more work on ADS131A0X driver, still not working right

diff --git a/src/drivers/ao_ads131a0x.c b/src/drivers/ao_ads131a0x.c
index 14c030143e42662676f509c430f73827ff80cd12..23332eeefb81e8c692f29e282c5d6bc8aadaa41a 100644 (file)
--- a/src/drivers/ao_ads131a0x.c
+++ b/src/drivers/ao_ads131a0x.c
@@ -129,12 +129,27 @@ ao_ads131a0x_setup(void)
 
        ao_delay(1);
 
-       /* send unlock command?  why, if we've not locked it? */
-
+       /* confirm we're talking to the chip we're expecting */
        uint8_t devid = ao_ads131a0x_reg_read(AO_ADS131A0X_ID_MSB);
        if (devid != AO_ADS131A0X_ID_ADS131A04)
                ao_panic(AO_PANIC_SELF_TEST_ADS);
 
+       /* send unlock command so we can configure the chip */
+
+       d[0] = AO_ADS131A0X_UNLOCK >> 8;
+       d[1] = AO_ADS131A0X_UNLOCK & 0xff;
+       d[2] = 0;                       
+       ao_ads131a0x_start();
+       ao_spi_send(d, 3, AO_ADS131A0X_SPI_BUS);
+       ao_ads131a0x_stop();
+
+       /* data isn't actually returned until the next frame */
+       d[0] = AO_ADS131A0X_NULL >> 8;
+       d[1] = AO_ADS131A0X_NULL & 0xff;
+       ao_ads131a0x_start();
+       ao_spi_duplex(d, d, 3, AO_ADS131A0X_SPI_BUS);
+       ao_ads131a0x_stop();
+
        ao_exti_setup(AO_ADS131A0X_DRDY_PORT, AO_ADS131A0X_DRDY_PIN,
                AO_EXTI_MODE_FALLING|AO_EXTI_PRIORITY_HIGH,
                ao_ads131a0x_isr);
@@ -257,7 +272,7 @@ ao_ads131a0x_dump(void)
 }
 
 const struct ao_cmds ao_ads131a0x_cmds[] = {
-       { ao_ads131a0x_dump,    "I\0Display ADS131A0X data" },
+       { ao_ads131a0x_dump,    "A\0Display ADS131A0X data" },
        { 0, NULL },
 };