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Add print_freq() to display frequencies nicely

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Add a function similar to print_size() that works for frequencies. It can
handle from Hz to GHz.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2015-04-29 07:56:43 -06:00
parent 2ea09c836f
commit 33eac2dc25
2 changed files with 53 additions and 0 deletions
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11
include/display_options.h
View file

@ -22,6 +22,17 @@
*/
void print_size(uint64_t size, const char *suffix);
/**
* print_freq() - Print a frequency with a suffix
*
* Print frequencies as "x.xx GHz", "xxx KHz", etc as needed; allow for
* optional trailing string (like "\n")
*
* @freq: Frequency to print in Hz
* @suffix String to print after the frequency
*/
void print_freq(uint64_t freq, const char *suffix);
/**
* print_buffer() - Print data buffer in hex and ascii form
*

42
lib/display_options.c
View file

@ -7,6 +7,7 @@
#include <config.h>
#include <common.h>
#include <div64.h>
#include <inttypes.h>
#include <version.h>
#include <linux/ctype.h>
@ -22,6 +23,47 @@ int display_options (void)
return 0;
}
void print_freq(uint64_t freq, const char *s)
{
unsigned long m = 0, n;
uint32_t f;
static const char names[] = {'G', 'M', 'K'};
unsigned long d = 1e9;
char c = 0;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(names); i++, d /= 1000) {
if (freq >= d) {
c = names[i];
break;
}
}
if (!c) {
printf("%" PRIu64 " Hz%s", freq, s);
return;
}
f = do_div(freq, d);
n = freq;
/* If there's a remainder, show the first few digits */
if (f) {
m = f;
while (m > 1000)
m /= 10;
while (m && !(m % 10))
m /= 10;
if (m >= 100)
m = (m / 10) + (m % 100 >= 50);
}
printf("%lu", n);
if (m)
printf(".%ld", m);
printf(" %cHz%s", c, s);
}
void print_size(uint64_t size, const char *s)
{
unsigned long m = 0, n;