UART - Send and Receive
Materials
- AmebaD [ AMB23 / AMB21 / AMB22 / BW16 / BW16-TypeC ] x 1
- USB to TTL Adapter x 1
Example
UART is a very versatile communication protocol and almost an essential part of a microcontroller. A TTL USB to Serial module is an IC that helps to translate UART signal to USB signal so that we can see uart log printed on our PC. This module is often found on many development boards, including ameba. However, the module on Ameba is reserved for LOG UART and Firmware uploading, that is why we need a separate module to communicate between ameba and PC.
AMB21/AMB22
There are 2 sets of UART available to Micropython users.
| Unit | TX | RX |
|---|---|---|
|
|
PA_21 |
PA_22 |
|
3 |
PA_26 |
PA_25 |
AMB23
There are 2 sets of UART available to Micropython users.
| Unit | TX | RX |
|---|---|---|
|
1 |
PB_1 |
PB_2 |
|
2 |
PA_21 |
PA_22 |
BW16/BW16-TypeC
There are 1 set of UART available to Micropython users.
| Unit | TX | RX |
|---|---|---|
|
|
PB_1 |
PB_2 |
Code
Copy and execute each line one by one to see its effect.
from machine import UART
uart = UART(tx="PB_1", rx= "PB_2")
uart.write('hello')
uart.write('123')
uart.read(5)
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