74 lines
2.6 KiB
C
74 lines
2.6 KiB
C
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#ifndef HW_AFSK_H
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#define HW_AFSK_H
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#include "cfg/cfg_arch.h"
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#include <avr/io.h>
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struct Afsk;
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void hw_afsk_adcInit(int ch, struct Afsk *_ctx);
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void hw_afsk_dacInit(int ch, struct Afsk *_ctx);
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/**
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* Initialize the specified channel of the ADC for AFSK needs.
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* The adc should be configured to have a continuos stream of convertions.
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* For every convertion there must be an ISR that read the sample
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* and call afsk_adc_isr(), passing the context and the sample.
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*
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* \param ch channel to be used for AFSK demodulation.
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* \param ctx AFSK context (\see Afsk). This parameter must be saved and
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* passed back to afsk_adc_isr() for every convertion.
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*/
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/*
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* This macro will be called for AFSK initialization. We could implement everything here as a macro,
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* but since initialization is rather complicated we decided to split its own function. Such function
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* is defined in hw_afsk.c.
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* Remember: since this .c file is not created by the wizard, you must add it to your_project_name.mk.
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* If you create the file using BeRTOS SDK, it will be added for you.
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*/
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#define AFSK_ADC_INIT(ch, ctx) hw_afsk_adcInit(ch, ctx)
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/*
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* Activate strobe pin. We use it for debugging purposes. If you don't use it, simply
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* leave empty the following macros
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*/
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#define AFSK_STROBE_INIT() do { DDRB |= BV(5); } while (0)
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/*
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* Set the pin high. This macro is called at the beginning of the interrupt routine
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*/
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#define AFSK_STROBE_ON() do { PORTB |= BV(5); } while (0)
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/*
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* Set the pin low. This macro is called at the end of the interrupt routine
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*/
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#define AFSK_STROBE_OFF() do { PORTB &= ~BV(5); } while (0)
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/**
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* Initialize the specified channel of the DAC for AFSK needs.
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* The DAC has to be configured in order to call an ISR for every sample sent.
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* The DAC doesn't have to start the IRQ immediatly but have to wait
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* the AFSK driver to call AFSK_DAC_IRQ_START().
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* The ISR must then call afsk_dac_isr() passing the AFSK context.
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* \param ch DAC channel to be used for AFSK modulation.
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* \param ctx AFSK context (\see Afsk). This parameter must be saved and
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* passed back to afsk_dac_isr() for every convertion.
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*/
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#define AFSK_DAC_INIT(ch, ctx) do { (void)ch, (void)ctx; DDRD |= 0xF0; DDRB |= BV(3); } while (0)
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/**
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* Start DAC convertions on channel \a ch.
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* \param ch DAC channel.
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*/
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#define AFSK_DAC_IRQ_START(ch) do { (void)ch; extern bool hw_afsk_dac_isr; PORTB |= BV(3); hw_afsk_dac_isr = true; } while (0)
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/**
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* Stop DAC convertions on channel \a ch.
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* \param ch DAC channel.
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*/
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#define AFSK_DAC_IRQ_STOP(ch) do { (void)ch; extern bool hw_afsk_dac_isr; PORTB &= ~BV(3); hw_afsk_dac_isr = false; } while (0)
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#endif /* HW_AFSK_H */
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