Part Number: PROCESSOR-SDK-AM437X
Other Parts Discussed in Thread: AM4372
Tool/software: Linux
Team,
I am trying to toggle couple of GPIO on PRU0. I am using the latest SDK. Following are the configuration:
DTS:
AM4372_IOPAD(0x9d0, PIN_OUTPUT | MUX_MODE3) /* cam1_data8 mode 3 PRU*/
AM4372_IOPAD(0x9f0, PIN_OUTPUT | MUX_MODE4) /* cam1_data2 mode 4 PRU */
AM4372_IOPAD(0x9f4, PIN_OUTPUT | MUX_MODE4) /* cam1_data3 mode 4 PRU */
PRU0_1 Firmware:
#define HOST_INT ((uint32_t) 1 << 31)
#define OUT_S (1 << 0) /* (AD24) cam1_data8.pr0_pru1_gpo[0] */
#define OUT_D (1 << 11) /*AE22 (cam1_data3, pr0_pru1_gpo11, MOde 0x4)*/
#define OUT_C (1 << 10) /* AD21 (cam1_data2,pr0_pru1_gpo10, Mode 0x4)*/
#define PRU_OUT_SET(x) { __R30 |= (x); }
#define PRU_OUT_CLR(x) { __R30 &= ~(x); }
#define PRU_IN(x) (__R31 & (x))
#define TO_ARM_HOST 18
#define FROM_ARM_HOST 19
/*
* Using the name 'rpmsg-pru' will probe the rpmsg_pru driver found
* at linux-x.y.z/drivers/rpmsg/rpmsg_pru.c
*/
#define CHAN_NAME "rpmsg-pru"
#define CHAN_DESC "Channel 31"
#define CHAN_PORT 31
main (){
........
......
pru_rpmsg_init(&transport, &resourceTable.rpmsg_vring0, &resourceTable.rpmsg_vring1, TO_ARM_HOST, FROM_ARM_HOST);
/* Create the RPMsg channel between the PRU and ARM user space using the transport structure. */
while (pru_rpmsg_channel(RPMSG_NS_CREATE, &transport, CHAN_NAME, CHAN_DESC, CHAN_PORT) != PRU_RPMSG_SUCCESS);
while (1) {
/* Check bit 30 of register R31 to see if the ARM has kicked us */
if (__R31 & HOST_INT) {
/* Clear the event status */
CT_INTC.SICR_bit.STATUS_CLR_INDEX = FROM_ARM_HOST;
/* Receive all available messages, multiple messages can be sent per kick */
while (pru_rpmsg_receive(&transport, &src, &dst, payload, &len) == PRU_RPMSG_SUCCESS) {
/* Echo the message back to the same address from which we just received */
// pru_rpmsg_send(&transport, dst, src, payload, len);
for (i = 0 ; i < len ; i++){
if (payload[i] == 's' || payload[i] == 'S'){
PRU_OUT_SET(OUT_S);
pru_rpmsg_send(&transport, dst, src, payload, len);
}
else if (payload[i] == 'd' || payload[i] == 'D'){
PRU_OUT_SET(OUT_D);
pru_rpmsg_send(&transport, dst, src, payload, len);
}
else if (payload[i] == 'c' || payload[i] == 'C'){
PRU_OUT_SET(OUT_C);
pru_rpmsg_send(&transport, dst, src, payload, len);
}
}
}
resource configuration:
struct ch_map pru_intc_map[] = { {18, 3},
{19, 1},
};
struct my_resource_table resourceTable = {
......................
...........................
{
TYPE_CUSTOM, TYPE_PRU_INTS,
sizeof(struct fw_rsc_custom_ints),
{ /* PRU_INTS version */
0x0000,
/* Channel-to-host mapping, 255 for unused
* Mapping Channel-0 to Host-0 (PRU0/1 R31 bit 30)
*/
HOST_UNUSED, 1, HOST_UNUSED, 3, HOST_UNUSED,
HOST_UNUSED, HOST_UNUSED, HOST_UNUSED, HOST_UNUSED, HOST_UNUSED,
/* Number of evts being mapped to channels */
(sizeof(pru_intc_map) / sizeof(struct ch_map)),
/* Pointer to the structure containing mapped events */
pru_intc_map,
},
........
........
Trying to send commands s,c,d from the linux user space (via /dev/rpmsg_31). I am able to send each command (and can read it back as well in linux) but the lines are not getting toggled. Am I missing something ?
Best Regards,
Shiv
