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| Help!! SPI conn between 2 PICs |
 Posted: Wed Aug 23, 2006 6:46 pm |
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I am working on a SPI communication between 2 PICs
18F452 is Master
16F873 is Slave
I have the master code working, but I can not get the slave to work. I know master code is working because I have an Assembler code per MICROCHIP SPI tutorial in the slave. Confirmed that work, but I want to have it in CCS C instead of assembler.
How to get the data from the master?
CAn any body helP?
Here is my code:
Slave Code:
| Code: |
/*
//*********************
Example code demonstrates SPI connection between 2 PICs (18F452
and 16F876).
Master sends data (a counter), Slave receives and outputs to
LEDs on PORTB
//********************************************************************
*/
#include <16F873.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
int data;
void main()
{
//Ports Initialization
set_tris_a(0x3F); // PORTA to inputs
set_tris_b(0x00); // PORTB to outputs
set_tris_c(0x18); //Set SDO to output, SCK & SDI to input
setup_ADC_ports(NO_ANALOGS); //Turn off A/D ports, all
//porta will be use as digital
//SPI configuration
setup_spi(spi_slave | spi_h_to_l | spi_clk_div_16);
while(1)
{
// Test to see if data transfer complete?
if(!input(PIN_A5));
//Get data
data = spi_read();
output_b(data);
}
}
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Here is the Master Code:
| Code: |
/*
//*********************
Example code demonstrates SPI connection between 2 PICs (18F452
and 16F876).
Master sends data (a counter), Slave receives and outputs to
LEDs on PORTB
//********************************************************************
*/
#include <18F452.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
//Defined Chip Select PIN
#define SS PIN_A2
//Global Variables
int counter,data;
void main()
{
//Reset counter to 0
counter = 0;
//Ports Initialization
set_tris_a(0x00); // PORTA to outputs
set_tris_c(0x10); //Set SCK & SDO to output & SDI to input
setup_ADC_ports(NO_ANALOGS); //Turn off A/D ports, all
//porta will be use as digital
//SPI configuration
setup_spi(spi_master | spi_h_to_l | spi_clk_div_16);
while(1)
{
//Enable Chip Select pin (LOW)
output_low(SS);
//Send Data (counter) to Slave
spi_write(counter);
// Test to see if data transfer complete?
while(!spi_data_is_in());
//get data (does not use at this time
data=spi_read();
//Disable Chip Select PIN (HIGH)
output_high(SS);
//Update counter
counter ++;
//Delay routine so human eyes can see the flash
Delay_ms(100);
}
}
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Please help... |
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Guest
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| Posted: Wed Aug 23, 2006 7:03 pm |
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By the way just to clear, the comment said that I use the 876 but actually
I do use the 16F873 as the slave |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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