Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Atmel/TARGET_SAM_CortexM4/lp_ticker.c@107:414e9c822e99, 2016-04-05 (annotated)

Committer:
mbed_official
Date:
Tue Apr 05 18:15:12 2016 +0100
Revision:
107:414e9c822e99
Synchronized with git revision dd3c5f7fa8473776950ec6e15c0e4adedb21cf2f



Full URL: https://github.com/mbedmicro/mbed/commit/dd3c5f7fa8473776950ec6e15c0e4adedb21cf2f/



* * Base Commit for SAMG55J19. No errors and no implementations.



* * Added gpio files.



* * Added pinmap files.



* * Base commit for usticker implementation.



* * Added gcc_arm export functionality



* * added files for usticker.

* added template file for samd55j19



* * GPIO IRQ base commit.



* * updated with changes in gpio irq driver.



* * Reverted back unexpected commit in SAM0 gpio driver.



* * updated gpio_irq driver.



* * correction in gpio and gpio_irq drivers.

* added support for some test for gpio.



* * base commit for peripheralpins for usart.

* update in serial apis.



* * updated serial apis.



* * updated serial apis and test.



* * update serial apis for asynch apis.



* * updated peripheral pins for i2c and spi.

* added test support for serial flow control



* * Base commit for low power ticker implementation.



* * base commit for port apis.

* update in lp ticker apis.



* * Added test support for port.



* * base commit for sleep apis.



* * Base commit for spi.



* * updated with corrections in gpio irq.

* usticker file updated with latest source.



* * updated with corrections for unexpected board reset.

* updated gpio irq apis and added test for the same.



* * updated sleep api for deepsleep.



* * updated serial apis.



* Added uc_ticker and SPI api implementations



* Removed unused SPI pin map



* Updated review feedback



* * implemented lpticker with TC module.

* updated files for KnR Coding Statndard.

* updated serial and usticker apis.



* * Base commit for AnalogueIn apis.



* * RTC apis base commit without implementation.



* * Updated with corrections in lpticker implementations.



* * Added implementation for rtc apis.



* * updated with implementations for pwm.

* changed usticker from TC0 to TC1.



* Added I2C support



* * removed setvector usage from usticker and lpticker implementations

* added tests for SAMG55J19



* * Removed unwanted .o and .d files.

* Updated I2C files for KnR Coding Standards.

* Update for reducing compiler warnings in peripheralpins,c

* Updated with PWM free implementation.



* * Removed unwanted headers file inclusion.

* Compiler warning corrections in serial_api.c



* * Updated ADC with 16 bit mode initialization and code refinements.

* Updated PWM with code refinements.



* Updated I2C review feedback and fixed style



* Updated target name for SAMG55



* * Added Test Support for I2C with AT30TSE75X and Added Support for SAMG55J19 in atmelstudio project exporter



* * Added Test Support for I2C with AT30TSE75X and Added Support for SAMG55J19 in atmelstudio project exporter



* Used NVIC_SetVector for interrupt callback



* Removed Target macro define in test



* Updated test cases to have SAMG55 support



* * Updated with corrections in Serial and SPI asynchronous implementations.

* Updated deepsleep api implementation

* Merged LP_Ticker with latest code from mbed 3.0 repository.



* * updated with corrections in I2C Asynch implementation.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 107:414e9c822e99 1 /* mbed Microcontroller Library
mbed_official 107:414e9c822e99 2 * Copyright (c) 2006-2015 ARM Limited
mbed_official 107:414e9c822e99 3 *
mbed_official 107:414e9c822e99 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 107:414e9c822e99 5 * you may not use this file except in compliance with the License.
mbed_official 107:414e9c822e99 6 * You may obtain a copy of the License at
mbed_official 107:414e9c822e99 7 *
mbed_official 107:414e9c822e99 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 107:414e9c822e99 9 *
mbed_official 107:414e9c822e99 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 107:414e9c822e99 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 107:414e9c822e99 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 107:414e9c822e99 13 * See the License for the specific language governing permissions and
mbed_official 107:414e9c822e99 14 * limitations under the License.
mbed_official 107:414e9c822e99 15 */
mbed_official 107:414e9c822e99 16
mbed_official 107:414e9c822e99 17 #include "cmsis.h"
mbed_official 107:414e9c822e99 18 #include <stddef.h>
mbed_official 107:414e9c822e99 19 #include "lp_ticker_api.h"
mbed_official 107:414e9c822e99 20 #include "mbed_assert.h"
mbed_official 107:414e9c822e99 21 #include "sleep_api.h"
mbed_official 107:414e9c822e99 22 #include "compiler.h"
mbed_official 107:414e9c822e99 23 #include "sysclk.h"
mbed_official 107:414e9c822e99 24 #include "tc.h"
mbed_official 107:414e9c822e99 25 #include "us_ticker_api.h"
mbed_official 107:414e9c822e99 26
mbed_official 107:414e9c822e99 27 uint8_t lp_ticker_inited = 0;
mbed_official 107:414e9c822e99 28 extern volatile uint8_t us_ticker_inited;
mbed_official 107:414e9c822e99 29 extern uint8_t g_sys_init;
mbed_official 107:414e9c822e99 30 extern volatile uint32_t overflow32bitcounter;
mbed_official 107:414e9c822e99 31 volatile uint16_t lp_ticker_16bit_counter;
mbed_official 107:414e9c822e99 32 volatile uint16_t lp_ticker_interrupt_counter;
mbed_official 107:414e9c822e99 33 volatile uint16_t lp_ticker_interrupt_offset;
mbed_official 107:414e9c822e99 34 volatile uint32_t lpoverflow32bitcounter = 0;
mbed_official 107:414e9c822e99 35
mbed_official 107:414e9c822e99 36 #define TICKER_COUNTER_lp TC0
mbed_official 107:414e9c822e99 37
mbed_official 107:414e9c822e99 38 #define TICKER_COUNTER_CLK2 ID_TC2
mbed_official 107:414e9c822e99 39
mbed_official 107:414e9c822e99 40 #define TICKER_COUNTER_CHANNEL2 2
mbed_official 107:414e9c822e99 41 #define TICKER_COUNTER_IRQn2 TC2_IRQn
mbed_official 107:414e9c822e99 42 #define TICKER_COUNTER_Handlr2 TC2_Handler
mbed_official 107:414e9c822e99 43
mbed_official 107:414e9c822e99 44 #define OVERFLOW_16bit_VALUE 0xFFFF
mbed_official 107:414e9c822e99 45
mbed_official 107:414e9c822e99 46
mbed_official 107:414e9c822e99 47 void TICKER_COUNTER_Handlr2(void)
mbed_official 107:414e9c822e99 48 {
mbed_official 107:414e9c822e99 49 uint32_t status=tc_get_status(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2);
mbed_official 107:414e9c822e99 50 uint32_t interrupmask=tc_get_interrupt_mask(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2);
mbed_official 107:414e9c822e99 51
mbed_official 107:414e9c822e99 52 if (((status & interrupmask) & TC_IER_CPCS)) {
mbed_official 107:414e9c822e99 53 if(lp_ticker_interrupt_counter) {
mbed_official 107:414e9c822e99 54 lp_ticker_interrupt_counter--;
mbed_official 107:414e9c822e99 55 } else {
mbed_official 107:414e9c822e99 56 if(lp_ticker_interrupt_offset) {
mbed_official 107:414e9c822e99 57 tc_stop(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2);
mbed_official 107:414e9c822e99 58 tc_write_rc(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2, (uint32_t)lp_ticker_interrupt_offset);
mbed_official 107:414e9c822e99 59 tc_start(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2);
mbed_official 107:414e9c822e99 60 lp_ticker_interrupt_offset=0;
mbed_official 107:414e9c822e99 61 } else {
mbed_official 107:414e9c822e99 62 lp_ticker_irq_handler();
mbed_official 107:414e9c822e99 63 }
mbed_official 107:414e9c822e99 64 }
mbed_official 107:414e9c822e99 65 }
mbed_official 107:414e9c822e99 66 }
mbed_official 107:414e9c822e99 67
mbed_official 107:414e9c822e99 68 void lp_ticker_init(void)
mbed_official 107:414e9c822e99 69 {
mbed_official 107:414e9c822e99 70 if(lp_ticker_inited)
mbed_official 107:414e9c822e99 71 return;
mbed_official 107:414e9c822e99 72 if (!us_ticker_inited)
mbed_official 107:414e9c822e99 73 us_ticker_init();
mbed_official 107:414e9c822e99 74 sysclk_enable_peripheral_clock(TICKER_COUNTER_CLK2);
mbed_official 107:414e9c822e99 75 tc_init(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2, TC_CMR_TCCLKS_TIMER_CLOCK4);
mbed_official 107:414e9c822e99 76 lp_ticker_inited = 1;
mbed_official 107:414e9c822e99 77 }
mbed_official 107:414e9c822e99 78
mbed_official 107:414e9c822e99 79 uint32_t lp_ticker_read()
mbed_official 107:414e9c822e99 80 {
mbed_official 107:414e9c822e99 81 if (!lp_ticker_inited)
mbed_official 107:414e9c822e99 82 lp_ticker_init();
mbed_official 107:414e9c822e99 83 return us_ticker_read();
mbed_official 107:414e9c822e99 84 }
mbed_official 107:414e9c822e99 85
mbed_official 107:414e9c822e99 86 void lp_ticker_set_interrupt(timestamp_t timestamp)
mbed_official 107:414e9c822e99 87 {
mbed_official 107:414e9c822e99 88 uint32_t cur_time;
mbed_official 107:414e9c822e99 89 int32_t delta;
mbed_official 107:414e9c822e99 90
mbed_official 107:414e9c822e99 91 cur_time = lp_ticker_read();
mbed_official 107:414e9c822e99 92 delta = (int32_t)((uint32_t)timestamp - cur_time);
mbed_official 107:414e9c822e99 93 if (delta < 0) {
mbed_official 107:414e9c822e99 94 /* Event already occurred in past */
mbed_official 107:414e9c822e99 95 lp_ticker_irq_handler();
mbed_official 107:414e9c822e99 96 return;
mbed_official 107:414e9c822e99 97 }
mbed_official 107:414e9c822e99 98
mbed_official 107:414e9c822e99 99 uint16_t interruptat=0;
mbed_official 107:414e9c822e99 100
mbed_official 107:414e9c822e99 101 if(delta > OVERFLOW_16bit_VALUE) {
mbed_official 107:414e9c822e99 102 lp_ticker_interrupt_counter= (delta/OVERFLOW_16bit_VALUE) -1;
mbed_official 107:414e9c822e99 103 lp_ticker_interrupt_offset=delta%OVERFLOW_16bit_VALUE;
mbed_official 107:414e9c822e99 104 interruptat=OVERFLOW_16bit_VALUE;
mbed_official 107:414e9c822e99 105 } else {
mbed_official 107:414e9c822e99 106 lp_ticker_interrupt_counter=0;
mbed_official 107:414e9c822e99 107 lp_ticker_interrupt_offset=0;
mbed_official 107:414e9c822e99 108 interruptat=delta;
mbed_official 107:414e9c822e99 109 }
mbed_official 107:414e9c822e99 110
mbed_official 107:414e9c822e99 111 NVIC_DisableIRQ(TICKER_COUNTER_IRQn2);
mbed_official 107:414e9c822e99 112
mbed_official 107:414e9c822e99 113 tc_write_rc(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2, (uint32_t)interruptat);
mbed_official 107:414e9c822e99 114
mbed_official 107:414e9c822e99 115 NVIC_ClearPendingIRQ(TICKER_COUNTER_IRQn2);
mbed_official 107:414e9c822e99 116 NVIC_SetPriority(TICKER_COUNTER_IRQn2, 0);
mbed_official 107:414e9c822e99 117 NVIC_EnableIRQ(TICKER_COUNTER_IRQn2);
mbed_official 107:414e9c822e99 118 tc_enable_interrupt(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2, TC_IDR_CPCS );
mbed_official 107:414e9c822e99 119
mbed_official 107:414e9c822e99 120 tc_start(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2);
mbed_official 107:414e9c822e99 121 }
mbed_official 107:414e9c822e99 122
mbed_official 107:414e9c822e99 123 void lp_ticker_disable_interrupt(void)
mbed_official 107:414e9c822e99 124 {
mbed_official 107:414e9c822e99 125 tc_stop(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2);
mbed_official 107:414e9c822e99 126 tc_disable_interrupt(TICKER_COUNTER_lp, TICKER_COUNTER_CHANNEL2, TC_IDR_CPCS);
mbed_official 107:414e9c822e99 127 NVIC_DisableIRQ(TICKER_COUNTER_IRQn2);
mbed_official 107:414e9c822e99 128 }
mbed_official 107:414e9c822e99 129
mbed_official 107:414e9c822e99 130 void lp_ticker_clear_interrupt(void)
mbed_official 107:414e9c822e99 131 {
mbed_official 107:414e9c822e99 132 NVIC_ClearPendingIRQ(TICKER_COUNTER_IRQn2);
mbed_official 107:414e9c822e99 133 }