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please usehttps://github.com/nimaltd/atc

This is the AT-Command STM32 LL Library

How to use this Library:

• Select "General peripheral Initalizion as a pair of '.c/.h' file per peripheral" on project settings.
• Enable USART and enable interrupt.
• Enable TX DMA is optional.
• Enable FREERTOS is optional.
• Add atc_callback() into USART IRQ callback.
• If Enabled TX DMA, Add atc_callback_txDMA() into DMA callback.
• Include Header and source into your project.
• Config "ATCConfig.h".
• Call atc_init( .. .. .. ).

#include "atc.h"char answerString[128];uint8_t foundAnswer; int main(){  atc_init(ATC_Element_0, USART3, 256, 50, "WIFI", DMA1, LL_DMA_STREAM_3);  foundAnswer = atc_sendAtCommand(ATC_Element_0, "AT\r\n", 3000, answerString, 128, 2, "OK\r\n", "ERROR\r\n");    while(1)  {    atc_process();  }}

in stm32f4xx_it.c

void USART3_IRQHandler(void){  atc_callback(ATC_Element_0);}// if use tx dmavoid DMA1_Stream3_IRQHandler(void){  atc_callback_txDMA(ATC_Element_0);}