thodg/cgminer/spi-context.h

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• Hash : 60534e57
  Author :
  Date : 2013-12-24T00:33:42
  

  Initial import of Bitmine.ch A1 SPI driver
  
  This initial driver was designed around an FPGA based
  emulator board which provides 2 chained chips with 4
  hashing engines each, running at 10% of the A1's
  nominal speed.
  
  Driver has been tested on RasPi.
  
  Signed-off-by: Zefir Kurtisi <zefir.kurtisi@gmail.com>
  

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• spi-context.h

• #ifndef SPI_CONTEXT_H
  #define SPI_CONTEXT_H
  
  #include <linux/types.h>
  #include <linux/spi/spidev.h>
  #include <stdbool.h>
  #include <stdint.h>
  
  #define SPI_DEVICE_TEMPLATE		"/dev/spidev%d.%d"
  #define DEFAULT_SPI_BUS			0
  #define DEFAULT_SPI_CS_LINE		0
  #define DEFAULT_SPI_MODE		SPI_MODE_0
  #define DEFAULT_SPI_BITS_PER_WORD	8
  #define DEFAULT_SPI_SPEED		1500000
  #define DEFAULT_SPI_DELAY_USECS		0
  
  struct spi_config {
  	int bus;
  	int cs_line;
  	uint8_t mode;
  	uint32_t speed;
  	uint8_t bits;
  	uint16_t delay;
  };
  
  static const struct spi_config default_spi_config = {
  	.bus		= DEFAULT_SPI_BUS,
  	.cs_line	= DEFAULT_SPI_CS_LINE,
  	.mode		= DEFAULT_SPI_MODE,
  	.speed		= DEFAULT_SPI_SPEED,
  	.bits		= DEFAULT_SPI_BITS_PER_WORD,
  	.delay		= DEFAULT_SPI_DELAY_USECS,
  };
  
  struct spi_ctx {
  	int fd;
  	struct spi_config config;
  };
  
  /* create SPI context with given configuration, returns NULL on failure */
  extern struct spi_ctx *spi_init(struct spi_config *config);
  /* close descriptor and free resources */
  extern void spi_exit(struct spi_ctx *ctx);
  /* process RX/TX transfer, ensure buffers are long enough */
  extern bool spi_transfer(struct spi_ctx *ctx, uint8_t *txbuf,
  			 uint8_t *rxbuf, int len);
  
  #endif /* SPI_CONTEXT_H */
  

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