UART example code for PCA10040 (not JLINK CDC UART)

[GrandGogo]

Hello,

I am trying to use uart port on pca10040,

1. Connected tx,rx pin to FTDI USB Serial Device converter .
2. Disconnected the usb cable, device is now powered over battery cell( Program is running as it blinks led pattern).
3. Configured com port on host at baud rate 38400. not able to see any data on terminal.
4. However when I connect usb cable to device. We start getting the data over FTDI USB Serial device converter com port .

I am using the example uart_pca10040, can please someone help me what i am doing wrong.

[Øyvind Karlsen]

Hi,

Are you connecting the FTDI chip to the UART ports on the devkit?

The UART lines on the devkit are shared with the interface MCU, in order to be able to use UART you will either need to configure different ports, or cut solderbridges SB22, SB23, SB24 and SB25.

Best regards,

Øyvind

[monpetit]

Did you connect GND pins of two boards?

[GrandGogo]

@Karlen

1. We are using the devkit developing the software, have configured pin RX-12,TX-13 connected to FTDI RX,TX respectively.
2. In final product there would be TX,RX of one MCU connected to the other MCU for communication(I assume it will work in this configuration ).

[Øyvind Karlsen]

Which SDK are you using? SDK 11 uses a default baudrate of 115200, check that the one you try to receive is the same as the one you initialize.

[GrandGogo]

SDK_- 11.0.0_89a8197, Its guess its not the baud-rate issue as when USB power is connected. we get the data.