Dear community,

I am developing for D2000 with Zephyr and  I currently need to be able to write to the UART B and to monitor it.  However, I cannot manage to do it.

For writing to the UAR I am using the function  uart_poll_out(). For example.:

#include <zephyr.h>

#include <uart.h>

#include <device.h>

void main(void)

{

struct device *dev_b = device_get_binding("UART_1");

uart_poll_out(dev_b, 'b');

}

After flashing the program to D2000, I set the jumpers J9, J10, J11 in the CTS, TXD and N/C positions, open terminal on the virtual serial port, but it seems that there is no signal – nothing happens when I press the  “reset” button . With the same settings I am able to monitor UART B of D2000 with QMSI.  Also the same code works well for the UART A, e.g.:

void main(void)

{

      struct device *dev_a = device_get_binding("UART_0");

      uart_poll_out(dev_a, 'a');

}

Did anyone have the similar issues and was able to solve them?

I would really appreciate your help.

Best regards,

Vasily

Hi Felipe,

I am doing good. How are you?

Thank you very much for your help!

Did you check the pointer received to you dev_b variable after a call of device binding? is it null?

I’ve just checked it. Not it’s not null.

- Check the platform pin-mux to see if uart pins that goes to your pc match with the uart that you're trying to use;

- Also, in pinmux check if these pins are set to behave as uart function before you use/configure the uart;

Both seem to be correct. When I have a QMSI 1.1 project instead of Zephyr 1.4, I am able to see the messages on the UART B with exactly the same settings.

- did you configured the uart connection parameteres? eg.: baud rate, start/stop bit?

I am using the following configurations:

CONFIG_SERIAL=y

CONFIG_UART_INTERRUPT_DRIVEN=n

CONFIG_UART_QMSI_0=y

CONFIG_UART_QMSI_0_HW_FC=n

CONFIG_UART_QMSI_0_BAUDRATE=57600

#CONFIG_UART_QMSI_1=y

#CONFIG_UART_QMSI_1_HW_FC=n

#CONFIG_UART_QMSI_1_BAUDRATE=57600

Best,

Vasily