blob: ad73aeda3ca73e312d4b3128efb506f2a43ffb48 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/**
* @file
* @brief RTL22xx board Timer driver
*
* This uses Timer1 for timing measurments.
*/
/*
* By Ray Xu <rayx.cn@gmail.com>, modify form Mc9328mxl RTEMS DSP
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <bsp.h>
#include <rtems.h>
#include <rtems/btimer.h>
#include <lpc22xx.h>
#include "lpc_timer.h"
uint32_t g_start;
uint32_t g_freq;
bool benchmark_timer_find_average_overhead;
/*
* Set up Timer 1
*/
void benchmark_timer_initialize( void )
{
g_freq = LPC22xx_Fpclk / 1000;
}
/*
* The following controls the behavior of benchmark_timer_read().
*
* AVG_OVEREHAD is the overhead for starting and stopping the timer. It
* is usually deducted from the number returned.
*
* LEAST_VALID is the lowest number this routine should trust. Numbers
* below this are "noise" and zero is returned.
*/
#define AVG_OVERHEAD 0 /* It typically takes X.X microseconds */
/* (Y countdowns) to start/stop the timer. */
/* This value is in microseconds. */
#define LEAST_VALID 1 /* Don't trust a clicks value lower than this */
benchmark_timer_t benchmark_timer_read( void )
{
return (T0TC/(LPC22xx_Fpclk/1000000));
/*
* Total is calculated by taking into account the number of timer overflow
* interrupts since the timer was initialized and clicks since the last
* interrupts.
*/
}
void benchmark_timer_disable_subtracting_average_overhead(bool find_flag)
{
benchmark_timer_find_average_overhead = find_flag;
}
|
