[FL-1942] Applications: Display Test. u8g2 usage refactoring. #770

bootloader/targets/f7/furi-hal/furi-hal.c

@@ -1,7 +1,20 @@
 #include <furi-hal.h>
+#include <stm32wbxx_ll_utils.h>
 
 void furi_hal_init() {
     furi_hal_i2c_init();
     furi_hal_light_init();
     furi_hal_spi_init();
-}
+}
+
+void delay(float milliseconds) {
+    LL_mDelay((uint32_t)milliseconds);
+}
+
+void delay_us(float microseconds) {
+    microseconds = microseconds / 1000;
+    if(microseconds < 1) {
+        microseconds = 1;
+    }
+    LL_mDelay((uint32_t)microseconds);
+}