mbed library sources
Dependents: Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more
Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.
Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.
If you are looking for a stable and tested release, please import one of the official mbed library releases:
Import librarymbed
The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.
targets/hal/TARGET_RENESAS/TARGET_RZ_A1H/us_ticker.c
- Committer:
- mbed_official
- Date:
- 2014-11-06
- Revision:
- 390:35c2c1cf29cd
- Child:
- 430:d406b7919023
File content as of revision 390:35c2c1cf29cd:
/* 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" #include "mtu2_iodefine.h" #define US_TICKER_TIMER (OSTM0.OSTMnCMP) #define US_TICKER_TIMER_IRQn TIMER3_IRQn int us_ticker_inited = 0; void us_ticker_interrupt(void) { us_ticker_irq_handler(); GIC_EndInterrupt(TGI2A_IRQn); } void us_ticker_init(void) { if (us_ticker_inited) return; us_ticker_inited = 1; /* Power Control for Peripherals */ CPGSTBCR3 &= ~ 0x8; // turn on MTU2 // timer settings MTU2.TSYR = 0x6; // cascading T_1-T_2 MTU2.TCR_2 = 0x03; // divider 1/64 MTU2.TCR_1 = 0x07; // count-up from T_2 pulse(cascade) MTU2.TCNT_1 = 0x00; // counter value set to 0 MTU2.TCNT_2 = 0x00; // MTU2.TSTR |= 0x06; // MTU2.TSR_2 = 0xc0; // timer start // INTC settings InterruptHandlerRegister(TGI2A_IRQn, (void (*)(uint32_t))us_ticker_interrupt); GIC_SetPriority(TGI2A_IRQn, 5); GIC_EnableIRQ(TGI2A_IRQn); __enable_irq(); } //static const float PCLK =33.33, // dummy //PRESCALE =64.0; // dummy static const float FACTOR_C2U = 1.9201920192019204, //(PRESCALE/PCLK) FACTOR_U2C = 0.52078125; //(PCLK/PRESCALE) #define F_CLK2us(val) ((uint32_t)((val)*FACTOR_C2U)) #define F_us2CLK(val) ((uint32_t)((val)*FACTOR_U2C)) uint32_t us_ticker_read() { static uint32_t max_val = 0x8551eb85; //*F_us2CLK(0xffffffff)+1; uint32_t val; if (!us_ticker_inited) us_ticker_init(); val = MTU2.TCNT_1<<16 | MTU2.TCNT_2; // concat cascaded Counters if (val > max_val) { // if overflow (in us-timer) val -= max_val; // correct value MTU2.TCNT_1 = 0; // reset counter MTU2.TCNT_2 = val; } val = F_CLK2us(val); return val; } void us_ticker_set_interrupt(timestamp_t timestamp) { // set match value timestamp = F_us2CLK(timestamp); MTU2.TGRA_2 = timestamp & 0xffff; // enable match interrupt MTU2.TIER_2 = 0x01; } void us_ticker_disable_interrupt(void) { MTU2.TIER_2 &= ~(0xc0); } void us_ticker_clear_interrupt(void) { MTU2.TSR_2 &= 0xc0; }