سلام، من می خوام 2 تا میکرو رو به هم وصل کنم از Spi استفاده کردم، می تونم اطلاعات رو از master به slave بفرستم ولی نمی تونم داده ها رو از slave بخونم
این هم کدهام:
Master:
Slave:
این هم کدهام:
Master:
کد:
unsigned char SPI_WriteRead(unsigned char dataout)
{
unsigned char datain;
// Start transmission (MOSI)
SPDR = dataout;
// Wait for transmission complete
while(!(SPSR & (1<<SPIF)));
// Get return Value;
datain = SPDR;
// Latch the Output using rising pulse to the RCK Pin
SPI_PORT |= (1<<SPI_CS);
_delay_us(1); // Hold pulse for 1 micro second
// Disable Latch
SPI_PORT &= ~(1<<SPI_CS);
// Return Serial In Value (MISO)
return datain;
}
int main(void)
{
unsigned char cnt;
unsigned char data;
data='0';
// Set the PORTD as Output:
DDRD=0xFF;
DDRC=0xff;
// Initial the AVR ATMega168 SPI Peripheral
// Set MOSI and SCK as output, others as input
SPI_DDR = (1<<PORTB5)|(1<<PORTB7)|(1<<PORTB4);
// Latch Disable (RCK Low)
SPI_PORT &= ~(1<<SPI_CS);
// Enable SPI, Master, set clock rate fck/2 (maximum)
SPCR = (1<<SPE)|(1<<MSTR);
SPSR = (1<<SPI2X);
// Reset the 74HC595 register
SPI_WriteRead(0);
int i;
while(1) {
data=SPI_WriteRead(2);
_delay_ms(100);
if(data==0x65){
PORTC |=(1<<PORTC1);
_delay_ms(300);
}else{
PORTC |=(1<<PORTC2);
_delay_ms(300);
}
}
return 0;
}
کد:
unsigned char SPI_WriteRead(unsigned char dataout)
{
unsigned char datain;
// Start transmission (MISO)
SPDR = dataout;
_delay_us(10);
// Wait for transmission complete
while(!(SPSR & (1<<SPIF)));
_delay_us(10);
// Get return Value;
//datain = SPDR;
// Latch the Output using rising pulse to the RCK Pin
SPI_PORT |= (1<<SPI_CS);
_delay_us(1); // Hold pulse for 1 micro second
// Disable Latch
SPI_PORT &= ~(1<<SPI_CS);
// Return Serial In Value (MISO)
return SPDR;
}
int main(void)
{
unsigned char cnt;
unsigned int data;
data=0;
// Set the PORTD as Output:
DDRD=0x00;
PORTD=0xff;
DDRC=0xff;
PORTC=0x00;
// Initial the AVR ATMega168 SPI Peripheral
// Set MOSI and SCK as output, others as input
SPI_DDR = (1<<PORTB3)|(1<<PORTB5)|(1<<PORTB2);
// Latch Disable (RCK Low)
SPI_PORT &= ~(1<<SPI_CS);
// Enable SPI, slave, set clock rate fck/2 (maximum)
SPCR = (1<<SPE);
SPCR &= ~(1<<MSTR);
SPSR = (1<<SPI2X);
// Reset the 74HC595 register
SPI_WriteRead(0);
while(1) {
data=SPI_WriteRead(0x65);
_delay_ms(100);
if(data==1){
PORTC|=(1<<PORTC1);
PORTC&=~(1<<PORTC2);
_delay_ms(300);
}else{
PORTC|=(1<<PORTC2);
PORTC&=~(1<<PORTC1);
_delay_ms(300);
}
if(!(PIND &(1<<PIND0))){
data=SPI_WriteRead(0x65);
_delay_ms(100);
}
}
return 0;
}
دیدگاه