wflib.c

00001 /*
00002   Plastic Logic EPD project on MSP430
00003 
00004   Copyright (C) 2014 Plastic Logic Limited
00005 
00006   This program is free software: you can redistribute it and/or modify
00007   it under the terms of the GNU General Public License as published by
00008   the Free Software Foundation, either version 3 of the License, or
00009   (at your option) any later version.
00010 
00011   This program is distributed in the hope that it will be useful,
00012   but WITHOUT ANY WARRANTY; without even the implied warranty of
00013   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014   GNU General Public License for more details.
00015 
00016   You should have received a copy of the GNU General Public License
00017   along with this program.  If not, see <http://www.gnu.org/licenses/>.
00018 */
00019 /*
00020  * wflib.c -- Waveform library management
00021  *
00022  * Authors:
00023  *   Guillaume Tucker <guillaume.tucker@plasticlogic.com>
00024  *
00025  */
00026 
00027 #include "wflib.h"
00028 
00029 #include <ChaN/ff.h>
00030 #define LOG_TAG "wflib"
00031 #include "utils.h"
00032 
00033 #define DATA_BUFFER_LENGTH 256
00034 
00035 static int pl_wflib_fatfs_xfer(struct pl_wflib *wflib, pl_wflib_wr_t wr,
00036                    void *ctx)
00037 {
00038     FIL *f = wflib->priv;
00039     size_t left = wflib->size;
00040 
00041 #ifdef VERBOSE
00042     LOG("pl_wflib_fatfs_xfer()");
00043 
00044     LOG("size: %lu", (unsigned long) left);
00045     LOG("f: %p", f);
00046     LOG("wr: %p", wr);
00047 #endif
00048 
00049     if (f_lseek(f, 0) != FR_OK)
00050         return -1;
00051 
00052     while (left) {
00053         uint8_t data[DATA_BUFFER_LENGTH];
00054         const size_t n = min(left, sizeof(data));
00055         size_t count;
00056 
00057         if ((f_read(f, data, n, &count) != FR_OK) || (count != n)) {
00058             LOG("Failed to read from file");
00059             return -1;
00060         }
00061         
00062         if (wr(ctx, data, n))
00063             return -1;
00064 
00065         left -= n;
00066     }
00067 
00068     return 0;
00069 }
00070 
00071 int pl_wflib_init_fatfs(struct pl_wflib *wflib, int *f, const char *path)
00072 {
00073     if (f_open((FIL *) f, path, FA_READ) != FR_OK) {
00074         LOG("Failed to open wflib: %s", path);
00075         return -1;
00076     }
00077 
00078     wflib->xfer = pl_wflib_fatfs_xfer;
00079     wflib->size = f_size((FIL *) f);
00080     wflib->priv = f;
00081 
00082 #ifdef VERBOSE
00083     LOG("wflib xfer: %p", wflib->xfer);
00084     LOG("wflib size: %lu", (unsigned long) wflib->size);
00085     LOG("wflib priv: %p", wflib->priv);
00086 
00087     LOG("FatFS (%s)", path);
00088 #endif
00089 
00090     return 0;
00091 }