Merge pull request #1162 from martinling/ant-bias-glitch

Fix antenna bias pulse glitch at startup.

firmware/common/hackrf_core.c

@@ -931,6 +931,9 @@ void disable_rf_power(void)
 void enable_rf_power(void)
 {
 	gpio_set(&gpio_vaa_enable);
+
+	/* Let the voltage stabilize */
+	delay(1000000);
 }
 
 void disable_rf_power(void)

firmware/common/rf_path.c

@@ -339,7 +339,10 @@ void rf_path_init(rf_path_t* const rf_path)
 	max2837_setup(&max2837);
 	max2837_start(&max2837);
 
+	// On HackRF One, the mixer is now set up earlier in boot.
+#ifndef HACKRF_ONE
 	mixer_setup(&mixer);
+#endif
 	switchctrl_set(rf_path, switchctrl);
 }
 

firmware/common/rffc5071.c

@@ -62,7 +62,7 @@ static const uint16_t rffc5071_regs_default[RFFC5071_NUM_REGS] = {
 	0x0000, /* 13 */
 	0x0000, /* 14 */
 	0x0000, /* 15 */
-	0x0000, /* 16 */
+	0x0206, /* 16 */
 	0x4900, /* 17 */
 	0x0281, /* 18 */
 	0xf00f, /* 19 */

firmware/hackrf_usb/hackrf_usb.c

@@ -229,11 +229,13 @@ int main(void)
 	detect_hardware_platform();
 	pin_setup();
 	enable_1v8_power();
+#ifdef HACKRF_ONE
+	// Set up mixer before enabling RF power, because its
+	// GPO is used to control the antenna bias tee.
+	mixer_setup(&mixer);
+#endif
 #if (defined HACKRF_ONE || defined RAD1O)
 	enable_rf_power();
-
-	/* Let the voltage stabilize */
-	delay(1000000);
 #endif
 	cpu_clock_init();