UART with EXT pins on Thingy:52 ?

[ragnarolsson]

Hey, i have got UART work on my Thingy52 with ANA/DIG0 and ANA/DIG1 as receiver and transmitter but when I am trying to use EXT0 and EXT1 as receiver and transmitter it doesn’t work.

This was how the code looked like when using EXT0 and EXT as receiver and transmitter :

const app_uart_comm_params_t comm_params =
{
SX_IOEXT_0,
SX_IOEXT_1,
MOS_1,
MOS_2,
APP_UART_FLOW_CONTROL_DISABLED,
false,
UART_BAUDRATE_BAUDRATE_Baud9600
};

And this is how the code looked like when i used ANA/DIG0 and ANA/DIG1 as receiver and transmitter :

const app_uart_comm_params_t comm_params =
{
ANA_DIG1,
ANA_DIG2,
MOS_1,
MOS_2,
APP_UART_FLOW_CONTROL_DISABLED,
false,
UART_BAUDRATE_BAUDRATE_Baud9600
};

Anyone that know if Is it not possible to use the EXT0 and EXT1 pins for UART or is it required to do some additional setup?

[Jørgen Holmefjord]

Hi,

EXT0 and EXT1 pins are connected to I/O expander IC that is controlled through I2C/TWI, it is not intended for use directly with internal peripherals. Could you possibly re-arrange your pin mapping to control some simpler device with the I/O expander, and use internal GPIOs for UART connection?

Best regards,
Jørgen