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/*
* Copyright © 2012 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; 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao.h>
#include <ao_radio_spi.h>
#include <ao_radio_cmac.h>
static __xdata struct ao_radio_spi_reply ao_radio_spi_reply;
static __xdata struct ao_radio_spi_request ao_radio_spi_request;
static __xdata uint8_t slave_state;
static void
ao_radio_slave_low(void)
{
uint16_t i;
if (slave_state != 1)
ao_panic(1);
ao_gpio_set(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 0);
for (i = 0; i < 1000; i++)
ao_arch_nop();
slave_state = 0;
}
static void
ao_radio_slave_high(void)
{
if (slave_state != 0)
ao_panic(2);
ao_gpio_set(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 1);
slave_state = 1;
}
static void
ao_radio_slave_spi(void)
{
ao_spi_get_slave(AO_RADIO_SLAVE_BUS);
for (;;) {
ao_spi_recv(&ao_radio_spi_request,
(2 << 13) | sizeof (ao_radio_spi_request),
AO_RADIO_SLAVE_BUS);
ao_radio_slave_high();
ao_spi_recv_wait();
switch (ao_radio_spi_request.request) {
case AO_RADIO_SPI_RECV:
/* XXX monitor CS to interrupt the receive */
ao_config.radio_setting = ao_radio_spi_request.setting;
ao_led_on(AO_LED_RX);
ao_radio_spi_reply.status = ao_radio_recv(&ao_radio_spi_reply.payload,
ao_radio_spi_request.recv_len,
ao_radio_spi_request.timeout);
ao_led_off(AO_LED_RX);
ao_radio_spi_reply.rssi = 0;
ao_spi_send(&ao_radio_spi_reply,
AO_RADIO_SPI_REPLY_HEADER_LEN + ao_radio_spi_request.recv_len,
AO_RADIO_SLAVE_BUS);
ao_radio_slave_low();
ao_spi_send_wait();
continue;
case AO_RADIO_SPI_CMAC_RECV:
ao_config.radio_setting = ao_radio_spi_request.setting;
ao_led_on(AO_LED_RX);
ao_radio_spi_reply.status = ao_radio_cmac_recv(&ao_radio_spi_reply.payload,
ao_radio_spi_request.recv_len,
ao_radio_spi_request.timeout);
ao_led_off(AO_LED_RX);
ao_radio_spi_reply.rssi = ao_radio_cmac_rssi;
ao_spi_send(&ao_radio_spi_reply,
AO_RADIO_SPI_REPLY_HEADER_LEN + ao_radio_spi_request.recv_len,
AO_RADIO_SLAVE_BUS);
ao_radio_slave_low();
ao_spi_send_wait();
continue;
case AO_RADIO_SPI_SEND:
ao_config.radio_setting = ao_radio_spi_request.setting;
ao_led_on(AO_LED_TX);
ao_radio_send(&ao_radio_spi_request.payload,
ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
ao_led_off(AO_LED_TX);
break;
case AO_RADIO_SPI_CMAC_SEND:
ao_config.radio_setting = ao_radio_spi_request.setting;
ao_led_on(AO_LED_TX);
ao_radio_cmac_send(&ao_radio_spi_request.payload,
ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
ao_led_off(AO_LED_TX);
break;
case AO_RADIO_SPI_CMAC_KEY:
ao_xmemcpy(&ao_config.aes_key, ao_radio_spi_request.payload, AO_AES_LEN);
break;
case AO_RADIO_SPI_TEST_ON:
ao_config.radio_setting = ao_radio_spi_request.setting;
ao_radio_test(1);
break;
case AO_RADIO_SPI_TEST_OFF:
ao_radio_test(0);
break;
}
ao_radio_slave_low();
}
}
static __xdata struct ao_task ao_radio_slave_spi_task;
void
ao_radio_slave_init(void)
{
ao_add_task(&ao_radio_slave_spi_task, ao_radio_slave_spi, "radio_spi");
ao_enable_output(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 0);
}
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