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| Rev | Author | Line No. | Line |
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| 2 | mjames | 1 | /**************************************************************************//** |
| 2 | * @file os_tick_ptim.c |
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| 3 | * @brief CMSIS OS Tick implementation for Private Timer |
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| 4 | * @version V1.0.2 |
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| 5 | * @date 02. March 2018 |
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| 6 | ******************************************************************************/ |
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| 7 | /* |
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| 8 | * Copyright (c) 2017-2018 Arm Limited. All rights reserved. |
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| 9 | * |
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| 10 | * SPDX-License-Identifier: Apache-2.0 |
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| 11 | * |
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| 12 | * Licensed under the Apache License, Version 2.0 (the License); you may |
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| 13 | * not use this file except in compliance with the License. |
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| 14 | * You may obtain a copy of the License at |
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| 15 | * |
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| 16 | * www.apache.org/licenses/LICENSE-2.0 |
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| 17 | * |
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| 18 | * Unless required by applicable law or agreed to in writing, software |
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| 19 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
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| 20 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 21 | * See the License for the specific language governing permissions and |
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| 22 | * limitations under the License. |
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| 23 | */ |
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| 24 | |||
| 25 | #include "RTE_Components.h" |
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| 26 | #include CMSIS_device_header |
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| 27 | |||
| 28 | #if defined(PTIM) |
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| 29 | |||
| 30 | #include "os_tick.h" |
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| 31 | #include "irq_ctrl.h" |
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| 32 | |||
| 33 | #ifndef PTIM_IRQ_PRIORITY |
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| 34 | #define PTIM_IRQ_PRIORITY 0xFFU |
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| 35 | #endif |
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| 36 | |||
| 37 | static uint8_t PTIM_PendIRQ; // Timer interrupt pending flag |
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| 38 | |||
| 39 | // Setup OS Tick. |
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| 40 | int32_t OS_Tick_Setup (uint32_t freq, IRQHandler_t handler) { |
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| 41 | uint32_t load; |
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| 42 | uint32_t prio; |
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| 43 | uint32_t bits; |
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| 44 | |||
| 45 | if (freq == 0U) { |
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| 46 | return (-1); |
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| 47 | } |
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| 48 | |||
| 49 | PTIM_PendIRQ = 0U; |
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| 50 | |||
| 51 | // Private Timer runs with the system frequency |
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| 52 | load = (SystemCoreClock / freq) - 1U; |
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| 53 | |||
| 54 | // Disable Private Timer and set load value |
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| 55 | PTIM_SetControl (0U); |
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| 56 | PTIM_SetLoadValue (load); |
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| 57 | |||
| 58 | // Disable corresponding IRQ |
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| 59 | IRQ_Disable (PrivTimer_IRQn); |
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| 60 | IRQ_ClearPending(PrivTimer_IRQn); |
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| 61 | |||
| 62 | // Determine number of implemented priority bits |
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| 63 | IRQ_SetPriority (PrivTimer_IRQn, 0xFFU); |
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| 64 | |||
| 65 | prio = IRQ_GetPriority (PrivTimer_IRQn); |
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| 66 | |||
| 67 | // At least bits [7:4] must be implemented |
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| 68 | if ((prio & 0xF0U) == 0U) { |
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| 69 | return (-1); |
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| 70 | } |
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| 71 | |||
| 72 | for (bits = 0; bits < 4; bits++) { |
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| 73 | if ((prio & 0x01) != 0) { |
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| 74 | break; |
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| 75 | } |
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| 76 | prio >>= 1; |
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| 77 | } |
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| 78 | |||
| 79 | // Adjust configured priority to the number of implemented priority bits |
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| 80 | prio = (PTIM_IRQ_PRIORITY << bits) & 0xFFUL; |
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| 81 | |||
| 82 | // Set Private Timer interrupt priority |
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| 83 | IRQ_SetPriority(PrivTimer_IRQn, prio-1U); |
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| 84 | |||
| 85 | // Set edge-triggered IRQ |
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| 86 | IRQ_SetMode(PrivTimer_IRQn, IRQ_MODE_TRIG_EDGE); |
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| 87 | |||
| 88 | // Register tick interrupt handler function |
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| 89 | IRQ_SetHandler(PrivTimer_IRQn, handler); |
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| 90 | |||
| 91 | // Enable corresponding interrupt |
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| 92 | IRQ_Enable (PrivTimer_IRQn); |
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| 93 | |||
| 94 | // Set bits: IRQ enable and Auto reload |
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| 95 | PTIM_SetControl (0x06U); |
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| 96 | |||
| 97 | return (0); |
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| 98 | } |
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| 99 | |||
| 100 | /// Enable OS Tick. |
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| 101 | void OS_Tick_Enable (void) { |
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| 102 | uint32_t ctrl; |
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| 103 | |||
| 104 | // Set pending interrupt if flag set |
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| 105 | if (PTIM_PendIRQ != 0U) { |
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| 106 | PTIM_PendIRQ = 0U; |
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| 107 | IRQ_SetPending (PrivTimer_IRQn); |
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| 108 | } |
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| 109 | |||
| 110 | // Start the Private Timer |
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| 111 | ctrl = PTIM_GetControl(); |
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| 112 | // Set bit: Timer enable |
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| 113 | ctrl |= 1U; |
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| 114 | PTIM_SetControl (ctrl); |
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| 115 | } |
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| 116 | |||
| 117 | /// Disable OS Tick. |
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| 118 | void OS_Tick_Disable (void) { |
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| 119 | uint32_t ctrl; |
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| 120 | |||
| 121 | // Stop the Private Timer |
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| 122 | ctrl = PTIM_GetControl(); |
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| 123 | // Clear bit: Timer enable |
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| 124 | ctrl &= ~1U; |
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| 125 | PTIM_SetControl (ctrl); |
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| 126 | |||
| 127 | // Remember pending interrupt flag |
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| 128 | if (IRQ_GetPending(PrivTimer_IRQn) != 0) { |
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| 129 | IRQ_ClearPending (PrivTimer_IRQn); |
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| 130 | PTIM_PendIRQ = 1U; |
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| 131 | } |
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| 132 | } |
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| 133 | |||
| 134 | // Acknowledge OS Tick IRQ. |
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| 135 | void OS_Tick_AcknowledgeIRQ (void) { |
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| 136 | PTIM_ClearEventFlag(); |
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| 137 | } |
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| 138 | |||
| 139 | // Get OS Tick IRQ number. |
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| 140 | int32_t OS_Tick_GetIRQn (void) { |
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| 141 | return (PrivTimer_IRQn); |
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| 142 | } |
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| 143 | |||
| 144 | // Get OS Tick clock. |
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| 145 | uint32_t OS_Tick_GetClock (void) { |
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| 146 | return (SystemCoreClock); |
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| 147 | } |
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| 148 | |||
| 149 | // Get OS Tick interval. |
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| 150 | uint32_t OS_Tick_GetInterval (void) { |
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| 151 | return (PTIM_GetLoadValue() + 1U); |
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| 152 | } |
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| 153 | |||
| 154 | // Get OS Tick count value. |
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| 155 | uint32_t OS_Tick_GetCount (void) { |
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| 156 | uint32_t load = PTIM_GetLoadValue(); |
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| 157 | return (load - PTIM_GetCurrentValue()); |
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| 158 | } |
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| 159 | |||
| 160 | // Get OS Tick overflow status. |
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| 161 | uint32_t OS_Tick_GetOverflow (void) { |
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| 162 | return (PTIM->ISR & 1); |
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| 163 | } |
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| 164 | |||
| 165 | #endif // PTIM |