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SPI port3 on 24EP512GU810

 
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kongfu1



Joined: 26 Apr 2010
Posts: 56

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SPI port3 on 24EP512GU810
PostPosted: Sat Nov 10, 2012 2:19 pm     Reply with quote

Hi,

I have a project that uses three SPI ports. One of these is set as slave on spi 3:

Code:

#use spi(SLAVE, FORCE_HW, DI=PIN_D14, DO=PIN_D15, CLK=PIN_B13, BITS=8, SPI3, stream=SPI_RCB)

SPI_MOSI - PIN_D14
SPI_MISO - PIN_D15

and
Code:

#define SPI_MODE_3  (SPI_H_TO_L | SPI_XMIT_L_TO_H)
void initSPI3(void)
{
    setup_spi3(SPI_SLAVE | SPI_MODE_3);
   
   clear_interrupt(INT_SPI3);
   enable_interrupts(INT_SPI3);
}

In the code:
Code:

#INT_SPI3
void SPI_Msg(void)
{
   unsigned int8 theByte;
 
   theByte = spi_read3();
}

The interrupt INT_SPI3 was never triggered and spi_ck, spi_MOSI was captured on scope with CS signal. Everything looks OK.

My question is that, why INT_SPI3 is not triggered?
PIC24EP512GU810 and CCS ver4.134 are used.

Please help.
Thanks.
Ttelmah



Joined: 11 Mar 2010
Posts: 19536

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PostPosted: Sat Nov 10, 2012 4:17 pm     Reply with quote

#PIN_SELECT

Just as for the UART, you must use #pin_select to tell the compiler that the pin is connected to the hardware SPI _before using the #USE SPI command. Specifying FORCE_HW, doesn't make the selection happen, it just tells it to generate code for the hardware port. Without the selection, effectively the 'wiring' is not connected....

Best Wishes
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