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/*
* Copyright © 2011 Keith Packard <keithp@keithp.com>
*
* 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; version 2 of the License.
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
#include "ao_product.h"
static struct ao_companion_command ao_companion_command;
static const struct ao_companion_setup ao_companion_setup = {
.board_id = AO_idProduct_NUMBER,
.board_id_inverse = ~AO_idProduct_NUMBER,
.update_period = 50,
.channels = NUM_ADC
};
static void ao_spi_slave_recv(void)
{
uint8_t *buf;
uint8_t len;
len = sizeof (ao_companion_command);
buf = (uint8_t *) &ao_companion_command;
while (len--) {
while (!(SPSR & (1 << SPIF)))
;
*buf++ = SPDR;
}
/* Figure out the outbound data */
switch (ao_companion_command.command) {
case AO_COMPANION_SETUP:
buf = (uint8_t *) &ao_companion_setup;
len = sizeof (ao_companion_setup);
break;
case AO_COMPANION_FETCH:
buf = (uint8_t *) &ao_adc_ring[ao_adc_ring_prev(ao_adc_head)].adc;
len = NUM_ADC * sizeof (uint16_t);
break;
default:
return;
}
/* Send the outbound data */
while (len--) {
SPDR = *buf++;
while (!(SPSR & (1 << SPIF)))
;
}
(void) SPDR;
}
static uint8_t ao_spi_slave_running;
ISR(PCINT0_vect)
{
if ((PINB & (1 << PINB0)) == 0) {
if (!(PCMSK0 & (1 << PCINT1)))
PCMSK0 |= (1 << PCINT1);
else {
PCMSK0 &= ~(1 << PCINT1);
cli();
if (!ao_spi_slave_running) {
ao_spi_slave_running = 1;
ao_spi_slave_recv();
}
sei();
}
} else {
ao_spi_slave_running = 0;
}
}
void ao_spi_slave_debug(void) {
printf ("slave running %d\n", ao_spi_slave_running);
}
void
ao_spi_slave_init(void)
{
PCMSK0 |= (1 << PCINT0); /* Enable PCINT0 pin change */
PCICR |= (1 << PCIE0); /* Enable pin change interrupt */
DDRB = (DDRB & 0xf0) | (1 << 3);
SPCR = (0 << SPIE) | /* Disable SPI interrupts */
(1 << SPE) | /* Enable SPI */
(0 << DORD) | /* MSB first */
(0 << MSTR) | /* Slave mode */
(0 << CPOL) | /* Clock low when idle */
(0 << CPHA); /* Sample at leading clock edge */
}
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