lpc_timers.h File Reference

#include <stdint.h>
#include "LPC17xx.h"

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Enumerations
enum	lpc_timer_t { lpc_timer0, lpc_timer1, lpc_timer2, lpc_timer3 }

Functions
void	lpc_timer_enable (const lpc_timer_t timer, const uint32_t us_per_tick)
uint32_t	lpc_timer_get_value (const lpc_timer_t timer)
void	lpc_timer_set_value (const lpc_timer_t timer, const uint32_t value)

Detailed Description

This API provides a means to start a simple timer, and get/set the timer value 20140610: Initial

Enumeration Type Documentation

enum lpc_timer_t

The type of timers supported by LPC17xx Note that for the SJ-One project, lpc_timer1 is being used by lpc_sys.c to carry out several background services and capture IR receiver signals.

Enumerator
lpc_timer0
lpc_timer1
lpc_timer2
lpc_timer3

Function Documentation

void lpc_timer_enable	(	const lpc_timer_t	timer,
		const uint32_t	us_per_tick
	)

Enables and starts the timer with the given tick rate

Parameters

[in]	timer	The timer type
[in]	us_per_tick	The resolution of each tick

Note

The logic requires the CPU to be running at greater than or equal to 1Mhz

Postcondition

The timer's clock divider is set to (CPU clock)/1

uint32_t lpc_timer_get_value

(

const lpc_timer_t

timer

)

Get the value of the timer

Parameters

[in]

timer

The timer type

Returns

The value of the timer

void lpc_timer_set_value	(	const lpc_timer_t	timer,
		const uint32_t	value
	)

Set the value of the timer; you normally shouldn't do this as the hardware is ticking the timer in the background but you can use it to reset it to zero.

Parameters

[in]	timer	The timer type
[in]	value	The value to set.