mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
Diff: targets/hal/TARGET_NXP/TARGET_LPC176X/us_ticker.c
- Revision:
- 144:ef7eb2e8f9f7
- Parent:
- 0:9b334a45a8ff
--- a/targets/hal/TARGET_NXP/TARGET_LPC176X/us_ticker.c Tue Aug 02 14:07:36 2016 +0000 +++ b/targets/hal/TARGET_NXP/TARGET_LPC176X/us_ticker.c Fri Sep 02 15:07:44 2016 +0100 @@ -1,64 +1,64 @@ -/* mbed Microcontroller Library - * Copyright (c) 2006-2013 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 <stddef.h> -#include "us_ticker_api.h" -#include "PeripheralNames.h" - -#define US_TICKER_TIMER ((LPC_TIM_TypeDef *)LPC_TIM3_BASE) -#define US_TICKER_TIMER_IRQn TIMER3_IRQn - -int us_ticker_inited = 0; - -void us_ticker_init(void) { - if (us_ticker_inited) return; - us_ticker_inited = 1; - - LPC_SC->PCONP |= 1 << 23; // Clock TIMER_3 - - US_TICKER_TIMER->CTCR = 0x0; // timer mode - uint32_t PCLK = SystemCoreClock / 4; - - US_TICKER_TIMER->TCR = 0x2; // reset - - uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks) - US_TICKER_TIMER->PR = prescale - 1; - US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0 - - NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler); - NVIC_EnableIRQ(US_TICKER_TIMER_IRQn); -} - -uint32_t us_ticker_read() { - if (!us_ticker_inited) - us_ticker_init(); - - return US_TICKER_TIMER->TC; -} - -void us_ticker_set_interrupt(timestamp_t timestamp) { - // set match value - US_TICKER_TIMER->MR0 = (uint32_t)timestamp; - // enable match interrupt - US_TICKER_TIMER->MCR |= 1; -} - -void us_ticker_disable_interrupt(void) { - US_TICKER_TIMER->MCR &= ~1; -} - -void us_ticker_clear_interrupt(void) { - US_TICKER_TIMER->IR = 1; -} +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 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 <stddef.h> +#include "us_ticker_api.h" +#include "PeripheralNames.h" + +#define US_TICKER_TIMER ((LPC_TIM_TypeDef *)LPC_TIM3_BASE) +#define US_TICKER_TIMER_IRQn TIMER3_IRQn + +int us_ticker_inited = 0; + +void us_ticker_init(void) { + if (us_ticker_inited) return; + us_ticker_inited = 1; + + LPC_SC->PCONP |= 1 << 23; // Clock TIMER_3 + + US_TICKER_TIMER->CTCR = 0x0; // timer mode + uint32_t PCLK = SystemCoreClock / 4; + + US_TICKER_TIMER->TCR = 0x2; // reset + + uint32_t prescale = PCLK / 1000000; // default to 1MHz (1 us ticks) + US_TICKER_TIMER->PR = prescale - 1; + US_TICKER_TIMER->TCR = 1; // enable = 1, reset = 0 + + NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler); + NVIC_EnableIRQ(US_TICKER_TIMER_IRQn); +} + +uint32_t us_ticker_read() { + if (!us_ticker_inited) + us_ticker_init(); + + return US_TICKER_TIMER->TC; +} + +void us_ticker_set_interrupt(timestamp_t timestamp) { + // set match value + US_TICKER_TIMER->MR0 = (uint32_t)timestamp; + // enable match interrupt + US_TICKER_TIMER->MCR |= 1; +} + +void us_ticker_disable_interrupt(void) { + US_TICKER_TIMER->MCR &= ~1; +} + +void us_ticker_clear_interrupt(void) { + US_TICKER_TIMER->IR = 1; +}