CC2538 CDC USB communicate with UART

Hello Hector,

Thank you for your response. I got the code you mentioned, but I am still confused that how can I send data to CDC usb port.

Assume that I want to send the letter 's', 'p', 'i' to the virtual usb port and then display it on Tera Term, can you please provide some example code?

Tao

Hello Hector,

Thank you very much for your kind help. 

Is there USB CDC library specification available?

I am going to get data from my sensor and then send the data to PC through USB CDC interface.

Best Regards,

Tao

Hi,

This will depend in your application and how you want to implement this functionality. Whenever your application needs to send data back to the USB host use the usbibufPush function to send the data.

Hi Hector,

Can you please give me an example code to output: 1, 2, 3 , 4, 5,......

The parameter for pSrc is 8 bits, so I am not sure how to output a number. 

Following is my code: 

#include "bsp.h"
#include "string.h"
#include "usb_firmware_library_headers.h"
#include "usb_cdc.h"
#include "usb_in_buffer.h"
#include "usb_out_buffer.h"



//*****************************************************************************
//
// Local variablse
//
//*****************************************************************************
USB_EPIN_RINGBUFFER_DATA usbCdcInBufferData;
USB_EPOUT_RINGBUFFER_DATA usbCdcOutBufferData;
static uint8_t pInBuffer[128];
static uint8_t pOutBuffer[128];
// static uint8_t pAppBuffer[128];


//*****************************************************************************
//
// Implementations of function that are required by usb framework.
//
//*****************************************************************************
void usbsuspHookEnteringSuspend(bool remoteWakeupAllowed) 
{
    if (remoteWakeupAllowed) 
    {
    }
}


void usbsuspHookExitingSuspend(void) {
}


//
// Application entry point
//
int main(void)
{

    //
    // Initialize board and system clock
    //
    bspInit(SYS_CTRL_32MHZ);

    //
    // Initialize buffers
    //
    memset(&usbCdcInBufferData, 0x00, sizeof(USB_EPIN_RINGBUFFER_DATA));
    usbCdcInBufferData.pBuffer = pInBuffer;
    usbCdcInBufferData.size = sizeof(pInBuffer);
    usbCdcInBufferData.endpointReg = USB_F4;
    usbCdcInBufferData.endpointIndex = 4;
    usbCdcInBufferData.endpointSize = 64;
    memset(&usbCdcOutBufferData, 0x00, sizeof(USB_EPOUT_RINGBUFFER_DATA));
    usbCdcOutBufferData.pBuffer = pOutBuffer;
    usbCdcOutBufferData.size = sizeof(pOutBuffer);
    usbCdcOutBufferData.endpointReg = USB_F4;
    usbCdcOutBufferData.endpointIndex = 4;
    
     
   
    uint16_t spiLength = 10;

    //
    // Enable the USB interface
    //
    usbCdcInit(115200);    //void usbCdcInit(uint32_t baudrate);

    //
    // Main loop
    //
    uint8_t i = 0;   
    while (1) 
    {
        //
        // Process USB events
      
      uint8_t* psr;
      psr=&i;
        //
      usbCdcProcessEvents();      
        //
        // Implement COM-port loopback
        //
      uint16_t count = usbibufGetMaxPushCount(&usbCdcInBufferData);
      uint16_t maxPopCount = usbobufGetMaxPopCount(&usbCdcOutBufferData);
      
      if (count > maxPopCount)
      {
        count = maxPopCount;
      }
      if (count)
      {
        // usbobufPop(&usbCdcOutBufferData, pAppBuffer, count);
        //
        // send the string "spi" to console 
        //
        usbibufPush(&usbCdcInBufferData, psr, spiLength);      
        
      }
      i++;
      
    }
}

However, I get the results from terminal like:

Hello YiKai,

Thank you for your information. I try to use other serial port terminal, and the hex format for my output like the following figure.

Now, I am lost, and I do not know how to solve this problem.

did you change spiLength to 1 instead of 10?

Hello Hector,

The results are correct after I change the spiLength to 1.