altos: Change CC1120 SPI speed to 4MHz.

Most of the chip can run at 8MHz, but extended register access is
limited to 6.1MHz. Instead of pushing things, just run the SPI bus at
4MHz.

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

diff --git a/src/drivers/ao_cc1120.c b/src/drivers/ao_cc1120.c
index 8068740f91782483e6f83329a4f439d2c778b5a5..53bb5a62f5621bedb4c94d48d76b660b5213ea46 100644 (file)
--- a/src/drivers/ao_cc1120.c
+++ b/src/drivers/ao_cc1120.c
@@ -38,7 +38,7 @@ extern const uint32_t ao_radio_cal;
 
 #define FOSC   32000000
 
-#define ao_radio_select()      ao_spi_get_mask(AO_CC1120_SPI_CS_PORT,(1 << AO_CC1120_SPI_CS_PIN),AO_CC1120_SPI_BUS,AO_SPI_SPEED_1MHz)
+#define ao_radio_select()      ao_spi_get_mask(AO_CC1120_SPI_CS_PORT,(1 << AO_CC1120_SPI_CS_PIN),AO_CC1120_SPI_BUS,AO_SPI_SPEED_4MHz)
 #define ao_radio_deselect()    ao_spi_put_mask(AO_CC1120_SPI_CS_PORT,(1 << AO_CC1120_SPI_CS_PIN),AO_CC1120_SPI_BUS)
 #define ao_radio_spi_send(d,l) ao_spi_send((d), (l), AO_CC1120_SPI_BUS)
 #define ao_radio_spi_send_fixed(d,l) ao_spi_send_fixed((d), (l), AO_CC1120_SPI_BUS)