Add example for arduino board.

[bertos.git] / boards / arduino / hw / hw_afsk.c

diff --git a/boards/arduino/hw/hw_afsk.c b/boards/arduino/hw/hw_afsk.c
new file mode 100644 (file)
index 0000000..892b2a3
--- /dev/null
+++ b/boards/arduino/hw/hw_afsk.c
@@ -0,0 +1,97 @@
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
+ * All Rights Reserved.
+ * -->
+ *
+ * \brief AFSK modem hardware-specific definitions.
+ *
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+
+#include "hw_afsk.h"
+
+#include <net/afsk.h>
+#include <cpu/irq.h>
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+
+/*
+ * Here we are using only one modem. If you need to receive
+ * from multiple modems, you need to define an array of contexts.
+ */
+static Afsk *ctx;
+
+void hw_afsk_adcInit(int ch, Afsk *_ctx)
+{
+       ctx = _ctx;
+       ASSERT(ch <= 5);
+
+       AFSK_STROBE_INIT();
+       AFSK_STROBE_OFF();
+       /* Set prescaler to clk/8 (2 MHz), CTC, top = ICR1 */
+       TCCR1A = 0;
+       TCCR1B = BV(CS11) | BV(WGM13) | BV(WGM12);
+       /* Set max value to obtain a 9600Hz freq */
+       ICR1 = ((CPU_FREQ / 8) / 9600) - 1;
+
+       /* Set reference to AVCC (5V), select CH */
+       ADMUX = BV(REFS0) | ch;
+
+       DDRC &= ~BV(ch);
+       PORTC &= ~BV(ch);
+       DIDR0 |= BV(ch);
+
+       /* Set autotrigger on Timer1 Input capture flag */
+       ADCSRB = BV(ADTS2) | BV(ADTS1) | BV(ADTS0);
+       /* Enable ADC, autotrigger, 1MHz, IRQ enabled */
+       /* We are using the ADC a bit out of specifications otherwise it's not fast enough for our
+        * purposes */
+       ADCSRA = BV(ADEN) | BV(ADSC) | BV(ADATE) | BV(ADIE) | BV(ADPS2);
+}
+
+
+bool hw_afsk_dac_isr;
+
+/*
+ * This is how you declare an ISR.
+ */
+DECLARE_ISR(ADC_vect)
+{
+       TIFR1 = BV(ICF1);
+       afsk_adc_isr(ctx, ((int16_t)((ADC) >> 2) - 128));
+       if (hw_afsk_dac_isr)
+               PORTD = afsk_dac_isr(ctx) & 0xF0;
+       else
+               PORTD = 128;
+}