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kongfu1
Joined: 26 Apr 2010
Posts: 56
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| SPI port3 on 24EP512GU810 |
 Posted: Sat Nov 10, 2012 2:19 pm |
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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)
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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);
}
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In the code:
| Code: |
#INT_SPI3
void SPI_Msg(void)
{
unsigned int8 theByte;
theByte = spi_read3();
}
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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. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19469
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| Posted: Sat Nov 10, 2012 4:17 pm |
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#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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