/* sd2snes - SD card based universal cartridge for the SNES Copyright (C) 2009-2010 Maximilian Rehkopf This file was adapted from sd2iec, written by Ingo Korb. Original copyright header follows: */ /* sd2iec - SD/MMC to Commodore serial bus interface/controller Copyright (C) 2007-2009 Ingo Korb Inspiration and low-level SD/MMC access based on code from MMC2IEC by Lars Pontoppidan et al., see sdcard.c|h and config.h. FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License only. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA spi.h: Definitions for the low-level SPI routines Based on original code by Lars Pontoppidan et al., see spi.c for full copyright details. */ #ifndef SPI_H #define SPI_H // function prototypes // SPI interface initializer void spiInit(void); // spiTransferByte(u08 data) waits until the SPI interface is ready // and then sends a single byte over the SPI port. The function also // returns the byte that was received during transmission. uint8_t spiTransferByte(uint8_t data); // spiTransferLong(u08 data) waits until the SPI interface is ready // and then sends the long with MSB first over the SPI port. uint32_t spiTransferLong(uint32_t data); // Macros for setting slave select: #ifdef CONFIG_TWINSD # define SPI_SS_HIGH(card) do { \ if (card == 0) { \ SPI_PORT |= SPI_SS; \ } else { \ SD2_PORT |= SD2_CS; \ } \ } while (0) #define SPI_SS_LOW(card) do { \ if (card == 0) { \ SPI_PORT &= (uint8_t)~SPI_SS; \ } else { \ SD2_PORT &= (uint8_t)~SD2_CS; \ } \ } while (0) #else # define SPI_SS_HIGH(card) SPI_PORT |= SPI_SS # define SPI_SS_LOW(card) SPI_PORT &= (uint8_t)~SPI_SS #endif #endif