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ATmega324P Datasheet(PDF) 165 Page - ATMEL Corporation |
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ATmega324P Datasheet(HTML) 165 Page - ATMEL Corporation |
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165 / 377 page  165 7674F–AVR–09/09 ATmega164P/324P/644P The following code examples show how to initialize the SPI as a Slave and how to perform 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; } |
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