repo2/firmware_legacy/sd_direct/spi.c @ 1476
| 46 | markw | /*! \file spi.c \brief SPI interface driver. */
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//*****************************************************************************
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//
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// File Name : 'spi.c'
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// Title : SPI interface driver
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// Author : Pascal Stang - Copyright (C) 2000-2002
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// Created : 11/22/2000
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// Revised : 06/06/2002
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// Version : 0.6
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// Target MCU : Atmel AVR series
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// Editor Tabs : 4
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//
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// NOTE: This code is currently below version 1.0, and therefore is considered
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// to be lacking in some functionality or documentation, or may not be fully
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// tested. Nonetheless, you can expect most functions to work.
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//
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// ----------------------------------------------------------------------------
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// 17.8.2008
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// Bob!k & Raster, C.P.U.
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// Original code was modified especially for the SDrive device.
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// Some parts of code have been added, removed, rewrited or optimized due to
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// lack of MCU AVR Atmega8 memory.
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// ----------------------------------------------------------------------------
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//
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// This code is distributed under the GNU Public License
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// which can be found at http://www.gnu.org/licenses/gpl.txt
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//
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//*****************************************************************************
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#include "spi.h"
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#include "regs.h"
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#include "spi.h"
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#include "printf.h"
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int spi_slow; // 1 is slow
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| 864 | markw | enum {spi_slave_sd = 0, spi_slave_flash = 1};
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enum {spi_select_none = 6, spi_select_sd = 4, spi_select_flash = 2};
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int spi_select;
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| 46 | markw | int display;
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void updateSpiState()
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{
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| 864 | markw | *zpu_spi_state = (spi_slow<<3)|(spi_select);
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| 46 | markw | }
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// access routines
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void setSpiFast()
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{
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spi_slow = 0;
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updateSpiState();
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}
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void setSpiSlow()
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{
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spi_slow = 1;
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updateSpiState();
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}
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void set_spi_clock_freq() // avr handles spi clock?
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{
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setSpiFast();
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}
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void spiInit()
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{
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spiDisplay(0);
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spi_slow = 1;
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| 864 | markw | spi_select = spi_select_none|spi_slave_sd;
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| 46 | markw | updateSpiState();
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}
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| 864 | markw | void mmcChipSelect()
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| 46 | markw | {
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| 864 | markw | spi_select = spi_select_sd|spi_slave_sd;
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| 46 | markw | updateSpiState();
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}
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| 864 | markw | void mmcChipDeselect()
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{
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spi_select = spi_select_none|spi_slave_sd;
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updateSpiState();
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}
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void flashChipSelect()
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{
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spi_select = spi_select_flash|spi_slave_flash;
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updateSpiState();
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}
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void flashChipDeselect()
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{
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spi_select = spi_select_none|spi_slave_flash;
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updateSpiState();
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}
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| 46 | markw | u08 spiTransferByte(u08 data)
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{
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u08 res = 0;
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//debug("spiTransferByte");
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/*if (display!=0)
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{
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plotnext(hextoatarichar((data&0xf0) >> 4));
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plotnext(hextoatarichar((data&0xf)));
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}*/
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// send the given data
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*zpu_spi_data = data;
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// wait for transfer to complete
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while ((1&*zpu_spi_state) == 1);
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// return the received data
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res = *zpu_spi_data;
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if (display!=0)
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{
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//XXX plotnext(hextoatarichar((res&0xf0) >> 4));
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//XXX plotnext(hextoatarichar((res&0xf)));
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//plotnext(toatarichar(' '));
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}
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return res;
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}
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u08 spiTransferFF()
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{
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return spiTransferByte(0xFF);
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}
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void spiDisplay(int i)
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{
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display = i;
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}
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| 63 | markw | void spiReceiveData(u08 * from, u08 * to)
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{
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u32 from32 = (u32)from;
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u32 to32 = (u32)to;
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u32 val = to32<<16 | from32;
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*zpu_spi_dma = val;
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}
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