altos/ms5607: Use duplex for fetching data

Much more efficient than send/recv

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

diff --git a/src/drivers/ao_ms5607.c b/src/drivers/ao_ms5607.c
index 46da4e837fa1e1afa3a5cbdd688d95e60a358b02..1e4cd1595e74ea959c93d77bfa561d9df7cadd6a 100644 (file)
--- a/src/drivers/ao_ms5607.c
+++ b/src/drivers/ao_ms5607.c
@@ -154,8 +154,7 @@ ao_ms5607_isr(void)
 
 static uint32_t
 ao_ms5607_get_sample(uint8_t cmd) {
-       uint8_t reply[3];
-       uint8_t read;
+       uint8_t reply[4];
 
        ao_ms5607_done = 0;
 
@@ -179,12 +178,12 @@ ao_ms5607_get_sample(uint8_t cmd) {
 #endif
 
        ao_ms5607_start();
-       read = AO_MS5607_ADC_READ;
-       ao_spi_send(&read, 1, AO_MS5607_SPI_INDEX);
-       ao_spi_recv(&reply, 3, AO_MS5607_SPI_INDEX);
+       memset(reply, 0, sizeof(reply));
+       reply[0] = AO_MS5607_ADC_READ;
+       ao_spi_duplex(&reply, &reply, 6, AO_MS5607_SPI_INDEX);
        ao_ms5607_stop();
 
-       return ((uint32_t) reply[0] << 16) | ((uint32_t) reply[1] << 8) | (uint32_t) reply[2];
+       return ((uint32_t) reply[1] << 16) | ((uint32_t) reply[2] << 8) | (uint32_t) reply[3];
 }
 
 #ifndef AO_MS5607_BARO_OVERSAMPLE