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