mirror of https://github.com/ARMmbed/mbed-os.git
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2020 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "us_ticker_api.h"
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#include "mbed_drv_cfg.h"
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#define SHIFT_NUM 5 /* P0/32 */
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static int us_ticker_inited = 0;
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void us_ticker_init(void)
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{
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GIC_DisableIRQ(OSTMI1_IRQn);
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GIC_ClearPendingIRQ(OSTMI1_IRQn);
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/* Power Control for Peripherals */
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volatile uint8_t dummy_buf;
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CPG.STBCR3.BYTE &= ~(0x20u);
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dummy_buf = CPG.STBCR3.BYTE; /* (Dummy read) */
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(void)dummy_buf;
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if (us_ticker_inited) {
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return;
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}
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us_ticker_inited = 1;
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// timer settings
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OSTM1.OSTMnTT.BYTE = 0x01; /* Stop the counter and clears the OSTM1TE bit. */
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OSTM1.OSTMnCTL.BYTE = 0x02; /* Free running timer mode. Interrupt disabled when star counter */
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OSTM1.OSTMnTS.BYTE = 0x1; /* Start the counter and sets the OSTM0TE bit. */
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// INTC settings
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InterruptHandlerRegister(OSTMI1_IRQn, (void (*)(uint32_t))us_ticker_irq_handler);
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GIC_SetPriority(OSTMI1_IRQn, 5);
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GIC_SetConfiguration(OSTMI1_IRQn, 3);
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}
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void us_ticker_free(void)
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{
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GIC_DisableIRQ(OSTMI1_IRQn);
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GIC_ClearPendingIRQ(OSTMI1_IRQn);
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/* Power Control for Peripherals */
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volatile uint8_t dummy_buf;
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CPG.STBCR3.BYTE |= 0x20u;
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dummy_buf = CPG.STBCR3.BYTE; /* (Dummy read) */
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(void)dummy_buf;
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}
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uint32_t us_ticker_read()
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{
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return (uint32_t)(OSTM1.OSTMnCNT.LONG >> SHIFT_NUM);
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}
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void us_ticker_set_interrupt(timestamp_t timestamp)
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{
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OSTM1.OSTMnCMP.LONG = (uint32_t)(timestamp << SHIFT_NUM);
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GIC_EnableIRQ(OSTMI1_IRQn);
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}
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void us_ticker_fire_interrupt(void)
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{
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GIC_SetPendingIRQ(OSTMI1_IRQn);
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GIC_EnableIRQ(OSTMI1_IRQn);
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}
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void us_ticker_disable_interrupt(void)
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{
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GIC_DisableIRQ(OSTMI1_IRQn);
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}
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void us_ticker_clear_interrupt(void)
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{
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GIC_ClearPendingIRQ(OSTMI1_IRQn);
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}
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const ticker_info_t *us_ticker_get_info()
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{
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static const ticker_info_t info = {
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(uint32_t)((float)RENESAS_RZ_A2_P0_CLK * 2 / (float)(1 << SHIFT_NUM) + 0.5f),
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(32 - SHIFT_NUM)
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};
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return &info;
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}
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