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/*
* Copyright 2014 Ettus Research LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <avr/io.h>
#include <avrlibdefs.h>
#include <debug.h>
#include <octoclock.h>
#include <clkdist.h>
#include <state.h>
// Global state variables
volatile bool g_ext_ref_present = false;
volatile bool g_gps_present = false;
volatile switch_pos_t g_switch_pos = PREFER_INTERNAL;
volatile ref_t g_ref = NO_REF;
void led(led_t which, bool on){
// selects the proper bit
uint8_t LED = 0x20 << which;
if(on)
PORTC |= LED;
else
PORTC &= ~LED;
}
void leds_off(void){
led(LED_TOP, false);
led(LED_MIDDLE, false);
led(LED_BOTTOM, false);
}
static void force_internal(void){
led(LED_TOP, true);
led(LED_MIDDLE, false);
led(LED_BOTTOM, true);
// Tell ClkDist chip to use internal signals
cli();
setup_TI_CDCE18005(Primary_GPS);
sei();
// Set PPS to internal
PORTA |= (1<<PA6);
}
static void force_external(void){
led(LED_TOP, false);
led(LED_MIDDLE, true);
led(LED_BOTTOM, true);
// Tell Clkdist chip to use external signals
cli();
setup_TI_CDCE18005(Secondary_Ext);
sei();
// Set PPS to external
PORTA &= ~(1<<PA6);
}
void prefer_internal(void){
// If internal is NOT OK, then force external
if(g_gps_present)
force_internal();
else if(g_ext_ref_present)
force_external();
else
leds_off();
}
void prefer_external(void){
// If external is NOT OK, then force internal
if(g_ext_ref_present)
force_external();
else if(g_gps_present)
force_internal();
else
leds_off();
}
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