Refine EEPROM types / flags (#17772)

Marlin/src/HAL/STM32F1/HAL.h

@@ -248,19 +248,6 @@ static int freeMemory() {
 
 #pragma GCC diagnostic pop
 
-//
-// EEPROM
-//
-
-/**
- * TODO: Write all this EEPROM stuff. Can emulate EEPROM in flash as last resort.
- * Wire library should work for i2c EEPROMs.
- */
-void eeprom_write_byte(uint8_t *pos, unsigned char value);
-uint8_t eeprom_read_byte(uint8_t *pos);
-void eeprom_read_block(void *__dst, const void *__src, size_t __n);
-void eeprom_update_block(const void *__src, void *__dst, size_t __n);
-
 //
 // ADC
 //

Marlin/src/HAL/STM32F1/eeprom_wired.cpp

@@ -23,8 +23,11 @@
 
 #if USE_WIRED_EEPROM
 
+#include "../shared/eeprom_if.h"
 #include "../shared/eeprom_api.h"
 
+size_t PersistentStore::capacity()    { return E2END + 1; }
+
 bool PersistentStore::access_start() {
   #if ENABLED(SPI_EEPROM)
     #if SPI_CHAN_EEPROM1 == 1
@@ -70,7 +73,5 @@ bool PersistentStore::read_data(int &pos, uint8_t* value, size_t size, uint16_t
   return false;
 }
 
-size_t PersistentStore::capacity() { return E2END + 1; }
-
 #endif // USE_WIRED_EEPROM
 #endif // __STM32F1__

Marlin/src/HAL/STM32F1/inc/Conditionals_post.h

@@ -24,4 +24,6 @@
 // If no real EEPROM, Flash emulation, or SRAM emulation is available fall back to SD emulation
 #if USE_FALLBACK_EEPROM
   #define SDCARD_EEPROM_EMULATION
+#elif EITHER(I2C_EEPROM, SPI_EEPROM)
+  #define USE_SHARED_EEPROM 1
 #endif