MicroPython Forum (Archive)

Hi Peter, Thank you for your suggestions, I put a timeout in uart definition like: u2 = UART(2, 9600, tx=23,rx=22, timeout=20) This has resolved the issue :) . Below 20 ms (critical timeout), it is behaving like previously (accumulated data of 120 bytes). Also if I increase the baud rate to 19200, t...

Hi All, This is the updated problem statement. I am doing a loopback in this case (in earlier scenario, I was using a different device which was sending the UART data). from machine import UART import utime, uselect u1 = UART(1, 9600, tx=17,rx=16, parity=None, stop=1, ) u2 = UART(2, 9600, tx=23,rx=2...

Hello All, I am using micropython on esp32. I have got a query regarding uart.read() function. Here is a basic code for a uart read: from machine import UART, Pin import utime, uselect u2 = UART(2, 9600, stop=1, tx=23,rx=22, txbuf=512, rxbuf=512, timeout_char=2) count=0 while True: poll = uselect.po...

Hi All, I want to integrate gsm module provided in lobo esp32 port here in the micropython esp32 port. It will be very useful for all, in my opinion, who are using gsm hardware in there projects. So, I have : 1. copied the modgsm.c, modgsm.h file in the ports/esp32 folder 2. created a libs folder, i...

One method could be configuring uart wakeup (for lightsleep), however I don't see any function in micropython to enable this.

Regards.

Hi All, In my journey towards running Modbus on esp32, there is one more hurdle and this is power consumption. The esp has to remain turned on in active mode to look for the master query. As my device is an IoT device, it cannot afford to provide mAs of current continuously. So, I am looking for a s...

Thank you all for your inputs. Since I am working with the workaround for now, let's see if this works out well. I gave sleep time in between uart_wait_tx_done and for now it is working fine.

Regards

Hi Dave, Thank you for your reply. micropython uart.write() function returns when the data is written to Tx ring buffer (whenever space is available). uart.wait_tx_done checks the Tx_FIFO (hardware FIFO). I have given enough sleep in between write and wait_tx_done functions. May be, I am missing the...

I tried increasing the rx and tx buffer size from 256 to 512 in machine_uart.c. I was able to write multiple registers upto 25. But sometimes it was failing. I now, have the workaround. But if wait_tx_done() function works than the communication failures can be avoided.

Hi Robert, Thank you for your reply. Considering maximum number of registers to be written simultaneously are 50 (Modbus pdu length for writing this data 109 bytes), at 9600 baud, comes out to be 102 ms. I put 150 ms in the pdMS_TO_TICKS() as shown below and tried again. But I could not write even 2...