sdapp: tool to measure raw block I/O performance

will destructively write to the first 100 MB (+2048 byte offset)
of the SD card.

sdapp/rawperf.c

@@ -0,0 +1,65 @@
+#include <r0ketlib/display.h>
+#include <r0ketlib/print.h>
+#include <r0ketlib/keyin.h>
+#include <r0ketlib/itoa.h>
+
+#include <rad1olib/pins.h>
+#include <libopencm3/lpc43xx/gpio.h>
+#include <libopencm3/lpc43xx/scu.h>
+
+#include <rad1olib/systick.h>
+#include <rad1olib/sdmmc.h>
+#include <lpcapi/sdif_18xx_43xx.h>
+#include <lpcapi/sdmmc_18xx_43xx.h>
+#include <lpcapi/chip_lpc43xx.h>
+
+#include <r0ketlib/fs_util.h>
+
+static uint8_t buf[4096];
+//# MENU rawperf
+void menu_rawperf(void){
+    lcdClear();
+
+    sdmmc_setup();
+    uint32_t r = sdmmc_acquire();
+
+    if(!r) {
+        lcdPrintln("No SD card found.");
+        lcdDisplay();
+        getInputWait();
+        return;
+    }
+    lcdPrintln("SD card raw perf:");
+    lcdPrintln("expect to lose the");
+    lcdPrintln("first 100 MB and");
+    lcdPrintln("press btn to cont.");
+    lcdDisplay();
+    getInputWait();
+
+    lcdPrintln("ms to write 100MB:");
+    lcdDisplay();
+    uint32_t write_t = _timectr;
+    for(int i=100*1024*1024/4096; i>0; i--) {
+        if(i%1024 == 0) TOGGLE(LED2);
+		Chip_SDMMC_WriteBlocks(LPC_SDMMC, buf, 4+(i*8), 8);
+    }
+    write_t = _timectr - write_t;
+
+    lcdPrintln(IntToStr(write_t, 10, 0));
+    lcdPrintln("ms to read 100MB:");
+    lcdDisplay();
+    uint32_t read_t = _timectr;
+    for(int i=100*1024*1024/4096; i>0; i--) {
+        if(i%1024 == 0) TOGGLE(LED2);
+		Chip_SDMMC_ReadBlocks(LPC_SDMMC, buf, 4+(i*8), 8);
+    }
+    read_t = _timectr - read_t;
+
+    lcdPrintln(IntToStr(read_t, 10, 0));
+    lcdPrintln("press button");
+    lcdDisplay();
+    getInputWait();
+
+    lcdPrintln("goodbye!");
+    lcdDisplay();
+}