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MCUXpresso: Enable usticker for LPC546XX and LPC54114 

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>
pull/7009/head
Mahesh Mahadevan 2018-05-15 22:17:58 -05:00 committed by Bartek Szatkowski
parent 4eb8841dc1
commit 659be61e4b
1 changed files with 39 additions and 16 deletions
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55
targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC/us_ticker.c
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@ -1,5 +1,5 @@
/* mbed Microcontroller Library
* Copyright (c) 2006-2013 ARM Limited
* Copyright (c) 2006-2018 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -18,37 +18,54 @@
#include "fsl_ctimer.h"
#include "PeripheralNames.h"
int us_ticker_inited = 0;
const ticker_info_t* us_ticker_get_info()
{
static const ticker_info_t info = {
1000000, // 1 MHz
32 // 32 bit counter
};
return &info;
}
static bool us_ticker_inited = false;
/** Initialize the high frequency ticker
*
*/
void us_ticker_init(void) {
ctimer_config_t config;
if (us_ticker_inited) {
return;
}
us_ticker_inited = 1;
uint32_t pclk = CLOCK_GetFreq(kCLOCK_BusClk);
uint32_t prescale = pclk / 1000000; // default to 1MHz (1 us ticks)
CTIMER_GetDefaultConfig(&config);
config.prescale = prescale - 1;
CTIMER_Init(CTIMER1, &config);
CTIMER_Reset(CTIMER1);
CTIMER_StartTimer(CTIMER1);
/* Let the timer to count if re-init. */
if (!us_ticker_inited) {
CTIMER_GetDefaultConfig(&config);
config.prescale = prescale - 1;
CTIMER_Init(CTIMER1, &config);
CTIMER_Reset(CTIMER1);
CTIMER_StartTimer(CTIMER1);
}
NVIC_SetVector(CTIMER1_IRQn, (uint32_t)us_ticker_irq_handler);
NVIC_EnableIRQ(CTIMER1_IRQn);
CTIMER1->MCR &= ~1;
us_ticker_inited = true;
}
/** Read the current counter
*
* @return The current timer's counter value in ticks
*/
uint32_t us_ticker_read(void) {
if (!us_ticker_inited)
us_ticker_init();
return CTIMER1->TC;
}
/** Set interrupt for specified timestamp
*
* @param timestamp The time in ticks when interrupt should be generated
*/
void us_ticker_set_interrupt(timestamp_t timestamp) {
ctimer_match_config_t matchConfig;
@ -62,10 +79,16 @@ void us_ticker_set_interrupt(timestamp_t timestamp) {
CTIMER_SetupMatch(CTIMER1, kCTIMER_Match_0, &matchConfig);
}
/** Disable us ticker interrupt
*
*/
void us_ticker_disable_interrupt(void) {
CTIMER1->MCR &= ~1;
}
/** Clear us ticker interrupt
*
*/
void us_ticker_clear_interrupt(void) {
CTIMER1->IR = 1;
}