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52 lines
1.3 KiB
52 lines
1.3 KiB
#include <stdint.h>
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#ifndef SPI_FULL_SPEED
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/**
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* SPI speed where 0 <= index <= 6
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*
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* Approximate rates :
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*
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* 0 : 8 - 10 MHz
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* 1 : 4 - 5 MHz
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* 2 : 2 - 2.5 MHz
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* 3 : 1 - 1.25 MHz
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* 4 : 500 - 625 kHz
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* 5 : 250 - 312 kHz
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* 6 : 125 - 156 kHz
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*
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* On AVR, actual speed is F_CPU/2^(1 + index).
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* On other platforms, speed should be in range given above where possible.
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*/
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/** Set SCK to max rate */
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#define SPI_FULL_SPEED 0
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/** Set SCK rate to half max rate. */
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#define SPI_HALF_SPEED 1
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/** Set SCK rate to quarter max rate. */
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#define SPI_QUARTER_SPEED 2
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/** Set SCK rate to 1/8 max rate. */
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#define SPI_EIGHTH_SPEED 3
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/** Set SCK rate to 1/16 of max rate. */
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#define SPI_SIXTEENTH_SPEED 4
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/** Set SCK rate to 1/32 of max rate. */
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#define SPI_SPEED_5 5
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/** Set SCK rate to 1/64 of max rate. */
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#define SPI_SPEED_6 6
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// Standard SPI functions
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/** Initialise SPI bus */
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void spiBegin(void);
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/** Configure SPI for specified SPI speed */
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void spiInit(uint8_t spiRate);
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/** Write single byte to SPI */
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void spiSend(uint8_t b);
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/** Read single byte from SPI */
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uint8_t spiRec(void);
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/** Read from SPI into buffer */
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void spiRead(uint8_t* buf, uint16_t nbyte);
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/** Write token and then write from 512 byte buffer to SPI (for SD card) */
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void spiSendBlock(uint8_t token, const uint8_t* buf);
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#endif
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