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korghs
Joined: 26 Aug 2011
Posts: 3
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| PIC24HJ (12GP202) and I2C |
 Posted: Fri Aug 26, 2011 11:45 am |
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Hi there,
I'm quite new to this Compiler and the PIC24HJ12GP202 and I'm actually stuck at the most stupid point, right at the beginning!
The aim is to simply communicate by I²C
| Code: |
#include <24HJ12GP202.h>
#use delay(clock=4000000)
#use i2c(i2c1,Master,Slow,force_hw)
void main()
{
output_high(pin_b15);
while (1)
{
output_high(pin_b14);
i2c_start();
delay_ms(50);
i2c_write(0xAA);
delay_ms(50);
i2c_stop();
output_low(pin_b14);
delay_ms(100);
}
}
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Watching each pin used, with an oscilloscope, b15 sticks to high, b14 jumps as wanted, but I've got absolutely no signal on b9(18/SDA1) or b8(17/SCL1).
Have I missed anything in the datasheet/ccs c docs?
Thanks!
P.S.
I'm currently running the limited eval of 4.122d. |
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korghs
Joined: 26 Aug 2011
Posts: 3
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| Posted: Fri Aug 26, 2011 2:21 pm |
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| Code: | | #use i2c(master, sda=pin_b9, scl=pin_b8) |
seems to be the easiest way to solve my problem.
Also played around with the pull-ups on sda and scl, got both down to 1.8k. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Aug 26, 2011 2:47 pm |
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| Quote: | #use i2c(i2c1,Master,Slow,force_hw)
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It's entirely possible that 'i2c1' and/or 'force_hw' uses the wrong pins or
the wrong registers in your version of the compiler. Using software i2c, as
you found, has a much better chance to work. |
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korghs
Joined: 26 Aug 2011
Posts: 3
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| Posted: Sat Aug 27, 2011 3:43 am |
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Interesting,
got down to
| Code: | | #use i2c(master, sda=pin_b9, scl=pin_b8, slow, force_hw) |
Seems to work, too |
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