Diff: targets/hal/TARGET_Atmel/TARGET_SAM21/us_ticker.c

Revision:

613:bc40b8d2aec4

Parent:

612:fba1c7dc54c0

Child:

614:9d86c2ae5de0

--- a/targets/hal/TARGET_Atmel/TARGET_SAM21/us_ticker.c	Tue Aug 18 15:00:09 2015 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,165 +0,0 @@
-/* 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 "cmsis.h"
-#include "mbed_assert.h"
-#include "ins_gclk.h"
-#include "compiler.h"
-#include "system.h"
-#include "tc.h"
-#include "tc_interrupt.h"
-
-#define TICKER_COUNTER_uS		TC4
-#define TICKER_COUNTER_IRQn		TC4_IRQn
-#define TICKER_COUNTER_Handlr	TC4_Handler
-
-static int us_ticker_inited = 0;
-extern uint8_t g_sys_init;
-
-struct tc_module us_ticker_module;
-
-
-static inline void tc_clear_interrupt(
-    struct tc_module *const module,
-    const enum tc_callback callback_type)
-{
-    /* Sanity check arguments */
-    MBED_ASSERT(module);
-
-    /* Clear interrupt flags */
-    if (callback_type == TC_CALLBACK_CC_CHANNEL0) {
-        module->hw->COUNT8.INTENCLR.reg = TC_INTFLAG_MC(1);
-    } else if (callback_type == TC_CALLBACK_CC_CHANNEL1) {
-        module->hw->COUNT8.INTENCLR.reg = TC_INTFLAG_MC(2);
-    } else {
-        module->hw->COUNT8.INTENCLR.reg = (1 << callback_type);
-    }
-}
-
-void us_ticker_irq_handler_internal(struct tc_module* us_tc_module)
-{
-    uint32_t status_flags;
-
-    /* Clear TC capture overflow and TC count overflow */
-    status_flags = TC_STATUS_CAPTURE_OVERFLOW | TC_STATUS_COUNT_OVERFLOW;
-    tc_clear_status(&us_ticker_module, status_flags);
-
-    us_ticker_irq_handler();
-}
-
-void us_ticker_init(void)
-{
-    uint32_t			cycles_per_us;
-    uint32_t			prescaler = 0;
-    struct tc_config	config_tc;
-    enum status_code	ret_status;
-
-    if (us_ticker_inited) return;
-    us_ticker_inited = 1;
-
-    if (g_sys_init == 0) {
-        system_init();
-        g_sys_init = 1;
-    }
-
-    tc_get_config_defaults(&config_tc);
-
-    cycles_per_us = system_gclk_gen_get_hz(config_tc.clock_source) / 1000000;
-    MBED_ASSERT(cycles_per_us > 0);
-    /*while((cycles_per_us & 1) == 0 && prescaler <= 10) {
-    	cycles_per_us = cycles_per_us >> 1;
-    	prescaler++;
-    }*/
-    while((cycles_per_us > 1) && (prescaler <= 10)) {
-        cycles_per_us = cycles_per_us >> 1;
-        prescaler++;
-    }
-    if (prescaler >= 9) {
-        prescaler = 7;
-    } else if (prescaler >= 7) {
-        prescaler = 6;
-    } else if (prescaler >= 5) {
-        prescaler = 5;
-    }
-
-    config_tc.clock_prescaler = TC_CTRLA_PRESCALER(prescaler);
-    config_tc.counter_size = TC_COUNTER_SIZE_32BIT;
-    config_tc.run_in_standby = true;
-    config_tc.counter_32_bit.value = 0;
-    config_tc.counter_32_bit.compare_capture_channel[TC_COMPARE_CAPTURE_CHANNEL_0] = 0xFFFFFFFF;
-
-    /* Initialize the timer */
-    ret_status = tc_init(&us_ticker_module, TICKER_COUNTER_uS, &config_tc);
-    MBED_ASSERT(ret_status == STATUS_OK);
-
-    /* Register callback function */
-    tc_register_callback(&us_ticker_module, (tc_callback_t)us_ticker_irq_handler_internal, TC_CALLBACK_CC_CHANNEL0);
-
-    /* Enable the timer module */
-    tc_enable(&us_ticker_module);
-}
-
-uint32_t us_ticker_read()
-{
-    if (!us_ticker_inited)
-        us_ticker_init();
-
-    return tc_get_count_value(&us_ticker_module);
-}
-
-void us_ticker_set_interrupt(timestamp_t timestamp)
-{
-    uint32_t cur_time;
-    int32_t delta;
-
-    cur_time = us_ticker_read();
-    delta = (int32_t)((uint32_t)timestamp - cur_time);
-    if (delta < 0) {
-        /* Event already occurred in past */
-        us_ticker_irq_handler();
-        return;
-    }
-
-    NVIC_DisableIRQ(TICKER_COUNTER_IRQn);
-    NVIC_SetVector(TICKER_COUNTER_IRQn, (uint32_t)TICKER_COUNTER_Handlr);
-
-    /* Enable the callback */
-    tc_enable_callback(&us_ticker_module, TC_CALLBACK_CC_CHANNEL0);
-    tc_set_compare_value(&us_ticker_module, TC_COMPARE_CAPTURE_CHANNEL_0, (uint32_t)timestamp);
-
-    NVIC_EnableIRQ(TICKER_COUNTER_IRQn);
-}
-
-void us_ticker_disable_interrupt(void)
-{
-    /* Disable the callback */
-    tc_disable_callback(&us_ticker_module, TC_CALLBACK_CC_CHANNEL0);
-    NVIC_DisableIRQ(TICKER_COUNTER_IRQn);
-}
-
-void us_ticker_clear_interrupt(void)
-{
-    uint32_t status_flags;
-
-    /* Clear TC channel 0 match */
-    status_flags = TC_STATUS_CHANNEL_0_MATCH;
-    tc_clear_status(&us_ticker_module, status_flags);
-
-    /* Clear the interrupt */
-    tc_clear_interrupt(&us_ticker_module, TC_CALLBACK_CC_CHANNEL0);
-    NVIC_ClearPendingIRQ(TICKER_COUNTER_IRQn);
-}
\ No newline at end of file