Diff: targets/TARGET_Realtek/TARGET_AMEBA/us_ticker.c

Revision:

167:e84263d55307

Child:

173:e131a1973e81

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Realtek/TARGET_AMEBA/us_ticker.c	Wed Jun 21 17:46:44 2017 +0100
@@ -0,0 +1,108 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2013-2016 Realtek Semiconductor Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "objects.h"
+#include <stddef.h>
+#include "us_ticker_api.h"
+#include "PeripheralNames.h"
+
+#define TICK_READ_FROM_CPU  0   // 1: read tick from CPU, 0: read tick from G-Timer
+#define SYS_TIM_ID      1   // the G-Timer ID for System
+#define APP_TIM_ID      6   // the G-Timer ID for Application
+
+static int us_ticker_inited = 0;
+static TIMER_ADAPTER TimerAdapter;
+
+extern HAL_TIMER_OP HalTimerOp;
+extern HAL_TIMER_OP_EXT HalTimerOpExt;
+
+VOID _us_ticker_irq_handler(IN  VOID *Data)
+{
+    us_ticker_irq_handler();
+}
+
+void us_ticker_init(void) 
+{
+    
+    if (us_ticker_inited) return;
+    us_ticker_inited = 1;
+    
+
+    // Initial a G-Timer
+    TimerAdapter.IrqDis = 0;    // Enable Irq @ initial
+    TimerAdapter.IrqHandle.IrqFun = (IRQ_FUN) _us_ticker_irq_handler;
+    TimerAdapter.IrqHandle.IrqNum = TIMER2_7_IRQ;
+    TimerAdapter.IrqHandle.Priority = 10;
+    TimerAdapter.IrqHandle.Data = (u32)NULL;
+    TimerAdapter.TimerId = APP_TIM_ID;
+    TimerAdapter.TimerIrqPriority = 0;
+    TimerAdapter.TimerLoadValueUs = 0xFFFFFFFF;
+    TimerAdapter.TimerMode = USER_DEFINED;
+
+    HalTimerOp.HalTimerInit((VOID*) &TimerAdapter);
+
+    DBG_TIMER_INFO("%s: Timer_Id=%d\n", __FUNCTION__, APP_TIM_ID);
+}
+
+uint32_t us_ticker_read() 
+{
+    uint32_t tick_cnt;
+    uint32_t ticks_125ms;
+    uint32_t ticks_remain;
+    uint64_t us_tick;
+
+    tick_cnt = HalTimerOp.HalTimerReadCount(SYS_TIM_ID);
+    tick_cnt = 0xffffffff - tick_cnt;   // it's a down counter
+    ticks_125ms = tick_cnt/(GTIMER_CLK_HZ/8);  //use 125ms as a intermediate unit; 
+    ticks_remain = tick_cnt - (ticks_125ms*(GTIMER_CLK_HZ/8));  //calculate the remainder
+    us_tick = ticks_125ms * 125000;  //change unit to us, 125ms is 125000 us
+    us_tick += (ticks_remain * 1000000)/GTIMER_CLK_HZ;  //also use us as unit
+
+    return ((uint32_t)us_tick);  //return ticker value in micro-seconds (us)
+}
+
+void us_ticker_set_interrupt(timestamp_t timestamp) 
+{
+    uint32_t cur_time_us;
+    uint32_t time_def;
+
+
+    cur_time_us = us_ticker_read();
+    if ((uint32_t)timestamp >= cur_time_us) {
+        time_def = (uint32_t)timestamp - cur_time_us;
+    } else {
+        time_def = 0xffffffff - cur_time_us + (uint32_t)timestamp;
+    }    
+
+    if (time_def < TIMER_TICK_US) {
+        time_def = TIMER_TICK_US;       // at least 1 tick
+    }
+    HalTimerOp.HalTimerDis((u32)TimerAdapter.TimerId);
+    HalTimerOpExt.HalTimerReLoad((u32)TimerAdapter.TimerId, time_def);
+    HalTimerOpExt.HalTimerIrqEn((u32)TimerAdapter.TimerId);
+    HalTimerOp.HalTimerEn((u32)TimerAdapter.TimerId);
+
+}
+
+void us_ticker_disable_interrupt(void) 
+{
+    HalTimerOp.HalTimerDis((u32)TimerAdapter.TimerId);
+}
+
+void us_ticker_clear_interrupt(void) 
+{
+    HalTimerOp.HalTimerIrqClear((u32)TimerAdapter.TimerId);
+}