altos: Add SPI linked radio API

Forward the necessary radio functions over the SPI link

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 127 insertions, 0 deletions

diff --git a/src/drivers/ao_radio_slave.c b/src/drivers/ao_radio_slave.c
new file mode 100644
index 00000000..9dff511b
--- /dev/null
+++ b/src/drivers/ao_radio_slave.c
@@ -0,0 +1,127 @@
+/*
+ * 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; 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_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	ao_radio_spi_recv_request;
+static __xdata uint8_t	ao_radio_spi_recv_len;
+static __xdata uint16_t	ao_radio_spi_recv_timeout;
+
+static void
+ao_radio_slave_signal(void)
+{
+	ao_gpio_set(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 0);
+	ao_arch_nop();
+	ao_arch_nop();
+	ao_arch_nop();
+	ao_gpio_set(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 0);
+}
+
+static void
+ao_radio_slave_spi(void)
+{
+	for (;;) {
+		ao_spi_get_slave(AO_RADIO_SLAVE_BUS);
+		ao_spi_recv(&ao_radio_spi_request, (2 << 13) | sizeof (ao_radio_spi_request), AO_RADIO_SLAVE_BUS);
+		ao_spi_put_slave(AO_RADIO_SLAVE_BUS);
+		ao_led_for(AO_LED_RED, AO_MS_TO_TICKS(1000));
+		switch (ao_radio_spi_request.request) {
+		case AO_RADIO_SPI_RECV:
+		case AO_RADIO_SPI_CMAC_RECV:
+			ao_config.radio_setting = ao_radio_spi_request.setting;
+			ao_radio_spi_recv_request = ao_radio_spi_request.request;
+			ao_radio_spi_recv_len = ao_radio_spi_request.recv_len;
+			ao_radio_spi_recv_timeout = ao_radio_spi_request.timeout;
+			ao_wakeup(&ao_radio_spi_recv_len);
+			break;
+		case AO_RADIO_SPI_RECV_FETCH:
+			ao_spi_get_slave(AO_RADIO_SLAVE_BUS);
+			ao_spi_send(&ao_radio_spi_reply,
+				    ao_radio_spi_request.recv_len + AO_RADIO_SPI_REPLY_HEADER_LEN,
+				    AO_RADIO_SLAVE_BUS);
+			ao_spi_put_slave(AO_RADIO_SLAVE_BUS);
+			break;
+		case AO_RADIO_SPI_RECV_ABORT:
+			ao_radio_recv_abort();
+			break;
+		case AO_RADIO_SPI_SEND:
+			ao_config.radio_setting = ao_radio_spi_request.setting;
+			ao_radio_send(&ao_radio_spi_request.payload, ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
+			ao_radio_slave_signal();
+			break;
+
+		case AO_RADIO_SPI_CMAC_SEND:
+			ao_config.radio_setting = ao_radio_spi_request.setting;
+			ao_radio_cmac_send(&ao_radio_spi_request.payload, ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
+			ao_radio_slave_signal();
+			break;
+			
+		case AO_RADIO_SPI_CMAC_KEY:
+			ao_xmemcpy(&ao_config.aes_key, ao_radio_spi_request.payload, AO_AES_LEN);
+			ao_radio_slave_signal();
+			break;
+
+		case AO_RADIO_SPI_TEST_ON:
+			ao_radio_test(1);
+			ao_radio_slave_signal();
+			break;
+
+		case AO_RADIO_SPI_TEST_OFF:
+			ao_radio_test(0);
+			ao_radio_slave_signal();
+			break;
+		}
+	}
+}
+
+static void
+ao_radio_slave_recv(void)
+{
+	uint8_t	len;
+	for (;;) {
+		while (!ao_radio_spi_recv_len)
+			ao_sleep(&ao_radio_spi_recv_len);
+		len = ao_radio_spi_recv_len;
+		ao_radio_spi_recv_len = 0;
+		if (ao_radio_spi_recv_request == AO_RADIO_SPI_RECV) {
+			ao_radio_spi_reply.status = ao_radio_recv(&ao_radio_spi_reply.payload, len);
+			ao_radio_spi_reply.rssi = 0;
+		} else {
+			ao_radio_spi_reply.status = ao_radio_cmac_recv(&ao_radio_spi_reply.payload, len,
+								       ao_radio_spi_recv_timeout);
+			ao_radio_spi_reply.rssi = ao_radio_cmac_rssi;
+		}
+		ao_radio_slave_signal();
+	}
+}
+
+static __xdata struct ao_task ao_radio_slave_spi_task;
+static __xdata struct ao_task ao_radio_slave_recv_task;
+
+void
+ao_radio_slave_init(void)
+{
+	ao_add_task(&ao_radio_slave_spi_task, ao_radio_slave_spi, "radio_spi");
+	ao_add_task(&ao_radio_slave_recv_task, ao_radio_slave_recv, "radio_recv");
+	ao_enable_output(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 1);
+}