80f1688423
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14909 a1c6a512-1295-4272-9138-f99709370657
77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
/*
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* SPI interface driver for the DM320 SoC
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*
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* Copyright (C) 2007 shirour <mrobefan@gmail.com>
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* Copyright (C) 2007 Catalin Patulea <cat@vv.carleton.ca>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "system.h"
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#define GIO_TS_ENABLE (1<<2)
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#define clr_gio_enable() IO_GIO_BITSET1=GIO_TS_ENABLE
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#define set_gio_enable() IO_GIO_BITCLR1=GIO_TS_ENABLE
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int spi_block_transfer(const uint8_t *tx_bytes, unsigned int tx_size,
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uint8_t *rx_bytes, unsigned int rx_size)
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{
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/* Activate the slave select pin */
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set_gio_enable();
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while (tx_size--)
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{
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/* Send one byte */
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IO_SERIAL0_TX_DATA = *tx_bytes++;
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/* Wait until transfer finished */
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while (IO_SERIAL0_RX_DATA & 0x100);
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}
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while (rx_size--)
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{
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/* Make the clock tick */
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IO_SERIAL0_TX_DATA = 0;
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/* Wait until transfer finished */
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unsigned short data;
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while ((data = IO_SERIAL0_RX_DATA) & 0x100);
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*rx_bytes++ = data & 0xff;
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}
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clr_gio_enable();
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return 0;
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}
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void spi_init(void)
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{
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/* Set SCLK idle level = 0 */
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IO_SERIAL0_MODE |= (1<<10);
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/* Enable TX */
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IO_SERIAL0_TX_ENABLE = 0x0001;
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/* Set GIO 18 to output for touch screen slave enable */
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IO_GIO_DIR1&=~GIO_TS_ENABLE;
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clr_gio_enable();
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}
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