I2C in slace mode doesn't seem to set SSPCON correctly?

[Will Reeve]

No matter how I try I can’t get I2C to work properly with the CCS #use

I want:
#use i2c(Slave,sda=PIN_C4,scl=PIN_C3,force_hw,address=0x1F)

This line sets the address correctly, but leaves SSPCON = 0x00, when I want it to be 0x36 (which sets slave mode)

If I manually do
#byte SSPCON = 0x14
SSPCON = 0x36

all works well!!!!! But I don’t believe I should have to do this myself?
I am using 3.158 and a PIC16F873.

Any ideas?

Will
___________________________
This message was ported from CCS's old forum
Original Post ID: 144514836

[PCM programmer]

:=This line sets the address correctly, but leaves SSPCON = 0x00, when I want it to be 0x36 (which sets slave mode)
:=I am using 3.158 and a PIC16F873.
------------------------------------------------------------

I made the following test program and compiled it with
PCM vs. 3.158. It puts 0x36 into register 0x14.
See the .LST file below:

<PRE>
#include "c:\Program Files\Picc\Devices\16F873.H"
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 8000000)
#use i2c(Slave,sda=PIN_C4,scl=PIN_C3,force_hw,address=0x1F)
<BR>
void main(void)
{
char c;
<BR>
c = i2c_read();
<BR>
while(1);
}

0000 00252 .................... void main(void)
0004 0184 00253 CLRF 04
0005 301F 00254 MOVLW 1F
0006 0583 00255 ANDWF 03,F
0007 3006 00256 MOVLW 06
0008 1683 00257 BSF 03.5
0009 009F 00258 MOVWF 1F
0016 301F 00259 MOVLW 1F
0017 0093 00260 MOVWF 13

// Right here, it's moving 0x36 into register 0x14
0018 3036 00261 MOVLW 36
0019 1283 00262 BCF 03.5
001A 0094 00263 MOVWF 14
0000 00264 .................... {
0000 00265 .................... char c;
0000 00266 ....................
0000 00267 .................... c = i2c_read();
001B 1683 00268 BSF 03.5
001C 1814 00269 BTFSC 14.0
001D 2820 00270 GOTO 020
001E 1283 00271 BCF 03.5
001F 281B 00272 GOTO 01B
0020 1283 00273 BCF 03.5
0021 0813 00274 MOVF 13,W
0022 00A6 00275 MOVWF 26
0000 00276 ....................
0000 00277 ....................
0000 00278 .................... while(1);
0023 2823 00279 GOTO 023
0000 00280 .................... }
</PRE>

___________________________
This message was ported from CCS's old forum
Original Post ID: 144514853

[Will Reeve]

Hi,
Indeed my compiled code seems to do the same! Somewhere after that it is set to 0x00 as I have to manual set it to 0x36 in my init_hardware procedure and all works from then on! I will investigate. Thanks for you help.

Will
___________________________
This message was ported from CCS's old forum
Original Post ID: 144514946

[PCM programmer]

:=Hi,
:=Indeed my compiled code seems to do the same! Somewhere after that it is set to 0x00 as I have to manual set it to 0x36 in my init_hardware procedure and all works from then on! I will investigate. Thanks for you help.
---------------------------------------------------------

Look for a "setup_spi()" statement. This CCS function does
write to SSPCON.
___________________________
This message was ported from CCS's old forum
Original Post ID: 144514970