UART with EXT pins on Thingy:52 ?

RE: UART with EXT pins on Thingy:52 ?

ragnarolsson — Mon, 15 Apr 2019 13:08:54 GMT

Thanks again, then i now what my option are.

RE: UART with EXT pins on Thingy:52 ?

Jørgen Holmefjord — Mon, 15 Apr 2019 13:06:47 GMT

Looks like that could be hard to do, especially if you need UART and SPI at the same time. You can reconfigure the GPIOs between UART and SPI if that is an option, and use a pin on the I/O expander for SPI CS, and use the state of this pin to also tri-state the UART lines on the other end of the lines. This depends on your requirements, switching to a TWI/I2C based device would probably be a much simpler solution.

RE: UART with EXT pins on Thingy:52 ?

ragnarolsson — Mon, 15 Apr 2019 12:47:53 GMT

Thanks for the answer, alright then i understand why is not working, my final plan was to use 1 device that uses UART and an other device that uses SPI together with the Thingy. But now i sounds like it's going to be difficult to do that. A solotion for me could be to try changing the SPI device to a I2C device instead. Do you see any good solution for implementing both a UART and a SPI communication to the Thingy?

RE: UART with EXT pins on Thingy:52 ?

Jørgen Holmefjord — Mon, 15 Apr 2019 12:29:54 GMT

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

RE: UART with EXT pins on Thingy:52 ?

Jørgen Holmefjord — Mon, 15 Apr 2019 12:29:52 GMT

Hi,

Best regards,
Jørgen