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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATMEGA16 датащи(PDF) 132 Page - ATMEL Corporation |
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ATMEGA16 датащи(HTML) 132 Page - ATMEL Corporation |
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132 / 315 page  132 ATmega16(L) 2466E–AVR–10/02 The following code examples show how to initialize the SPI as a Slave and how to per- form a simple reception. Note: 1. The example code assumes that the part specific header file is included. SS Pin Functionality Slave Mode When the SPI is configured as a Slave, the Slave Select (SS) pin is always input. When SS is held low, the SPI is activated, and MISO becomes an output if configured so by the user. All other pins are inputs. When SS is driven high, all pins are inputs, and the SPI is passive, which means that it will not receive incoming data. Note that the SPI logic will be reset once the SS pin is driven high. The SS pin is useful for packet/byte synchronization to keep the slave bit counter syn- chronous with the master clock generator. When the SS pin is driven high, the SPI Slave 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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