altos: Wait for companion to see CS before attempting communcation

[fw/altos] / src / drivers / ao_companion.c

diff --git a/src/drivers/ao_companion.c b/src/drivers/ao_companion.c
index 6e0bd2ec15691a95f89bfbfeb59b08c517657def..2ed407f1d9b216ea4fa6ed34e9eaa82ead4d3cbe 100644 (file)
--- a/src/drivers/ao_companion.c
+++ b/src/drivers/ao_companion.c
@@ -24,11 +24,14 @@
 #endif
 
 #define COMPANION_SELECT()     do {                    \
+               uint8_t pause;                          \
                ao_spi_get_bit(AO_COMPANION_CS_PORT,    \
                               AO_COMPANION_CS_PIN,     \
                               AO_COMPANION_CS,         \
                               AO_COMPANION_SPI_BUS,    \
                               AO_SPI_SPEED_200kHz);    \
+               for (pause = 0; pause < 100; pause++)   \
+                       ao_arch_nop();                  \
        } while (0)
 
 #define COMPANION_DESELECT()   do {                    \
@@ -68,7 +71,7 @@ ao_companion_get_setup(void)
        ao_spi_recv(&ao_companion_setup, sizeof (ao_companion_setup), AO_COMPANION_SPI_BUS);
        COMPANION_DESELECT();
        return (ao_companion_setup.board_id ==
-               ~ao_companion_setup.board_id_inverse);
+               (uint16_t) ~ao_companion_setup.board_id_inverse);
 }
 
 static void
@@ -116,6 +119,8 @@ ao_companion_status(void) __reentrant
 {
        uint8_t i;
        printf("Companion running: %d\n", ao_companion_running);
+       if (!ao_companion_running)
+               return;
        printf("device: %d\n", ao_companion_setup.board_id);
        printf("update period: %d\n", ao_companion_setup.update_period);
        printf("channels: %d\n", ao_companion_setup.channels);