flash: add test code

STM32/libraries/HardwareTest/examples/FlashVariablesTest/FlashVariablesTest.ino

@@ -0,0 +1,62 @@
+/* Testing of writing random variables to Flash like EEPROM
+*
+* It uses RAM just for the test, and to see how the underlying storage changes when writing.
+*/
+
+#include "FlashVariables.h"
+
+RamFlashPage page0(64);
+RamFlashPage page1(64);
+
+// number of variables that can be stored
+#define VIRTUAL_STORAGE_LENGTH 4
+// 1 byte data
+#define DATA_BYTES 1
+
+FlashVariables<DATA_BYTES> vars(&page0, &page1);
+
+void setup() {
+    Serial.begin(115200);
+
+    delay(1000);
+    Serial.println("Press a key to test");
+}
+
+uint8_t check[VIRTUAL_STORAGE_LENGTH];
+
+void loop() {
+
+    while(Serial.read() == -1);
+
+    uint8_t data;
+
+    int address = random(VIRTUAL_STORAGE_LENGTH);
+    data = random(256);
+
+    Serial.printf("Set variable %d= %d\n", address, data);
+
+    check[address] = data;
+
+    if (!vars.write(address, &data)) {
+        Serial.printf("Failed to write");
+        while(1);
+    }
+
+    Serial.print("Page 0 content: ");
+    page0.print(Serial, 4);
+
+    Serial.print("Page 1 content: ");
+    page1.print(Serial, 4);
+    for(int i=0; i<VIRTUAL_STORAGE_LENGTH; i++) {
+        vars.read(i, &data);
+        Serial.printf("%d=%d ", i, data);
+
+        if (data != check[i]) {
+
+            Serial.printf("ERROR %d, %d != %d", i, check[i], data);
+            while(1);
+        }
+    }
+
+    printf("\n");
+}