rt-thread/bsp/lpc176x/drivers/spi.h

#ifndef __LPC17XX_SPI_H__
#define __LPC17XX_SPI_H__

#include <stdint.h>
#include <stdbool.h>

// if not use FIFO, 	R: 600kB/s, W: 500kB/s
// if     use FIFO,   	R: 1.2MB/s, W: 800kB/s
#define USE_FIFO        1

/* bit-frequency = PCLK / (CPSDVSR * [SCR+1]), here SCR=0, PCLK=72MHz, must be even	*/
#define SPI_SPEED_20MHz		4	/* => 18MHz */
#define SPI_SPEED_25MHz		4	/* => 18MHz */
#define SPI_SPEED_400kHz  180	/* => 400kHz */

/* external functions */
void LPC17xx_SPI_Init (void);
void LPC17xx_SPI_DeInit( void );
void LPC17xx_SPI_Release (void);
void LPC17xx_SPI_SetSpeed (uint8_t speed);
void LPC17xx_SPI_Select (void);
void LPC17xx_SPI_DeSelect (void);
void LPC17xx_SPI_SendByte (uint8_t data);
uint8_t LPC17xx_SPI_RecvByte (void);

#if USE_FIFO
void LPC17xx_SPI_RecvBlock_FIFO (uint8_t *buff,	uint32_t btr);
void LPC17xx_SPI_SendBlock_FIFO (const uint8_t *buff);
#endif

#endif	// __LPC17XX_SPI_H__