Basic SD card functions

hardware/SD.c

@@ -0,0 +1,61 @@
+#include "SD.h"
+
+FATFS sdfs;    // FatFs work area 
+
+void sd_init(void) {
+    SPI_DDR |= _BV(SPI_MOSI) | _BV(SPI_CLK);
+    SPI_DDR &= ~(_BV(SPI_MISO));
+    SPCR = (1<<SPE) | (1<<MSTR) | (1<<SPR0);
+
+    SD_CS_DDR |= _BV(SD_CS_PIN);
+    SD_DETECT_DDR &= ~_BV(SD_DETECT_PIN);
+    SD_DETECT_PORT |= _BV(SD_DETECT_PIN); // Enable pull-up
+}
+
+// TODO: Remove this
+void sd_test(void) {
+    printf("Testing SD card functions\r\n");
+
+    FRESULT res = 0xFF;
+    while (res != 0) {
+        res = f_mount(&sdfs, "", 1);
+        printf("SD Detect: %d\r\n", (SD_DETECT_INPUT & _BV(SD_DETECT_PIN)));
+        printf("Res: %d\r\n", res);
+        delay_ms(500);
+    }
+
+    char str[12];
+    DWORD sn;
+    f_getlabel("", str, &sn);
+
+    printf("Label: %s, SN: %lu\r\n", str, sn);
+
+    FIL fil;       
+    char line[100];
+    FRESULT fr;    
+
+    
+    fr = f_open(&fil, "file1.txt", FA_READ);
+    printf("File open result: %d\r\n", fr);
+
+    
+    while (f_gets(line, sizeof line, &fil)) {
+        printf(line);
+    }
+
+    f_close(&fil);
+
+    printf("Returning from SD test\r\n");
+}
+
+// TODO: Get time from RTC or host
+// DWORD get_fattime (void)
+// {
+//     // Returns current time packed into a DWORD variable 
+//     return    ((DWORD)(2013 - 1980) << 25)  // Year 2013 
+//     | ((DWORD)8 << 21)              // Month 7 
+//     | ((DWORD)2 << 16)              // Mday 28 
+//     | ((DWORD)20 << 11)             // Hour 0..24
+//     | ((DWORD)30 << 5)              // Min 0 
+//     | ((DWORD)0 >> 1);              // Sec 0
+// }