added prescaler for 16 bit pwm in LPC1347 target
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Diff: targets/hal/TARGET_ARM_SSG/TARGET_MPS2/us_ticker.c
- Revision:
- 144:ef7eb2e8f9f7
- Parent:
- 80:bdf1132a57cf
--- a/targets/hal/TARGET_ARM_SSG/TARGET_MPS2/us_ticker.c Tue Aug 02 14:07:36 2016 +0000 +++ b/targets/hal/TARGET_ARM_SSG/TARGET_MPS2/us_ticker.c Fri Sep 02 15:07:44 2016 +0100 @@ -1,82 +1,82 @@ -/* mbed Microcontroller Library - * Copyright (c) 2006-2015 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_TIMER1 CMSDK_DUALTIMER1 -#define US_TICKER_TIMER2 CMSDK_DUALTIMER2 -#define US_TICKER_TIMER_IRQn DUALTIMER_IRQn - -int us_ticker_inited = 0; - -void us_ticker_init(void) { - if (us_ticker_inited) return; - us_ticker_inited = 1; - - US_TICKER_TIMER1->TimerControl = 0x0; // disable timer - US_TICKER_TIMER2->TimerControl = 0x00; // disable timer - US_TICKER_TIMER1->TimerLoad = 0xFFFFFFFF; - US_TICKER_TIMER2->TimerLoad = 0xFFFFFFFF; - - US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode - US_TICKER_TIMER2->TimerControl = 0x42; // enable interrupt and set to 32 bit counter - - US_TICKER_TIMER1->TimerControl |= 0x80; // enable counter - US_TICKER_TIMER2->TimerControl |= 0x80; // enable counter - - NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler); - NVIC_EnableIRQ(US_TICKER_TIMER_IRQn); -} - -uint32_t us_ticker_read() { -uint32_t return_value = 0; - if (!us_ticker_inited) - us_ticker_init(); - return_value = ((~US_TICKER_TIMER2->TimerValue)/25); - return return_value; -} - -void us_ticker_set_interrupt(timestamp_t timestamp) { -int delta = 0; - if (!us_ticker_inited) - us_ticker_init(); - delta = (int)(timestamp - us_ticker_read()); - if (delta <= 0) { - // This event was in the past: - us_ticker_irq_handler(); - return; - } - // enable interrupt - US_TICKER_TIMER1->TimerControl = 0x0; // disable timer - US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode - US_TICKER_TIMER1->TimerLoad = (delta)*25; //initialise the timer value - US_TICKER_TIMER1->TimerControl |= 0x80; //enable timer -} - -void us_ticker_disable_interrupt(void) { - - US_TICKER_TIMER1->TimerControl &= 0xDF; - US_TICKER_TIMER2->TimerControl &= 0xDF; - -} - -void us_ticker_clear_interrupt(void) { - - US_TICKER_TIMER1->TimerIntClr = 0x1; - US_TICKER_TIMER2->TimerIntClr = 0x1; - -} +/* mbed Microcontroller Library + * Copyright (c) 2006-2015 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_TIMER1 CMSDK_DUALTIMER1 +#define US_TICKER_TIMER2 CMSDK_DUALTIMER2 +#define US_TICKER_TIMER_IRQn DUALTIMER_IRQn + +int us_ticker_inited = 0; + +void us_ticker_init(void) { + if (us_ticker_inited) return; + us_ticker_inited = 1; + + US_TICKER_TIMER1->TimerControl = 0x0; // disable timer + US_TICKER_TIMER2->TimerControl = 0x00; // disable timer + US_TICKER_TIMER1->TimerLoad = 0xFFFFFFFF; + US_TICKER_TIMER2->TimerLoad = 0xFFFFFFFF; + + US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode + US_TICKER_TIMER2->TimerControl = 0x42; // enable interrupt and set to 32 bit counter + + US_TICKER_TIMER1->TimerControl |= 0x80; // enable counter + US_TICKER_TIMER2->TimerControl |= 0x80; // enable counter + + NVIC_SetVector(US_TICKER_TIMER_IRQn, (uint32_t)us_ticker_irq_handler); + NVIC_EnableIRQ(US_TICKER_TIMER_IRQn); +} + +uint32_t us_ticker_read() { +uint32_t return_value = 0; + if (!us_ticker_inited) + us_ticker_init(); + return_value = ((~US_TICKER_TIMER2->TimerValue)/25); + return return_value; +} + +void us_ticker_set_interrupt(timestamp_t timestamp) { +int delta = 0; + if (!us_ticker_inited) + us_ticker_init(); + delta = (int)(timestamp - us_ticker_read()); + if (delta <= 0) { + // This event was in the past: + us_ticker_irq_handler(); + return; + } + // enable interrupt + US_TICKER_TIMER1->TimerControl = 0x0; // disable timer + US_TICKER_TIMER1->TimerControl = 0x62; // enable interrupt and set to 32 bit counter and set to periodic mode + US_TICKER_TIMER1->TimerLoad = (delta)*25; //initialise the timer value + US_TICKER_TIMER1->TimerControl |= 0x80; //enable timer +} + +void us_ticker_disable_interrupt(void) { + + US_TICKER_TIMER1->TimerControl &= 0xDF; + US_TICKER_TIMER2->TimerControl &= 0xDF; + +} + +void us_ticker_clear_interrupt(void) { + + US_TICKER_TIMER1->TimerIntClr = 0x1; + US_TICKER_TIMER2->TimerIntClr = 0x1; + +}