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Mohan BA

Jan 20, 2020

Issue with UART on rugged board

in RB-A5D2x

ollowing is LoopBack Program to Write and Read from UART

while (flag) {

mraa_uart_write(uart, buffer, sizeof(buffer));

sleep(5);

mraa_uart_read(uart,buffer1,sizeof(buffer1));

printf("Data Read %s\n",buffer1);

sleep(5);

buffer1[0]='\0';

}

I tried with /dev/ttyS0 /ttyS1 /ttyS2 /ttyS3 and /dev/ttyS4. I short Port-4 pins (Pin no.1 and Pin no.2) pins

7 answers3 replies

10 Comments

ashrafulkhn

May 20, 2020

I request you to do a loopback test for the designated UART port using the process below and then proceed for the program in C or Python:

RuggedBoard has 5x UART on different ports. To test UART1, locate P4 port on your RB (refer hardware manual) and

Step1:

Locate the port P4 on the RuggedBoard. Refer to the Hardware manual.

Step 2:

Short PIN 1 (RS232_TX_1) and PIN 2 (RS232_RX_1) using a patch cord provided in the Box to echo the transmitted data back to RuggedBoard.

Step 3:

Use the following command to check the loop-back of the transmitted data. Microcom is an application used to access serial ports.

microcom /dev/ttyS4

Note: Microcom is a serial terminal and it is installed in RuggedBoard by default.

Step 4:

Type anything on the keyboard. If the system is working fine the characters you are typing should be displayed in the terminal.

Step 5:

Press Ctrl + X to come out of the Microcom terminal and back to the Minicom.

Note: After entering the above command you will notice that whatever you type on your keyboard are getting displayed on the terminal and when you remove short of the PIN 1 and PIN 2 keyboard entries are not displayed anymore and resume the loop-back once you short the PINs again.