chore(u3): add EEPROM support

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

libraries/EEPROM/src/utility/stm32_eeprom.c

@@ -235,8 +235,12 @@ void eeprom_buffer_flush(void)
   uint32_t pageError = 0;
 #if defined(FLASH_TYPEPROGRAM_QUADWORD)
   uint64_t data[2] = {0x0000};
+#else
+#if defined(STM32U3xx)
+  uint32_t dataAddr = 0;
 #else
   uint64_t data = 0;
+#endif
 #endif
 
   /* ERASING page */
@@ -261,10 +265,16 @@ void eeprom_buffer_flush(void)
         if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_QUADWORD, address, (uint32_t)data) == HAL_OK) {
           address += 16;
           offset += 16;
+#else
+#if defined(STM32U3xx)
+        dataAddr = (uint32_t)((uint8_t *)eeprom_buffer + offset);
+
+        if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address, dataAddr) == HAL_OK) {
 #else
         data = *((uint64_t *)((uint8_t *)eeprom_buffer + offset));
 
         if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address, data) == HAL_OK) {
+#endif
           address += 8;
           offset += 8;
 #endif