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Adding Raspberry Pi 4 UART pins 

Adds Raspberry Pi 4 UART pins.
This commit is contained in:
Yishen Miao 2021-01-29 11:23:25 -08:00
parent 0c2b2e7947
commit f8e5764aef
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1 changed files with 67 additions and 1 deletions
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src/en/overlay/uart.md
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@ -5,7 +5,7 @@ class: interface
type: pinout type: pinout
description: Raspberry Pi UART pins description: Raspberry Pi UART pins
url: http://elinux.org/RPi_Serial_Connection url: http://elinux.org/RPi_Serial_Connection
pincount: 2 pincount: 18
pin: pin:
'8': '8':
name: TXD / Transmit name: TXD / Transmit
@ -15,6 +15,70 @@ pin:
name: RXD / Receive name: RXD / Receive
direction: input direction: input
active: high active: high
'36':
name: CTS / Clear to Send
direction: both
active: high
'11':
name: RTS / Request to Send
direction: both
active: high
'27':
name: TXD / Transmit
direction: output
active: high
'28':
name: RXD / Receive
direction: input
active: high
'3':
name: CTS / Clear to Send
direction: both
active: high
'5':
name: RTS / Request to Send
direction: both
active: high
'7':
name: TXD / Transmit
direction: output
active: high
'29':
name: RXD / Receive
direction: input
active: high
'31':
name: CTS / Clear to Send
direction: both
active: high
'26':
name: RTS / Request to Send
direction: both
active: high
'24':
name: TXD / Transmit
direction: output
active: high
'21':
name: RXD / Receive
direction: input
active: high
'19':
name: CTS / Clear to Send
direction: both
active: high
'23':
name: RTS / Request to Send
direction: both
active: high
'32':
name: TXD / Transmit
direction: output
active: high
'33':
name: RXD / Receive
direction: input
active: high
--> -->
# UART - Universal Asynchronous Receiver/Transmitter # UART - Universal Asynchronous Receiver/Transmitter
--- ---
@ -29,6 +93,8 @@ UART is commonly used on the Pi as a convenient way to control it over the GPIO,
It can also be used as a way to interface an Arduino, bootloaded ATmega, ESP8266, etc with your Pi. Be careful with logic-levels between the devices though, for example the Pi is 3.3v and the Arduino is 5v. Connect the two and you might conjure up some magic blue smoke. It can also be used as a way to interface an Arduino, bootloaded ATmega, ESP8266, etc with your Pi. Be careful with logic-levels between the devices though, for example the Pi is 3.3v and the Arduino is 5v. Connect the two and you might conjure up some magic blue smoke.
Raspberry Pi 2/3 have two UARTs, uart1 and uart0. Raspberry Pi 4 has four additional UARTs available. Only uart0/1 is enabled over GPIO pin 14/15 by default. The additional UARTs can be enabled through the device tree overlays.
Assuming you have WiringPi-Python installed, the following python example opens the Pi's UART at 9600baud and puts 'hello world' Assuming you have WiringPi-Python installed, the following python example opens the Pi's UART at 9600baud and puts 'hello world'
```python ```python