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spi MISO - no exchange of data

 
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fkl



Joined: 20 Nov 2010
Posts: 44

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spi MISO - no exchange of data
PostPosted: Fri Sep 27, 2013 11:03 am     Reply with quote
Please help.
chip pic24fj064gb106

Code:

#pin_select SCK1OUT=PIN_B1
#pin_select SDI=PIN_B0
#pin_select SDO=PIN_B2
#use spi (MASTER, SPI1, MODE=0, BITS=8, ENABLE=PIN9, STREAM=SPI_PORT1_0, FORCE_HW)

...

main()
{
    ...
    spi_init(SPI_PORT1_0, 1000000);
    ...
    spi_write(0x05);
    data_in=spi_read(0);// data_in<=0xFF
    ...
}


On MOSI - is exchanged of data.
MISO - no exchange of data (line always high).
Checked using a logic analyzer.


Where is the error?
Ttelmah



Joined: 11 Mar 2010
Posts: 19343

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PostPosted: Fri Sep 27, 2013 12:42 pm     Reply with quote
Er. MOSI, is driven by the PIC.
MISO, has to be driven by the device at the other end of the connection.

What is driving it?.

Best Wishes
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