2 * FreeRTOS+FAT SL V1.0.1 (C) 2014 HCC Embedded
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4 * The FreeRTOS+FAT SL license terms are different to the FreeRTOS license
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7 * FreeRTOS+FAT SL uses a dual license model that allows the software to be used
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8 * under a standard GPL open source license, or a commercial license. The
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9 * standard GPL license (unlike the modified GPL license under which FreeRTOS
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10 * itself is distributed) requires that all software statically linked with
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11 * FreeRTOS+FAT SL is also distributed under the same GPL V2 license terms.
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12 * Details of both license options follow:
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14 * - Open source licensing -
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15 * FreeRTOS+FAT SL is a free download and may be used, modified, evaluated and
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16 * distributed without charge provided the user adheres to version two of the
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17 * GNU General Public License (GPL) and does not remove the copyright notice or
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18 * this text. The GPL V2 text is available on the gnu.org web site, and on the
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19 * following URL: http://www.FreeRTOS.org/gpl-2.0.txt.
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21 * - Commercial licensing -
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22 * Businesses and individuals who for commercial or other reasons cannot comply
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23 * with the terms of the GPL V2 license must obtain a commercial license before
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24 * incorporating FreeRTOS+FAT SL into proprietary software for distribution in
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25 * any form. Commercial licenses can be purchased from
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26 * http://shop.freertos.org/fat_sl and do not require any source files to be
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29 * FreeRTOS+FAT SL is distributed in the hope that it will be useful. You
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30 * cannot use FreeRTOS+FAT SL unless you agree that you use the software 'as
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31 * is'. FreeRTOS+FAT SL is provided WITHOUT ANY WARRANTY; without even the
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32 * implied warranties of NON-INFRINGEMENT, MERCHANTABILITY or FITNESS FOR A
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33 * PARTICULAR PURPOSE. Real Time Engineers Ltd. and HCC Embedded disclaims all
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34 * conditions and terms, be they implied, expressed, or statutory.
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36 * http://www.FreeRTOS.org
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37 * http://www.FreeRTOS.org/FreeRTOS-Plus
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41 #include "../../api/api_mdriver_ram.h"
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42 #include "config_mdriver_ram.h"
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43 #include "../../psp/include/psp_string.h"
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45 #include "../../version/ver_mdriver_ram.h"
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46 #if VER_MDRIVER_RAM_MAJOR != 1 || VER_MDRIVER_RAM_MINOR != 2
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47 #error Incompatible MDRIVER_RAM version number!
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50 /* The array used as the RAM disk storage. */
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51 static char ramdrv[ MDRIVER_RAM_VOLUME0_SIZE ];
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53 /* The F_DRIVER structure that is filled with the RAM disk versions of the read
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54 sector, write sector, etc. functions. */
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55 static F_DRIVER t_driver;
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57 static const unsigned long maxsector = MDRIVER_RAM_VOLUME0_SIZE / MDRIVER_RAM_SECTOR_SIZE;
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59 /* Disk not initialized yet. */
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60 static char in_use = 0;
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63 /****************************************************************************
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65 ***************************************************************************/
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66 static int ram_readsector ( F_DRIVER * driver, void * data, unsigned long sector )
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69 char * d = (char *)data;
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75 /* Check for valid sector. */
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76 if ( sector >= maxsector )
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78 return MDRIVER_RAM_ERR_SECTOR;
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83 return MDRIVER_RAM_ERR_NOTAVAILABLE;
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86 /* Locate offset into RAM disk for sector. */
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88 s += sector * MDRIVER_RAM_SECTOR_SIZE;
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89 len = MDRIVER_RAM_SECTOR_SIZE;
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91 #if MDRIVER_MEM_LONG_ACCESS
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92 if ( ( !( len & 3 ) ) && ( !( ( (long)d ) & 3 ) ) && ( !( ( (long)s ) & 3 ) ) )
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94 long * dd = (long *)d;
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95 long * ss = (long *)s;
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103 return MDRIVER_RAM_NO_ERROR;
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106 #endif /* if MDRIVER_MEM_LONG_ACCESS */
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114 return MDRIVER_RAM_NO_ERROR;
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117 /****************************************************************************
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119 ***************************************************************************/
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120 static int ram_writesector ( F_DRIVER * driver, void * data, unsigned long sector )
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123 char * s = (char *)data;
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129 /* Check for valid sector. */
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130 if ( sector >= maxsector )
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132 return MDRIVER_RAM_ERR_SECTOR;
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137 return MDRIVER_RAM_ERR_NOTAVAILABLE;
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140 /* Locate offset into RAM disk for sector. */
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142 d += sector * MDRIVER_RAM_SECTOR_SIZE;
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143 len = MDRIVER_RAM_SECTOR_SIZE;
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145 #if MDRIVER_MEM_LONG_ACCESS
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146 if ( ( !( len & 3 ) ) && ( !( ( (long)d ) & 3 ) ) && ( !( ( (long)s ) & 3 ) ) )
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148 long * dd = (long *)d;
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149 long * ss = (long *)s;
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158 return MDRIVER_RAM_NO_ERROR;
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160 #endif /* if MDRIVER_MEM_LONG_ACCESS */
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168 return MDRIVER_RAM_NO_ERROR;
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172 /****************************************************************************
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176 * determinate ramdrive physicals
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180 * driver - driver structure
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181 * phy - this structure has to be filled with physical information
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185 * error code or zero if successful
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187 ***************************************************************************/
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188 static int ram_getphy ( F_DRIVER * driver, F_PHY * phy )
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193 phy->number_of_sectors = maxsector;
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194 phy->bytes_per_sector = MDRIVER_RAM_SECTOR_SIZE;
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196 return MDRIVER_RAM_NO_ERROR;
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200 /****************************************************************************
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208 * driver_param - driver parameter
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210 ***************************************************************************/
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211 static void ram_release ( F_DRIVER * driver )
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216 /* Disk no longer in use. */
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221 /****************************************************************************
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225 * this init function has to be passed for highlevel to initiate the
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230 * driver_param - driver parameter
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234 * driver structure pointer
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236 ***************************************************************************/
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237 F_DRIVER * ram_initfunc ( unsigned long driver_param )
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239 ( void ) driver_param;
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244 (void)psp_memset( &t_driver, 0, sizeof( F_DRIVER ) );
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246 t_driver.readsector = ram_readsector;
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247 t_driver.writesector = ram_writesector;
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248 t_driver.getphy = ram_getphy;
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249 t_driver.release = ram_release;
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254 } /* ram_initfunc */
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