339 lines
8.7 KiB
C
339 lines
8.7 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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/**
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* @file LPC122x/gpt_lld.c
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* @brief LPC122x GPT subsystem low level driver source.
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*
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* @addtogroup GPT
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#if HAL_USE_GPT || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief GPT1 driver identifier.
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* @note The driver GPT1 allocates the complex timer CT16B0 when enabled.
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*/
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#if LPC122x_GPT_USE_CT16B0 || defined(__DOXYGEN__)
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GPTDriver GPTD1;
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#endif
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/**
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* @brief GPT2 driver identifier.
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* @note The driver GPT2 allocates the timer CT16B1 when enabled.
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*/
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#if LPC122x_GPT_USE_CT16B1 || defined(__DOXYGEN__)
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GPTDriver GPTD2;
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#endif
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/**
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* @brief GPT3 driver identifier.
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* @note The driver GPT3 allocates the timer CT32B0 when enabled.
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*/
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#if LPC122x_GPT_USE_CT32B0 || defined(__DOXYGEN__)
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GPTDriver GPTD3;
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#endif
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/**
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* @brief GPT4 driver identifier.
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* @note The driver GPT4 allocates the timer CT32B1 when enabled.
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*/
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#if LPC122x_GPT_USE_CT32B1 || defined(__DOXYGEN__)
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GPTDriver GPTD4;
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#endif
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/**
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* @brief Shared IRQ handler.
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*
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* @param[in] gptp pointer to a @p GPTDriver object
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*/
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static void gpt_lld_serve_interrupt(GPTDriver *gptp) {
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gptp->tmr->IR = 1; /* Clear interrupt on match MR0.*/
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if (gptp->state == GPT_ONESHOT) {
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gptp->state = GPT_READY; /* Back in GPT_READY state. */
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gpt_lld_stop_timer(gptp); /* Timer automatically stopped. */
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}
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gptp->config->callback(gptp);
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}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if LPC122x_GPT_USE_CT16B0
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/**
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* @brief CT16B0 interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(Vector74) {
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CH_IRQ_PROLOGUE();
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gpt_lld_serve_interrupt(&GPTD1);
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CH_IRQ_EPILOGUE();
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}
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#endif /* LPC122x_GPT_USE_CT16B0 */
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#if LPC122x_GPT_USE_CT16B1
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/**
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* @brief CT16B1 interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(Vector78) {
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CH_IRQ_PROLOGUE();
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gpt_lld_serve_interrupt(&GPTD2);
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CH_IRQ_EPILOGUE();
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}
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#endif /* LPC122x_GPT_USE_CT16B0 */
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#if LPC122x_GPT_USE_CT32B0
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/**
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* @brief CT32B0 interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(Vector7C) {
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CH_IRQ_PROLOGUE();
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gpt_lld_serve_interrupt(&GPTD3);
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CH_IRQ_EPILOGUE();
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}
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#endif /* LPC122x_GPT_USE_CT32B0 */
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#if LPC122x_GPT_USE_CT32B1
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/**
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* @brief CT32B1 interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(Vector80) {
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CH_IRQ_PROLOGUE();
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gpt_lld_serve_interrupt(&GPTD4);
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CH_IRQ_EPILOGUE();
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}
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#endif /* LPC122x_GPT_USE_CT32B1 */
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level GPT driver initialization.
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*
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* @notapi
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*/
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void gpt_lld_init(void) {
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#if LPC122x_GPT_USE_CT16B0
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/* Driver initialization.*/
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GPTD1.tmr = LPC_CT16B0;
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gptObjectInit(&GPTD1);
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#endif
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#if LPC122x_GPT_USE_CT16B1
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/* Driver initialization.*/
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GPTD2.tmr = LPC_CT16B1;
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gptObjectInit(&GPTD2);
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#endif
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#if LPC122x_GPT_USE_CT32B0
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/* Driver initialization.*/
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GPTD3.tmr = LPC_CT32B0;
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gptObjectInit(&GPTD3);
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#endif
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#if LPC122x_GPT_USE_CT32B1
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/* Driver initialization.*/
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GPTD4.tmr = LPC_CT32B1;
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gptObjectInit(&GPTD4);
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#endif
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}
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/**
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* @brief Configures and activates the GPT peripheral.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @notapi
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*/
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void gpt_lld_start(GPTDriver *gptp) {
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uint32_t pr;
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if (gptp->state == GPT_STOP) {
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/* Clock activation.*/
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#if LPC122x_GPT_USE_CT16B0
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if (&GPTD1 == gptp) {
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 7);
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nvicEnableVector(TIMER_16_0_IRQn, CORTEX_PRIORITY_MASK(2));
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}
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#endif
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#if LPC122x_GPT_USE_CT16B1
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if (&GPTD2 == gptp) {
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 8);
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nvicEnableVector(TIMER_16_1_IRQn, CORTEX_PRIORITY_MASK(3));
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}
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#endif
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#if LPC122x_GPT_USE_CT32B0
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if (&GPTD3 == gptp) {
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 9);
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nvicEnableVector(TIMER_32_0_IRQn, CORTEX_PRIORITY_MASK(2));
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}
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#endif
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#if LPC122x_GPT_USE_CT32B1
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if (&GPTD4 == gptp) {
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 10);
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nvicEnableVector(TIMER_32_1_IRQn, CORTEX_PRIORITY_MASK(2));
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}
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#endif
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}
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/* Prescaler value calculation.*/
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pr = (uint16_t)((LPC122x_SYSCLK / gptp->config->frequency) - 1);
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chDbgAssert(((uint32_t)(pr + 1) * gptp->config->frequency) == LPC122x_SYSCLK,
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"gpt_lld_start(), #1", "invalid frequency");
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/* Timer configuration.*/
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gptp->tmr->PR = pr;
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gptp->tmr->IR = 1;
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gptp->tmr->MCR = 0;
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gptp->tmr->TCR = 0;
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}
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/**
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* @brief Deactivates the GPT peripheral.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @notapi
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*/
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void gpt_lld_stop(GPTDriver *gptp) {
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if (gptp->state == GPT_READY) {
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gptp->tmr->MCR = 0;
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gptp->tmr->TCR = 0;
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#if LPC122x_GPT_USE_CT16B0
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if (&GPTD1 == gptp) {
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nvicDisableVector(TIMER_16_0_IRQn);
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 7);
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}
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#endif
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#if LPC122x_GPT_USE_CT16B1
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if (&GPTD2 == gptp) {
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nvicDisableVector(TIMER_16_1_IRQn);
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 8);
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}
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#endif
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#if LPC122x_GPT_USE_CT32B0
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if (&GPTD3 == gptp) {
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nvicDisableVector(TIMER_32_0_IRQn);
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 9);
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}
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#endif
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#if LPC122x_GPT_USE_CT32B1
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if (&GPTD4 == gptp) {
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nvicDisableVector(TIMER_32_1_IRQn);
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 10);
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}
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#endif
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}
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}
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/**
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* @brief Starts the timer in continuous mode.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] interval period in ticks
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*
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* @notapi
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*/
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void gpt_lld_start_timer(GPTDriver *gptp, gptcnt_t interval) {
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gptp->tmr->MR0 = interval - 1;
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gptp->tmr->IR = 1;
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gptp->tmr->MCR = 3; /* IRQ and clr TC on match MR0. */
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gptp->tmr->TCR = 2; /* Reset counter and prescaler. */
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gptp->tmr->TCR = 1; /* Timer enabled. */
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}
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/**
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* @brief Stops the timer.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @notapi
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*/
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void gpt_lld_stop_timer(GPTDriver *gptp) {
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gptp->tmr->IR = 1;
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gptp->tmr->MCR = 0;
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gptp->tmr->TCR = 0;
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}
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/**
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* @brief Starts the timer in one shot mode and waits for completion.
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* @details This function specifically polls the timer waiting for completion
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* in order to not have extra delays caused by interrupt servicing,
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* this function is only recommended for short delays.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] interval time interval in ticks
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*
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* @notapi
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*/
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void gpt_lld_polled_delay(GPTDriver *gptp, gptcnt_t interval) {
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gptp->tmr->MR0 = interval - 1;
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gptp->tmr->IR = 1;
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gptp->tmr->MCR = 4; /* Stop TC on match MR0. */
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gptp->tmr->TCR = 2; /* Reset counter and prescaler. */
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gptp->tmr->TCR = 1; /* Timer enabled. */
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while (gptp->tmr->TCR & 1)
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;
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}
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#endif /* HAL_USE_GPT */
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/** @} */
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