
case 'S':
case 's': /*as no parity*/
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
break;
default:
fprintf(stderr,"Unsupported parity\n");
return (FALSE);
}
switch(stopbits)
{
case 1:
options.c_cflag &= ~CSTOPB;
break;
case 2:
options.c_cflag |= CSTOPB;
break;
default:
fprintf(stderr,"Unsupported stop bits\n");
return (FALSE);
}
/* Set input parity option */
if(parity != 'n')
options.c_iflag |= INPCK;
options.c_cc[VTIME] = 150; // 15 seconds
options.c_cc[VMIN] = 0;
tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */
if(tcsetattr(fd,TCSANOW,&options) != 0)
{
perror("SetupSerial 3");
return (FALSE);
}
return (TRUE);
}
int main(int argc, char **argv)
{
int fd;
int nread;
int nwrite;
int n=0;
int i=0;
char buffer[15];
char devname_head[10] = "/dev/";
char dev_name[20];
if(argc < 2)
{
printf("Please input './test_uart ttySx'\n");
exit(1);
}
else
{
strcpy(dev_name, devname_head);
strcat(dev_name, argv[1]);
}
fd = open(dev_name, O_RDWR);
if(fd < 0)
{
perror("error to open /dev/ttySx\n");
exit(1);
}
if (fd > 0)
{
set_speed(fd,115200);
}
else
{
printf("Can't Open Serial Port!\n");
exit(0);
}
if (set_Parity(fd,8,1,'N') == FALSE)
{
printf("Set Parity Error\n");
exit(1);
}
printf("\nWelcome to uart_test\n\n");
memset(buffer,0,sizeof(buffer));
char test[15] = "hello world";
nwrite = write(fd,test,strlen(test));
if(nwrite < 0)
{
printf("write error\n");
}
printf("Send test data------>%s\n",test);
while(1)
{
nread = read(fd,&buffer[n],1);
if(nread < 0)
{
printf("read error\n");
}
printf("read char is -> %c \n",buffer[n]);
if (strlen(buffer) == strlen(test))
{
printf("Read Test Data finished,Read Test Data is------->%s\n",buffer);
memset(buffer,0,sizeof(buffer));
printf("Send test data again------>%s\n",test);
write(fd,test,strlen(test));
n=0;
sleep(1);
continue;
}
n++;
}
}
Build by following shell script
#apt-get install gcc build-essential
#gcc uart_test.c -o uart_test
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