i'm using pru0
/* host c code */
#include <stdio.h>
#include <stdlib.h>
#include <prussdrv.h>
#include <pruss_intc_mapping.h>
#define PRU_NUM 0
#define AM33XX
int main (int argc, char **argv)
{
unsigned int ret;
tpruss_intc_initdata pruss_intc_initdata = PRUSS_INTC_INITDATA;
/* Initialize the PRU */
prussdrv_init ();
/* Open PRU Interrupt */
ret = prussdrv_open(PRU_EVTOUT_0);
if (ret) {
printf("prussdrv_open open failed\n");
return (ret);
}
prussdrv_map_prumem (PRUSS0_SHARED_DATARAM, &prudata);
/* some macros from prussdrv.h
#define PRUSS0_PRU0_DATARAM 0
#define PRUSS0_PRU1_DATARAM 1
#define PRUSS0_PRU0_IRAM 2
#define PRUSS0_PRU1_IRAM 3
#define PRUSS0_SHARED_DATARAM 4 */
pru0data_int = (unsigned int *) prudata; /* (pru0data_int) memory
location to send data to pru0 from host code */
*(pru0data_int) = 1;
/* Get the interrupt initialized */
prussdrv_pruintc_init(&pruss_intc_initdata);
/* Execute example on PRU */
prussdrv_exec_program (PRU_NUM, "./text.bin");
/* Wait until PRU0 has finished execution */
prussdrv_pru_wait_event (PRU_EVTOUT_0);
prussdrv_pru_clear_event (PRU_EVTOUT_0, PRU0_ARM_INTERRUPT);
/* Disable PRU and close memory mapping*/
prussdrv_pru_disable (PRU_NUM);
prussdrv_exit ();
return(0);
}
/* pru code */
.origin 0
.entrypoint START
#define PRU_EVTOUT_0 3
//#define USER_DELAY 50
START:
MOV r0, 0x00000000
LBBO r4, r0, 0, 4 /* read data from host code */
/* do some more stuff */
END:
MOV r31.b0, 35
HALT
On Monday, 15 June 2015 19:53:51 UTC+5:30, Pat H. wrote:
>
> Hello everyone,
>
> I am a newbie when it concerns embedded Linux/BBB and I've been having
> some difficulties about shared memory access.
> Using the main processor, I could perfectly read/write data into shared
> memory (I want to share them with the PRUs).
>
> And when it comes to PRU, I cannot access shmemory (maybe my code to map
> the registers is not working - I am coding in C).
> Has anyone tried to write and read shared memory in PRU code?
>
>
> Thanks!
>
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