Diff: mbed-dev/targets/TARGET_ARM_SSG/TARGET_BEETLE/device/apb_timer.c

Revision:

18:6a4db94011d3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-dev/targets/TARGET_ARM_SSG/TARGET_BEETLE/device/apb_timer.c	Sun May 14 23:18:57 2017 +0000
@@ -0,0 +1,262 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2016 ARM Limited
+ *
+ * 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 "cmsis.h"
+#include "apb_timer.h"
+
+/* Timer Private Data */
+typedef struct {
+    /* Timer Definition */
+    CMSDK_TIMER_TypeDef *timerN;
+    /* Timer IRQn */
+    uint32_t timerIRQn;
+    /* Timer Reload Value */
+    uint32_t timerReload;
+    /* Timer state */
+    uint32_t state;
+} apb_timer_t;
+
+/* Timer state definitions */
+#define TIMER_INITIALIZED   (1)
+#define TIMER_ENABLED       (1 << 1)
+
+/*
+ * This Timer is written for MBED OS and keeps count
+ * of the ticks. All the elaboration logic is demanded
+ * to the upper layers.
+ */
+#define TIMER_MAX_VALUE     0xFFFFFFFF
+#define TIMER_TICKS_US      (SystemCoreClock/1000000)
+
+/* Timers Array */
+static apb_timer_t Timers[NUM_TIMERS];
+
+void Timer_Index_Init(uint32_t timer, uint32_t reload,
+    CMSDK_TIMER_TypeDef *TimerN, uint32_t IRQn)
+{
+    Timers[timer].timerN = TimerN;
+    Timers[timer].timerIRQn = IRQn;
+    Timers[timer].timerReload = reload;
+    Timers[timer].state = TIMER_INITIALIZED;
+}
+
+/*
+ * Timer_Initialize(): Initializes an hardware timer
+ * timer: timer to be Initialized
+ * time_us: timer reload value in us - 0 to reload to timer max value
+ *          time_us = tick_value / TIMER_TICKS_US
+ */
+#define TIMER_INIT(index, reload) Timer_Index_Init(index, reload, CMSDK_TIMER##index, TIMER##index##_IRQn)
+void Timer_Initialize(uint32_t timer, uint32_t time_us)
+{
+    uint32_t reload = 0;
+
+    if (timer < NUM_TIMERS)
+    {
+        if (time_us == 0)
+            reload = TIMER_MAX_VALUE;
+        else
+            reload = (time_us) * TIMER_TICKS_US;
+
+        switch(timer) {
+            case 0: TIMER_INIT(0, reload);
+                    break;
+            case 1: TIMER_INIT(1, reload);
+                    break;
+            default: break;
+        }
+    }
+}
+
+/*
+ * Timer_Enable(): Enables a hardware timer
+ * timer: timer to be enabled
+ */
+void Timer_Enable(uint32_t timer)
+{
+    /* The timer has to be contained in a valid range */
+    if (timer < NUM_TIMERS) {
+        /* Timer has to be already initialized */
+        if (Timers[timer].state == TIMER_INITIALIZED) {
+            /* Disable Timer */
+            (Timers[timer].timerN)->CTRL = 0x0;
+            /* Reload Value */
+            (Timers[timer].timerN)->RELOAD = Timers[timer].timerReload;
+            /* Enable Interrupt */
+            (Timers[timer].timerN)->CTRL = CMSDK_TIMER_CTRL_IRQEN_Msk;
+            /* Enable Counter */
+            (Timers[timer].timerN)->CTRL |= CMSDK_TIMER_CTRL_EN_Msk;
+            /* Change timer state */
+            Timers[timer].state |= TIMER_ENABLED;
+        }
+    }
+}
+
+/*
+ * Timer_Disable(): Disables a hardware timer
+ * timer: timer to be disabled
+ */
+void Timer_Disable(uint32_t timer)
+{
+    /* The timer has to be contained in a valid range */
+    if (timer < NUM_TIMERS) {
+        /* Timer has to be already initialized and enabled */
+        if (Timers[timer].state == (TIMER_INITIALIZED | TIMER_ENABLED)) {
+            /* Disable Timer */
+            (Timers[timer].timerN)->CTRL = 0x0;
+            /* Change timer state */
+            Timers[timer].state = TIMER_INITIALIZED;
+        }
+    }
+}
+
+/*
+ * Timer_isEnabled(): verifies if a timer is enabled
+ * timer: timer to be verified
+ * @return: 0 disabled - 1 enabled
+ */
+uint32_t Timer_isEnabled(uint32_t timer)
+{
+    /* The timer has to be contained in a valid range */
+    if (timer < NUM_TIMERS) {
+        /* Timer has to be already initialized and enabled */
+        if (Timers[timer].state == (TIMER_INITIALIZED | TIMER_ENABLED))
+            return 1;
+    } else {
+        return 0;
+    }
+    return 0;
+}
+
+/*
+ * Timer_Read(): provides timer VALUE
+ * timer: timer to be read
+ * @return: timer VALUE us
+ */
+uint32_t Timer_Read(uint32_t timer)
+{
+    uint32_t return_value = 0;
+    /* Verify if the Timer is enabled */
+    if (Timer_isEnabled(timer) == 1) {
+        return_value = (Timers[timer].timerReload
+                    - (Timers[timer].timerN)->VALUE)
+                    / TIMER_TICKS_US;
+    }
+
+    return return_value;
+}
+
+/*
+ * Timer_SetInterrupt(): sets timer Interrupt
+ * timer: timer on which interrupt is set
+ * time_us: reloading time in us
+ */
+void Timer_SetInterrupt(uint32_t timer, uint32_t time_us)
+{
+    uint32_t load_time_us = 0;
+    /* Verify if the Timer is enabled */
+    if (Timer_isEnabled(timer) == 1) {
+        /* Disable Timer */
+        Timer_Disable(timer);
+        /* Enable Interrupt */
+        (Timers[timer].timerN)->CTRL = CMSDK_TIMER_CTRL_IRQEN_Msk;
+
+        /* Check time us condition */
+        if(time_us == TIMER_DEFAULT_RELOAD)
+            load_time_us = TIMER_MAX_VALUE;
+        else
+            load_time_us = time_us * TIMER_TICKS_US;
+
+        /* Initialize Timer Value */
+        Timers[timer].timerReload = load_time_us;
+        (Timers[timer].timerN)->RELOAD = Timers[timer].timerReload;
+        (Timers[timer].timerN)->VALUE = Timers[timer].timerReload;
+        /* Enable Counter */
+        (Timers[timer].timerN)->CTRL |= CMSDK_TIMER_CTRL_EN_Msk;
+        /* Change timer state */
+        Timers[timer].state |= TIMER_ENABLED;
+    }
+}
+
+/*
+ * Timer_DisableInterrupt(): disables timer interrupt
+ * timer: timer on which interrupt is disabled
+ */
+void Timer_DisableInterrupt(uint32_t timer)
+{
+    /* Verify if the Timer is enabled */
+    if (Timer_isEnabled(timer) == 1) {
+        /* Disable Interrupt */
+        (Timers[timer].timerN)->CTRL &= CMSDK_TIMER_CTRL_EN_Msk;
+    }
+}
+
+/*
+ * Timer_ClearInterrupt(): clear timer interrupt
+ * timer: timer on which interrupt needs to be cleared
+ */
+void Timer_ClearInterrupt(uint32_t timer)
+{
+    /* Verify if the Timer is enabled */
+    if (Timer_isEnabled(timer) == 1) {
+        /* Clear Interrupt */
+        (Timers[timer].timerN)->INTCLEAR = CMSDK_TIMER_INTCLEAR_Msk;
+    }
+}
+
+/*
+ * Timer_GetIRQn(): returns IRQn of a Timer
+ * timer: timer on which IRQn is defined - 0 if it is not defined
+ */
+uint32_t Timer_GetIRQn(uint32_t timer)
+{
+    /* Verify if the Timer is enabled */
+    if (Timer_isEnabled(timer) == 1) {
+        return Timers[timer].timerIRQn;
+    }
+    return 0;
+}
+
+/*
+ * Timer_GetTicksUS(): returns the number of Ticks per us
+ * timer: timer associated with the Ticks per us
+ * @return: Ticks per us - 0 if the timer is disables
+ */
+uint32_t Timer_GetTicksUS(uint32_t timer)
+{
+    /* Verify if the Timer is enabled */
+    if (Timer_isEnabled(timer) == 1) {
+        return TIMER_TICKS_US;
+    }
+    return 0;
+}
+
+/*
+ * Timer_GetReloadValue(): returns the load value of the selected
+ * timer.
+ * timer: timer associated with the Ticks per us
+ * @return: reload value of the selected singletimer
+ */
+uint32_t Timer_GetReloadValue(uint32_t timer)
+{
+    /* Verify if the Timer is enabled */
+    if (Timer_isEnabled(timer) == 1) {
+        if (timer == TIMER1)
+            return Timers[timer].timerReload / TIMER_TICKS_US;
+        else
+            return Timers[timer].timerReload / TIMER_TICKS_US;
+    }
+    return 0;
+}