mbed library sources. Supersedes mbed-src.
Fork of mbed by
targets/hal/TARGET_Atmel/TARGET_SAM_CortexM4/lp_ticker.c
- Committer:
- rodriguise
- Date:
- 2016-10-17
- Revision:
- 148:4802eb17e82b
- Parent:
- 107:414e9c822e99
File content as of revision 148:4802eb17e82b:
/* 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 "cmsis.h" #include <stddef.h> #include "lp_ticker_api.h" #include "mbed_assert.h" #include "sleep_api.h" #include "compiler.h" #include "sysclk.h" #include "tc.h" #include "us_ticker_api.h" uint8_t lp_ticker_inited = 0; extern volatile uint8_t us_ticker_inited; extern uint8_t g_sys_init; extern volatile uint32_t overflow32bitcounter; volatile uint16_t lp_ticker_16bit_counter; volatile uint16_t lp_ticker_interrupt_counter; volatile uint16_t lp_ticker_interrupt_offset; volatile uint32_t lpoverflow32bitcounter = 0; #define TICKER_COUNTER_lp TC0 #define TICKER_COUNTER_CLK2 ID_TC2 #define TICKER_COUNTER_CHANNEL2 2 #define TICKER_COUNTER_IRQn2 TC2_IRQn #define TICKER_COUNTER_Handlr2 TC2_Handler #define OVERFLOW_16bit_VALUE 0xFFFF void TICKER_COUNTER_Handlr2(void) { uint32_t status=tc_get_status(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2); uint32_t interrupmask=tc_get_interrupt_mask(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2); if (((status & interrupmask) & TC_IER_CPCS)) { if(lp_ticker_interrupt_counter) { lp_ticker_interrupt_counter--; } else { if(lp_ticker_interrupt_offset) { tc_stop(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2); tc_write_rc(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2, (uint32_t)lp_ticker_interrupt_offset); tc_start(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2); lp_ticker_interrupt_offset=0; } else { lp_ticker_irq_handler(); } } } } void lp_ticker_init(void) { if(lp_ticker_inited) return; if (!us_ticker_inited) us_ticker_init(); sysclk_enable_peripheral_clock(TICKER_COUNTER_CLK2); tc_init(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2, TC_CMR_TCCLKS_TIMER_CLOCK4); lp_ticker_inited = 1; } uint32_t lp_ticker_read() { if (!lp_ticker_inited) lp_ticker_init(); return us_ticker_read(); } void lp_ticker_set_interrupt(timestamp_t timestamp) { uint32_t cur_time; int32_t delta; cur_time = lp_ticker_read(); delta = (int32_t)((uint32_t)timestamp - cur_time); if (delta < 0) { /* Event already occurred in past */ lp_ticker_irq_handler(); return; } uint16_t interruptat=0; if(delta > OVERFLOW_16bit_VALUE) { lp_ticker_interrupt_counter= (delta/OVERFLOW_16bit_VALUE) -1; lp_ticker_interrupt_offset=delta%OVERFLOW_16bit_VALUE; interruptat=OVERFLOW_16bit_VALUE; } else { lp_ticker_interrupt_counter=0; lp_ticker_interrupt_offset=0; interruptat=delta; } NVIC_DisableIRQ(TICKER_COUNTER_IRQn2); tc_write_rc(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2, (uint32_t)interruptat); NVIC_ClearPendingIRQ(TICKER_COUNTER_IRQn2); NVIC_SetPriority(TICKER_COUNTER_IRQn2, 0); NVIC_EnableIRQ(TICKER_COUNTER_IRQn2); tc_enable_interrupt(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2, TC_IDR_CPCS ); tc_start(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2); } void lp_ticker_disable_interrupt(void) { tc_stop(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2); tc_disable_interrupt(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2, TC_IDR_CPCS); NVIC_DisableIRQ(TICKER_COUNTER_IRQn2); } void lp_ticker_clear_interrupt(void) { NVIC_ClearPendingIRQ(TICKER_COUNTER_IRQn2); }