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As I mentioned in issue #6332,

Browse Source 
there return of a read operation that times out with no data received
is inconsistent:
```
Adafruit CircuitPython 7.3.0-beta.1-31-g73f6b4867-dirty on 2022-04-30; Adafruit Feather RP2040 with rp2040
>>>
>>> import board, busio
>>> print(board.UART().read(5))
None

Adafruit CircuitPython 6.3.0 on 2021-06-01; FeatherS2 with ESP32S2
>>> import board,busio
>>> print(board.UART().read(5))
None

Adafruit CircuitPython 7.3.0-beta.1 on 2022-04-07; Adafruit Feather STM32F405 Express with STM32F405RG
>>> import board, busio
>>> print(board.UART().read(5))
None

Adafruit CircuitPython 7.3.0-beta.1-31-g73f6b4867-dirty on 2022-04-28; Teensy 4.1 with IMXRT1062DVJ6A
>>> import board, busio
>>> print(board.UART().read(5))
b''
```

Since I have a PR on this file anyway, I thought I would put in the change to make it consistent
with the other 3 board types I tried.  Can not say about any of the others.
This commit is contained in:
KurtE 2022-05-03 13:39:49 -07:00
parent 73f6b48676
commit 6378343bb3
1 changed files with 4 additions and 0 deletions
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4
ports/mimxrt10xx/common-hal/busio/UART.c
View File

@ -428,6 +428,10 @@ size_t common_hal_busio_uart_read(busio_uart_obj_t *self, uint8_t *data, size_t
uint32_t recvd = 0;
LPUART_TransferGetReceiveCount(self->uart, &self->handle, &recvd);
LPUART_TransferAbortReceive(self->uart, &self->handle);
if (recvd == 0) {
*errcode = EAGAIN;
return MP_STREAM_ERROR;
}
return recvd;
}