basic implemtation general purpose clock and tinyprintf

[cortex-from-scratch] / rtc.c

diff --git a/rtc.c b/rtc.c
index 9ffffc7..4877d92 100644 (file)
--- a/rtc.c
+++ b/rtc.c
@@ -18,19 +18,22 @@
 #include <lib/regfunc.h>
 #include <lib/stdio.h>
 
+#include <drivers/led.h>
+
 
 static void periodic_intr() {
 
        while(!rchkbit(RTC_CRL, 5)); // Check last write is terminated
-       rsetbit(RTC_CRL, 4);
+       rsetbit(RTC_CRL, 4); // start configure
        
        rsetbit(RTC_CRH, 0); // enable periodic (second) interrupt
        
        while(!rchkbit(RTC_CRL, 5)); 
 
        rwrite(RTC_PRLL, 0x7FFF); // 1 second
-       rclrbit(RTC_CRL, 4);
+       rclrbit(RTC_CRL, 4); // stop configure
        while(!rchkbit(RTC_CRL, 5)); // Check last write is terminated
+       rsetbit(NVIC_ISER0, 3); // enable in register vector
 }
 
 static void calibrate_rtc() {
@@ -49,6 +52,10 @@ static void calibrate_rtc() {
 void * rtc_handler() {
 
        //cputs("TICKING IN REAL TIME\n");
+       //uint32_t curr = *RTC_CNTL;
+       int even = *RTC_CNTL % 2;
+       (!even) ? led_off() : led_on();
+
        rclrbit(RTC_CRL, 0);
 }