blob: 10839c95eee32db9d7565b6d6cb7a027727a5a32 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
/**
* @brief
*/
#ifndef _DELAY_H_
#define _DELAY_H_
static inline void delay_us(uint32 us) {
/* So (2^32)/12 micros max, or less than 6 minutes */
us *= 12;
/* fudge for function call overhead */
us--;
asm volatile(" mov r0, %[us] \n\t"
"1: subs r0, #1 \n\t"
" bhi 1b \n\t"
:
: [us] "r" (us)
: "r0");
}
#endif
|
