PIC18F4520 + NRF24L01
SI SO应该对调过来用。。
TX
/*
** Tx.c
** Transmit test program for PIC18F4520 and nRF24L01 or nRF24L01+
** Uses the Microchip C18 compiler
** Based on SFE code for the CC5X compiler in 24L01demo_V01.c
*/
#include <p18cxxx.h>
#include <spi.h>
#include <timers.h>
// Pragmas
#pragma config OSC = INTIO67
#pragma config PWRT = ON
//#pragma config MCLRE = OFF
#pragma config BOREN = OFF
//function prototypes
void init(void);
void transmit_data(void);
void configure_transmitter(void);
unsigned char spi_Send_Read(unsigned char);
unsigned char spi1_send_read_byte(unsigned char byte);
void dly(unsigned int);
// Defines
#define SPI_SCK LATCbits.LATC3 // Clock pin, PORTC pin 3
#define SPI_SO LATCbits.LATC5 // Serial output pin, PORTC pin 5
#define SPI_SI PORTCbits.RC4 // Serial input pin, PORTC pin 4
#define SPI_CSN LATCbits.LATC2 // CSN output pin, PORTC pin 2
#define SPI_CE LATCbits.LATC1 // CE output pin, PORTC pin 1
#define SPI_IRQ PORTBbits.RB0 // IRQ input pin, PORTB pin 0
#define SPI_SCALE 4 // postscaling of signal
#define LED LATDbits.LATD1
#define PB PORTAbits.RA1
// Macros
#define nop() _asm nop _endasm
void main(void)
{
init();
configure_transmitter();
while (1)
{
transmit_data();
LED = 1;
dly(63973); //200 ms delay
LED = 0;
dly(40000); //3.27 s delay
nop();
}
}
void init(void)
{
// run internal oscillator at 8 MHz
OSCCON = OSCCON | 0x70;
while (OSCCONbits.IOFS == 0)
;
PORTA = 0x00;
PORTD = 0X00;
ADCON1 = 0x0F; // set up PORTA to be digital I/Os
TRISA = 0x02; // PORTA<7.2,0> outputs PORTA<1> input
TRISD = 0XFD;
TRISCbits.TRISC3 = 0; // SDO output
TRISCbits.TRISC4 = 1;
TRISCbits.TRISC5 = 0; // SCK output
TRISCbits.TRISC2 = 0; // CSN output
TRISCbits.TRISC1 = 0; // CE output
TRISBbits.TRISB0 = 1; // IRQ input
OpenSPI(SPI_FOSC_16, MODE_00, SMPMID); //open SPI1
OpenTimer0( TIMER_INT_OFF &
T0_16BIT &
T0_SOURCE_INT &
T0_PS_1_256 );
}
void configure_transmitter(void)
{
unsigned char i, j, data, cmd;
SPI_CE = 0;
SPI_CSN = 0;
// PTX, CRC enabled, mask a couple of ints
spi_Send_Read(0x20);
spi_Send_Read(0x38);
SPI_CSN = 1;
SPI_CSN = 0;
//auto retransmit off
spi_Send_Read(0x24);
spi_Send_Read(0x00);
SPI_CSN = 1;
SPI_CSN = 0;
//address width = 5
spi_Send_Read(0x23);
spi_Send_Read(0x03);
SPI_CSN = 1;
SPI_CSN = 0;
//data rate = 1MB
spi_Send_Read(0x26);
spi_Send_Read(0x07);
SPI_CSN = 1;
SPI_CSN = 0;
//set channel 2, this is default but we did it anyway...
spi_Send_Read(0x25);
spi_Send_Read(0x02);
SPI_CSN = 1;
SPI_CSN = 0;
//set address E7E7E7E7E7, also default...
spi_Send_Read(0x30);
for (j = 0; j < 5; j++)
{
spi_Send_Read(0xE7);
}
SPI_CSN = 1;
SPI_CSN = 0;
//disable auto-ack, RX mode
//shouldn't have to do this, but it won't TX if you don't
spi_Send_Read(0x21);
spi_Send_Read(0x00);
SPI_CSN = 1;
}
void transmit_data(void)
{
unsigned char i, data, cmd;
SPI_CSN = 0;
//clear previous ints
spi_Send_Read(0x27);
spi_Send_Read(0x7E);
SPI_CSN = 1;
SPI_CSN = 0;
//PWR_UP = 1
spi_Send_Read(0x20);
spi_Send_Read(0x3A);
SPI_CSN = 1;
SPI_CSN = 0;
//clear TX fifo
//the data sheet says that this is supposed to come up 0 after POR, but that doesn't seem to be the case
spi_Send_Read(0xE1);
SPI_CSN = 1;
SPI_CSN = 0;
//4 byte payload
spi_Send_Read(0xA0);
spi_Send_Read(0x34);
spi_Send_Read(0x33);
spi_Send_Read(0x32);
spi_Send_Read(0x31);
SPI_CSN = 1;
//Pulse CE to start transmission
SPI_CE = 1;
dly(65000); //delay 69 ms
SPI_CE = 0;
}
unsigned char spi_Send_Read(unsigned char byte)
{
SSPBUF = byte;
while(!DataRdySPI())
;
return SSPBUF;
}
void dly(unsigned int c)
{
INTCONbits.TMR0IF = 0;
WriteTimer0(c);
while (INTCONbits.TMR0IF == 0)
;
}
RX
/*
** Rx.c
** Receive test program for PIC18F4520 and nRF24L01 or nRF24L01+
** Uses the Microchip C18 compiler
** Based on SFE code for the CC5X compiler in 24L01demo_V01.c
**
** The LED is flashed five times when data are received.
** The received data in the buffer may be checked using the
** debugger Watch window.*/
#include <p18cxxx.h>
#include <spi.h>
#include <timers.h>
// Pragmas
#pragma config OSC = INTIO67
#pragma config PWRT = ON
#pragma config MCLRE = OFF
#pragma config BOREN = OFF
//function prototypes
void init(void);
void reset_RX(void);
void configure_RX(void);
unsigned char spi_Send_Read(unsigned char);
void dly(unsigned int);
// Defines
#define SPI_SCK LATCbits.LATC3 // Clock pin, PORTC pin 3
#define SPI_SO LATCbits.LATC5 // Serial output pin, PORTC pin 5
#define SPI_SI PORTCbits.RC4 // Serial input pin, PORTC pin 4
#define SPI_CSN LATCbits.LATC2 // CSN output pin, PORTC pin 2
#define SPI_CE LATCbits.LATC1 // CE output pin, PORTC pin 1
#define SPI_IRQ PORTBbits.RB0 // IRQ input pin, PORTB pin 0
#define SPI_SCALE 4 // postscaling of signal
#define LED LATDbits.LATD1
#define PB PORTAbits.RA1
// Macros
#define nop() _asm nop _endasm
void main(void)
{
unsigned char i;
init();
configure_RX();
while(1)
{
if (SPI_IRQ == 0) //wait for anything
{
for (i = 0; i < 5; i++) //flash LED 5 times if data received
{
LED = 1;
dly(63973); // 200 ms delay
LED = 0;
dly(63973); // 196 ms
}
dly(63973); // 196 ms
reset_RX();
}
}
}
// initialise 18F4520
void init(void)
{
// run internal oscillator at 8 MHz
OSCCON = OSCCON | 0x70;
while (OSCCONbits.IOFS == 0)
;
PORTA = 0x00;
PORTD = 0X00;
ADCON1 = 0x0F; // set up PORTA to be digital I/Os
TRISA = 0x02; // PORTA<7.2,0> outputs PORTA<1> input
TRISD = 0XFD;
TRISCbits.TRISC3 = 0; // SDO output
TRISCbits.TRISC4 = 1;
TRISCbits.TRISC5 = 0; // SCK output
TRISCbits.TRISC2 = 0; // CSN output
TRISCbits.TRISC1 = 0; // CE output
TRISBbits.TRISB0 = 1; // IRQ input
OpenSPI(SPI_FOSC_16, MODE_00, SMPMID); //open SPI1
OpenTimer0( TIMER_INT_OFF &
T0_16BIT &
T0_SOURCE_INT &
T0_PS_1_256 );
}
//configure nRF24L01 for receive
void configure_RX(void)
{
unsigned char i, j;
SPI_CSN = 0;
SPI_CE = 0;
//PRX, CRC enabled
spi_Send_Read(0x20);
spi_Send_Read(0x39);
SPI_CSN = 1;
SPI_CSN = 0;
//disable auto-ack for all channels
spi_Send_Read(0x21);
spi_Send_Read(0x00);
SPI_CSN = 1;
SPI_CSN = 0;
//address width = 5 bytes
spi_Send_Read(0x23);
spi_Send_Read(0x03);
SPI_CSN = 1;
SPI_CSN = 0;
//data rate = 1MB
spi_Send_Read(0x26);
spi_Send_Read(0x07);
SPI_CSN = 1;
SPI_CSN = 0;
//4 byte payload
spi_Send_Read(0x31);
spi_Send_Read(0x04);
SPI_CSN = 1;
SPI_CSN = 0;
//set channel 2
spi_Send_Read(0x25);
spi_Send_Read(0x02);
SPI_CSN = 1;
SPI_CSN = 0;
//set address E7E7E7E7E7
spi_Send_Read(0x30);
for (j = 0; j < 5; j++)
spi_Send_Read(0xE7);
SPI_CSN = 1;
SPI_CSN = 0;
//PWR_UP = 1
spi_Send_Read(0x20);
spi_Send_Read(0x3B);
SPI_CSN = 1;
SPI_CE = 1;
}
void reset_RX(void)
{
unsigned char i, j;
unsigned char buffer[4];
//Read RX payload
SPI_CSN = 0;
spi_Send_Read(0x61);
for (j = 0; j < 4; j++)
{
buffer[j] = spi_Send_Read(0);
}
SPI_CSN = 1;
//Flush RX FIFO
SPI_CSN = 0;
spi_Send_Read(0xE2);
SPI_CSN = 1;
SPI_CSN = 0;
//reset int
spi_Send_Read(0x27);
spi_Send_Read(0x40);
SPI_CSN = 1;
}
unsigned char spi_Send_Read(unsigned char byte)
{
SSPBUF = byte;
while(!DataRdySPI())
;
return SSPBUF;
}
void dly(unsigned int c)
{
INTCONbits.TMR0IF = 0;
WriteTimer0(c);
while (INTCONbits.TMR0IF == 0)
;
}
用PICKIT3 DEBUGER 看SSPBUF 来test addr
/*
** test.c
** SPI test program for PIC18F4520 and nRF24L01 or nRF24L01+
** Checks SPI comms between PIC and wireless chip
**
** RA0 LED (output)
** RA1 PB (input)
*/
#include <p18f4520.h>
#include <spi.h>
//function prototypes
unsigned char spi_Send_Read(unsigned char);
// Defines
#define SPI_SCK LATCbits.LATC3 // Clock pin, PORTC pin 3
#define SPI_SO LATCbits.LATC5 // Serial output pin, PORTC pin 5
#define SPI_SI PORTCbits.RC4 // Serial input pin, PORTC pin 4
#define SPI_CSN LATCbits.LATC2 // CSN output pin, PORTC pin 2
#define SPI_CE LATCbits.LATC1 // CE output pin, PORTC pin 1
#define SPI_IRQ PORTBbits.RB0 // IRQ input pin, PORTB pin 0
#define SPI_SCALE 4 // postscaling of signal
#define LED LATAbits.LATA0
#define PB PORTAbits.RA1
// Macros
#define nop() _asm nop _endasm
void main(void)
{
unsigned char status = 0;
unsigned char data[5];
int i;
// run internal oscillator at 8 MHz
OSCCON = OSCCON | 0x70;
while (OSCCONbits.IOFS == 0)
;
OpenSPI(SPI_FOSC_16, MODE_00, SMPMID); //open SPI1
PORTA = 0x00;
ADCON1 = 0x0F; // set up PORTA to be digital I/Os
TRISA = 0x02; // PORTA<7.2,0> outputs PORTA<1> input
TRISCbits.TRISC3 = 0; // SDO output
TRISCbits.TRISC5 = 0; // SCK output
TRISCbits.TRISC4 =1;
TRISCbits.TRISC2 = 0; // CSN output
TRISCbits.TRISC1 = 0; // CE output
SPI_CSN = 1; // CSN high
SPI_SCK = 0; // SCK low
SPI_CE = 0; // CE low
nop();
//write TX_ADDRESS register
SPI_CSN = 0; //CSN low
spi_Send_Read(0x30);
spi_Send_Read(0x11);
spi_Send_Read(0x22);
spi_Send_Read(0x33);
spi_Send_Read(0x44);
spi_Send_Read(0x55);
SPI_CSN = 1; //CSN high
//read TX_ADDRESS register
//Check that values are correct using the MPLAB debugger
SPI_CSN = 0; //CSN low
status = spi_Send_Read(0x10);
data[0] = spi_Send_Read(0x00); // 0x11
data[1] = spi_Send_Read(0x00); // 0x22
data[2] = spi_Send_Read(0x00); // 0x33
data[3] = spi_Send_Read(0x00); // 0x44
data[4] = spi_Send_Read(0x00); // 0x55
SPI_CSN = 1; //CSN high
// test PB and LED
while(1)
{
if (!PB)
LED = 1;
else
LED = 0;
}
}
unsigned char spi_Send_Read(unsigned char byte)
{
SSPBUF = byte;
while(!DataRdySPI())
;
return SSPBUF;
}