From 80f1688423eaad7a2ad9e4809331e192bcd0047d Mon Sep 17 00:00:00 2001 From: Jonathan Gordon Date: Sun, 30 Sep 2007 08:57:49 +0000 Subject: I got bullied in IRC by linuxstb and markun... git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14909 a1c6a512-1295-4272-9138-f99709370657 --- .../target/arm/tms320dm320/mrobe-500/spi-mr500.c | 77 ++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 firmware/target/arm/tms320dm320/mrobe-500/spi-mr500.c (limited to 'firmware/target/arm/tms320dm320/mrobe-500/spi-mr500.c') diff --git a/firmware/target/arm/tms320dm320/mrobe-500/spi-mr500.c b/firmware/target/arm/tms320dm320/mrobe-500/spi-mr500.c new file mode 100644 index 0000000000..c47ab8f6ed --- /dev/null +++ b/firmware/target/arm/tms320dm320/mrobe-500/spi-mr500.c @@ -0,0 +1,77 @@ +/* + * SPI interface driver for the DM320 SoC + * + * Copyright (C) 2007 shirour + * Copyright (C) 2007 Catalin Patulea + * + * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * 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., + * 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include "system.h" + +#define GIO_TS_ENABLE (1<<2) +#define clr_gio_enable() IO_GIO_BITSET1=GIO_TS_ENABLE +#define set_gio_enable() IO_GIO_BITCLR1=GIO_TS_ENABLE + +int spi_block_transfer(const uint8_t *tx_bytes, unsigned int tx_size, + uint8_t *rx_bytes, unsigned int rx_size) +{ + /* Activate the slave select pin */ + set_gio_enable(); + + while (tx_size--) + { + /* Send one byte */ + IO_SERIAL0_TX_DATA = *tx_bytes++; + + /* Wait until transfer finished */ + while (IO_SERIAL0_RX_DATA & 0x100); + } + + while (rx_size--) + { + /* Make the clock tick */ + IO_SERIAL0_TX_DATA = 0; + + /* Wait until transfer finished */ + unsigned short data; + while ((data = IO_SERIAL0_RX_DATA) & 0x100); + + *rx_bytes++ = data & 0xff; + } + + clr_gio_enable(); + + return 0; +} + +void spi_init(void) +{ + /* Set SCLK idle level = 0 */ + IO_SERIAL0_MODE |= (1<<10); + + /* Enable TX */ + IO_SERIAL0_TX_ENABLE = 0x0001; + + /* Set GIO 18 to output for touch screen slave enable */ + IO_GIO_DIR1&=~GIO_TS_ENABLE; + clr_gio_enable(); +} -- cgit v1.2.3