Problem on I2C master 16F877

[Loic]

Hi, I have write this code, but nothing happen on I2C pin I don't understand why! Could somebody help-me?

This is my master code

#include <16F877A.h>
#use delay(clock=16000000)
#fuses HS,NOWDT,NOPUT,NOLVP, NOBROWNOUT
#use i2c(master,sda=PIN_C4,scl=PIN_C3,force_hw,fast) // Hardware i2c
#include <protocol_i2c.h>
#define SLAVE_ADDR 0x40
void main() {

set_tris_b(0x00); //all output
// Program loops continuously
output_high(pin_b7);
while(1) {
output_low(pin_b6);
i2c_start();
output_low(pin_b7);
i2c_write(SLAVE_ADDR);
i2c_write(ilcd1);
i2c_write(Start_pos);
i2c_write(0x09);
i2c_stop();
delay_us(50);

output_High(pin_b6);
}
}

One thing strange is that pin B6 go high and low but pin C4 & C3 believe high.

Excuse my bad english and thanks to help me.

Loïc

[Markus]

Hi Loic,

try the following:

1.

[Guest]

Hi, thank you Markus for your answer. But there is two problem:
first one : my version of CCS (IDE 3.14, PCB & PCM 3.094) don't know "nodebug"!
second : if i'm don't use "force_hw", SCL is alwais low! (Of course I use pull-up!)

Regards,
Loïc

[Markus]

Hi Loic,

is this directive supported by your compiler version? (sorry, never worked with Ver. 3.094)