pic24_timer.c File Reference

#include "pic24_timer.h"
#include "pic24_clockfreq.h"
#include "pic24_unittest.h"
#include "pic24_util.h"

Go to the source code of this file.

Functions
uint16_t	msToU16Ticks (uint16_t u16_ms, uint16_t u16_pre)
uint16_t	usToU16Ticks (uint16_t u16_us, uint16_t u16_pre)
uint32_t	usToU32Ticks (uint32_t u32_us, uint16_t u16_pre)
uint32_t	ticksToMs (uint32_t u32_ticks, uint16_t u16_tmrPre)
uint32_t	ticksToUs (uint32_t u32_ticks, uint16_t u16_tmrPre)
uint32_t	ticksToNs (uint32_t u32_ticks, uint16_t u16_tmrPre)
uint16_t	getTimerPrescaleBits (uint8_t u8_TCKPS)
uint32_t	computeDeltaTicksLong (uint16_t u16_start, uint16_t u16_end, uint16_t u16_tmrPR, uint16_t u16_oflows)
uint16_t	computeDeltaTicks (uint16_t u16_start, uint16_t u16_end, uint16_t u16_tmrPR)

Detailed Description

To do.

Definition in file pic24_timer.c.

Function Documentation

computeDeltaTicks()

uint16_t computeDeltaTicks	(	uint16_t	u16_start,
		uint16_t	u16_end,
		uint16_t	u16_tmrPR
	)

Computes delta ticks between two Timer register captures Assumes the delta time does not exceeds the timer period

Parameters

u16_start	start tick
u16_end	end tick
u16_tmrPR	Timer period register

Returns

delta ticks

Definition at line 193 of file pic24_timer.c.

computeDeltaTicksLong()

uint32_t computeDeltaTicksLong	(	uint16_t	u16_start,
		uint16_t	u16_end,
		uint16_t	u16_tmrPR,
		uint16_t	u16_oflows
	)

Computes delta ticks between two Timer register captures Assumes long time interval and thus has a parameter for tracking timer overflows

Parameters

u16_start	start tick
u16_end	end tick
u16_tmrPR	Timer period register
u16_oflows	number of timer overflows

Returns

delta ticks

Definition at line 172 of file pic24_timer.c.

getTimerPrescaleBits()

uint16_t getTimerPrescaleBits

(

uint8_t

u8_TCKPS

)

Given the TCKPS bitfield, return the timer prescale encoded by these bits. Use getTimerPrescale as a convenient way to extract the TCKPS bitfield from a TxCONbits SFT then call this function.

Parameters

u8_TCKPS

TCKPS bitfield from the timer in question

Returns

Prescale value.

Definition at line 158 of file pic24_timer.c.

msToU16Ticks()

uint16_t msToU16Ticks	(	uint16_t	u16_ms,
		uint16_t	u16_pre
	)

Converts milliseconds to 16-bit timer ticks.

Parameters

u16_ms	Time, in milliseconds, to convert to ticks
u16_pre	Prescale set for this timer. Note that getTimerPrescale can easily determine this.

Returns

Timer ticks corresponding to the given number of milliseconds.

Definition at line 53 of file pic24_timer.c.

ticksToMs()

uint32_t ticksToMs	(	uint32_t	u32_ticks,
		uint16_t	u16_tmrPre
	)

Converts timer ticks to milliseconds

Parameters

u32_ticks	Timer ticks
u16_tmrPre	Timer prescale value

Returns

time in milliseconds

Definition at line 106 of file pic24_timer.c.

ticksToNs()

uint32_t ticksToNs	(	uint32_t	u32_ticks,
		uint16_t	u16_tmrPre
	)

Converts timer ticks to nanoseconds

Parameters

u32_ticks	Timer ticks
u16_tmrPre	Timer prescale value

Returns

time in nanoseconds

Definition at line 139 of file pic24_timer.c.

ticksToUs()

uint32_t ticksToUs	(	uint32_t	u32_ticks,
		uint16_t	u16_tmrPre
	)

Converts timer ticks to microseconds

Parameters

u32_ticks	Timer ticks
u16_tmrPre	Timer prescale value

Returns

time in microseconds

Definition at line 123 of file pic24_timer.c.

usToU16Ticks()

uint16_t usToU16Ticks	(	uint16_t	u16_us,
		uint16_t	u16_pre
	)

Converts microseconds to 16-bit timer ticks.

Parameters

u16_us	Time, in microseconds, to convert to ticks
u16_pre	Prescale set for this timer. Note that getTimerPrescale can easily determine this.

Returns

Timer ticks corresponding to the given number of microseconds.

Definition at line 71 of file pic24_timer.c.

usToU32Ticks()

uint32_t usToU32Ticks	(	uint32_t	u32_us,
		uint16_t	u16_pre
	)

Converts microseconds to 32-bit timer ticks.

Parameters

u32_us	Time, in microseconds, to convert to ticks
u16_pre	Prescale set for this timer. Note that getTimerPrescale can easily determine this.

Returns

Timer ticks corresponding to the given number of microseconds.

Definition at line 90 of file pic24_timer.c.