UART0 use

[rapzak]

Hi,

Anyone have an idea why i can not read data from UART0 - i can TX the data and i have verified the data is on the line (both rx/tx)?

I have also compiled my own port with:
// Enable UART REPL for modules that have an external USB-UART and don't use native USB.
#define MICROPY_HW_ENABLE_UART_REPL (0)

from machine import UART
from machine import Pin
import time
p6 = Pin(6, Pin.OUT) # create output pin on GPIO0
p6.on() # set pin to "on" (high) level
s = UART(0, baudrate=600, tx=21, rx=20)#serial.Serial(port=portname, baudrate=600)
s.write(b'\x00')
rb = s.read(3)
print(rb)

result : None

I hve checked there is 3 bytes on the line with baud 600 - also i have checked the 0 i send is in baud 600.

The GPIO is to un-reset the chip...

/Kasper

[robert-hh]

p6 = Pin(6, Pin.OUT) # create output pin on GPIO0

The comment is confusing: This will set GPIO6, not GPIO0

About read after write: uart.read() will return that data which is present at the time of calling, which may be None. If you want read() to wait, you have to set a timeout.

[rapzak]

Hi,

Got it, it was just relly slow to reply, may be due to the 600baud...
So there was no issues...
/Kasper