File size: 1,237 Bytes
8be366a | 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 | /*
* Userspace c library Example to measure delay between two 4 byte writes but this time includes cycles taken to calculate the delay
*
* Copyright (C) 2015 Apaar Gupta
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include "pru_bridge.h"
#include "pru_defs.h"
static inline u32 read_PIEP_COUNT(void)
{
return PIEP_COUNT;
}
int main()
{
/* configure timer */
PIEP_GLOBAL_CFG = GLOBAL_CFG_CNT_ENABLE |
GLOBAL_CFG_DEFAULT_INC(1) |
GLOBAL_CFG_CMP_INC(1);
PIEP_CMP_STATUS = CMD_STATUS_CMP_HIT(1);
PIEP_CMP_CFG |= CMP_CFG_CMP_EN(1);
int current = 0,last = 0,delay = 0;
while(check_init() != 1);
uint8_t check_flag = 0; //getting the pru to wait until we are ready to read
while(check_flag == 0)
{
read_buffer(1,&check_flag,1);
}
while(1)
{
//if(check_index(0)) //checking if the buffer is full or not
//{
current = read_PIEP_COUNT();
delay = current - last;
write_buffer(0,(uint8_t*)(&delay),4);
last = current;
//}
}
return 0;
}
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