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/**
******************************************************************************
* @file stm32wb_at.c
* @author MCD Application Team
* @brief Transport layer.
*
******************************************************************************
* @attention
*
* Copyright (c) 2021 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32wb_at.h"
#include "stm32wb_at_ll.h"
#include "stm32wb_at_client.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macros ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
uint8_t *buffer_rx;
uint8_t buffer_rx_size;
uint8_t buffer_rx_cursor;
char str_received[64];
/* Private function prototypes -----------------------------------------------*/
/* Exported functions --------------------------------------------------------*/
/**
* @brief Init the at module
* @param None
* @retval 0 in case of success, an error code otherwise
*/
uint8_t stm32wb_at_Init(uint8_t *buff_rx, uint8_t buff_rx_size)
{
uint8_t status;
if(buff_rx_size >= sizeof(str_received))
{
buffer_rx_size = buff_rx_size;
buffer_rx = buff_rx;
(void)memset(&buffer_rx[0], 0, buffer_rx_size);
buffer_rx_cursor = 0;
(void)memset(&str_received[0], 0, sizeof(str_received));
stm32wb_at_ll_Async_receive(0);
status = 0;
}
else
{
status = 1;
}
return status;
}
/**
* @brief Accumulate bytes received and detects a new frame received
* @param byte the last byte received
* @retval 0 in case of success, an error code otherwise
*/
uint8_t stm32wb_at_Received(uint8_t byte)
{
uint8_t status, i;
if(buffer_rx_cursor < buffer_rx_size)
{
buffer_rx[buffer_rx_cursor] = byte;
buffer_rx_cursor++;
/* check if we have received the command delimiter LF */
if(byte == (uint8_t)'\n')
{
/* remove CR if any */
if(buffer_rx_cursor > 2U)
{
if( buffer_rx[buffer_rx_cursor - 2U] == (uint8_t)'\r')
{
buffer_rx[buffer_rx_cursor - 1U] = 0U;
buffer_rx[buffer_rx_cursor - 2U] = (uint8_t)'\n';
buffer_rx_cursor--;
}
}
/* remove the last \n */
buffer_rx[buffer_rx_cursor - 1U] = 0U;
buffer_rx_cursor--;
/* remove null leading caractere if any*/
if( buffer_rx[0] == 0U)
{
i = 1U;
while(buffer_rx[i] != 0U)
{
buffer_rx[i - 1U] = buffer_rx[i];
i++;
}
buffer_rx[i - 1U] = 0U;
}
/* check if command is long enough */
if(buffer_rx_cursor > 1U)
{
(void)strcpy(&str_received[0], (char*)&buffer_rx[0]);
stm32wb_at_ll_Async_receive((uint8_t)sizeof(str_received));
(void)memset(&buffer_rx[0], 0, buffer_rx_size);
buffer_rx_cursor = 0U;
status = stm32wb_at_Process_rx_frame(str_received);
(void)memset(&str_received[0], 0, sizeof(str_received));
}
else
{
(void)memset(&buffer_rx[0], 0, buffer_rx_size);
buffer_rx_cursor = 0U;
stm32wb_at_ll_Async_receive(0);
}
}
else
{
stm32wb_at_ll_Async_receive(0);
}
status = 0U;
}
else
{
status = 1U;
}
return status;
}
/**
* @brief Process a frame received
* @param str pointer string to process
* @retval 0 in case of success, an error code otherwise
*/
__weak uint8_t stm32wb_at_Process_rx_frame(char * str)
{
(void)stm32wb_at_client_Process_rx_frame(str);
return 0;
}
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