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/*!
* \file main.c
*
* \brief Ping-Pong implementation
*
* \copyright Revised BSD License, see section \ref LICENSE.
*
* \code
* ______ _
* / _____) _ | |
* ( (____ _____ ____ _| |_ _____ ____| |__
* \____ \| ___ | (_ _) ___ |/ ___) _ \
* _____) ) ____| | | || |_| ____( (___| | | |
* (______/|_____)_|_|_| \__)_____)\____)_| |_|
* (C)2013-2017 Semtech
*
* \endcode
*
* \author Miguel Luis ( Semtech )
*
* \author Gregory Cristian ( Semtech )
*/
#include <string.h>
#include "board.h"
#include "gpio.h"
#include "delay.h"
#include "timer.h"
#include "radio.h"
#if defined( REGION_AS923 )
#define RF_FREQUENCY 923000000 // Hz
#elif defined( REGION_AU915 )
#define RF_FREQUENCY 915000000 // Hz
#elif defined( REGION_CN470 )
#define RF_FREQUENCY 470000000 // Hz
#elif defined( REGION_CN779 )
#define RF_FREQUENCY 779000000 // Hz
#elif defined( REGION_EU433 )
#define RF_FREQUENCY 433000000 // Hz
#elif defined( REGION_EU868 )
#define RF_FREQUENCY 868000000 // Hz
#elif defined( REGION_KR920 )
#define RF_FREQUENCY 920000000 // Hz
#elif defined( REGION_IN865 )
#define RF_FREQUENCY 865000000 // Hz
#elif defined( REGION_US915 )
#define RF_FREQUENCY 915000000 // Hz
#elif defined( REGION_RU864 )
#define RF_FREQUENCY 864000000 // Hz
#else
#error "Please define a frequency band in the compiler options."
#endif
#define TX_OUTPUT_POWER 14 // dBm
#if defined( USE_MODEM_LORA )
#define LORA_BANDWIDTH 0 // [0: 125 kHz,
// 1: 250 kHz,
// 2: 500 kHz,
// 3: Reserved]
#define LORA_SPREADING_FACTOR 7 // [SF7..SF12]
#define LORA_CODINGRATE 1 // [1: 4/5,
// 2: 4/6,
// 3: 4/7,
// 4: 4/8]
#define LORA_PREAMBLE_LENGTH 8 // Same for Tx and Rx
#define LORA_SYMBOL_TIMEOUT 5 // Symbols
#define LORA_FIX_LENGTH_PAYLOAD_ON false
#define LORA_IQ_INVERSION_ON false
#elif defined( USE_MODEM_FSK )
#define FSK_FDEV 25000 // Hz
#define FSK_DATARATE 50000 // bps
#define FSK_BANDWIDTH 50000 // Hz
#define FSK_AFC_BANDWIDTH 83333 // Hz
#define FSK_PREAMBLE_LENGTH 5 // Same for Tx and Rx
#define FSK_FIX_LENGTH_PAYLOAD_ON false
#else
#error "Please define a modem in the compiler options."
#endif
typedef enum
{
LOWPOWER,
RX,
RX_TIMEOUT,
RX_ERROR,
TX,
TX_TIMEOUT,
}States_t;
#define RX_TIMEOUT_VALUE 1000
#define BUFFER_SIZE 64 // Define the payload size here
const uint8_t PingMsg[] = "PING";
const uint8_t PongMsg[] = "PONG";
uint16_t BufferSize = BUFFER_SIZE;
uint8_t Buffer[BUFFER_SIZE];
States_t State = LOWPOWER;
int8_t RssiValue = 0;
int8_t SnrValue = 0;
/*!
* Radio events function pointer
*/
static RadioEvents_t RadioEvents;
/*!
* LED GPIO pins objects
*/
extern Gpio_t Led1;
extern Gpio_t Led2;
/*!
* \brief Function to be executed on Radio Tx Done event
*/
void OnTxDone( void );
/*!
* \brief Function to be executed on Radio Rx Done event
*/
void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr );
/*!
* \brief Function executed on Radio Tx Timeout event
*/
void OnTxTimeout( void );
/*!
* \brief Function executed on Radio Rx Timeout event
*/
void OnRxTimeout( void );
/*!
* \brief Function executed on Radio Rx Error event
*/
void OnRxError( void );
/**
* Main application entry point.
*/
int main( void )
{
bool isMaster = true;
uint8_t i;
// Target board initialization
BoardInitMcu( );
BoardInitPeriph( );
// Radio initialization
RadioEvents.TxDone = OnTxDone;
RadioEvents.RxDone = OnRxDone;
RadioEvents.TxTimeout = OnTxTimeout;
RadioEvents.RxTimeout = OnRxTimeout;
RadioEvents.RxError = OnRxError;
Radio.Init( &RadioEvents );
Radio.SetChannel( RF_FREQUENCY );
#if defined( USE_MODEM_LORA )
Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH,
LORA_SPREADING_FACTOR, LORA_CODINGRATE,
LORA_PREAMBLE_LENGTH, LORA_FIX_LENGTH_PAYLOAD_ON,
true, 0, 0, LORA_IQ_INVERSION_ON, 3000 );
Radio.SetRxConfig( MODEM_LORA, LORA_BANDWIDTH, LORA_SPREADING_FACTOR,
LORA_CODINGRATE, 0, LORA_PREAMBLE_LENGTH,
LORA_SYMBOL_TIMEOUT, LORA_FIX_LENGTH_PAYLOAD_ON,
0, true, 0, 0, LORA_IQ_INVERSION_ON, true );
Radio.SetMaxPayloadLength( MODEM_LORA, BUFFER_SIZE );
#elif defined( USE_MODEM_FSK )
Radio.SetTxConfig( MODEM_FSK, TX_OUTPUT_POWER, FSK_FDEV, 0,
FSK_DATARATE, 0,
FSK_PREAMBLE_LENGTH, FSK_FIX_LENGTH_PAYLOAD_ON,
true, 0, 0, 0, 3000 );
Radio.SetRxConfig( MODEM_FSK, FSK_BANDWIDTH, FSK_DATARATE,
0, FSK_AFC_BANDWIDTH, FSK_PREAMBLE_LENGTH,
0, FSK_FIX_LENGTH_PAYLOAD_ON, 0, true,
0, 0,false, true );
Radio.SetMaxPayloadLength( MODEM_FSK, BUFFER_SIZE );
#else
#error "Please define a frequency band in the compiler options."
#endif
Radio.Rx( RX_TIMEOUT_VALUE );
while( 1 )
{
switch( State )
{
case RX:
if( isMaster == true )
{
if( BufferSize > 0 )
{
if( strncmp( ( const char* )Buffer, ( const char* )PongMsg, 4 ) == 0 )
{
// Indicates on a LED that the received frame is a PONG
GpioToggle( &Led1 );
// Send the next PING frame
Buffer[0] = 'P';
Buffer[1] = 'I';
Buffer[2] = 'N';
Buffer[3] = 'G';
// We fill the buffer with numbers for the payload
for( i = 4; i < BufferSize; i++ )
{
Buffer[i] = i - 4;
}
DelayMs( 1 );
Radio.Send( Buffer, BufferSize );
}
else if( strncmp( ( const char* )Buffer, ( const char* )PingMsg, 4 ) == 0 )
{ // A master already exists then become a slave
isMaster = false;
GpioToggle( &Led2 ); // Set LED off
Radio.Rx( RX_TIMEOUT_VALUE );
}
else // valid reception but neither a PING or a PONG message
{ // Set device as master ans start again
isMaster = true;
Radio.Rx( RX_TIMEOUT_VALUE );
}
}
}
else
{
if( BufferSize > 0 )
{
if( strncmp( ( const char* )Buffer, ( const char* )PingMsg, 4 ) == 0 )
{
// Indicates on a LED that the received frame is a PING
GpioToggle( &Led1 );
// Send the reply to the PONG string
Buffer[0] = 'P';
Buffer[1] = 'O';
Buffer[2] = 'N';
Buffer[3] = 'G';
// We fill the buffer with numbers for the payload
for( i = 4; i < BufferSize; i++ )
{
Buffer[i] = i - 4;
}
DelayMs( 1 );
Radio.Send( Buffer, BufferSize );
}
else // valid reception but not a PING as expected
{ // Set device as master and start again
isMaster = true;
Radio.Rx( RX_TIMEOUT_VALUE );
}
}
}
State = LOWPOWER;
break;
case TX:
// Indicates on a LED that we have sent a PING [Master]
// Indicates on a LED that we have sent a PONG [Slave]
GpioToggle( &Led2 );
Radio.Rx( RX_TIMEOUT_VALUE );
State = LOWPOWER;
break;
case RX_TIMEOUT:
case RX_ERROR:
if( isMaster == true )
{
// Send the next PING frame
Buffer[0] = 'P';
Buffer[1] = 'I';
Buffer[2] = 'N';
Buffer[3] = 'G';
for( i = 4; i < BufferSize; i++ )
{
Buffer[i] = i - 4;
}
DelayMs( 1 );
Radio.Send( Buffer, BufferSize );
}
else
{
Radio.Rx( RX_TIMEOUT_VALUE );
}
State = LOWPOWER;
break;
case TX_TIMEOUT:
Radio.Rx( RX_TIMEOUT_VALUE );
State = LOWPOWER;
break;
case LOWPOWER:
default:
// Set low power
break;
}
BoardLowPowerHandler( );
// Process Radio IRQ
if( Radio.IrqProcess != NULL )
{
Radio.IrqProcess( );
}
}
}
void OnTxDone( void )
{
Radio.Sleep( );
State = TX;
}
void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr )
{
Radio.Sleep( );
BufferSize = size;
memcpy( Buffer, payload, BufferSize );
RssiValue = rssi;
SnrValue = snr;
State = RX;
}
void OnTxTimeout( void )
{
Radio.Sleep( );
State = TX_TIMEOUT;
}
void OnRxTimeout( void )
{
Radio.Sleep( );
State = RX_TIMEOUT;
}
void OnRxError( void )
{
Radio.Sleep( );
State = RX_ERROR;
}
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