Diff: hal.cpp

Revision:

1:60184eda0066

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hal.cpp	Tue Mar 31 13:38:08 2015 +0000
@@ -0,0 +1,161 @@
+/*******************************************************************************
+ * 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
+
+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
+    // 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
+
+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 );
+}