Serial Peripheral Interface
SPI (. Serial Peripheral Interface, SPI bus , SPI) , Motorola . SPI (. four-wire) .
(. standard serial port), SPI , , (). () . - . , « » (. chip select) . , , SPI.
SPI :
- MOSI SI , (. Master Out Slave In). .
- MISO SO , (. Master In Slave Out). .
- SCLK SCK (. Serial Clock). .
- CS SS , (. Chip Select, Slave Select).
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SPI . «chip select» ( ) ( - ), , , . chip select. , .
unsigned char SPIBitBang8BitsMode0(unsigned char byte) { unsigned char bit; for (bit = 0; bit < 8; bit++) { /* MOSI */ if (byte & 0x80) SETMOSI(); else CLRMOSI(); byte <<= 1; /* */ SPIDELAY(SPISPEED/2); SETCLK(); /* */ SPIDELAY(SPISPEED/2); /* MISO on trailing edge */ byte |= READMISO(); CLRCLK(); } return byte; }
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