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monteirotec
Joined: 25 Jan 2017
Posts: 1
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| #pin_select for SPI2 pic18f66j94 |
 Posted: Wed Jan 25, 2017 8:56 pm |
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I'd like to set SPI2 in slave mode, but I think that the code I'm using to configure the pin_select is wrong...
| Code: |
//#pin_select SCK2OUT=PIN_E2
#pin_select SCK2=PIN_E2
#pin_select SDO2=PIN_E0
#pin_select SDI2=PIN_E1
#use spi(SPI2)
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I put a breakpoint before the main loop to see the control registers of SPI2 pins and the values of registers are:
RPINR10_11<7:4> = h'F
RPOR30_31<3:0> = h'5
the values below are correct if my SPI2 will work in Master mode, but if it needs to work in slave mode, SCK2 will receive clocks, so its need to work like an input...
I expected these values:
RPINR10_11<7:4> = h'7
RPOR30_31<3:0> = h'F
if I try to declare slave in #use spi(SPI2, slave) the compiler returns error...
where I'm making a mistake? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Jan 26, 2017 12:31 am |
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The following test program compiles with vs. 5.066.
This is not a complete spi slave example. Its only purpose is to get the
correct pin selects and #use spi() statement so it will compile and produce
code for a hardware spi slave. It has not been tested in hardware.
| Code: |
#include <18f66j94.h>
#fuses HS, NOWDT
#use delay(clock=4M)
#pin_select SCK2IN=PIN_E2
#pin_select SDO2=PIN_E0
#pin_select SDI2=PIN_E1
#pin_select SS2IN=PIN_E7 // Slave Select pin
#use spi(SLAVE, SPI2, MSB_FIRST, BITS=8, FORCE_HW)
//======================================
void main(void)
{
int8 temp;
temp = spi_xfer(0x55);
while(TRUE);
} |
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