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Problems with I2C on dsPIC30F6015

 
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timk



Joined: 03 Aug 2018
Posts: 11

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Problems with I2C on dsPIC30F6015
PostPosted: Tue Aug 21, 2018 3:37 am     Reply with quote
Hello,

I got problems to send messages via I2C of the dsPIC30F6015.
I just want to get a really simple program to work.
Code:

#use i2c(master,I2C1,stream=I2C_NFC)

...

while(1)
{
   i2c_start(I2C_NFC);
   i2c_write(I2C_NFC, 0xFF);
   i2c_stop(I2C_NFC);
   delay_ms(100);
}



The program is just a test program.
The compiler says """Error 12... Unknown identifier: I2C_NFC

I think is a small syntax-error.

Thanks in advance.
Ttelmah



Joined: 11 Mar 2010
Posts: 19550

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PostPosted: Tue Aug 21, 2018 4:15 am     Reply with quote
First question. What compiler version?. On very old compilers I2C streams didn't exist.
However assuming something from the last few years, what you post works:
Code:

#include <30F6015.h>
#device ICSP=1
#use delay(crystal=20000000)

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES CKSFSM                   //Clock Switching is enabled, fail Safe clock monitor is enabled
#FUSES NOBROWNOUT               //No brownout reset

#use i2c(master,I2C1,stream=I2C_NFC)

void main()
{
   while(TRUE)
   {
      i2c_start(I2C_NFC);
      i2c_write(I2C_NFC, 0xFF);
      i2c_stop(I2C_NFC);
      delay_ms(100);
   }
}

Compiles fine.

One thing that can happen, is a 'hidden' character. If you have typed a non displayable character in one of the I2C_NFC parts, then this would be the complaint you would get.
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