villivateur
/
pinout.vvzero.com
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

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
No known key found for this signature in database
GPG Key ID: 7BCE00C41E176216
1 changed files with 67 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
src/en/overlay/uart.md
View File

@ -5,7 +5,7 @@ class: interface
type: pinout
description: Raspberry Pi UART pins
url: http://elinux.org/RPi_Serial_Connection
pincount: 2
pincount: 18
pin:
'8':
name: TXD / Transmit
@ -15,6 +15,70 @@ pin:
name: RXD / Receive
direction: input
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
---
@ -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.
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'
```python