Guys,

How can I see that UART is sending and receiving my command in PSoC designer ?

and what's the meaning of :

PRT0DR |=  0X80;
        while(PRT0DR & 0X80)    

any helps will be appreciated,

thank you

I tried to send character :

BYTE sel_card[4]={0xAB,0x02,0x01}; 

for (i=0;i<3;i++)   
        {
            UART_1_PutChar(sel_card[i]); // Send a character to UART TX port
        }

and see in putty....it's sending something

is it because of baud rate ?

How can I get 9600 baud rate ?

thank you

Hi,

You will need to send characters in ascii format to see it on the terminal.

For example,

 UART_1_PutChar('A');

or UART_1_PutChar(0x41); // Hex

or UART_1_PutChar(65); // Dec

all will display single character A on your terminal.

Pls refer to the ASCII table

Make sure to convert your array elements to ascii using this table before displaying.

When you place the UART, there is a clock source selection, select the one the you want to use as the clock source, it can be one of the VC1, VC@ and VC3, or from other row input or outputs. the clock should be 8 times the baud rate, and you need to start the UART specifying the parity as well.

PRT0DR |=  0X80;
        while(PRT0DR & 0X80)  

What is the intention of this code?

PRT0DR is the Port0 data register. 

If your Port 0, Pin 7 is configured as output, above code will cause an infinite loop.

Most probably, I think it's set to Pull up drivemode, and the first statement enables the pullup.

The seconds line waits till it detects pin7 has been pulled down by an external switch/input.

is it right for 9600 ?

If I want to send :

AB 02 01 ? how can I do that ?

Please correct me if I'm wrong :

BYTE sel_card[3]={0xAB,0x02,0x01};

    UART_1_CmdReset();                // Reset Command Buffer
    UART_1_Start(UART_1_PARITY_NONE);        // Start UART

    UART_1_CmdReset();

for (i=0;i<3;i++)   
        {
           
            UART_1_PutChar(sel_card[i]); // Send a character to UART TX port
        }

9600 baud =

24 Mhz / 8 / 3 /20 =75000 hz

baud = 75000 Hz / 8 nearly 9600, is my calculation right ?

The datasheet is not quite clear at this point, but I think you have to check the UART_bReadTxStatus() to see if the transmit-buffer is empty and may receive another character for transmission.

Bob

I want to create this logic :

Please correct me if I'm wrong :

BYTE sel_card[1]={0x01};      // Select Mifare card command  return 10 bytes

        for (i=0;i<1;i++)   
        {
           
            UART_1_PutChar(sel_card[i]); // Send a character to UART TX port
        }

        if(UART_1_cGetChar()==0x01)
        {
            byte_length = UART_1_cGetChar();
            for (i=0;i<byte_length;i++)
            {
                RxdataBuff[i] = UART_1_cGetChar();    // Get a character from UART RX data register
            }           
            LCD_1_Position(0,0);
            switch(RxdataBuff[1])            // Check status byte
            {
                case 0x02:            // If 0x00 : Operation success
                    LCD_1_PrString(Cardf_Str);    // Print "Card selected" on the LCD  ;
                    LCD_1_Position(1,0);
                    LCD_1_PrCString("SN: ");
                    for (i=2;i<6;i++)
                    {           
                        LCD_1_PrHexByte(RxdataBuff[i]); // Print serial number of the card detected
                    }                   
                    break;
                case 0x01:
                    LCD_1_PrString(Notag_Str);      // Print "No tag" on the LCD  ;
                    LCD_clr_line(1);
                    break;
                case 0x0A:
                    LCD_1_PrString(Colli_Str);      // Print "Collision occur" on the LCD  ;    
                    LCD_clr_line(1);
                    break;
                case 0xF0:
                    LCD_1_PrString(Chksm_Str);      // Print "Checksum error" on the LCD  ;    
                    LCD_clr_line(1);
                    break;                           
            }
        }

 Re clock:

You divider is around 2.4% off. your divider is 8 * 2 *20 = 320, I would try divider ot 312. 

What's the different between :

UART_1_cReadChar() =='a'

        UART_1_cGetChar()=='a'

I can see it sends character already with

UART_1_PutChar('a');

but when I used putty and send it to the board,

it didn't response to :
if (UART_1_cReadChar() =='a')

{

.....................

}

why is this "if" doesn't work ?

if(UART_1_cGetChar()=='a')
        {
            byte_length = UART_1_cGetChar();
                       for (i=0;i<byte_length;i++)
            {
                RxdataBuff[i] = UART_1_cGetChar();    // Get a character from UART RX data register
               
            }           
            LCD_1_Position(0,0);
            switch(RxdataBuff[1])            // Check status byte
            {    
                  case 'a':
                                  LCD_1_PrString(Cardf_Str);    // Print "Card selected" on the LCD  ;
                    LCD_1_Position(1,0);
                    LCD_1_PrCString("SN: ");
                    for (i=2;i<6;i++)
                    {           
                        LCD_1_PrHexByte(RxdataBuff[i]); // Print serial number of the card detected
                    }                   
                    break;

to HL, how can you make it 312 ???

 If you use VC, it would be  8 * 3 * 13 or  8 * 39.

For testing purpose, using VC is Ok, I normally use timer/counter as divider.

char UART_cGetChar(void)

Return character from RX Data register when valid data is available. Function does not return until character is received.

char UART_cReadChar(void)

Read RX Data register immediately. If valid data is not available, return 0, else ASCII char between 1 and 255 is returned.

You can find these information inside the datasheet of the UART UM.

to HL

why is this "if" doesn't work ?

if(UART_1_cGetChar()=='a')

is it because of the speed ?

Thank you mate

Hi HL,

Any examples for : " I normally use timer/counter as divider."

Thank you

I sent 'a' to RX buffer but no response:

Hi bianchi,

can you provide us with an actual archive* of your project or even a subset of it that shows the non-working part. Maybe some of your settings in the chip-view are not as required. This will help us to answer several questions at once: How to set up a baud-rate-generator, and getting UART to work.

You did not tell (or I overlooked it) about the hardware you use, is it a PSoC1 developement kit or your own hardware. Do you use RS232-level shifters to meet the desired voltages on youe PC-side?

Bob

*) to do so: under "File -> Archive Project (complete)" there will be a .Zip archive generated which you may upload here as an attached file.

Ok I uploaded the complete project,

please have a look,

any suggestions will be very appreciated,

I'm using PSoC 1 and serial port on my laptop.

thank you

An earlier poster was incorrect on this -

PRT0DR |= 0X80;
while(PRT0DR & 0X80)

PRT0DR is the data register for Port 0. The register that controls drive mode is the

following -

Note PRT0DR |= 0X80; is a read/modify write intruction, and needs to be used

with a shadow register. See following discussion on shadow registers -

http://www.cypress.com/?rID=2900

http://www.cypress.com/?rID=39497

Regards, Dana.

In terms of coding style, if you are pressed for code space and speed,

switch statement may not be best approach, see -

http://www.cypress.com/?rID=45644

Regards, Dana.

You have CPU_Clock set to SysClk/8, while you are debugging

you might consider SysClk/1. A key reason to set it at a slower

speed, therefore reduced MIPs, is for lower power, but if you have

a lot of code to execute keep the MIPs up until you can establish

you can satisfy all code MIP needs with reduced speed/power.

Regards, Dana.

To Dana,

"switch statement may not be best approach, see" -

So better use "if" or you have a better solution ?

strange that, I only do a simple experiment but so hard to implement in cypress.....

a lot easier with AT89S52..

You have CPU_Clock set to SysClk/8, while you are debugging

you might consider SysClk/1. A key reason to set it at a slower

speed, therefore reduced MIPs, is for lower power, but if you have

a lot of code to execute keep the MIPs up until you can establish

you can satisfy all code MIP needs with reduced speed/power.

Regards, Dana.

Reply : will it make my UART code working ? or still the same thing ??

With CPU set to SysClk/8, or 3 Mhz, and VC1+ VC2 + VC3 set

to /8/3/13 your baudrate is 9600.

So I would think running CPU at 3 Mhz should be OK.

My comments on CASE statement were made w/o looking at your project.

Use of CASE is fine in your example project, its when your processor is

heavily loaded one might re-examine use of CASE.

When you display characters on LCD they have to be "displayable" characters.

In the case of the Hitachi there are a number of non displayable byte values,

as you can see in this chart. Same is true for a PC acting as a terminal.

Regards, Dana.

The clock accuracy for a UART, see following -

http://www.cypress.com/?rID=39848

Regarding BYTE transmission by UART, there is no limitation on what

BYTE value you can send, its up to the Rx end to determine if it is a displayable

ASCII character or a command. As in prior post not all BYTE values can be dis-

played by LCD, but you could convert non displayable characters into a message

with suitable code.

Regards, Dana,

Thanks Dana for the response,

I'll try to re-code again with the simplest thing I want, without any case or something like that,

just send character and detect if there's character from PC ( putty )

It should work otherwise, I can say it's not easy to use cypress processor.....

It's only simple matter and the processor gives me too much trouble to implement...

I re-code them very simple only send 'a' and receive 'a'.....

Hopefully there's response, I'm testing it now

#include <m8c.h>        // part specific constants and macros
#include "PSoCAPI.h"    // PSoC API definitions for all User Modules
#include <stdlib.h>


/*---------------------------------------------------------------------------------
void LCD_clr_line(unsigned char j)
function :     clear LCD on line number j (0 or 1)
input         line number j
----------------------------------------------------------------------------------*/
void LCD_clr_line(unsigned char j)
{
    LCD_1_Position(j,0);
    LCD_1_PrCString("                ");
}

void main(void)
{ 
    BYTE i;
     
    LCD_1_Start();                // Initialize LCD
    UART_1_CmdReset();                // Reset Command Buffer
    UART_1_Start(UART_1_PARITY_NONE);        // Start UART
    LCD_1_Position(0,0);                // Set LCD position
    LCD_1_PrCString("BaudRate = 9600 ");
    LCD_1_Position(1,0);                // Set LCD position
    LCD_1_PrCString("Enter char a ");
 

    while(1)
    {
       UART_1_CmdReset();            // Reset UART Command Buffer
        for (i=0;i<1;i++)   
        {
            UART_1_PutChar('a'); // Send a character ('a') to UART TX port
        }
       
         UART_1_CmdReset();            // Reset UART Command Buffer
      if (UART_1_cGetChar() =='a')
        {
          LCD_1_Position(0,0);
          LCD_1_PrCString("a char received");
        }
        else
        {
            LCD_1_Position(0,0);       
            LCD_1_PrCString("Cardreader error");
        }
    }
}
 

I tried both :

and both are not working ? is there anything missing here ??? so complicated for accepting only one simple 'a' charactrer ??

what's the different with :

only low level and high level API ?

if I use :

 if (UART_1_cReadChar() =='a')

I got "Card reader error" and character 'a' is being sent into my laptop without stopping...

how about :

if (UART_1_bReadRxData() == 0x61)
 

?

Thats good news 'a' is showing up on laptop, in fact you are

in a continous while loop sending 'a's, so thats working.

Regards, Dana.

Thats good news 'a' is showing up on laptop, in fact you are

in a continous while loop sending 'a's, so thats working.

Regards, Dana.

to Dana

Yup it's working for sending character, but go back to my question, it can't receive 'a' character ?

is there any settings / code that I missed ?

It's very simple task and question, so please answer it with something simple too..

Thank you

The chip never does this task :

 if (UART_1_cGetChar() == 'a')
        {
          LCD_clr_line(0);
          LCD_clr_line(1);
          LCD_1_Position(0,0);
          LCD_1_PrCString("a char received");
        }

I have no idea why....

I pushed 'a' character from my keyboard.....and there's no response....

I tried to test :

  c = UART_1_cGetChar();
          UART_1_PutChar(c);   

nothing happened when I press any buttons on my computer ?

I don't understand in this poin, it's already very straight forward.

 I cannot install desinger 5.3 at home so cannot check your project now.

Do you use the psoc evac kit /board to develope you project or you use your own board?

! would also check the following:

1. connect the  tx output of posc to rx input of psoc ,

  while

   {

    send 1 byte

    read 1 char (use cgetChar)

 print the received char. 

wait 1 second 

}

See if this works or not.

If it doesn't check then check and change your clock sync selection of UART.

Do not use cReadChar or iReadChar for now as it would return immedialy even nothing is received.

I'm using PSoC 1 board from cypress

 Have you tried the loop back test I suggested.

Here is a project you can check

http://www.cypress.com/?id=4&rID=58574

  while

   {

    send 1 byte

    read 1 char (use cgetChar)

 print the received char. 

wait 1 second 

}

while(1)
    {
  
   
    c = UART_1_bReadRxData();
    UART_1_SendData(c);
   }
  

Here is a project you can check

http://www.cypress.com/?id=4&rID=58574

I have studied that article but it doesn't include on how to receive one character on the RX port.....

does anyone know ?

thank you

You have interrupts off, basically in a polled mode.

Can you set up a DSO and capture Tx line from PC to PSOC Rx line to see if

PC is sending out keyboard character ?

When you use this -

UART_cReadChar

Description:

Reads UART RX port immediately if data is not available or an error condition exists, or zero is returned. Otherwise, the character is read and returned.

 Am I mistaken or does your code read once the character sent to it from PC, then all other

time gets no char, so net effect is you have a very low duty cycle write to display of receiving

a character, alternated most of the time no character received, net effect is you never see the

message chaqracter received on LCD ? Note also you use

            byte_length = UART_1_cReadChar();
            for (i=0;i<byte_length;i++)    {
           
                RxdataBuff[i] = UART_1_cGetChar();    // Get a character from UART RX data register
            }

Does the byte_length = character received a non legit value for use as a index into RxdataBuff ?

Regards, Dana.

  while (1)

 {

/* Send one character via the UART TX */

    send 1 byte; (eg  'A')

/* rea one character from the RX of UART*/

/* ONLY USE cGetchar(), it would wait forever if not receive */

    read 1 char (use cgetChar)

/* print the received charater on LCD, any location would do */

     print the received char. to LCD line 1 colum 0

/* a little bit of delay */

   wait 1 second 

/* print another charter to LCD 1,0 so if a new character is receive */

/* if would be noticed */

  print a leter 'B' to LCD line 1,colum 0

}

can you write it in a real code please ? I can't guess what you mean

 while (1)

 {

/* Send one character via the UART TX */

    send 1 byte; (eg  'A')

/* rea one character from the RX of UART*/

/* ONLY USE cGetchar(), it would wait forever if not receive */

    read 1 char (use cgetChar)

/* print the received charater on LCD, any location would do */

     print the received char. to LCD line 1 colum 0

/* a little bit of delay */

   wait 1 second 

/* print another charter to LCD 1,0 so if a new character is receive */

/* if would be noticed */

  print a leter 'B' to LCD line 1,colum 0

}

while(1)
    {
        PRT0DR |=  0X80;
        while(PRT0DR & 0X80)         //Test tag detect signal
        {                //  low level indicating tag in detection range;
            LCD_1_Position(0,0);        //  high level indicating tag out.
            LCD_1_PrString(Notag_Str);    // Print "No tag" on the LCD  ;
        }
       
        UART_1_CmdReset();            // Reset UART Command Buffer
        //for (i=0;i<4;i++)   
        for (i=0;i<1;i++)   
        {
            UART_1_PutChar('a'); // Send a character ('a') to UART TX port
            //UART_1_PutChar(sel_card[i]); // Send a character to UART TX port
            //UART_bReadTxStatus();
        }
         UART_1_CmdReset();            // Reset UART Command Buffer
         c = UART_1_cGetChar();

        if (c =='a')
       
        {
          LCD_1_Position(0,0);
          LCD_1_PrCString("a char received");
           
            byte_length = UART_1_cGetChar();
          for (i=0;i<byte_length;i++)
            {
                RxdataBuff[i] = UART_1_cGetChar();    // Get a character from UART RX data register
                 
            }           
            LCD_1_Position(0,0);
            LCD_1_PrCString("a char received");
            switch(RxdataBuff[1])            // Check status byte
            {    
                  case 'a':
                    LCD_1_PrString(Cardf_Str);    // Print "Card selected" on the LCD  ;
                    LCD_1_Position(1,0);
                    LCD_1_PrCString("SN: ");
                    for (i=2;i<6;i++)
                    {           
                        LCD_1_PrHexByte(RxdataBuff[i]); // Print serial number of the card detected
                    }                   
                    break;
               
                case 'b':
                    LCD_1_PrString(Notag_Str);      // Print "No tag" on the LCD  ;
                    LCD_clr_line(1);
                    break;
                case 'c':
                    LCD_1_PrString(Colli_Str);      // Print "Collision occur" on the LCD  ;    
                    LCD_clr_line(1);
                    break;
                case 'd':
                    LCD_1_PrString(Chksm_Str);      // Print "Checksum error" on the LCD  ;    
                    LCD_clr_line(1);
                    break;
                      
            }
        }
        else
        {
            LCD_1_Position(0,0);       
            LCD_1_PrCString("Cardreader error");
        }
    }

i'm not sure this :

 c = UART_1_cGetChar();

        if (c =='a')

working properly...???

Please give a test drive if you guys have a time....

thank you

it's better if there's a practical example of receiving character,

since I can send already.....but I can't receive I'm sure the wire connection is right...

P2.7 to TX and P1.6 to RX  J13 female header...

it is the first tick.

Did you check if there is a correct RS232 signal to your PSoC RX pin?

I tried  the code :

 UART_1_CPutString("Testing UART");
    c = UART_1_cGetChar();
    while (c !='')
    {
       
        UART_1_PutChar(c);
    }

I don't understand why cGetChar() doesn't give me any response.....big question mark,  I check all the parameter and they're all fine.

I follow from the schematic :

P1.6 RX

P2.7 TX

If there is no correct 232 signal at the input pin, even if your software is correct, it will not receive.

Can you check if your have the correct 232 signal on the RX pin of the PSoC?

Got the answer, I must press Enter after I put the character, it works now,

thanks guys...

How can I get the character without pressing enter ?

I need it for detecting card :

while(1)
    {
    UART_1_CmdReset();            // Reset UART Command Buffer
    
    //Put command to card
    UART_1_PutChar(0x01);

    
    
    c = UART_1_cGetChar();  // how can I take it without waiting for enter button ?
    
      if (c == 0x01)
      {
        LCD_clr_line(0);
        LCD_clr_line(1);
        LCD_1_Position(0,0);                // Set LCD position
        LCD_1_PrCString("Card in ");
     }
     else
     {
        LCD_clr_line(0);
        LCD_clr_line(1);
        LCD_1_Position(0,0);                // Set LCD position
        LCD_1_PrCString("Card out ");
     }
    
   }

You mean you need to press ENTER on your laptop to send the 'a' to the PSOC?

I do not use putty so not sure if that can be change, I use realTerm which is a very flexible terminal software. Have a look.

You mean you need to press ENTER on your laptop to send the 'a' to the PSOC?

I do not use putty so not sure if that can be change, I use realTerm which is a very flexible terminal software. Have a look.

Yup, I need to press ENTER in putty to send character.

How can I receive character without ENTER ? because it's sent from a RFID reader ...

I send a command then the reader will send response which will be received by Cypress (RX) UART_1_cGetChar(), I can't use ENTER button in this point

 I think you are using putty to test your program, so I suggest to try realterm because it can send one charater at a time without needing to press ENTER. 

I understand that your RFID would resonponse an 'a'.

My suggestion is to use a terminal software so you can control when to send and what to send to your psoc. Once you debug your software and works in a control way using a terminal software. you can use the true RFID to test.

However, it doesn't matter now as you already fix your software. 

Happy coding

you mean this one ?

To HL,

It's responding to 0x01, but not responding immediately, why is that ?

I'm using the software, you suggested me,

Thanks mate

The code :

c = UART_1_cGetChar();
       
      if (c == 0x01)
      {
        UART_1_CPutString("Char 0x01 accepted!");
        LCD_clr_line(0);
        LCD_clr_line(1);
        LCD_1_Position(0,0);                // Set LCD position
        LCD_1_PrCString("Card in ");
     }
     else
      if (c == 0xFE)
     {
        UART_1_CPutString("Char 0xFE accepted!");
        LCD_clr_line(0);
        LCD_clr_line(1);
        LCD_1_Position(0,0);                // Set LCD position
        LCD_1_PrCString("Card out ");
     }

I manually tested the RFID module through serial port,

it is not working, that's why I can't send command via my PSoC 1 board..