altos: Add bit-bang i2c driver

[fw/altos] / src / kernel / ao_log_gps.c

diff --git a/src/kernel/ao_log_gps.c b/src/kernel/ao_log_gps.c
index bf326c1a7fb972b7e0d601adfaab767b806586a0..2b45f35e06ba11b07a35f3d4c84f791e6336606a 100644 (file)
--- a/src/kernel/ao_log_gps.c
+++ b/src/kernel/ao_log_gps.c
@@ -81,18 +81,31 @@ ao_log_gps_tracking(uint16_t tick, struct ao_telemetry_satellite *gps_tracking_d
        ao_log_write(&ao_log_data);
 }
 
+static uint8_t
+ao_log_check_empty(void)
+{
+       uint8_t *b = (void *) &ao_log_data;
+       unsigned i;
+
+       for (i = 0; i < sizeof (ao_log_type); i++)
+               if (*b++ != AO_STORAGE_ERASED_BYTE)
+                       return 0;
+       return 1;
+}
+
 int8_t
 ao_log_check(uint32_t pos)
 {
-       if (ao_storage_is_erased(pos & ~(ao_storage_block - 1)))
-               return 0;
-
        if (!ao_storage_read(pos,
                             &ao_log_data,
                             sizeof (struct ao_log_gps)))
                return AO_LOG_INVALID;
 
+       if (ao_log_check_empty())
+               return AO_LOG_EMPTY;
+
        if (!ao_log_check_data())
                return AO_LOG_INVALID;
+
        return AO_LOG_VALID;
 }