Diff: targets/hal/TARGET_Freescale/TARGET_KL05Z/us_ticker.c

Revision:

82:0b31dbcd4769

Parent:

81:a9456fdf72fa

Child:

83:5a6f638110fe

--- a/targets/hal/TARGET_Freescale/TARGET_KL05Z/us_ticker.c	Fri Jan 31 09:00:05 2014 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,134 +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 "PeripheralNames.h"
-
-/* Prototypes */
-static void pit_init(void);
-static void lptmr_init(void);
-static void lptmr_isr(void);
-
-/* Global variables */
-static uint32_t us_ticker_inited = 0;
-static uint32_t us_ticker_int_counter = 0;
-static uint16_t us_ticker_int_remainder = 0;
-
-
-void us_ticker_init(void) {
-    if (us_ticker_inited) {
-        return;
-    }
-    us_ticker_inited = 1;
-
-    pit_init();
-    lptmr_init();
-}
-
-static void pit_init(void) {
-    SIM->SCGC6 |= SIM_SCGC6_PIT_MASK;   // Clock PIT
-    PIT->MCR = 0;                       // Enable PIT
-
-    // Channel 1
-    PIT->CHANNEL[1].LDVAL = 0xFFFFFFFF;
-    PIT->CHANNEL[1].TCTRL = PIT_TCTRL_CHN_MASK;    // Chain to timer 0, disable Interrupts
-    PIT->CHANNEL[1].TCTRL |= PIT_TCTRL_TEN_MASK;   // Start timer 1
-
-    // Use channel 0 as a prescaler for channel 1
-    PIT->CHANNEL[0].LDVAL = 23;
-    PIT->CHANNEL[0].TCTRL = PIT_TCTRL_TEN_MASK;    // Start timer 0, disable interrupts
-}
-
-uint32_t us_ticker_read() {
-    if (!us_ticker_inited) {
-        us_ticker_init();
-    }
-
-    // The PIT is a countdown timer
-    return ~(PIT->CHANNEL[1].CVAL);
-}
-
-static void lptmr_init(void) {
-    SIM->SCGC5 |= SIM_SCGC5_LPTMR_MASK;
-
-    LPTMR0->CSR = 0;
-
-    NVIC_SetVector(LPTimer_IRQn, (uint32_t)lptmr_isr);
-    NVIC_EnableIRQ(LPTimer_IRQn);
-
-    // Clock at (1)MHz -> (1)tick/us
-    LPTMR0->PSR = LPTMR_PSR_PCS(0);       // MCGIRCLK -> 2MHz / presc 2 = 1MHz
-}
-
-void us_ticker_disable_interrupt(void) {
-    LPTMR0->CSR &= ~LPTMR_CSR_TIE_MASK;
-}
-
-void us_ticker_clear_interrupt(void) {
-    // we've  already cleared interrupt in lptmr_isr
-}
-
-static void lptmr_set(unsigned short count) {
-    // Reset
-    LPTMR0->CSR = 0;
-
-    // Set the compare register
-    LPTMR0->CMR = count;
-
-    // Enable interrupt
-    LPTMR0->CSR |= LPTMR_CSR_TIE_MASK;
-
-    // Start the timer
-    LPTMR0->CSR |= LPTMR_CSR_TEN_MASK;
-}
-
-static void lptmr_isr(void) {
-    // write 1 to TCF to clear the LPT timer compare flag
-    LPTMR0->CSR |= LPTMR_CSR_TCF_MASK;
-
-    if (us_ticker_int_counter > 0) {
-        lptmr_set(0xFFFF);
-        us_ticker_int_counter--;
-    } else {
-        if (us_ticker_int_remainder > 0) {
-            lptmr_set(us_ticker_int_remainder);
-            us_ticker_int_remainder = 0;
-        } else {
-            // This function is going to disable the interrupts if there are
-            // no other events in the queue
-            us_ticker_irq_handler();
-        }
-    }
-}
-
-void us_ticker_set_interrupt(unsigned int timestamp) {
-    int32_t delta = (int32_t)(timestamp - us_ticker_read());
-    if (delta <= 0) {
-        // This event was in the past:
-        us_ticker_irq_handler();
-        return;
-    }
-
-    us_ticker_int_counter   = (uint32_t)(delta >> 16);
-    us_ticker_int_remainder = (uint16_t)(0xFFFF & delta);
-    if (us_ticker_int_counter > 0) {
-        lptmr_set(0xFFFF);
-        us_ticker_int_counter--;
-    } else {
-        lptmr_set(us_ticker_int_remainder);
-        us_ticker_int_remainder = 0;
-    }
-}