File content as of revision 0:62d1edcc13d1:

/*******************************************************************************
 * Copyright (c) 2014 IBM Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    IBM Zurich Research Lab - initial API, implementation and documentation
 *    Semtech Apps Team       - Modified to support the MBED sx1276 driver
 *                              library.
 *                              Possibility to use original or Semtech's MBED
 *                              radio driver. The selection is done by setting
 *                              USE_SMTC_RADIO_DRIVER preprocessing directive
 *                              in lmic.h
 *******************************************************************************/
#include "mbed.h"
#include "lmic.h"
#include "mbed_debug.h"

#if USE_SMTC_RADIO_DRIVER

#else

extern void radio_irq_handler( u1_t dio );

static DigitalOut nss( D10 );
static SPI spi( D11, D12, D13 ); // ( mosi, miso, sclk )
 
static DigitalInOut rst( A0 );
static DigitalOut rxtx( A4 );
 
static InterruptIn dio0( D2 );
static InterruptIn dio1( D3 );
static InterruptIn dio2( D4 ); 

static void dio0Irq( void )
{
    radio_irq_handler( 0 );
}

static void dio1Irq( void )
{
    radio_irq_handler( 1 );
}
static void dio2Irq( void )
{
    radio_irq_handler( 2 );
}

#endif

static u1_t irqlevel = 0;
static u4_t ticks = 0;

static Timer timer;
static Ticker ticker;

static void reset_timer( void )
{
    ticks += timer.read_us( ) >> 6;
    timer.reset( );
}

void hal_init( void )
{
     __disable_irq( );
     irqlevel = 0;

#if USE_SMTC_RADIO_DRIVER

#else
    // configure input lines
    dio0.mode( PullDown );
    dio0.rise( dio0Irq );
    dio0.enable_irq( );
    dio1.mode( PullDown );   
    dio1.rise( dio1Irq );
    dio1.enable_irq( );
    dio2.mode( PullDown );
    dio2.rise( dio2Irq );
    dio2.enable_irq( );
    // configure reset line
    rst.input( );
    // configure spi
    spi.frequency( 8000000 );
    spi.format( 8, 0 );
    nss = 1;
#endif
    // configure timer
    timer.start( );
    ticker.attach_us( reset_timer, 10000000 ); // reset timer every 10sec
     __enable_irq( );
}

#if USE_SMTC_RADIO_DRIVER

#else

void hal_pin_rxtx( u1_t val )
{
    rxtx = !val;
}

void hal_pin_nss( u1_t val )
{
    nss = val;
}

void hal_pin_rst( u1_t val )
{
    if( val == 0 || val == 1 )
    { // drive pin
        rst.output( );
        rst = val;
    } 
    else
    { // keep pin floating
        rst.input( );
    }
}

u1_t hal_spi( u1_t out )
{
    return spi.write( out );
}

#endif

void hal_disableIRQs( void )
{
    __disable_irq( );
    irqlevel++;
}

void hal_enableIRQs( void )
{
    if( --irqlevel == 0 )
    {
        __enable_irq( );
    }
}

void hal_sleep( void )
{
    // NOP
}

u4_t hal_ticks( void )
{
    hal_disableIRQs( );
    int t = ticks + ( timer.read_us( ) >> 6 );
    hal_enableIRQs( );
    return t;
}

static u2_t deltaticks( u4_t time )
{
    u4_t t = hal_ticks( );
    s4_t d = time - t;
    if( d <= 0 )
    {
        return 0;    // in the past
    }
    if( ( d >> 16 ) != 0 )
    {
        return 0xFFFF; // far ahead
    }
    return ( u2_t )d;
}

void hal_waitUntil( u4_t time )
{
    while( deltaticks( time ) != 0 ); // busy wait until timestamp is reached
}

u1_t hal_checkTimer( u4_t time )
{
    return ( deltaticks( time ) < 2 );
}

void hal_failed( void )
{
    while( 1 );
}

//////////////////////////////////////////////////////////////////////
// DEBUG CODE BELOW (use CFG_DEBUG)
//////////////////////////////////////////////////////////////////////
#ifdef CFG_DEBUG

void debug_init( void )
{
    // print banner
    debug( "\r\n============== DEBUG STARTED ==============\r\n" );
}

void debug_char( u1_t c )
{
    debug( "%c", c );
}

void debug_hex( u1_t b )
{
    debug( "%02X", b );
}

void debug_buf( const u1_t* buf, u2_t len )
{
    while( len-- )
    {
        debug_hex( *buf++ );
        debug_char( ' ' );
    }
    debug_char( '\r' );
    debug_char( '\n' );
}

void debug_uint( u4_t v )
{
    for( s1_t n = 24; n >= 0; n -= 8 )
    {
        debug_hex( v >> n );
    }
}

void debug_str( const u1_t* str )
{
    while( *str )
    {
        debug_char( *str++ );
    }
}

void debug_val( const u1_t* label, u4_t val )
{
    debug_str( label );
    debug_uint( val );
    debug_char( '\r' );
    debug_char( '\n' );
}

void debug_led( u1_t val )
{
    debug_val( "LED = ", val );
}

void debug_event( int ev ) 
{
    static const u1_t* evnames[] = 
    {
        [EV_SCAN_TIMEOUT]   = "SCAN_TIMEOUT",
        [EV_BEACON_FOUND]   = "BEACON_FOUND",
        [EV_BEACON_MISSED]  = "BEACON_MISSED",
        [EV_BEACON_TRACKED] = "BEACON_TRACKED",
        [EV_JOINING]        = "JOINING",
        [EV_JOINED]         = "JOINED",
        [EV_RFU1]           = "RFU1",
        [EV_JOIN_FAILED]    = "JOIN_FAILED",
        [EV_REJOIN_FAILED]  = "REJOIN_FAILED",
        [EV_TXCOMPLETE]     = "TXCOMPLETE",
        [EV_LOST_TSYNC]     = "LOST_TSYNC",
        [EV_RESET]          = "RESET",
        [EV_RXCOMPLETE]     = "RXCOMPLETE",
        [EV_LINK_DEAD]      = "LINK_DEAD",
        [EV_LINK_ALIVE]     = "LINK_ALIVE",
    };
    debug( "%s\r\n", evnames[ev] );
}
#endif // CFG_DEBUG