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PSoC™ 5, 3 & 1 Forum Discussions

alma_284856
Level 3
Level 3
First like received

Hi everyone,

   

I am using USBUARTwith PSoC 5LP. I would like to send "unsigned int" to my computer. 

   

If I use 

   

sprintf(buf, "%d\t%d\t%d\t%d\n\r",data[0],data[1],data[2],data[3],data[4]);
while(USBUART_1_CDCIsReady() == 0u);
USBUART_1_PutString(buf); 

   

It works well if I use PutString, but i want to send my data into an interface so I have to use PutChar. But when try   

   

                    for(j=0;j<4;j++){
                    while(USBUART_1_CDCIsReady() == 0u);    
                    USBUART_1_PutChar((data>>8)) ;
                    while(USBUART_1_CDCIsReady() == 0u);    
                    USBUART_1_PutChar((data&0xFF)) ; 
                    }             
Everytime there are datas missing. I don't understand why instead of receive 8 chars i receiv sometine 6, 7...

   

 

   

Thank you very much

   

 

   

btw I made the initialization  of the USB like this:

   

USBUART_1_Start(0u, USBUART_1_3V_OPERATION);
    while(!USBUART_1_GetConfiguration());
    USBUART_1_CDC_Init(); 

   

    while(USBUART_1_CDCIsReady() == 0u) ;

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4 Replies
odissey1
Level 9
Level 9
First comment on KBA 1000 replies posted 750 replies posted

alex934,

   

use USBUART_PutData(buf, buffer_size) to send all data at once like this:

   

 

   

 

   

// send four uint16 values using UART-USB

   

void SendDataPacket(uint16 Data0, uint16 Data1, uint16 Data2, uint16 Data3)

   

{

   

     static uint8 buff[8];

   

     const uint8 BUFF_SIZE = sizeof(buff);

   

 

   

    //Fill in output buffer->

   

     buff[0] = Data0>>8; // Send debug data in MSB first fashion

   

     buff[1] = Data0;

   

     buff[2] = Data1>>8;

   

     buff[3] = Data1;

   

     buff[4] = Data2>>8;

   

     buff[5] = Data2;

   

     buff[6] = Data3>>8;

   

     buff[7] = Data3;

   

 

   

     if(USBUART_1_GetConfiguration() != 0u) // Service USB CDC when device configured

   

    {

   

          while(USBUART_1_CDCIsReady() == 0u); // Wait for USB-UART is ready to send more data to the PC

   

          USBUART_1_PutData(buff, BUFF_SIZE); // Send data to PC

   

      }

   

}

   

 

   

 

   

Attached PSoC5LP  example of sending sine wave to Multichart (PC) application using USB-UART, and Multichart program.

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alma_284856
Level 3
Level 3
First like received

Thank you for your help

   

But I still got a problem, I put 254 in buff0 and buff5 to visualize my data;

   

     buff[0] = 254;
     buff[1] = Data0>>8; // Send debug data in MSB first fashion
     buff[2] = Data0;
     buff[3] = Data1>>8;
     buff[4] = Data1;
     buff[5] = 254;
     if(USBUART_1_GetConfiguration() != 0u) // Service USB CDC when device configured
    {
          while(USBUART_1_CDCIsReady() == 0u); // Wait for USB-UART is ready to send more data to the PC

   

          USBUART_1_PutData(buff, BUFF_SIZE); // Send data to PC
      }

   

 

   

And I my TeraTerm (virtual port) it display that :

   

   

As you can see between my square (254) data are sometime 2, sometime 4?!

   

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alma_284856
Level 3
Level 3
First like received

Well no I think its just because my Data>>8 = 0 so it s a Null char in ASCII Code, am right?

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odissey1
Level 9
Level 9
First comment on KBA 1000 replies posted 750 replies posted

Looks like it. In early days (PDP11 etc.) some characters were used for serving the "terminal" (monitor screen), as communication was done using 9kBd RS232. Some caused beeping, some clearing screen, some deleting entire row, etc.

   

Please take a look on previously attached USBUART demo, particularly on USBUART initialization and polling its status in the main loop. 

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