Hi,
We have a custom board with MK53DN512CLQ10 in which we are trying to analyze feasibility of using MQX based USB CDC implementation for a higher data rate.
To test the data rate achievable, I tried pushing a saved buffer say,
uint8_t recv_data[]={"C1234567D1234567E1234567F1234567G1234567H1234567I1234567J1234567"};
void Virtual_Com_App(void)
{
/* User Code */
// if(g_recv_size)
// {
// _mqx_int i;
//
// /* Copy Buffer to Send Buff */
// for (i = 0; i < g_recv_size; i++)
// {
// printf("Copied: %c\n", g_curr_recv_buf[i]);
// g_curr_send_buf[g_send_size++] = g_curr_recv_buf[i];
// }
// g_recv_size = 0;
// }
//
// if(g_send_size)
while(1)
{
g_send_size=sizeof(recv_data);
uint8_t error;
uint8_t size = g_send_size;
g_send_size = 0;
error = USB_Class_CDC_Send_Data(g_app_handle, DIC_BULK_IN_ENDPOINT,
recv_data, size);
if (!error && !(size % DIC_BULK_IN_ENDP_PACKET_SIZE)) {
/* If the last packet is the size of endpoint, then send also zero-ended packet,
** meaning that we want to inform the host that we do not have any additional
** data, so it can flush the output.
*/
error = USB_Class_CDC_Send_Data(g_app_handle, DIC_BULK_IN_ENDPOINT, NULL, 0);
}
if(error != USB_OK)
{
/* Failure to send Data Handling code here */
}
}
return;
}
After dumping the code, I tried capturing data via real term for 10seconds onto a file. The data rate seems very low as per the observed file. I am getting 800sps as per the implementation (As per file size). This data rate changes depending on my string length and the maximum I got is 1ksps.
Am i going wrong in configuration or doing something terribly wrong? Data rate is critical for our implementation in which there will be 5 (SPI and I2C peripherals) channels pushing out 2bytes data at say 1ksps or higher.
