From 5978c99c313c894fb297e44c3bffecf6adfe5577 Mon Sep 17 00:00:00 2001
From: Jared Boone <jboone@earfeast.com>
Date: Thu, 20 Aug 2015 17:51:07 -0700
Subject: [PATCH] Add API to stop HAL SysTick counter.

---
 .../chibios-portapack/os/hal/platforms/LPC43xx_M0/hal_lld.c   | 4 ++++
 .../chibios-portapack/os/hal/platforms/LPC43xx_M0/hal_lld.h   | 1 +
 .../chibios-portapack/os/hal/platforms/LPC43xx_M4/hal_lld.c   | 4 ++++
 .../chibios-portapack/os/hal/platforms/LPC43xx_M4/hal_lld.h   | 1 +
 4 files changed, 10 insertions(+)

diff --git a/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M0/hal_lld.c b/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M0/hal_lld.c
index 3d3bc11f..dfb28c1e 100755
--- a/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M0/hal_lld.c
+++ b/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M0/hal_lld.c
@@ -89,6 +89,10 @@ void systick_adjust_period(const uint32_t counts_per_tick) {
   ritimer_start();
 }
 
+void systick_stop() {
+  ritimer_stop();
+}
+
 /**
  * @brief   Low level HAL driver initialization.
  *
diff --git a/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M0/hal_lld.h b/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M0/hal_lld.h
index d2ced74b..5a3ee2a0 100755
--- a/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M0/hal_lld.h
+++ b/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M0/hal_lld.h
@@ -145,6 +145,7 @@ typedef uint32_t halrtcnt_t;
 extern "C" {
 #endif
   void hal_lld_init(void);
+  void systick_stop(void);
   void systick_adjust_period(const uint32_t counts_per_tick);
   halclock_t halLPCGetSystemClock(void);
   void halLPCSetSystemClock(const halclock_t new_frequency);
diff --git a/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M4/hal_lld.c b/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M4/hal_lld.c
index b610f250..97c6f8ba 100755
--- a/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M4/hal_lld.c
+++ b/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M4/hal_lld.c
@@ -63,6 +63,10 @@ void halLPCSetSystemClock(const halclock_t new_frequency) {
   hal_clock_f = new_frequency;
 }
 
+void systick_stop() {
+  SysTick->CTRL &= ~(SysTick_CTRL_ENABLE_Msk | SysTick_CTRL_TICKINT_Msk);
+}
+
 void systick_adjust_period(const uint32_t counts_per_tick) {
   SysTick->LOAD = counts_per_tick;
 }
diff --git a/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M4/hal_lld.h b/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M4/hal_lld.h
index 643324d5..d1e48abd 100755
--- a/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M4/hal_lld.h
+++ b/firmware/chibios-portapack/os/hal/platforms/LPC43xx_M4/hal_lld.h
@@ -164,6 +164,7 @@ typedef uint32_t halrtcnt_t;
 extern "C" {
 #endif
   void hal_lld_init(void);
+  void systick_stop(void);
   void systick_adjust_period(const uint32_t counts_per_tick);
   halclock_t halLPCGetSystemClock(void);
   void halLPCSetSystemClock(const halclock_t new_frequency);