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/**************************************************************************//**
* @file os_tick_ptim.c
* @brief CMSIS OS Tick implementation for Private Timer
* @version V1.0.2
* @date 02. March 2018
******************************************************************************/
/*
* Copyright (c) 2017-2018 Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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
*
* 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 "RTE_Components.h"
#include CMSIS_device_header
#if defined(PTIM)
#include "os_tick.h"
#include "irq_ctrl.h"
#ifndef PTIM_IRQ_PRIORITY
#define PTIM_IRQ_PRIORITY 0xFFU
#endif
static uint8_t PTIM_PendIRQ; // Timer interrupt pending flag
// Setup OS Tick.
int32_t OS_Tick_Setup (uint32_t freq, IRQHandler_t handler) {
uint32_t load;
uint32_t prio;
uint32_t bits;
if (freq == 0U) {
return (-1);
}
PTIM_PendIRQ = 0U;
// Private Timer runs with the system frequency
load = (SystemCoreClock / freq) - 1U;
// Disable Private Timer and set load value
PTIM_SetControl (0U);
PTIM_SetLoadValue (load);
// Disable corresponding IRQ
IRQ_Disable (PrivTimer_IRQn);
IRQ_ClearPending(PrivTimer_IRQn);
// Determine number of implemented priority bits
IRQ_SetPriority (PrivTimer_IRQn, 0xFFU);
prio = IRQ_GetPriority (PrivTimer_IRQn);
// At least bits [7:4] must be implemented
if ((prio & 0xF0U) == 0U) {
return (-1);
}
for (bits = 0; bits < 4; bits++) {
if ((prio & 0x01) != 0) {
break;
}
prio >>= 1;
}
// Adjust configured priority to the number of implemented priority bits
prio = (PTIM_IRQ_PRIORITY << bits) & 0xFFUL;
// Set Private Timer interrupt priority
IRQ_SetPriority(PrivTimer_IRQn, prio-1U);
// Set edge-triggered IRQ
IRQ_SetMode(PrivTimer_IRQn, IRQ_MODE_TRIG_EDGE);
// Register tick interrupt handler function
IRQ_SetHandler(PrivTimer_IRQn, handler);
// Enable corresponding interrupt
IRQ_Enable (PrivTimer_IRQn);
// Set bits: IRQ enable and Auto reload
PTIM_SetControl (0x06U);
return (0);
}
/// Enable OS Tick.
void OS_Tick_Enable (void) {
uint32_t ctrl;
// Set pending interrupt if flag set
if (PTIM_PendIRQ != 0U) {
PTIM_PendIRQ = 0U;
IRQ_SetPending (PrivTimer_IRQn);
}
// Start the Private Timer
ctrl = PTIM_GetControl();
// Set bit: Timer enable
ctrl |= 1U;
PTIM_SetControl (ctrl);
}
/// Disable OS Tick.
void OS_Tick_Disable (void) {
uint32_t ctrl;
// Stop the Private Timer
ctrl = PTIM_GetControl();
// Clear bit: Timer enable
ctrl &= ~1U;
PTIM_SetControl (ctrl);
// Remember pending interrupt flag
if (IRQ_GetPending(PrivTimer_IRQn) != 0) {
IRQ_ClearPending (PrivTimer_IRQn);
PTIM_PendIRQ = 1U;
}
}
// Acknowledge OS Tick IRQ.
void OS_Tick_AcknowledgeIRQ (void) {
PTIM_ClearEventFlag();
}
// Get OS Tick IRQ number.
int32_t OS_Tick_GetIRQn (void) {
return (PrivTimer_IRQn);
}
// Get OS Tick clock.
uint32_t OS_Tick_GetClock (void) {
return (SystemCoreClock);
}
// Get OS Tick interval.
uint32_t OS_Tick_GetInterval (void) {
return (PTIM_GetLoadValue() + 1U);
}
// Get OS Tick count value.
uint32_t OS_Tick_GetCount (void) {
uint32_t load = PTIM_GetLoadValue();
return (load - PTIM_GetCurrentValue());
}
// Get OS Tick overflow status.
uint32_t OS_Tick_GetOverflow (void) {
return (PTIM->ISR & 1);
}
#endif // PTIM
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