QUERY · ISSUE

support for UART rx interrupt

openby embhobbbopened 2021-06-07updated 2021-06-07

I am using raspberry pi pico for my new project.
I was checking for example for UART receive interrupt. Do we have support for the same?
How can we achieve the UART RX interrupt?
I checked the micropython documentation but I didn't see support for RPi pico.

CANDIDATE · PULL REQUEST

rp2/machine_uart.c: Handle UART RX timeout IRQ.

closedby iabdalkaderopened 2021-12-09updated 2021-12-14

port-rp2

The pico-sdk 1.3.0 update in #8031 introduced a change that broke RP2 Bluetooth UART, and possibly machine_uart.c in general, which stops working right after UART is initialized. This commit https://github.com/raspberrypi/pico-sdk/commit/2622e9bc292a26cb576a80c3c7c30481dda04181 enables the UART receive timeout (RTIM) IRQ, which is asserted when the receive FIFO is not empty, and no more characters are received for a period of time. This PR makes sure the RTIM IRQ is handled and cleared in uart_service_interrupt.

Assessment

S Sonnet · high

Issue #7362 asks whether MicroPython exposes a user-facing UART RX interrupt API on RP2/Pico. PR #8074 fixes an internal driver bug where the RTIM (receive timeout interrupt) was not being handled/cleared inside uart_service_interrupt, causing UART to stop functioning after pico-sdk 1.3.0. The PR does not implement a user-accessible IRQ callback for UART RX; it repairs the internal interrupt machinery. Both touch ports/rp2/machine_uart.c and concern UART interrupt handling, but at different layers: the issue is a feature request for a public API, the PR is a regression fix for the internal driver.

Suggested action

Leave issue #7362 open. The PR fixes a prerequisite (UART not breaking on init), but does not implement user-facing UART RX interrupt callbacks. Maintainer may want to link the PR as context and track the feature request separately.

support for UART rx interrupt

rp2/machine_uart.c: Handle UART RX timeout IRQ.

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