From 75e1e7a5e26491e942fb2b25f518d8e2e3112721 Mon Sep 17 00:00:00 2001
From: inmarket <andrewh@inmarket.com.au>
Date: Fri, 15 Aug 2014 02:22:02 +1000
Subject: Add GFILE support for PetitFS (a very tiny FAT implementation)

---
 src/gfile/petitfs_chibios_diskio.c | 82 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 src/gfile/petitfs_chibios_diskio.c

(limited to 'src/gfile/petitfs_chibios_diskio.c')

diff --git a/src/gfile/petitfs_chibios_diskio.c b/src/gfile/petitfs_chibios_diskio.c
new file mode 100644
index 00000000..dda3f6fc
--- /dev/null
+++ b/src/gfile/petitfs_chibios_diskio.c
@@ -0,0 +1,82 @@
+/*-----------------------------------------------------------------------*/
+/* Low level disk I/O module skeleton for FatFs     (C)ChaN, 2007        */
+/*-----------------------------------------------------------------------*/
+/* This is a stub disk I/O module that acts as front end of the existing */
+/* disk I/O modules and attach it to FatFs module with common interface. */
+/*-----------------------------------------------------------------------*/
+
+#include "gfx.h"
+
+#if GFX_USE_GFILE && GFILE_NEED_PETITFS && GFX_USE_OS_CHIBIOS
+
+#include "petitfs_wrapper.h"
+
+#include <string.h>
+
+#if HAL_USE_MMC_SPI && HAL_USE_SDC
+#error "cannot specify both MMC_SPI and SDC drivers"
+#endif
+
+#if HAL_USE_MMC_SPI
+extern MMCDriver MMCD1;
+#elif HAL_USE_SDC
+extern SDCDriver SDCD1;
+#else
+#error "MMC_SPI or SDC driver must be specified"
+#endif
+
+/*-----------------------------------------------------------------------*/
+/* Initialize a Drive                                                    */
+
+DSTATUS disk_initialize (void) {
+#if HAL_USE_MMC_SPI
+    /* It is initialized externally, just reads the status.*/
+    if (blkGetDriverState(&MMCD1) != BLK_READY)
+    	return STA_NOINIT;
+#else
+    /* It is initialized externally, just reads the status.*/
+    if (blkGetDriverState(&SDCD1) != BLK_READY)
+    	return STA_NOINIT;
+#endif
+    // All good
+	return 0;
+}
+
+/*-----------------------------------------------------------------------*/
+/* Read Part Sector(s)                                                        */
+
+static BYTE		sectBuf[512];
+static DWORD	sectpos = -1;
+
+DRESULT disk_readp (
+		BYTE* buff,    /* [OUT] Pointer to the read buffer */
+		DWORD sector,  /* [IN]  Sector number */
+		UINT offset,   /* [IN]  Byte offset in the sector to start to read */
+		UINT count     /* [IN]  Number of bytes to read */
+		) {
+
+	if (sector != sectpos) {
+		#if HAL_USE_MMC_SPI
+			if (blkGetDriverState(&MMCD1) != BLK_READY)
+				return RES_NOTRDY;
+			if (mmcStartSequentialRead(&MMCD1, sector))
+				return RES_ERROR;
+			if (mmcSequentialRead(&MMCD1, sectBuf))
+				return RES_ERROR;
+			if (mmcStopSequentialRead(&MMCD1))
+				return RES_ERROR;
+		#else
+			if (blkGetDriverState(&SDCD1) != BLK_READY)
+				return RES_NOTRDY;
+			if (sdcRead(&SDCD1, sector, sectBuf, 1))
+				return RES_ERROR;
+		#endif
+			sectpos = sector;
+	}
+	memcpy(buff, sectBuf + offset, count);
+	return RES_OK;
+}
+
+#endif // GFX_USE_GFILE && GFILE_NEED_PETITFS && GFX_USE_OS_CHIBIOS
+
+
-- 
cgit v1.2.3