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ruppe
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| spi problems on 16f819 |
 Posted: Sat Apr 16, 2005 4:17 pm |
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is there anybody who has hardware spi working on the 16f819?
I actually can't see anything happen on the RB1, 2, and 4 pins.
Any known issues?
#fuses NOWDT,INTRC_IO, NOPUT, NOBROWNOUT, NOLVP, NODEBUG, PROTECT
#use fixed_io( b_outputs=PIN_B0, PIN_B5)
setup_spi(SPI_MASTER|SPI_H_TO_L|SPI_CLK_DIV_4);
Thanks,
ruppe |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Apr 16, 2005 11:09 pm |
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| Quote: | is there anybody who has hardware spi working on the 16f819 ?
I actually can't see anything happen on the RB1, 2, and 4 pins.
#use fixed_io( b_outputs=PIN_B0, PIN_B5)
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Your fixed_io() statement is preventing SPI from working.
The 16F819 data sheet lists how the i/o should be configured
for SPI. Your line doesn't conform to the data sheet:
| Quote: |
• SDI must have TRISB<1> set
• SDO must have TRISB<2> cleared
• SCK (Master mode) must have TRISB<4> cleared
• SCK (Slave mode) must have TRISB<4> set
• SS must have TRISB<5> set |
But in fact, the CCS setup_spi() function takes care of all this for you.
You don't need to set the tris on the SPI pins with code or a fixed_io()
statement.
If you still can't make it work after removing that line, then post your
version of the compiler, and I'll check if setup_spi() is working OK in
your version. |
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ruppe
Guest
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| Posted: Sun Apr 17, 2005 1:40 am |
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| Thank you. After deleting the fixed_io it worked. |
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