US Timer patch ARMmbed#1

Signed-off-by: PARKJIHOON <[email protected]>

Author: jh6186

targets/TARGET_Samsung/TARGET_SIDK_S5JS100/us_ticker.c

@@ -26,10 +26,13 @@
 #include "PeripheralNames.h"
 
 #define TIMER_TARGET_COUNT_DEFAULT    0xFFFFFFFF
+#define TIMER0_UNIT                   (26*1000*1000) //1s
 
 volatile uint32_t us_ticker_initialized = 0;
 volatile uint32_t us_user_intset;
 volatile uint32_t g_us_last_return = 0;
+uint64_t g_tick_sec = 0;
+uint32_t g_timer0_pre_cnt;
 
 void us_ticker_enable_interrupt(void);
 void us_ticker_disable_interrupt(void);
@@ -46,9 +49,9 @@ const ticker_info_t *us_ticker_get_info()
 static void enable_timer0(void)
 {
     putreg32(1, S5JS100_TIMER0_BASE + S5JS100_TIMER_UP_DOWN_SEL); // Set Up count
-    putreg32(0x0, S5JS100_TIMER0_BASE + S5JS100_TIMER_LOAD_VALUE);
+    putreg32(g_timer0_pre_cnt, S5JS100_TIMER0_BASE + S5JS100_TIMER_LOAD_VALUE);
     putreg32(0x1, S5JS100_TIMER0_BASE + S5JS100_TIMER_CDC_ENABLE);
-    putreg32(0, S5JS100_TIMER0_BASE + S5JS100_TIMER_CDC_COUNT_VALUE);
+    putreg32(g_timer0_pre_cnt, S5JS100_TIMER0_BASE + S5JS100_TIMER_CDC_COUNT_VALUE);
     putreg32(TIMER_TARGET_COUNT_DEFAULT, S5JS100_TIMER0_BASE + S5JS100_TIMER_INT_SEL);
     putreg32(0, S5JS100_TIMER0_BASE + S5JS100_TIMER_INT_ENABLE);
     putreg32(3, S5JS100_TIMER0_BASE + S5JS100_TIMER_CONTROL);
@@ -98,6 +101,7 @@ void us_ticker_init(void)
 
     if (!us_ticker_initialized) {
         us_ticker_initialized = 1;
+        g_timer0_pre_cnt = 0;
         /* Enable timer0 to timer */
         enable_timer0();
         /* Enable timer1 to compare and Disable timer1 interrupt */
@@ -114,11 +118,21 @@ void us_ticker_init(void)
 
 uint32_t us_ticker_read()
 {
+    uint32_t cnt;
     /* from timer0 read count value */
     if (!us_ticker_initialized) {
         us_ticker_init();
     }
-    volatile uint32_t current_count = getreg32(S5JS100_TIMER0_BASE + S5JS100_TIMER_CDC_COUNT_VALUE) / 26;
+    volatile uint32_t current_count = getreg32(S5JS100_TIMER0_BASE + S5JS100_TIMER_CDC_COUNT_VALUE);
+    cnt = current_count/TIMER0_UNIT;
+    if (cnt) {
+        g_tick_sec = g_tick_sec +cnt;
+        g_timer0_pre_cnt = current_count%TIMER0_UNIT;
+        current_count = current_count-(cnt*TIMER0_UNIT);
+        disable_timer0();
+        enable_timer0();
+    }
+    current_count = (current_count/26)+ (g_tick_sec*1000*1000);
     g_us_last_return = current_count;
     return current_count;
 }
@@ -128,11 +142,10 @@ void us_ticker_set_interrupt(timestamp_t timestamp)
     if (timestamp < 0x70000000 && timestamp != 0) {
         uint32_t temp = g_us_last_return;
         us_user_intset = timestamp - g_us_last_return;
-        /* keep to check
         if (us_user_intset < 0) {
             us_ticker_irq_handler();
             return;
-        }*/
+        }
         us_user_intset = us_user_intset * 26;
         uint32_t past_tick = us_ticker_read() - temp;
         putreg32(0, S5JS100_TIMER1_BASE + S5JS100_TIMER_LOAD_CON_VALUE);