QUERY · ISSUE
esp8266: Necessity for UART flush
port-esp8266
This is rather recommendation than issue. The code below sends a string message from UART1 and is supposed to pull the output pin LOW :
mypin.on()
uart1.write("a long sentence")
mypin.off()
when I checked the signal (part tx and output) with logic analyzer, I saw that pin is pulled low long before the uart transmission has been completed. A function like uart.flash() which checks the relevant uart status bits for completion of the transmission would be very handy.
CANDIDATE · ISSUE
Esp32: Add explicit "wait_tx_done" method to UART
port-esp32
Hello folks,
Faced with issue, I cannot control time when UART TX done from MicroPython.
Use case is next:
- I've tried to communicate by raw RS485 and I should know when exactly disable TX pin.
Currently, there are couple workarounds (judged by sources and undocumented). In these methods called uart_wait_tx_done():
- Via
init()method. E.g. send bytes and callinit(). But if implementation will be changed in future such method stopped worked. Especially this method is very strange to call in the middle of the UART operation. - Via
sendbreak()method. But also undocumented plus it always sends\x00
Proposal:
- I think it would be good to add explicit method for waiting UART TX done.