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- /* sd2iec - SD/MMC to Commodore serial bus interface/controller
- Copyright (C) 2007-2010 Ingo Korb <ingo@akana.de>
- 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
- #define SSP_TFE 0 // Transmit FIFO empty
- #define SSP_TNF 1 // Transmit FIFO not full
- #define SSP_RNE 2 // Receive FIFO not empty
- #define SSP_RFF 3 // Receive FIFO full
- #define SSP_BSY 4 // Busy
- /* Low speed 400kHz for init, fast speed <=20MHz (MMC limit) */
- typedef enum { SPI_SPEED_FAST, SPI_SPEED_SLOW, SPI_SPEED_FPGA_FAST, SPI_SPEED_FPGA_SLOW } spi_speed_t;
- /* Pre-Initialize SPI interface (PCLK divider before PLL setup) */
- void spi_preinit( void );
- /* Initialize SPI interface */
- void spi_init( void );
- /* Transmit a single byte */
- void spi_tx_byte( uint8_t data );
- /* Transmit a single byte and return received data */
- uint8_t spi_txrx_byte( uint8_t data );
- /* Transmit a data block */
- void spi_tx_block( const void *data, unsigned int length );
- /* Receive a single byte */
- uint8_t spi_rx_byte( void );
- /* Receive a data block */
- void spi_rx_block( void *data, unsigned int length );
- /* wait for SPI TX FIFO to become empty */
- void spi_tx_sync( void );
- #endif
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