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#ifndef MYRADIO_PHY_TRANSMITTER_H_
#define MYRADIO_PHY_TRANSMITTER_H_
/* Lowlevel transmitter definitions.
* These functions do poke with the actual TX hardware.
*/
#include <avr/io.h>
/* Our transmitter is a trivial radio transmitter module that
* will amplitude- (or frequency-) modulate any bit that is set
* immediately to the wireless medium.
* We have two output pins on the digital PHY, which are connected
* via a trivial R2R network to the Analog part of the PHY.
* One of the digital pins is the transmitter-power pin and one is
* the data bit signal.
* So the way the radio sees the data on its pin is:
* 0V = transmitter powered off
* about 4V = Logical zero
* 5V = Logical one
* These voltage levels are generated by the analog (R2R network) from
* the two digital transmitter pins.
*
* An example for a possible radio hardware is this:
* http://www.conrad.de/goto.php?artikel=130428
*/
#define TRANSMITTER_PORT PORTC
#define TRANSMITTER_DDR DDRC
#define TRANSMITTER_POWERON 1 /* Power-ON bit */
#define TRANSMITTER_DATABIT 2 /* Data bit */
static inline void transmitter_data_bit_set(bool high)
{
if (high)
TRANSMITTER_PORT |= (1 << TRANSMITTER_DATABIT);
else
TRANSMITTER_PORT &= ~(1 << TRANSMITTER_DATABIT);
}
static inline void transmitter_enable(void)
{
transmitter_data_bit_set(0);
TRANSMITTER_PORT |= (1 << TRANSMITTER_POWERON);
}
static inline void transmitter_disable(void)
{
transmitter_data_bit_set(0);
TRANSMITTER_PORT &= ~(1 << TRANSMITTER_POWERON);
}
static inline void transmitter_initialize(void)
{
transmitter_data_bit_set(0);
TRANSMITTER_PORT &= ~(1 << TRANSMITTER_POWERON);
TRANSMITTER_DDR |= (1 << TRANSMITTER_POWERON) | (1 << TRANSMITTER_DATABIT);
}
#endif /* MYRADIO_PHY_TRANSMITTER_H_ */
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