L6470 SPI daisy chain support (#12895)

Marlin/src/core/enum.h

@@ -43,6 +43,10 @@ enum AxisEnum : unsigned char {
   NO_AXIS   = 0xFF
 };
 
+#if HAS_DRIVER(L6470)
+  enum L6470_driver_enum : unsigned char { X, Y, Z, X2, Y2, Z2, Z3, E0, E1, E2, E3, E4, E5 };
+#endif
+
 #define LOOP_S_LE_N(VAR, S, N) for (uint8_t VAR=(S); VAR<=(N); VAR++)
 #define LOOP_S_L_N(VAR, S, N) for (uint8_t VAR=(S); VAR<(N); VAR++)
 #define LOOP_LE_N(VAR, N) LOOP_S_LE_N(VAR, 0, N)

Marlin/src/core/utility.cpp

@@ -441,3 +441,10 @@ void safe_delay(millis_t ms) {
   }
 
 #endif // DEBUG_LEVELING_FEATURE
+
+void print_bin(const uint16_t val) {
+  for (uint8_t i = 16; i--;) {
+    SERIAL_ECHO(TEST(val, i));
+    if (!(i & 0x3)) SERIAL_CHAR(' ');
+  }
+}

Marlin/src/core/utility.h

@@ -119,3 +119,5 @@ inline void serial_delay(const millis_t ms) {
 #if ENABLED(DEBUG_LEVELING_FEATURE)
   void log_machine_info();
 #endif
+
+void print_bin(const uint16_t val);