Time multiplexing UART nrf52832

RE: Time multiplexing UART nrf52832

haakonsh — Mon, 06 Jan 2020 13:05:05 GMT

Sorry for the late reply.

Yeah, that's the correct method for changing the pins.

RE: Time multiplexing UART nrf52832

Bugo — Fri, 20 Dec 2019 19:04:52 GMT

How would you go along using that but while using the Serial Port Library? I have my serial define in: NRF_SERIAL_UART_DEF(m_serial_uart, 0);

And m_serial_uart.instance was made by the macro: .instance = NRF_DRV_UART_INSTANCE(_instance_number)

I don't know how to replace NRF_DRV_UART_INSTANCE(0) with the already created instance. I'm not using easy dma, so the call would be:

nrf_uart_hwfc_pins_set(????, NEW_RTS_PIN, NEW_CTS_PIN);

EDIT: Think i found how: nrf_uart_txrx_pins_set(m_serial_uart.instance.uart.p_reg, LCD_TX_PIN_NUMBER, LCD_RX_PIN_NUMBER);

RE: Time multiplexing UART nrf52832

haakonsh — Mon, 14 Oct 2019 09:06:49 GMT

You just need to change the pin numbers in PSEL.TXD and PSEL.RXD, and optionally PSEL.RTS and PSEL.CTS, at any time the UARTE is not in a transfer.

See f.ex. the UARTE HAL's nrf_uarte_txrx_pins_set function.

The pins you intend to switch to needs to be configured first:

// Configure Tx and Rx pins:
nrf_gpio_pin_set(NEW_TX_PIN);
nrf_gpio_cfg_output(NEW_TX_PIN);
nrf_gpio_cfg_input(NEW_RX_PIN, NRF_GPIO_PIN_NOPULL);

nrf_uarte_txrx_pins_set(NRF_DRV_UART_INSTANCE(0), NEW_TX_PIN, NEW_RX_PIN);

//If you indent to use HW Flow Control:
nrf_gpio_pin_set(NEW_RTS_PIN);
nrf_gpio_cfg_output(NEW_RTS_PIN);
nrf_gpio_cfg_input(NEW_CTS_PIN, NRF_GPIO_PIN_NOPULL);

nrf_uarte_hwfc_pins_set(NRF_DRV_UART_INSTANCE(0), NEW_RTS_PIN, NEW_CTS_PIN);

RE: Time multiplexing UART nrf52832

Keith Brafford — Sat, 12 Oct 2019 01:32:03 GMT

>'832 can support only one UART peripheral at a time

I wasn't aware of this, but would like to understand more fully. Can you point me to where that's discussed? Thx!