README.md

gsm module library for STM32 LL

• Author: Nima Askari
• WebSite: https://www.github.com/NimaLTD
• Instagram: https://www.instagram.com/github.NimaLTD
• LinkedIn: https://www.linkedin.com/in/NimaLTD
• Youtube: https://www.youtube.com/@nimaltd

---

• This library using my 'atc' library, please download 'http://github.com/nimaltd/atc'.

---

• NONE RTOS Supported.
• RTOS V1 Supported.
• RTOS V2 Supported.

---

• SIM800C tested.
• SIM800 tested.
• SIM800H tested.

---

• Enable USART (LL Library) and RX interrupt.
• Enable a gpio as output and open drain to connect gsm power button.
• Add gsm and atc library to your project.
• Configure gsmConfig.h and atcConfig.h files.
• Add 'gsm_rxCallback()' to selected usart interrupt.
• Add 'gsm_callback_simDetectorISR()' to sim detector interrupt. //if use sim detector
• Call gsm_init().
• Call gsm_loop() in infinit loop.
• If using FREERTOS, please create a task for gsm with at least 512 word heap size.

---

None RTOS example:

• file atcConfig.h

#define	_ATC_DEBUG            0       //  use printf debug
#define	_ATC_RTOS             0       //  0: no rtos    1: cmsis_os v1    2: cmsis_os v2
#define	_ATC_RXSIZE           1024    //  at-command rx buffer size
#define	_ATC_SEARCH_CMD_MAX   5       //  maximum of answer in at-command
#define	_ATC_SEARCH_MAX       10      //  maximum	of always search in buffer
#define	_ATC_RXTIMEOUT_MS     50      //  rx timeout to get new packet

• file main.c

#include "gsm.h"

int main()
{
  gsm_init();
  gsm_power(true);
  gsm_waitForRegister(30);
  gsm_msg_send("+98xxxxxxx", "TEST MSG 1");
  while (1)
  {
    gsm_loop();
  }  
}

---

RTOS example:

• file atcConfig.h

#define	_ATC_DEBUG            0       //  use printf debug
#define	_ATC_RTOS             1       //  0: no rtos    1: cmsis_os v1    2: cmsis_os v2
#define	_ATC_RXSIZE           1024    //  at-command rx buffer size
#define	_ATC_SEARCH_CMD_MAX   5       //  maximum of answer in at-command
#define	_ATC_SEARCH_MAX       10      //  maximum	of always search in buffer
#define	_ATC_RXTIMEOUT_MS     50      //  rx timeout to get new packet

• file main.c

#include "gsm.h"

int main()
{
  ...  
}

void task_gsm(void const * argument)
{
  #if (_GSM_MAIN_POWER == 1)
    HAL_GPIO_WritePin(_GSM_PWR_CTRL_GPIO, _GSM_PWR_CTRL_PIN, GPIO_PIN_RESET);
    gsm_delay(1000);
  #endif
  gsm_init();
  gsm_power(true);
  #if(_GSM_SIM_DETECTOR == 1)
    if(HAL_GPIO_ReadPin(_GSM_SIM_DET_GPIO, _GSM_SIM_DET_PIN))
    {
      gsm_power(false);
      #if(_GSM_RTOS != 0)
        vTaskSuspend(NULL);
      #endif
    }
  #endif
  while (1)
  {
    gsm_loop();
  }
}

void task_other(void const * argument)
{
  //gsm_waitForRegister(30);
  gsm_msg_send("+98xxxxxxx", "TEST MSG 1");
  while (1)
  {    
    osDelay(10000);
  }
}

#if(_GSM_SIM_DETECTOR == 1)
void gsm_callback_simDetectorISR()
{
  gsm.status.simDetCangeInterruptFlag = 1;
  #if(_GSM_RTOS != 0)
    xTaskResumeFromISR(task_gsm);
  #endif
}
#endif