Rainbow-electronics ATmega3290P_V Manual de usuario descargar pdf (Pagina 156)

100

101

156

ATmega329/339/649/659

2552H–AVR–11/06

The following code examples show how to initialize the SPI as a Slave and how to per-

form a simple reception.

Note: 1. See “About Code Examples” on page 8.

Assembly Code Example

(1)

SPI_SlaveInit:

; Set MISO output, all others input

ldi r17,(1<<DD_MISO)

out DDR_SPI,r17

; Enable SPI

ldi r17,(1<<SPE)

out SPCR,r17

ret

SPI_SlaveReceive:

; Wait for reception complete

sbis SPSR,SPIF

rjmp SPI_SlaveReceive

; Read received data and return

in r16,SPDR

ret

C Code Example

(1)

void SPI_SlaveInit(void)

{

/* Set MISO output, all others input */

DDR_SPI = (1<<DD_MISO);

/* Enable SPI */

SPCR = (1<<SPE);

}

char SPI_SlaveReceive(void)

{

/* Wait for reception complete */

while(!(SPSR & (1<<SPIF)))

;

/* Return Data Register */

return SPDR;

}

1 2 ... 151 152 153 154 155 156 157 158 159 160 161 ... 374 375

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics ATmega3290P_V Manual de usuario Pagina 156

Comentarios a estos manuales

Relacionado con productos y manuales para Sensores Rainbow-electronics ATmega3290P_V