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Diffstat (limited to 'digital/avr/modules/spi/spi_hard.h')
-rw-r--r--digital/avr/modules/spi/spi_hard.h63
1 files changed, 63 insertions, 0 deletions
diff --git a/digital/avr/modules/spi/spi_hard.h b/digital/avr/modules/spi/spi_hard.h
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+++ b/digital/avr/modules/spi/spi_hard.h
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+#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);
+
+/** 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 */