FreeRTOS: Added FreeRTOS 7.0.1, including hook in libmaple/systick.c and example blinky.

1 files changed, 11 insertions, 0 deletions

diff --git a/libmaple/systick.c b/libmaple/systick.c
index 5a94d81..388f7aa 100644
--- a/libmaple/systick.c
+++ b/libmaple/systick.c
@@ -31,6 +31,7 @@
 #include "systick.h"
 
 volatile uint32 systick_uptime_millis;
+static void (*systick_user_callback)(void);
 
 /**
  * @brief Initialize and enable SysTick.
@@ -64,10 +65,20 @@ void systick_enable() {
                          SYSTICK_CSR_TICKINT_PEND);
 }
 
+/**
+ * Attach a callback called each ms.
+ */
+void systick_attach_callback(void (*callback)(void)) {
+    systick_user_callback = callback;
+}
+
 /*
  * SysTick ISR
  */
 
 void __exc_systick(void) {
+	if (systick_user_callback) {
+        systick_user_callback();
+    }
     systick_uptime_millis++;
 }