Diff: USBMSD_RAM.cpp

Revision:

5:eebd06a7ddf0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBMSD_RAM.cpp	Wed Mar 26 07:45:40 2014 +0000
@@ -0,0 +1,90 @@
+/** This library is based on the USBMSD_SD library.
+ *  Modifications for using RAM were made by avnisha
+ *  Only modifications doen by Dwayne Dilbeck were to remove the SD functions, and change the RAM location to the Ethernet RAM 
+ */
+
+
+#include "USBMSD_RAM.h"
+#include "mbed_debug.h"
+
+#define SD_COMMAND_TIMEOUT 5000
+#define SD_DBG             0
+#define BLOCKS  32
+#define FS  BLOCKS*512
+
+LocalFileSystem local("local"); 
+
+char    s0[FS] __attribute__((section("AHBSRAM1")));
+char    s1[FS] __attribute__((section("AHBSRAM0")));
+int     status = 1;
+
+USBMSD_RAM::USBMSD_RAM(PinName mosi, PinName miso, PinName sclk, PinName cs) :
+    _spi(mosi, miso, sclk), _cs(cs) {
+    _cs = 1;
+    
+    printf("cons\n");
+    connect();
+}
+
+int USBMSD_RAM::disk_initialize() { 
+
+    printf("ini\n");
+    status--;
+    return 0;
+}
+
+int USBMSD_RAM::disk_write(const uint8_t *buffer, uint64_t block_number) {
+
+//
+// find the correct block and write
+//
+    int offset;
+    int i;
+    char *s;
+    
+    //printf("write\n");
+    if (block_number > (BLOCKS -1)) return 1;
+    offset = 512 * block_number;   
+    if (block_number < FS)
+        s=(char *)&s0;
+    else
+        s=(char *)&s1;
+    for (i = 0; i < 512; i++) {
+        s[offset + i] = buffer[i];  
+    }
+    return 0;
+}
+
+int USBMSD_RAM::disk_read(uint8_t *buffer, uint64_t block_number) {
+
+    int offset;
+    int i;
+    char *s;
+    
+    //printf("read\n");
+    if (block_number > (BLOCKS -1)) return 1;
+    offset = 512 * block_number;   
+    if (block_number < FS)
+        s=(char *)&s0;
+    else
+        s=(char *)&s1;
+    for (i = 0; i < 512; i++) {
+        buffer[i] = s[offset + i];  
+    }
+    return 0;
+}
+
+int USBMSD_RAM::disk_status() { 
+    printf("status\n");
+    return status; 
+}
+
+
+int USBMSD_RAM::disk_sync() { printf("sync\n"); return 0; }
+uint64_t USBMSD_RAM::disk_size() { 
+   printf("size\n"); 
+   printf("Location s0 : %x\n", &s0);
+   printf("Location s1 : %x\n", &s1);
+   return 2*FS;
+}
+uint64_t USBMSD_RAM::disk_sectors() { printf("sectors\n"); return BLOCKS; }