From 5d6667141e7b5d567d03ff3004f1519834e3e0f5 Mon Sep 17 00:00:00 2001
From: Michael Ossmann <mike@ossmann.com>
Date: Sun, 28 Jan 2018 16:24:48 -0700
Subject: [PATCH] short pulses when enabling VAA to avoid a big voltage glitch

---
 firmware/common/hackrf_core.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/firmware/common/hackrf_core.c b/firmware/common/hackrf_core.c
index cb84daac..94a1b02b 100644
--- a/firmware/common/hackrf_core.c
+++ b/firmware/common/hackrf_core.c
@@ -952,6 +952,13 @@ void disable_1v8_power(void) {
 
 #ifdef HACKRF_ONE
 void enable_rf_power(void) {
+	uint32_t i;
+
+	/* many short pulses to avoid one big voltage glitch */
+	for (i = 0; i < 1000; i++) {
+		gpio_clear(&gpio_vaa_disable);
+		gpio_set(&gpio_vaa_disable);
+	}
 	gpio_clear(&gpio_vaa_disable);
 }