This document describes the SCPI command interface implemented in commands_uart.c for UART (Universal Asynchronous Receiver/Transmitter) control on the Melexis IO STM32 platform.

Overview

The commands_uart.c file provides SCPI-like commands for initializing, deinitializing, configuring, and performing data transfers over UART3 and UART4. The commands support baud rate, word length, stop bits, parity, oversampling, and read/write/exchange operations.

Supported Commands

Information

Command Pattern	Description
`:UART3:INFO`	Get UART3 settings
`:UART4:INFO`	Get UART4 settings

Initialization/Deinitialization

Command Pattern	Description
`:UART3:INIT`	Initialize UART3 TX0/RX0
`:UART4:INIT`	Initialize UART4 TXA0/RXA1
`:UART3:DEINIT`	Deinitialize UART3
`:UART4:DEINIT`	Deinitialize UART4

UART3 Configuration

Command Pattern	Description
`:UART3:BaudRate «val»`	Set UART3 baud rate (e.g. 9600, 115200)
`:UART3:BaudRate?`	Get UART3 baud rate
`:UART3:WordLength «0/1»`	Set UART3 word length (0=8bit, 1=9bit)
`:UART3:WordLength?`	Get UART3 word length
`:UART3:StopBit «1/2»`	Set UART3 stop bit
`:UART3:StopBit?`	Get UART3 stop bit
`:UART3:Parity «0/1/2»`	Set UART3 parity (0=None, 1=Odd, 2=Even)
`:UART3:Parity?`	Get UART3 parity
`:UART3:OverSampling «on/off»`	Set UART3 oversampling (on=16, off=8)
`:UART3:OverSampling?`	Get UART3 oversampling

UART4 Configuration

Command Pattern	Description
`:UART4:BaudRate «val»`	Set UART4 baud rate
`:UART4:BaudRate?`	Get UART4 baud rate
`:UART4:WordLength «0/1»`	Set UART4 word length (0=8bit, 1=9bit)
`:UART4:WordLength?`	Get UART4 word length
`:UART4:StopBit «1/2»`	Set UART4 stop bit
`:UART4:StopBit?`	Get UART4 stop bit
`:UART4:Parity «0/1/2»`	Set UART4 parity (0=None, 1=Odd, 2=Even)
`:UART4:Parity?`	Get UART4 parity
`:UART4:OverSampling «on/off»`	Set UART4 oversampling (on=16, off=8)
`:UART4:OverSampling?`	Get UART4 oversampling

UART Data Transfer

Command Pattern	Description
`:UART3:ReaD «count»`	Read data from UART3 (1-255 bytes)
`:UART3:WRite «data,...»`	Write data to UART3 (up to 256 bytes)
`:UART3:EXCHange «data,...»`	Write then read from UART3
`:UART4:ReaD «count»`	Read data from UART4 (1-255 bytes)
`:UART4:WRite «data,...»`	Write data to UART4 (up to 256 bytes)
`:UART4:EXCHange «data,...»`	Write then read from UART4

Command Details

INFO: Prints current UART settings (baud rate, word length, stop bits, parity, oversampling).
INIT/DEINIT: Initializes or deinitializes UART3/UART4 and their associated pins.
BaudRate/WordLength/StopBit/Parity/OverSampling: Configures or queries UART parameters.
ReaD/WRite/EXCHange: Reads, writes, or exchanges data with the UART peripheral.

Examples

Initialize UART3

Command sent:

:UART3:INIT\n

Response:

(OK)>

Set UART3 Baud Rate

Command sent:

:UART3:BaudRate 115200\n

Response:

(OK)>

Query UART3 Baud Rate

Command sent:

:UART3:BaudRate?\n

Response:

BaudRate=115200

(OK)>

Write Data to UART3

Command sent:

:UART3:WRite Hello\n

Response:

(OK)>

Read Data from UART3

Command sent:

:UART3:ReaD 5\n

Response:

Data: 48 65 6C 6C 6F

(OK)>

Error Example (Invalid Baud Rate)

Command sent:

:UART3:BaudRate 123\n

Response:

ERR: invalid baud rate

(Some error)>

Notes

Commands are case-insensitive.
The command interface is extensible; new features can be added by updating the command table and implementing the corresponding handler logic.
Some advanced features (e.g., timeout, last bit) are present as comments and can be enabled as needed.