How to writes binary data to the serial port?

[minodori]

Below source code is that sends decimal 65 to the terminal with USBUART by USBUART_1_PutData or USBUART_1_PutString function.

In my understanding, 6 and 4 are encoded as ascii 54 and 52 respectively and sent to the termnal,

and then the terminal decodes the values of 6 and 4 with this ascii code and finally displays 64 on the terminal

Can I send decimal 65 to the terminal as number 65 without encoding with ascii?

At this time, I suppose that 'A'(ASCII code:65) may be displayed on the terminal.

Arduino has Serial.print and Serial.Write funciton.

If you write Serail.print(65), 65 is displayed on the terminal and Serial.write(65) show charater 'A'.

Is there a function in PSoC 5LP can write binary data to serial port like Serial.write() of Arduino?

I would appreciate if you let me know if there is any possible way.

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uint8_t wrBuffer[USBUART_BUFFER_SIZE];

uint16_t rtnCmd = 65;

sprintf((char *)wrBuffer,"%d",rtnCmd);

USBUART_1_PutData((uint8 *)wrBuffer, strlen(char *) wrBuffer));

[roboteux · Accepted solution]

the USBUART_1_PutChar will take a binary data and send it as is.

The function USBUART_1_Putdata take a binary table and send the data as is.

In your exemple, the conversion from binary to ascii is donne via the sprintf call.

so USBUART_1_PutChar (65) will send the binary 65 to the uart, so the terminal will display A.

and your example will write 65 (in letters) to the terminal.

[minodori]

Hi roboteux,

As you commented, I modified my source as below and confirmed that the byte data is transmitted to the terminal as it is.

------------------------------------------------

uint8_t rtnCmd [1]= {65};

USBUART_1_PutData((rtnCmd, 1));

------------------------------------------------

I didn't really understand the behavior of sprintf and USBUART_1_PutData.

Thanks for your teaching.

[Len_CONSULTRON]

minodori,

As roboteux indicated you can use _PutChar() with any 8-bit data. 

_PutString() is not a good function for sending just any byte value.  NULLs are potentially a problem since they signal the end of the string.

You can also use _PutArray() or _WriteTxData() for sending all 256 variations of a byte.

[minodori]

Hi Len_CONSULTRON,

Thank you foryour replay.

I am now using USBFS macro for USBUART transmission.

In this case, there is no _PutArray() or _WriteTxData() funciton, which are included in UARTmacro.

Anyway when I use UART  instead USBFS macro, let me try above 2 functions.

Let me try to test _PutArray() or _WriteTxData

[Len_CONSULTRON]

minodori,

The USBUART has USBUART_PutChar() and USBUART_PutData()

[MotooTanaka]

Hi,

May be this is a redundant response, but I tried this with CY8CKIT-059 ... well, just for fun 😉

schematic

pins

main.c

#include "project.h"
#include "stdio.h"

#define STR_BUF_LEN 64
char str[STR_BUF_LEN+1] ; /* 1 for NULL */

int main(void)
{
    uint16_t rtnCmd = 65 ;
    
    CyGlobalIntEnable; /* Enable global interrupts. */

    UART_Start() ;
    
    UART_PutString("\x1b[2J\x1b[;H") ; /* Clear Screen */
    UART_PutString("Uart Print Test ") ;
    snprintf(str, STR_BUF_LEN, "(%s %s)\n\r", __DATE__, __TIME__) ;
    UART_PutString(str) ;
    
    // Writing 65 as 'A'
    UART_PutChar(rtnCmd) ;
    UART_PutString("\n\r") ;
    
    // Writing 65 as decimal string "65"
    snprintf(str, STR_BUF_LEN, "%d\n\r", rtnCmd) ;
    UART_PutString(str) ;
   
    for(;;)
    {
        /* Place your application code here. */
    }
}

Result Tera Term log

moto

 

[minodori]

Hi,

You did it for fun, but this also helped me:-)

Tthank you!