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sx126x_hal.c
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sx126x_hal.c
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/*!
* \file sx126x_hal.c
*
* \brief Implements the sx126x radio HAL functions
*
* The Clear BSD License
* Copyright Semtech Corporation 2021. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted (subject to the limitations in the disclaimer
* below) provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Semtech corporation nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY
* THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SEMTECH CORPORATION BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* -----------------------------------------------------------------------------
* --- DEPENDENCIES ------------------------------------------------------------
*/
#include <stdint.h> // C99 types
#include <stdbool.h> // bool type
#include "sx126x_hal.h"
#include "smtc_hal_gpio.h"
#include "smtc_hal_spi.h"
#include "smtc_hal_mcu.h"
#include "modem_pinout.h"
/*
* -----------------------------------------------------------------------------
* --- PRIVATE MACROS-----------------------------------------------------------
*/
/*
* -----------------------------------------------------------------------------
* --- PRIVATE CONSTANTS -------------------------------------------------------
*/
/*
* -----------------------------------------------------------------------------
* --- PRIVATE TYPES -----------------------------------------------------------
*/
typedef enum
{
RADIO_SLEEP,
RADIO_AWAKE
} radio_sleep_mode_t;
/*
* -----------------------------------------------------------------------------
* --- PRIVATE VARIABLES -------------------------------------------------------
*/
// This variable will hold the current sleep status of the radio
static radio_sleep_mode_t radio_mode = RADIO_AWAKE;
/*
* -----------------------------------------------------------------------------
* --- PRIVATE FUNCTIONS DECLARATION -------------------------------------------
*/
/**
* @brief Wait until radio busy pin returns to 0
*/
static void sx126x_hal_wait_on_busy( void );
/**
* @brief Check if device is ready to receive spi transaction.
* @remark If the device is in sleep mode, it will awake it and wait until it is ready
*/
static void sx126x_hal_check_device_ready( void );
/*
* -----------------------------------------------------------------------------
* --- PUBLIC FUNCTIONS DEFINITION ---------------------------------------------
*/
sx126x_hal_status_t sx126x_hal_write( const void* context, const uint8_t* command, const uint16_t command_length,
const uint8_t* data, const uint16_t data_length )
{
sx126x_hal_check_device_ready( );
// Put NSS low to start spi transaction
hal_gpio_set_value( RADIO_NSS, 0 );
for( uint16_t i = 0; i < command_length; i++ )
{
hal_spi_in_out( RADIO_SPI_ID, command[i] );
}
for( uint16_t i = 0; i < data_length; i++ )
{
hal_spi_in_out( RADIO_SPI_ID, data[i] );
}
// Put NSS high as the spi transaction is finished
hal_gpio_set_value( RADIO_NSS, 1 );
// 0x84 - SX126x_SET_SLEEP opcode. In sleep mode the radio dio is struck to 1 => do not test it
if( command[0] != 0x84 )
{
sx126x_hal_check_device_ready( );
}
else
{
radio_mode = RADIO_SLEEP;
}
return SX126X_HAL_STATUS_OK;
}
sx126x_hal_status_t sx126x_hal_read( const void* context, const uint8_t* command, const uint16_t command_length,
uint8_t* data, const uint16_t data_length )
{
sx126x_hal_check_device_ready( );
// Put NSS low to start spi transaction
hal_gpio_set_value( RADIO_NSS, 0 );
for( uint16_t i = 0; i < command_length; i++ )
{
hal_spi_in_out( RADIO_SPI_ID, command[i] );
}
for( uint16_t i = 0; i < data_length; i++ )
{
data[i] = hal_spi_in_out( RADIO_SPI_ID, 0 );
}
// Put NSS high as the spi transaction is finished
hal_gpio_set_value( RADIO_NSS, 1 );
return SX126X_HAL_STATUS_OK;
}
sx126x_hal_status_t sx126x_hal_reset( const void* context )
{
hal_gpio_set_value( RADIO_NRST, 0 );
hal_mcu_wait_us( 5000 );
hal_gpio_set_value( RADIO_NRST, 1 );
hal_mcu_wait_us( 5000 );
radio_mode = RADIO_AWAKE;
return SX126X_HAL_STATUS_OK;
}
sx126x_hal_status_t sx126x_hal_wakeup( const void* context )
{
sx126x_hal_check_device_ready( );
return SX126X_HAL_STATUS_OK;
}
/*
* -----------------------------------------------------------------------------
* --- PRIVATE FUNCTIONS DEFINITION --------------------------------------------
*/
static void sx126x_hal_wait_on_busy( void )
{
while( hal_gpio_get_value( RADIO_BUSY_PIN ) == 1 )
{
};
}
static void sx126x_hal_check_device_ready( void )
{
if( radio_mode != RADIO_SLEEP )
{
sx126x_hal_wait_on_busy( );
}
else
{
// Busy is HIGH in sleep mode, wake-up the device
hal_gpio_set_value( RADIO_NSS, 0 );
sx126x_hal_wait_on_busy( );
hal_gpio_set_value( RADIO_NSS, 1 );
radio_mode = RADIO_AWAKE;
}
}