577 lines
17 KiB
C
577 lines
17 KiB
C
/*****************************************************************************
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* Copyright 2003 - 2008 Broadcom Corporation. All rights reserved.
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*
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* Unless you and Broadcom execute a separate written software license
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* agreement governing use of this software, this software is licensed to you
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* under the terms of the GNU General Public License version 2, available at
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* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
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*
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* Notwithstanding the above, under no circumstances may you combine this
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* software in any way with any other Broadcom software provided under a
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* license other than the GPL, without Broadcom's express prior written
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* consent.
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*****************************************************************************/
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/****************************************************************************/
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/**
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* @file tmrHw.c
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*
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* @brief Low level Timer driver routines
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*
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* @note
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*
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* These routines provide basic timer functionality only.
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*/
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/****************************************************************************/
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/* ---- Include Files ---------------------------------------------------- */
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#include <csp/errno.h>
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#include <csp/stdint.h>
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#include <csp/tmrHw.h>
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#include <mach/csp/tmrHw_reg.h>
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#define tmrHw_ASSERT(a) if (!(a)) *(char *)0 = 0
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#define tmrHw_MILLISEC_PER_SEC (1000)
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#define tmrHw_LOW_1_RESOLUTION_COUNT (tmrHw_LOW_RESOLUTION_CLOCK / tmrHw_MILLISEC_PER_SEC)
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#define tmrHw_LOW_1_MAX_MILLISEC (0xFFFFFFFF / tmrHw_LOW_1_RESOLUTION_COUNT)
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#define tmrHw_LOW_16_RESOLUTION_COUNT (tmrHw_LOW_1_RESOLUTION_COUNT / 16)
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#define tmrHw_LOW_16_MAX_MILLISEC (0xFFFFFFFF / tmrHw_LOW_16_RESOLUTION_COUNT)
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#define tmrHw_LOW_256_RESOLUTION_COUNT (tmrHw_LOW_1_RESOLUTION_COUNT / 256)
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#define tmrHw_LOW_256_MAX_MILLISEC (0xFFFFFFFF / tmrHw_LOW_256_RESOLUTION_COUNT)
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#define tmrHw_HIGH_1_RESOLUTION_COUNT (tmrHw_HIGH_RESOLUTION_CLOCK / tmrHw_MILLISEC_PER_SEC)
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#define tmrHw_HIGH_1_MAX_MILLISEC (0xFFFFFFFF / tmrHw_HIGH_1_RESOLUTION_COUNT)
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#define tmrHw_HIGH_16_RESOLUTION_COUNT (tmrHw_HIGH_1_RESOLUTION_COUNT / 16)
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#define tmrHw_HIGH_16_MAX_MILLISEC (0xFFFFFFFF / tmrHw_HIGH_16_RESOLUTION_COUNT)
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#define tmrHw_HIGH_256_RESOLUTION_COUNT (tmrHw_HIGH_1_RESOLUTION_COUNT / 256)
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#define tmrHw_HIGH_256_MAX_MILLISEC (0xFFFFFFFF / tmrHw_HIGH_256_RESOLUTION_COUNT)
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static void ResetTimer(tmrHw_ID_t timerId)
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__attribute__ ((section(".aramtext")));
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static int tmrHw_divide(int num, int denom)
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__attribute__ ((section(".aramtext")));
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/****************************************************************************/
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/**
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* @brief Get timer capability
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*
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* This function returns various capabilities/attributes of a timer
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*
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* @return Capability
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*
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*/
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/****************************************************************************/
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uint32_t tmrHw_getTimerCapability(tmrHw_ID_t timerId, /* [ IN ] Timer Id */
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tmrHw_CAPABILITY_e capability /* [ IN ] Timer capability */
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) {
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switch (capability) {
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case tmrHw_CAPABILITY_CLOCK:
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return (timerId <=
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1) ? tmrHw_LOW_RESOLUTION_CLOCK :
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tmrHw_HIGH_RESOLUTION_CLOCK;
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case tmrHw_CAPABILITY_RESOLUTION:
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return 32;
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default:
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return 0;
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}
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return 0;
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}
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/****************************************************************************/
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/**
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* @brief Resets a timer
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*
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* This function initializes timer
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*
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* @return void
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*
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*/
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/****************************************************************************/
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static void ResetTimer(tmrHw_ID_t timerId /* [ IN ] Timer Id */
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) {
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/* Reset timer */
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pTmrHw[timerId].LoadValue = 0;
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pTmrHw[timerId].CurrentValue = 0xFFFFFFFF;
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pTmrHw[timerId].Control = 0;
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pTmrHw[timerId].BackgroundLoad = 0;
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/* Always configure as a 32 bit timer */
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pTmrHw[timerId].Control |= tmrHw_CONTROL_32BIT;
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/* Clear interrupt only if raw status interrupt is set */
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if (pTmrHw[timerId].RawInterruptStatus) {
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pTmrHw[timerId].InterruptClear = 0xFFFFFFFF;
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}
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}
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/****************************************************************************/
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/**
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* @brief Sets counter value for an interval in ms
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*
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* @return On success: Effective counter value set
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* On failure: 0
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*
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*/
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/****************************************************************************/
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static tmrHw_INTERVAL_t SetTimerPeriod(tmrHw_ID_t timerId, /* [ IN ] Timer Id */
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tmrHw_INTERVAL_t msec /* [ IN ] Interval in milli-second */
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) {
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uint32_t scale = 0;
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uint32_t count = 0;
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if (timerId == 0 || timerId == 1) {
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if (msec <= tmrHw_LOW_1_MAX_MILLISEC) {
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PRESCALE_1;
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scale = tmrHw_LOW_1_RESOLUTION_COUNT;
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} else if (msec <= tmrHw_LOW_16_MAX_MILLISEC) {
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PRESCALE_16;
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scale = tmrHw_LOW_16_RESOLUTION_COUNT;
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} else if (msec <= tmrHw_LOW_256_MAX_MILLISEC) {
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PRESCALE_256;
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scale = tmrHw_LOW_256_RESOLUTION_COUNT;
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} else {
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return 0;
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}
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count = msec * scale;
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/* Set counter value */
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pTmrHw[timerId].LoadValue = count;
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pTmrHw[timerId].BackgroundLoad = count;
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} else if (timerId == 2 || timerId == 3) {
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if (msec <= tmrHw_HIGH_1_MAX_MILLISEC) {
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PRESCALE_1;
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scale = tmrHw_HIGH_1_RESOLUTION_COUNT;
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} else if (msec <= tmrHw_HIGH_16_MAX_MILLISEC) {
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PRESCALE_16;
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scale = tmrHw_HIGH_16_RESOLUTION_COUNT;
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} else if (msec <= tmrHw_HIGH_256_MAX_MILLISEC) {
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PRESCALE_256;
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scale = tmrHw_HIGH_256_RESOLUTION_COUNT;
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} else {
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return 0;
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}
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count = msec * scale;
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/* Set counter value */
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pTmrHw[timerId].LoadValue = count;
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pTmrHw[timerId].BackgroundLoad = count;
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}
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return count / scale;
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}
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/****************************************************************************/
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/**
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* @brief Configures a periodic timer in terms of timer interrupt rate
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*
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* This function initializes a periodic timer to generate specific number of
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* timer interrupt per second
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*
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* @return On success: Effective timer frequency
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* On failure: 0
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*
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*/
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/****************************************************************************/
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tmrHw_RATE_t tmrHw_setPeriodicTimerRate(tmrHw_ID_t timerId, /* [ IN ] Timer Id */
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tmrHw_RATE_t rate /* [ IN ] Number of timer interrupt per second */
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) {
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uint32_t resolution = 0;
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uint32_t count = 0;
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ResetTimer(timerId);
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/* Set timer mode periodic */
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PERIODIC;
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pTmrHw[timerId].Control &= ~tmrHw_CONTROL_ONESHOT;
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/* Set timer in highest resolution */
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PRESCALE_1;
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if (rate && (timerId == 0 || timerId == 1)) {
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if (rate > tmrHw_LOW_RESOLUTION_CLOCK) {
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return 0;
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}
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resolution = tmrHw_LOW_RESOLUTION_CLOCK;
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} else if (rate && (timerId == 2 || timerId == 3)) {
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if (rate > tmrHw_HIGH_RESOLUTION_CLOCK) {
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return 0;
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} else {
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resolution = tmrHw_HIGH_RESOLUTION_CLOCK;
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}
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} else {
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return 0;
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}
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/* Find the counter value */
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count = resolution / rate;
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/* Set counter value */
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pTmrHw[timerId].LoadValue = count;
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pTmrHw[timerId].BackgroundLoad = count;
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return resolution / count;
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}
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/****************************************************************************/
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/**
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* @brief Configures a periodic timer to generate timer interrupt after
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* certain time interval
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*
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* This function initializes a periodic timer to generate timer interrupt
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* after every time interval in millisecond
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*
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* @return On success: Effective interval set in milli-second
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* On failure: 0
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*
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*/
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/****************************************************************************/
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tmrHw_INTERVAL_t tmrHw_setPeriodicTimerInterval(tmrHw_ID_t timerId, /* [ IN ] Timer Id */
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tmrHw_INTERVAL_t msec /* [ IN ] Interval in milli-second */
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) {
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ResetTimer(timerId);
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/* Set timer mode periodic */
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PERIODIC;
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pTmrHw[timerId].Control &= ~tmrHw_CONTROL_ONESHOT;
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return SetTimerPeriod(timerId, msec);
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}
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/****************************************************************************/
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/**
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* @brief Configures a periodic timer to generate timer interrupt just once
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* after certain time interval
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*
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* This function initializes a periodic timer to generate a single ticks after
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* certain time interval in millisecond
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*
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* @return On success: Effective interval set in milli-second
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* On failure: 0
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*
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*/
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/****************************************************************************/
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tmrHw_INTERVAL_t tmrHw_setOneshotTimerInterval(tmrHw_ID_t timerId, /* [ IN ] Timer Id */
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tmrHw_INTERVAL_t msec /* [ IN ] Interval in milli-second */
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) {
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ResetTimer(timerId);
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/* Set timer mode oneshot */
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PERIODIC;
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pTmrHw[timerId].Control |= tmrHw_CONTROL_ONESHOT;
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return SetTimerPeriod(timerId, msec);
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}
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/****************************************************************************/
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/**
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* @brief Configures a timer to run as a free running timer
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*
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* This function initializes a timer to run as a free running timer
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*
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* @return Timer resolution (count / sec)
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*
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*/
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/****************************************************************************/
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tmrHw_RATE_t tmrHw_setFreeRunningTimer(tmrHw_ID_t timerId, /* [ IN ] Timer Id */
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uint32_t divider /* [ IN ] Dividing the clock frequency */
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) {
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uint32_t scale = 0;
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ResetTimer(timerId);
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/* Set timer as free running mode */
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pTmrHw[timerId].Control &= ~tmrHw_CONTROL_PERIODIC;
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pTmrHw[timerId].Control &= ~tmrHw_CONTROL_ONESHOT;
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if (divider >= 64) {
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PRESCALE_256;
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scale = 256;
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} else if (divider >= 8) {
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PRESCALE_16;
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scale = 16;
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} else {
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pTmrHw[timerId].Control |= tmrHw_CONTROL_PRESCALE_1;
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scale = 1;
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}
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if (timerId == 0 || timerId == 1) {
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return tmrHw_divide(tmrHw_LOW_RESOLUTION_CLOCK, scale);
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} else if (timerId == 2 || timerId == 3) {
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return tmrHw_divide(tmrHw_HIGH_RESOLUTION_CLOCK, scale);
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}
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return 0;
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}
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/****************************************************************************/
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/**
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* @brief Starts a timer
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*
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* This function starts a preconfigured timer
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*
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* @return -1 - On Failure
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* 0 - On Success
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*
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*/
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/****************************************************************************/
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int tmrHw_startTimer(tmrHw_ID_t timerId /* [ IN ] Timer id */
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) {
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pTmrHw[timerId].Control |= tmrHw_CONTROL_TIMER_ENABLE;
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return 0;
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}
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/****************************************************************************/
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/**
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* @brief Stops a timer
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*
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* This function stops a running timer
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*
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* @return -1 - On Failure
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* 0 - On Success
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*
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*/
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/****************************************************************************/
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int tmrHw_stopTimer(tmrHw_ID_t timerId /* [ IN ] Timer id */
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) {
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pTmrHw[timerId].Control &= ~tmrHw_CONTROL_TIMER_ENABLE;
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return 0;
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}
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/****************************************************************************/
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/**
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* @brief Gets current timer count
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*
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* This function returns the current timer value
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*
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* @return Current downcounting timer value
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*
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*/
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/****************************************************************************/
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uint32_t tmrHw_GetCurrentCount(tmrHw_ID_t timerId /* [ IN ] Timer id */
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) {
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/* return 32 bit timer value */
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switch (pTmrHw[timerId].Control & tmrHw_CONTROL_MODE_MASK) {
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case tmrHw_CONTROL_FREE_RUNNING:
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if (pTmrHw[timerId].CurrentValue) {
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return tmrHw_MAX_COUNT - pTmrHw[timerId].CurrentValue;
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}
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break;
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case tmrHw_CONTROL_PERIODIC:
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case tmrHw_CONTROL_ONESHOT:
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return pTmrHw[timerId].BackgroundLoad -
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pTmrHw[timerId].CurrentValue;
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}
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return 0;
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}
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/****************************************************************************/
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/**
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* @brief Gets timer count rate
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*
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* This function returns the number of counts per second
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*
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* @return Count rate
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*
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*/
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/****************************************************************************/
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tmrHw_RATE_t tmrHw_getCountRate(tmrHw_ID_t timerId /* [ IN ] Timer id */
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) {
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uint32_t divider = 0;
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switch (pTmrHw[timerId].Control & tmrHw_CONTROL_PRESCALE_MASK) {
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case tmrHw_CONTROL_PRESCALE_1:
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divider = 1;
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break;
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case tmrHw_CONTROL_PRESCALE_16:
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divider = 16;
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break;
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case tmrHw_CONTROL_PRESCALE_256:
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divider = 256;
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break;
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default:
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tmrHw_ASSERT(0);
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}
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if (timerId == 0 || timerId == 1) {
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return tmrHw_divide(tmrHw_LOW_RESOLUTION_CLOCK, divider);
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} else {
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return tmrHw_divide(tmrHw_HIGH_RESOLUTION_CLOCK, divider);
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}
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return 0;
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}
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/****************************************************************************/
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/**
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* @brief Enables timer interrupt
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*
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* This function enables the timer interrupt
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*
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* @return N/A
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*
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*/
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/****************************************************************************/
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void tmrHw_enableInterrupt(tmrHw_ID_t timerId /* [ IN ] Timer id */
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) {
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pTmrHw[timerId].Control |= tmrHw_CONTROL_INTERRUPT_ENABLE;
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}
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/****************************************************************************/
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/**
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* @brief Disables timer interrupt
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*
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* This function disable the timer interrupt
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*
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* @return N/A
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*
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*/
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/****************************************************************************/
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void tmrHw_disableInterrupt(tmrHw_ID_t timerId /* [ IN ] Timer id */
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) {
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pTmrHw[timerId].Control &= ~tmrHw_CONTROL_INTERRUPT_ENABLE;
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}
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/****************************************************************************/
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/**
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* @brief Clears the interrupt
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*
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* This function clears the timer interrupt
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*
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* @return N/A
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*
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* @note
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* Must be called under the context of ISR
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*/
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/****************************************************************************/
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void tmrHw_clearInterrupt(tmrHw_ID_t timerId /* [ IN ] Timer id */
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) {
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pTmrHw[timerId].InterruptClear = 0x1;
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}
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/****************************************************************************/
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/**
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* @brief Gets the interrupt status
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*
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* This function returns timer interrupt status
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*
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* @return Interrupt status
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*/
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/****************************************************************************/
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tmrHw_INTERRUPT_STATUS_e tmrHw_getInterruptStatus(tmrHw_ID_t timerId /* [ IN ] Timer id */
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) {
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if (pTmrHw[timerId].InterruptStatus) {
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return tmrHw_INTERRUPT_STATUS_SET;
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} else {
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return tmrHw_INTERRUPT_STATUS_UNSET;
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}
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}
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/****************************************************************************/
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/**
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* @brief Indentifies a timer causing interrupt
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*
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* This functions returns a timer causing interrupt
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*
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* @return 0xFFFFFFFF : No timer causing an interrupt
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* ! 0xFFFFFFFF : timer causing an interrupt
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* @note
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* tmrHw_clearIntrrupt() must be called with a valid timer id after calling this function
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*/
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/****************************************************************************/
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tmrHw_ID_t tmrHw_getInterruptSource(void /* void */
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) {
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int i;
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for (i = 0; i < tmrHw_TIMER_NUM_COUNT; i++) {
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if (pTmrHw[i].InterruptStatus) {
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return i;
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}
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}
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return 0xFFFFFFFF;
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}
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/****************************************************************************/
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/**
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* @brief Displays specific timer registers
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*
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*
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* @return void
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*
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*/
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/****************************************************************************/
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void tmrHw_printDebugInfo(tmrHw_ID_t timerId, /* [ IN ] Timer id */
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int (*fpPrint) (const char *, ...) /* [ IN ] Print callback function */
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) {
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(*fpPrint) ("Displaying register contents \n\n");
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(*fpPrint) ("Timer %d: Load value 0x%X\n", timerId,
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pTmrHw[timerId].LoadValue);
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(*fpPrint) ("Timer %d: Background load value 0x%X\n", timerId,
|
|
pTmrHw[timerId].BackgroundLoad);
|
|
(*fpPrint) ("Timer %d: Control 0x%X\n", timerId,
|
|
pTmrHw[timerId].Control);
|
|
(*fpPrint) ("Timer %d: Interrupt clear 0x%X\n", timerId,
|
|
pTmrHw[timerId].InterruptClear);
|
|
(*fpPrint) ("Timer %d: Interrupt raw interrupt 0x%X\n", timerId,
|
|
pTmrHw[timerId].RawInterruptStatus);
|
|
(*fpPrint) ("Timer %d: Interrupt status 0x%X\n", timerId,
|
|
pTmrHw[timerId].InterruptStatus);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
/**
|
|
* @brief Use a timer to perform a busy wait delay for a number of usecs.
|
|
*
|
|
* @return N/A
|
|
*/
|
|
/****************************************************************************/
|
|
void tmrHw_udelay(tmrHw_ID_t timerId, /* [ IN ] Timer id */
|
|
unsigned long usecs /* [ IN ] usec to delay */
|
|
) {
|
|
tmrHw_RATE_t usec_tick_rate;
|
|
tmrHw_COUNT_t start_time;
|
|
tmrHw_COUNT_t delta_time;
|
|
|
|
start_time = tmrHw_GetCurrentCount(timerId);
|
|
usec_tick_rate = tmrHw_divide(tmrHw_getCountRate(timerId), 1000000);
|
|
delta_time = usecs * usec_tick_rate;
|
|
|
|
/* Busy wait */
|
|
while (delta_time > (tmrHw_GetCurrentCount(timerId) - start_time))
|
|
;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
/**
|
|
* @brief Local Divide function
|
|
*
|
|
* This function does the divide
|
|
*
|
|
* @return divide value
|
|
*
|
|
*/
|
|
/****************************************************************************/
|
|
static int tmrHw_divide(int num, int denom)
|
|
{
|
|
int r;
|
|
int t = 1;
|
|
|
|
/* Shift denom and t up to the largest value to optimize algorithm */
|
|
/* t contains the units of each divide */
|
|
while ((denom & 0x40000000) == 0) { /* fails if denom=0 */
|
|
denom = denom << 1;
|
|
t = t << 1;
|
|
}
|
|
|
|
/* Intialize the result */
|
|
r = 0;
|
|
|
|
do {
|
|
/* Determine if there exists a positive remainder */
|
|
if ((num - denom) >= 0) {
|
|
/* Accumlate t to the result and calculate a new remainder */
|
|
num = num - denom;
|
|
r = r + t;
|
|
}
|
|
/* Continue to shift denom and shift t down to 0 */
|
|
denom = denom >> 1;
|
|
t = t >> 1;
|
|
} while (t != 0);
|
|
return r;
|
|
}
|