PIC routines for serial communications - GSM-Forum

majid · 06-19-2002, 04:45

Hi,

can any body, give info. about serial communications at different baud rates using PIC microcontrollers (16F84 for example)

so, any info or source code of clip even old.. will be welcome

BR;

---
Majid
[email protected]

Saulyss · 06-19-2002, 17:20

Search for highlevel PIC compiler , (C language as example) , there will be already build in serial communication funtion's .

majid · 06-19-2002, 20:48

is there a free C compiler for 16F628 ?

Thanks

Saulyss · 06-19-2002, 23:39

Try to search .... and after www.astalavista.box.sk .......

ZzX · 06-20-2002, 01:15

hi
you can with
4 mhz=posible to up 57600 boaund %0.0.1 error
8 mhz=posible to up 115200 boaund %0.1 error

rutin
SendChar232 ;
movwf SerByte ; store char to send out
movlw 8 ;
movwf BitsToGo ; # bits to send out
bcf TXpin232 ; send out start bit
movlw 0x56 ; [1] set length for start bit
Delay3W ; [258]
TXLoop232 ;
rrf SerByte ; [1]
btfsc STATUS,C ; [1] is it a 1?
goto TXOne232 ; [2] yes - send a '1'
bcf TXpin232 ; [1]
nop ; [1]
movlw 0x54 ; [1]
Delay3W ; [252]
decfsz BitsToGo ; [1]
goto TXLoop232 ; [2]
goto DoneByte232 ;
TXOne232 ;
bsf TXpin232 ; [1]
movlw 0x54 ; [1]
Delay3W ; [252]
decfsz BitsToGo ; [1]
goto TXLoop232 ; [2]
DoneByte232 ;
bsf TXpin232 ; [1] send out stop bit
movlw 0x54 ; [1]
Delay3W ; [252]
bsf TXpin232 ; idle state for TXpin
return ;

majid · 06-20-2002, 02:23

@ Saulyss : I found C2C and PICC which one is good for 16F628 ans for serial comm.

@ ZzX : Thanks man for this source

but the source is not complete, how to change baudrate and the delay function misses ...

I searches on the net I found some routines but each one if for a baud rate/ frequency, and need to use some formula to calculate delays ....

I will try to search more

BR;
Majid

Saulyss · 06-20-2002, 03:33

Check http://www.ccsinfo.com/ , i'm using this compiler , there a lot off built in function's I2C , SPI communication ....

Saulyss · 06-20-2002, 03:36

16F628 have build in hardware UART, so there u can avoid delay's and etc. And communcation can be completly interrupt based ....

Regard's

ZzX · 06-20-2002, 06:08

one calculate example you can modify
16F84 running at 10MHz - 9600 baud, 1bit=104uS => 260.4 cycles

majid · 06-22-2002, 01:43

Thanks brothers for advices :-)

Majid

06-19-2002, 04:45	#1 (permalink)
majid Freak Poster Join Date: May 2001 Location: .ma / .fr Posts: 200 Member: 4520 Status: Offline Thanks Meter: 0	PIC routines for serial communications Hi, can any body, give info. about serial communications at different baud rates using PIC microcontrollers (16F84 for example) so, any info or source code of clip even old.. will be welcome BR; --- Majid [email protected]

06-19-2002, 17:20	#2 (permalink)
Saulyss Freak Poster Join Date: Oct 2001 Location: Lithuania Posts: 326 Member: 6744 Status: Offline Thanks Meter: 0	Advice Search for highlevel PIC compiler , (C language as example) , there will be already build in serial communication funtion's .

06-19-2002, 23:39	#4 (permalink)
Saulyss Freak Poster Join Date: Oct 2001 Location: Lithuania Posts: 326 Member: 6744 Status: Offline Thanks Meter: 0	One more advice Try to search .... and after www.astalavista.box.sk .......

06-20-2002, 01:15	#5 (permalink)
ZzX Insane Poster Join Date: Feb 2002 Location: Afganistan,Turkey Posts: 80 Member: 9250 Status: Offline Thanks Meter: 0	........ hi you can with 4 mhz=posible to up 57600 boaund %0.0.1 error 8 mhz=posible to up 115200 boaund %0.1 error rutin SendChar232 ; movwf SerByte ; store char to send out movlw 8 ; movwf BitsToGo ; # bits to send out bcf TXpin232 ; send out start bit movlw 0x56 ; [1] set length for start bit Delay3W ; [258] TXLoop232 ; rrf SerByte ; [1] btfsc STATUS,C ; [1] is it a 1? goto TXOne232 ; [2] yes - send a '1' bcf TXpin232 ; [1] nop ; [1] movlw 0x54 ; [1] Delay3W ; [252] decfsz BitsToGo ; [1] goto TXLoop232 ; [2] goto DoneByte232 ; TXOne232 ; bsf TXpin232 ; [1] movlw 0x54 ; [1] Delay3W ; [252] decfsz BitsToGo ; [1] goto TXLoop232 ; [2] DoneByte232 ; bsf TXpin232 ; [1] send out stop bit movlw 0x54 ; [1] Delay3W ; [252] bsf TXpin232 ; idle state for TXpin return ;

06-20-2002, 03:33	#7 (permalink)
Saulyss Freak Poster Join Date: Oct 2001 Location: Lithuania Posts: 326 Member: 6744 Status: Offline Thanks Meter: 0	Check ... Check http://www.ccsinfo.com/ , i'm using this compiler , there a lot off built in function's I2C , SPI communication ....

06-19-2002, 20:48	#3 (permalink)
majid Freak Poster Join Date: May 2001 Location: .ma / .fr Posts: 200 Member: 4520 Status: Offline Thanks Meter: 0	is there a free C compiler for 16F628 ? Thanks

06-20-2002, 02:23	#6 (permalink)
majid Freak Poster Join Date: May 2001 Location: .ma / .fr Posts: 200 Member: 4520 Status: Offline Thanks Meter: 0	@ Saulyss : I found C2C and PICC which one is good for 16F628 ans for serial comm. @ ZzX : Thanks man for this source but the source is not complete, how to change baudrate and the delay function misses ... I searches on the net I found some routines but each one if for a baud rate/ frequency, and need to use some formula to calculate delays .... I will try to search more BR; Majid

06-20-2002, 03:36	#8 (permalink)
Saulyss Freak Poster Join Date: Oct 2001 Location: Lithuania Posts: 326 Member: 6744 Status: Offline Thanks Meter: 0	Also .......... 16F628 have build in hardware UART, so there u can avoid delay's and etc. And communcation can be completly interrupt based .... Regard's

06-20-2002, 06:08	#9 (permalink)
ZzX Insane Poster Join Date: Feb 2002 Location: Afganistan,Turkey Posts: 80 Member: 9250 Status: Offline Thanks Meter: 0	....... one calculate example you can modify 16F84 running at 10MHz - 9600 baud, 1bit=104uS => 260.4 cycles

06-22-2002, 01:43	#10 (permalink)
majid Freak Poster Join Date: May 2001 Location: .ma / .fr Posts: 200 Member: 4520 Status: Offline Thanks Meter: 0	Thanks brothers for advices :-) Majid

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