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how to send address and Hexadecimal value use UART

 
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harizal



Joined: 13 Apr 2018
Posts: 3
Location: Malaysia

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how to send address and Hexadecimal value use UART
PostPosted: Fri Apr 13, 2018 6:59 pm     Reply with quote

how to convert this code from hi-Tech C to CCS C Compiler:
i use MP14A (multiPWM) connected to PIC16F877A.


This Coding from Hi-Tech to activate the MultiPWM use UART:

send_serial(0x01); // send channel of PWM to activate PWM1
send_serial(0x7f); //send PWM value.PWM value for PWM1 is 127
send_serial(0x02); // send channel of PWM to activate PWM2
send_serial(0xff); //send PWM value.PWM value for PWM1 is 255

When i code in CCS C compiler like this it not working at all:

printf("%X",0x01); // Channel PWM1
printf("%X",0xFF); //Value of PWM
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Apr 13, 2018 7:40 pm     Reply with quote

Use putc(). It should work. Example:
Code:

putc(0x01); // send channel of PWM to activate PWM1
putc(0x7F); // send PWM value.PWM value for PWM1 is 127
putc(0x02); // send channel of PWM to activate PWM2
putc(0xFF); // send PWM value.PWM value for PWM1 is 255


Also, you don't have to use hex. You can just use the numbers. Example:
Code:

putc(1);   // Ch. 1
putc(127); // PWM value

putc(2);   // Ch. 2
putc(255); // PMW value

Here is the user's manual for the Cytron MP14A Multi-PWM chip (14-channels):
http://synacorp.my/v2/en/index.php?controller=attachment&id_attachment=267
Ttelmah



Joined: 11 Mar 2010
Posts: 19549

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PostPosted: Fri Apr 13, 2018 11:36 pm     Reply with quote

It's perhaps worth explaining 'why'.

Putc sends the single character. putc(0x1); sends the binary character '1' on the serial.
printf("%X",0x01); // Channel PWM1
This sends the value 1, encoded as an ASCII character. So the binary value 0x31.
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