irqUART: UART with rxd irq and frame irq

Discussion about programs, libraries and tools that work with MicroPython. Mostly these are provided by a third party.
Target audience: All users and developers of MicroPython.
Post Reply
Posts: 327
Joined: Sun Apr 17, 2016 1:55 pm

irqUART: UART with rxd irq and frame irq

Post by shaoziyang » Mon Jun 22, 2020 3:28 pm

machine.UART is not support RXD irq feature, it will brings some difficulties to uart programming in some cases.

irqUART give a alternative solutionuse, it use pin irq instead of uart irq. irqUART is simple, small and fast.

irqUART was tested on pyboard and esp32.
demo.jpg (63.66 KiB) Viewed 109 times

  1. define user RXD irq, frame irq (when needed).
  2. define a uart object.
  3. define irqUART object with uart, rxd pin, RXD irq, etc.
  4. init uart.
  • uart: uart object
  • rx_pin: uart rxd pin
  • rx_irq: user rxd irq, it can be None when not use rxd irq
  • frame_irq: user frame irq, it can be None if not use it
  • CHR_TMO: rxd irq delay (ms) after rx_pin irq, it depond on baudrate, rxbuf etc.
  • FRAME_TMO: frame irq delay (ms) after last char

Code: Select all

from machine import Pin, UART
from irqUART import irqUART

cnt = 0
def U1_RX_IRQ(t):
    global cnt
    n = 0
    while u1.any():
        d = u1.any()
        print('[', n, ']', cnt, d,

def U1_RX_FRAME_IRQ(t):
    global cnt
    print('FRAME end')
    cnt = 0

ui = irqUART(u1, Pin('B7'), U1_RX_IRQ, U1_RX_FRAME_IRQ)

Post Reply