#ifndef spi_hard_h #define spi_hard_h /* spi_hard.h */ /* avr.spi - SPI AVR module. {{{ * * Copyright (C) 2008 NĂ©lio Laranjeiro * * APBTeam: * Web: http://apbteam.org/ * Email: team AT apbteam DOT org * * 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; either version 2 of the License, or * (at your option) any later version. * * 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. * * }}} */ /** Hardware available clock rates. */ enum spi_fosc_t { SPI_FOSC_DIV2 = (_BV (SPI2X) << 8), SPI_FOSC_DIV4 = 0, SPI_FOSC_DIV8 = (_BV (SPI2X) << 8) | _BV (SPR0), SPI_FOSC_DIV16 = _BV (SPR0), SPI_FOSC_DIV32 = (_BV (SPI2X) << 8) | _BV (SPR1), SPI_FOSC_DIV64 = _BV (SPR1), SPI_FOSC_DIV128 = _BV (SPR1) | _BV (SPR0), }; /** Initialise SPI driver. * - master: slave or master mode * - mode: clock polarity and phase * - order: byte order (MSB or LSB) * - speed: clock rate (use SPI_FOSC_DIV*) */ #define spi_hard_init(master, mode, order, speed) \ spi_hard_init_ ((master) | (mode) | (order) | ((speed) & 0xff), \ (speed) >> 8) void spi_hard_init_ (uint8_t spcr, uint8_t spi2x); /** Uninitialise SPI driver, release GPIO (SS too!). */ void spi_hard_uninit (void); /** Send data. */ void spi_hard_send (uint8_t data); /** Receive data. */ uint8_t spi_hard_recv (void); /** Send and receive data. */ uint8_t spi_hard_send_and_recv (uint8_t data); #endif /* spi_hard_h */