The Ring
Posted: Fri Nov 08, 2019 4:52 pm
Buffer.
My current thing do is about using a Ring Buffer.
I know how to get the data on the pointer info.
What I'd like to do, if possible, is to read the entire contents of the ring buffer but only remove the first item, instead of removing all the items. I am under the impression that each retrieve requires a vRingbufferReturnItem. It makes sense to me that if I just do a vRingbufferReturnItem on the first item that the first item can be replaced leaving the other items in place but still able to be read?
My current thing do is about using a Ring Buffer.
Code: Select all
void fSendSerialToBrain( void *pvParameters )
{
CAN_frame_t rx_frame;
xSemaphoreGive ( sema_SendSerialToBrain );
bool PassTwo = false;
for (;;)
{
xEventGroupWaitBits (eg, evtSendSerialToBrain, pdTRUE, pdTRUE, portMAX_DELAY);
size_t item_size;
for (int i = 0; i < RingBufferTriggerSize; i++)
{
int *item = (int *)xRingbufferReceive(h_buf_LIDAR_INFO, &item_size, pdMS_TO_TICKS(0)); // reterive item from ring buffer, no wait
if (item != NULL)
{
vRingbufferReturnItem(h_buf_LIDAR_INFO, (void *)item); // remove item from ring buffer
// prep item for sending over CAN buss
if (!PassTwo)
{
rx_frame.FIR.B.FF = CAN_frame_std;
rx_frame.MsgID = 1;
rx_frame.FIR.B.DLC = 8;
rx_frame.data.u8[0] = *item & 0xFF;
rx_frame.data.u8[1] = (*item >> 8) & 0xFF;
rx_frame.data.u8[2] = (*item >> 16) & 0xFF;
rx_frame.data.u8[3] = (*item >> 24) & 0xFF;
PassTwo = true;
} else {
rx_frame.data.u8[4] = *item & 0xFF;;
rx_frame.data.u8[5] = (*item >> 8) & 0xFF;
rx_frame.data.u8[6] = (*item >> 16) & 0xFF;
rx_frame.data.u8[7] = (*item >> 24) & 0xFF;
ESP32Can.CANWriteFrame(&rx_frame); // send items over CAN buss
PassTwo = false;
}
}
}
}
vTaskDelete( NULL );
} // void fSendSerialToBrain( void *pvParameters )What I'd like to do, if possible, is to read the entire contents of the ring buffer but only remove the first item, instead of removing all the items. I am under the impression that each retrieve requires a vRingbufferReturnItem. It makes sense to me that if I just do a vRingbufferReturnItem on the first item that the first item can be replaced leaving the other items in place but still able to be read?