fixed ESP8266 issues

- added default eeprom code to mcu if RAM only mode is active
- fixed SPI typo
- fixed function return if EEPROM emulation address is invalid

uCNC/src/hal/mcus/esp8266/esp8266_arduino.cpp

@@ -977,7 +977,7 @@ extern "C"
 
 	bool mcu_spi_bulk_transfer(const uint8_t *out, uint8_t *in, uint16_t len)
 	{
-		SPI.transferBytes(out, int, len);
+		SPI.transferBytes(out, in, len);
 		return false;
 	}
 
@@ -1027,6 +1027,7 @@ extern "C"
 		if (NVM_STORAGE_SIZE <= address)
 		{
 			DBGMSG("EEPROM invalid address @ %u", address);
+			return;
 		}
 		EEPROM.write(address, value);
 	}

uCNC/src/hal/mcus/mcu.c

@@ -877,16 +877,16 @@ void __attribute__((weak)) mcu_io_init(void)
 #endif
 #endif
 #if ASSERT_PIN_IO(SPI2_CLK)
-mcu_config_output(SPI2_CLK);
+	mcu_config_output(SPI2_CLK);
 #endif
 #if ASSERT_PIN_IO(SPI2_SDI)
-mcu_config_output(SPI2_SDI);
+	mcu_config_output(SPI2_SDI);
 #endif
 #if ASSERT_PIN_IO(SPI2_SDO)
-mcu_config_output(SPI2_SDO);
+	mcu_config_output(SPI2_SDO);
 #endif
 #if ASSERT_PIN(SPI2_CS)
-mcu_config_output(SPI2_CS);
+	mcu_config_output(SPI2_CS);
 #endif
 
 #ifdef MCU_HAS_UART
@@ -932,6 +932,29 @@ void __attribute__((weak)) mcu_io_reset(void)
 }
 #endif
 
+// Non volatile memory
+/**
+ * gets a byte at the given EEPROM (or other non volatile memory) address of the MCU.
+ * */
+uint8_t __attribute__((weak)) mcu_eeprom_getc(uint16_t address)
+{
+	return 0;
+}
+
+/**
+ * sets a byte at the given EEPROM (or other non volatile memory) address of the MCU.
+ * */
+void __attribute__((weak)) mcu_eeprom_putc(uint16_t address, uint8_t value)
+{
+}
+
+/**
+ * flushes all recorded registers into the eeprom.
+ * */
+void __attribute__((weak)) mcu_eeprom_flush(void)
+{
+}
+
 // ISR
 // New uint8_t handle strategy
 // All ascii will be sent to buffer and processed later (including comments)