From 7fdfde9314736d20760682a0c7ab91cf11eefb6c Mon Sep 17 00:00:00 2001
From: Jared Boone <jboone@earfeast.com>
Date: Wed, 17 Oct 2012 11:48:35 -0700
Subject: [PATCH] Make use of i2c0_init() argument to control duty cycle, when
 APB1 clock shifts from IRC (~12MHz) to PLL1 (204MHz).

---
 firmware/common/hackrf_core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/firmware/common/hackrf_core.c b/firmware/common/hackrf_core.c
index fd3cd70b..4135f369 100644
--- a/firmware/common/hackrf_core.c
+++ b/firmware/common/hackrf_core.c
@@ -39,7 +39,10 @@ void delay(uint32_t duration)
 /* clock startup for Jellybean with Lemondrop attached */ 
 void cpu_clock_init(void)
 {
-	i2c0_init();
+	/* use IRC as clock source for APB1 (including I2C0) */
+	CGU_BASE_APB1_CLK = CGU_BASE_APB1_CLK_CLK_SEL(CGU_SRC_IRC);
+
+	i2c0_init(15);
 
 	si5351c_disable_all_outputs();
 	si5351c_disable_oeb_pin_control();
@@ -120,6 +123,8 @@ void cpu_clock_init(void)
 	si5351c_enable_clock_outputs();
 
 	//FIXME disable I2C
+	/* Kick I2C0 down to 400kHz when we switch over to APB1 clock = 204MHz */
+	i2c0_init(255);
 
 	/*
 	 * 12MHz clock is entering LPC XTAL1/OSC input now.  On