Changeset - 29a47f4a335d
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kripperger@CL-SEC241-09.cedarville.edu - 13 years ago 2012-11-27 14:55:18
kripperger@CL-SEC241-09.cedarville.edu
spi
6 files changed with 50 insertions and 29 deletions:
slave/slave/lib/sensors.c
20
slave/slave/lib/sensors.h
1
1
slave/slave/lib/spi.c
23
20
slave/slave/lib/spi.h
4
2
slave/slave/modules.c
2
1
slave/slave/slave.cproj
5
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slave/slave/lib/sensors.c
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@@ -12,4 +12,24 @@
 
#include "../config.h"
 
#include <util/delay.h>
 
#include "sensors.h"
 
#include "spi.h"
 
 
 
uint8_t readSpiTemp()
 
{
 
	// select TEMP wait 100 microseconds then read four bytes
 
	SELECT_TEMP;
 
	_delay_us(100);
 
	unsigned char one = send_spi(0xFF);
 
	_delay_us(100);
 
	unsigned char two = send_spi(0xFF);
 
	_delay_us(100);
 
	unsigned char three = send_spi(0xFF);
 
	_delay_us(100);
 
	unsigned char four = send_spi(0xFF);
 
	DESELECT_TEMP;
 
 
 
	//return ((0x1F & one) << 7) | (two >> 1);
 
	return 0;	//DEBUG
 
}
 
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slave/slave/lib/sensors.h
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@@ -9,7 +9,7 @@
 
#ifndef SENSORS_H_
 
#define SENSORS_H_
 
 
 
uint8_t readSpiTemp(void);
 
 
 
slave/slave/lib/spi.c
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@@ -13,27 +13,29 @@
 

			




	
	
	
		
 
void setup_spi(uint8_t mode, int dord, int interrupt, uint8_t clock)

			




	
	
	
		
 
{

			




	
	
	
		
 
	DESELECT_TEMP;

			




	
	
	
		
 
	

			




	
	
	
		
 
  // specify pin directions for SPI pins on port B

			




	
	
	
		
 
  if (clock == SPI_SLAVE) { // if slave SS and SCK is input

			




	
	
	
		
 
    DDRB &= ~(1<<SPI_MOSI_PIN); // input

			




	
	
	
		
 
    DDRB |= (1<<SPI_MISO_PIN); // output

			




	
	
	
		
 
    DDRB &= ~(1<<SPI_SS_PIN); // input

			




	
	
	
		
 
    DDRB &= ~(1<<SPI_SCK_PIN);// input

			




	
	
	
		
 
  } else {

			




	
	
	
		
 
    DDRB |= (1<<SPI_MOSI_PIN); // output

			




	
	
	
		
 
    DDRB &= ~(1<<SPI_MISO_PIN); // input

			




	
	
	
		
 
    DDRB |= (1<<SPI_SCK_PIN);// output

			




	
	
	
		
 
    DDRB |= (1<<SPI_SS_PIN);// output

			




	
	
	
		
 
  }

			




	
	
	
		
 
  SPCR0 = ((interrupt ? 1 : 0)<<SPIE0) // interrupt enabled

			




	
	
	
		
 
    | (1<<SPE0) // enable SPI

			




	
	
	
		
 
    | (dord<<DORD0) // LSB or MSB

			




	
	
	
		
 
    | (((clock != SPI_SLAVE) ? 1 : 0) <<MSTR0) // Slave or Master

			




	
	
	
		
 
    | (((mode & 0x02) == 2) << CPOL0) // clock timing mode CPOL

			




	
	
	
		
 
    | (((mode & 0x01)) << CPHA0) // clock timing mode CPHA

			




	
	
	
		
 
    | (((clock & 0x02) == 2) << SPR10) // cpu clock divisor SPR1

			




	
	
	
		
 
    | ((clock & 0x01) << SPR00); // cpu clock divisor SPR0

			




	
	
	
		
 
  SPSR0 = (((clock & 0x04) == 4) << SPI2X0); // clock divisor SPI2X

			




	
	
	
		
 
	if (clock == SPI_SLAVE) {		// if slave SS and SCK is input

			




	
	
	
		
 
		DDRB &= ~(1<<SPI_MOSI_PIN); // input

			




	
	
	
		
 
		DDRB |= (1<<SPI_MISO_PIN);	// output

			




	
	
	
		
 
		DDRB &= ~(1<<SPI_SS_PIN);	// input

			




	
	
	
		
 
		DDRB &= ~(1<<SPI_SCK_PIN);	// input

			




	
	
	
		
 
	} else {

			




	
	
	
		
 
		DDRB |= (1<<SPI_MOSI_PIN);	// output

			




	
	
	
		
 
		DDRB &= ~(1<<SPI_MISO_PIN); // input

			




	
	
	
		
 
		DDRB |= (1<<SPI_SCK_PIN);	// output

			




	
	
	
		
 
		DDRB |= (1<<SPI_SS_PIN);	// output

			




	
	
	
		
 
	}

			




	
	
	
		
 
	 SPCR0 = ((interrupt ? 1 : 0)<<SPIE0) // interrupt enabled

			




	
	
	
		
 
		| (1<<SPE0)			// enable SPI

			




	
	
	
		
 
		| (dord<<DORD0)		// LSB or MSB

			




	
	
	
		
 
		| (((clock != SPI_SLAVE) ? 1 : 0) <<MSTR0)  // Slave or Master

			




	
	
	
		
 
		| (((mode & 0x02) == 2) << CPOL0)			// clock timing mode CPOL

			




	
	
	
		
 
		| (((mode & 0x01)) << CPHA0)				// clock timing mode CPHA

			




	
	
	
		
 
		| (((clock & 0x02) == 2) << SPR10)			// cpu clock divisor SPR1

			




	
	
	
		
 
		| ((clock & 0x01) << SPR00);				// cpu clock divisor SPR0

			




	
	
	
		
 
	SPSR0 = (((clock & 0x04) == 4) << SPI2X0);	// clock divisor SPI2X

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
void disable_spi()

			




	
	
		
 
@@ -53,3 +55,4 @@ uint8_t received_from_spi(uint8_t data)

			




	
	
	
		
 
  SPDR0 = data;

			




	
	
	
		
 
  return SPDR0;

			




	
	
	
		
 
}

			




	
	
	
		
 

			




        

    


    
    

    

        

                

                    slave/slave/lib/spi.h
                

                

                  
                      
                        

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@@ -13,11 +13,14 @@

			




	
	
	
		
 
#include <avr/io.h>

			




	
	
	
		
 

			




	
	
	
		
 

			




	
	
	
		
 
#define SPI_SS_PIN PORTA1		//DEBUG 

			




	
	
	
		
 
#define SPI_SS_PIN PORTA1

			




	
	
	
		
 
#define SPI_SCK_PIN PORTB7

			




	
	
	
		
 
#define SPI_MOSI_PIN PORTB5

			




	
	
	
		
 
#define SPI_MISO_PIN PORTB6

			




	
	
	
		
 

			




	
	
	
		
 
#define SELECT_TEMP PORTA &= ~(1<<PA1)

			




	
	
	
		
 
#define DESELECT_TEMP PORTA |= (1<<PA1)

			




	
	
	
		
 

			




	
	
	
		
 

			




	
	
	
		
 
// SPI clock modes

			




	
	
	
		
 
#define SPI_MODE_0 0x00 /* Sample (Rising) Setup (Falling) CPOL=0, CPHA=0 */

			




	
	
		
 
@@ -63,6 +66,5 @@ uint8_t send_spi(uint8_t out);

			




	
	
	
		
 
uint8_t received_from_spi(uint8_t out);

			




	
	
	
		
 

			




	
	
	
		
 

			




	
	
	
		
 

			




	
	
	
		
 
#endif /* SPI_H_ */

			




	
	
	
		
 

			




        

    


    
    

    

        

                

                    slave/slave/modules.c
                

                

                  
                      
                        

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@@ -11,7 +11,7 @@

			




	
	
	
		
 
 #include "config.h"

			




	
	
	
		
 
 #include <util/delay.h>

			




	
	
	
		
 
 #include "modules.h"

			




	
	
	
		
 
 

			




	
	
	
		
 
 #include "lib/spi.h"

			




	
	
	
		
 
 

			




	
	
	
		
 
 

			




	
	
	
		
 
 void modules_setup(uint8_t id)

			




	
	
		
 
@@ -78,6 +78,7 @@

			




	
	
	
		
 
  

			




	
	
	
		
 
 void modules_sensors_setup()

			




	
	
	
		
 
 {

			




	
	
	
		
 
	 setup_spi(SPI_MODE_0, SPI_MSB, SPI_NO_INTERRUPT, SPI_MSTR_CLK16);

			




	
	
	
		
 
	  

			




	
	
	
		
 
 }

			




	
	
	
		
 
  

			




        

    


    
    

    

        

                

                    slave/slave/slave.cproj
                

                

                  
                      
                        

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@@ -169,10 +169,5 @@

			




	
	
	
		
 
  <ItemGroup>

			




	
	
	
		
 
    <Folder Include="lib" />

			




	
	
	
		
 
  </ItemGroup>

			




	
	
	
		
 
  <ItemGroup>

			




	
	
	
		
 
    <None Include="lib\SPIreadme.txt">

			




	
	
	
		
 
      <SubType>compile</SubType>

			




	
	
	
		
 
    </None>

			




	
	
	
		
 
  </ItemGroup>

			




	
	
	
		
 
  <Import Project="$(AVRSTUDIO_EXE_PATH)\\Vs\\Compiler.targets" />

			




	
	
	
		
 
</Project>

			




	
	
		
 
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