/*
* main.c
*/
void main(void)
{
struct pru_rpmsg_transport transport;
uint16_t src, dst, len;
volatile uint8_t *status;
/* Allow OCP master port access by the PRU so the PRU can read external memories */
CT_CFG.SYSCFG_bit.STANDBY_INIT = 0;
/* Clear the status of the PRU-ICSS system event that the ARM will use to 'kick' us */
CT_INTC.SICR_bit.STS_CLR_IDX = FROM_ARM_HOST;
/* Make sure the Linux drivers are ready for RPMsg communication */
status = &resourceTable.rpmsg_vdev.status;
while (!(*status & VIRTIO_CONFIG_S_DRIVER_OK));
/* Initialize the RPMsg transport structure */
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.STS_CLR_IDX = 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);
}
}
}
}
/*
* main.c
*/
void main(void)
{
struct pru_rpmsg_transport transport;
uint16_t src, dst, len;
volatile uint8_t *status;
/* clear the status of the PRU-ICSS system event that the ARM will use to 'kick' us */
CT_INTC.SICR_bit.STATUS_CLR_INDEX = FROM_ARM_HOST;
/* Make sure the Linux drivers are ready for RPMsg communication */
status = &resourceTable.rpmsg_vdev.status;
while (!(*status & VIRTIO_CONFIG_S_DRIVER_OK));
/* Initialize pru_virtqueue corresponding to vring0 (PRU to ARM Host direction) */
pru_virtqueue_init(&transport.virtqueue0, &resourceTable.rpmsg_vring0, TO_ARM_HOST, FROM_ARM_HOST);
/* Initialize pru_virtqueue corresponding to vring1 (ARM Host to PRU direction) */
pru_virtqueue_init(&transport.virtqueue1, &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 31 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);
}
}
}
}
/*
* main.c
*/
void main(void)
{
struct pru_rpmsg_transport transport;
uint16_t src, dst, len;
volatile uint8_t *status;
/* allow OCP master port access by the PRU so the PRU can read external memories */
CT_CFG.SYSCFG_bit.STANDBY_INIT = 0;
/* Make sure the Linux drivers are ready for RPMsg communication */
status = &resourceTable.rpmsg_vdev.status;
while (!(*status & VIRTIO_CONFIG_S_DRIVER_OK));
/* Initialize pru_virtqueue corresponding to vring0 (PRU to ARM Host direction) */
pru_virtqueue_init(&transport.virtqueue0, &resourceTable.rpmsg_vring0, &CT_MBX.MESSAGE[MB_TO_ARM_HOST], &CT_MBX.MESSAGE[MB_FROM_ARM_HOST]);
/* Initialize pru_virtqueue corresponding to vring1 (ARM Host to PRU direction) */
pru_virtqueue_init(&transport.virtqueue1, &resourceTable.rpmsg_vring1, &CT_MBX.MESSAGE[MB_TO_ARM_HOST], &CT_MBX.MESSAGE[MB_FROM_ARM_HOST]);
/* Create the RPMsg channel between the PRU and ARM user space using the transport structure.
* The name 'rpmsg-pru' corresponds to the rpmsg_pru driver found
* at linux-x.y.z/drivers/rpmsg/rpmsg_pru.c
*/
while (pru_rpmsg_channel(RPMSG_NS_CREATE, &transport, CHAN_NAME, CHAN_DESC, CHAN_PORT) != PRU_RPMSG_SUCCESS);
while (1) {
if (CT_MBX.MESSAGE[MB_FROM_ARM_HOST] == 1) {
/* Receive the message */
if (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);
}
}
}
}
/*
* main.c
*/
int main() {
struct pru_rpmsg_transport transport;
uint16_t src, dst, len;
volatile uint8_t *status;
/* allow OCP master port access by the PRU so the PRU can read external memories */
CT_CFG.SYSCFG_bit.STANDBY_INIT = 0;
/* clear the status of event MB_INT_NUMBER (the mailbox event) and enable the mailbox event */
CT_INTC.SICR_bit.STS_CLR_IDX = MB_INT_NUMBER;
CT_MBX.IRQ[MB_USER].ENABLE_SET |= 1 << (MB_FROM_ARM_HOST * 2);
/* Make sure the Linux drivers are ready for RPMsg communication */
status = &resourceTable.rpmsg_vdev.status;
while (!(*status & VIRTIO_CONFIG_S_DRIVER_OK));
/* Initialize pru_virtqueue corresponding to vring0 (PRU to ARM Host direction) */
pru_virtqueue_init(&transport.virtqueue0, &resourceTable.rpmsg_vring0, &CT_MBX.MESSAGE[MB_TO_ARM_HOST], &CT_MBX.MESSAGE[MB_FROM_ARM_HOST]);
/* Initialize pru_virtqueue corresponding to vring1 (ARM Host to PRU direction) */
pru_virtqueue_init(&transport.virtqueue1, &resourceTable.rpmsg_vring1, &CT_MBX.MESSAGE[MB_TO_ARM_HOST], &CT_MBX.MESSAGE[MB_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 31 of register R31 to see if the mailbox interrupt has occurred */
#ifdef __GNUC__
unsigned int r31 = read_r31();
#else
unsigned int r31 = __R31;
#endif
if(r31 & HOST_INT){
/* Clear the mailbox interrupt */
CT_MBX.IRQ[MB_USER].STATUS_CLR |= 1 << (MB_FROM_ARM_HOST * 2);
/* Clear the event status, event MB_INT_NUMBER corresponds to the mailbox interrupt */
CT_INTC.SICR_bit.STS_CLR_IDX = MB_INT_NUMBER;
/* Use a while loop to read all of the current messages in the mailbox */
while(CT_MBX.MSGSTATUS_bit[MB_FROM_ARM_HOST].NBOFMSG > 0){
/* Check to see if the message corresponds to a receive event for the PRU */
if(CT_MBX.MESSAGE[MB_FROM_ARM_HOST] == 1){
/* Receive the message */
if(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);
}
}
}
}
}
return 0;
}
static void handle_mailbox_interrupt(struct pru_rpmsg_transport *transport)
{
uint16_t src, dst, len;
/* Clear the event status */
CT_INTC.SICR_bit.STS_CLR_IDX = 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 */
int d_mm = measure_distance_mm();
/* there is no room in IRAM for iprintf */
itoa(d_mm, payload, 10);
pru_rpmsg_send(transport, dst, src,
payload, strlen(payload) + 1);
}
}