From: Keith Packard <keithp@keithp.com>
Date: Thu, 2 Feb 2023 01:59:28 +0000 (-0800)
Subject: altos/drivers: Use spi duplex to fetch register values
X-Git-Tag: 1.9.14~1^2~3
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=fe99a50a7c1b4834193bbb73fbfd1b0e49b7ff45

altos/drivers: Use spi duplex to fetch register values

We read register values during regular operation, so let's improve
performance a bit by making this faster.

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

diff --git a/src/drivers/ao_cc1200.c b/src/drivers/ao_cc1200.c
index 799f808f..b295d054 100644
--- a/src/drivers/ao_cc1200.c
+++ b/src/drivers/ao_cc1200.c
@@ -65,7 +65,7 @@ extern const uint32_t	ao_radio_cal;
 static uint8_t
 ao_radio_reg_read(uint16_t addr)
 {
-	uint8_t	data[2];
+	uint8_t	data[3];
 	uint8_t	d;
 
 #if CC1200_TRACE
@@ -84,13 +84,12 @@ ao_radio_reg_read(uint16_t addr)
 		d = 1;
 	}
 	ao_radio_select();
-	ao_radio_spi_send(data, d);
-	ao_radio_spi_recv(data, 1);
+	ao_radio_duplex(data, data, d + 1);
 	ao_radio_deselect();
 #if CC1200_TRACE
-	printf (" %02x\n", data[0]);
+	printf (" %02x\n", data[d]);
 #endif
-	return data[0];
+	return data[d];
 }
 
 static void