Merge pull request stm32duino#1129 from FRASTM/eeprom_l0

[WIP] stm32L0xx soc series has an embedded EEPROM

Author: fpistm

cores/arduino/stm32/stm32_eeprom.h

@@ -80,7 +80,25 @@ extern "C" {
  */
 #define FLASH_PAGE_SIZE     ((uint32_t)(16*1024)) /* 16kB page */
 #endif
+
+#if defined(DATA_EEPROM_BASE) || defined(FLASH_EEPROM_BASE)
+
+#if defined (DATA_EEPROM_END)
+#define E2END (DATA_EEPROM_END - DATA_EEPROM_BASE)
+#elif defined (DATA_EEPROM_BANK2_END)
+/* assuming two contiguous banks */
+#define DATA_EEPROM_END DATA_EEPROM_BANK2_END
+#define E2END (DATA_EEPROM_BANK2_END - DATA_EEPROM_BASE)
+#elif defined (FLASH_EEPROM_END)
+#define DATA_EEPROM_BASE FLASH_EEPROM_BASE
+#define DATA_EEPROM_END FLASH_EEPROM_END
+#define E2END (DATA_EEPROM_END - DATA_EEPROM_BASE)
+#endif /* __EEPROM_END */
+
+#else /* _EEPROM_BASE */
 #define E2END (FLASH_PAGE_SIZE - 1)
+#endif /* _EEPROM_BASE */
+
 #endif
 
 /* Exported macro ------------------------------------------------------------*/
@@ -89,10 +107,12 @@ extern "C" {
 uint8_t eeprom_read_byte(const uint32_t pos);
 void eeprom_write_byte(uint32_t pos, uint8_t value);
 
+#if !defined(DATA_EEPROM_BASE)
 void eeprom_buffer_fill();
 void eeprom_buffer_flush();
 uint8_t eeprom_buffered_read_byte(const uint32_t pos);
 void eeprom_buffered_write_byte(uint32_t pos, uint8_t value);
+#endif /* ! DATA_EEPROM_BASE */
 
 #ifdef __cplusplus
 }

libraries/SrcWrapper/src/stm32/stm32_eeprom.c

@@ -42,8 +42,8 @@ extern "C" {
 /* Be able to change FLASH_BANK_NUMBER to use if relevant */
 #if !defined(FLASH_BANK_NUMBER) &&\
     (defined(STM32F0xx) || defined(STM32F1xx) || defined(STM32G4xx) ||\
-     defined(STM32H7xx) || defined(STM32L1xx) || defined(STM32L4xx))
-/* Fo STM32F0xx, FLASH_BANK_1 is not defined only FLASH_BANK1_END is defined */
+     defined(STM32H7xx) || defined(STM32L4xx))
+/* For STM32F0xx, FLASH_BANK_1 is not defined only FLASH_BANK1_END is defined */
 #if defined(STM32F0xx)
 #define FLASH_BANK_1 1U
 #endif
@@ -58,7 +58,7 @@ extern "C" {
 #endif /* !FLASH_BANK_NUMBER */
 
 /* Be able to change FLASH_DATA_SECTOR to use if relevant */
-#if defined(STM32F2xx) || defined(STM32F4xx) || defined(STM32F7xx)  ||\
+#if defined(STM32F2xx) || defined(STM32F4xx) || defined(STM32F7xx) ||\
     defined(STM32H7xx)
 #if !defined(FLASH_DATA_SECTOR)
 #define FLASH_DATA_SECTOR   ((uint32_t)(FLASH_SECTOR_TOTAL - 1))
@@ -77,8 +77,8 @@ extern "C" {
 #endif /* !FLASH_PAGE_NUMBER */
 
 /* Be able to change FLASH_END to use */
-#if !defined(FLASH_END) && !defined(STM32L0xx)
-#if defined (STM32F0xx) || defined (STM32F1xx) || defined(STM32L1xx)
+#if !defined(FLASH_END)
+#if defined (STM32F0xx) || defined (STM32F1xx)
 #if defined (FLASH_BANK2_END) && (FLASH_BANK_NUMBER == FLASH_BANK_2)
 #define FLASH_END  FLASH_BANK2_END
 #elif defined (FLASH_BANK1_END) && (FLASH_BANK_NUMBER == FLASH_BANK_1)
@@ -117,6 +117,8 @@ static inline uint32_t get_flash_end(void)
 #define FLASH_END  ((uint32_t)(FLASH_BASE + (((FLASH_PAGE_NUMBER +1) * FLASH_PAGE_SIZE))-1))
 #elif defined(EEPROM_RETRAM_MODE)
 #define FLASH_END  ((uint32_t)(EEPROM_RETRAM_START_ADDRESS + EEPROM_RETRAM_MODE_SIZE -1))
+#elif defined(DATA_EEPROM_END)
+#define FLASH_END DATA_EEPROM_END
 #endif
 #ifndef FLASH_END
 #error "FLASH_END could not be defined"
@@ -130,9 +132,7 @@ static inline uint32_t get_flash_end(void)
  * in order to prevent overwritting
  * program data
  */
-#if defined(STM32L0xx)
-#define FLASH_BASE_ADDRESS  ((uint32_t)(DATA_EEPROM_BASE))
-#elif defined(EEPROM_RETRAM_MODE)
+#if defined(EEPROM_RETRAM_MODE)
 #define FLASH_BASE_ADDRESS  EEPROM_RETRAM_START_ADDRESS
 #else
 #define FLASH_BASE_ADDRESS  ((uint32_t)((FLASH_END + 1) - FLASH_PAGE_SIZE))
@@ -142,7 +142,9 @@ static inline uint32_t get_flash_end(void)
 #endif
 #endif /* FLASH_BASE_ADDRESS */
 
+#if !defined(DATA_EEPROM_BASE)
 static uint8_t eeprom_buffer[E2END + 1] __attribute__((aligned(8))) = {0};
+#endif
 
 /**
   * @brief  Function reads a byte from emulated eeprom (flash)
@@ -151,8 +153,17 @@ static uint8_t eeprom_buffer[E2END + 1] __attribute__((aligned(8))) = {0};
   */
 uint8_t eeprom_read_byte(const uint32_t pos)
 {
+#if defined(DATA_EEPROM_BASE)
+  __IO uint8_t data = 0;
+  if (pos <= (DATA_EEPROM_END - DATA_EEPROM_BASE)) {
+    /* with actual EEPROM, pos is a relative address */
+    data = *(__IO uint8_t *)(DATA_EEPROM_BASE + pos);
+  }
+  return (uint8_t)data;
+#else
   eeprom_buffer_fill();
   return eeprom_buffered_read_byte(pos);
+#endif /* _EEPROM_BASE */
 }
 
 /**
@@ -163,10 +174,22 @@ uint8_t eeprom_read_byte(const uint32_t pos)
   */
 void eeprom_write_byte(uint32_t pos, uint8_t value)
 {
+#if defined(DATA_EEPROM_BASE)
+  /* with actual EEPROM, pos is a relative address */
+  if (pos <= (DATA_EEPROM_END - DATA_EEPROM_BASE)) {
+    if (HAL_FLASHEx_DATAEEPROM_Unlock() == HAL_OK) {
+      HAL_FLASHEx_DATAEEPROM_Program(FLASH_TYPEPROGRAMDATA_BYTE, (pos + DATA_EEPROM_BASE), (uint32_t)value);
+      HAL_FLASHEx_DATAEEPROM_Lock();
+    }
+  }
+#else
   eeprom_buffered_write_byte(pos, value);
   eeprom_buffer_flush();
+#endif /* _EEPROM_BASE */
 }
 
+#if !defined(DATA_EEPROM_BASE)
+
 /**
   * @brief  Function reads a byte from the eeprom buffer
   * @param  pos : address to read
@@ -224,8 +247,8 @@ void eeprom_buffer_flush(void)
   uint32_t address = FLASH_BASE_ADDRESS;
   uint32_t address_end = FLASH_BASE_ADDRESS + E2END;
 #if defined (STM32F0xx) || defined (STM32F1xx) || defined (STM32F3xx) || \
-    defined (STM32G0xx) || defined (STM32G4xx) || defined (STM32L0xx) || \
-    defined (STM32L1xx) || defined (STM32L4xx) || defined (STM32WBxx)
+    defined (STM32G0xx) || defined (STM32G4xx) || \
+    defined (STM32L4xx) || defined (STM32WBxx)
   uint32_t pageError = 0;
   uint64_t data = 0;
 
@@ -243,38 +266,20 @@ void eeprom_buffer_flush(void)
   EraseInitStruct.NbPages = 1;
 
   if (HAL_FLASH_Unlock() == HAL_OK) {
-#if defined(STM32L0xx)
-    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | \
-                           FLASH_FLAG_SIZERR | FLASH_FLAG_OPTVERR | FLASH_FLAG_RDERR | \
-                           FLASH_FLAG_FWWERR | FLASH_FLAG_NOTZEROERR);
-#elif defined(STM32L1xx)
-#if defined(FLASH_SR_RDERR)
-    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | \
-                           FLASH_FLAG_SIZERR | FLASH_FLAG_OPTVERR | FLASH_FLAG_RDERR);
-#else
-    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | \
-                           FLASH_FLAG_SIZERR | FLASH_FLAG_OPTVERR);
-#endif
-#elif defined (STM32G0xx) || defined (STM32G4xx) || defined (STM32L4xx) || \
+#if defined (STM32G0xx) || defined (STM32G4xx) || defined (STM32L4xx) || \
       defined (STM32WBxx)
     __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS);
 #else
     __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_WRPERR | FLASH_FLAG_PGERR);
 #endif
     if (HAL_FLASHEx_Erase(&EraseInitStruct, &pageError) == HAL_OK) {
       while (address <= address_end) {
-#if defined(STM32L0xx) || defined(STM32L1xx)
-        memcpy(&data, eeprom_buffer + offset, sizeof(uint32_t));
-        if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, data) == HAL_OK) {
-          address += 4;
-          offset += 4;
-#else
+
         data = *((uint64_t *)((uint8_t *)eeprom_buffer + offset));
 
         if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address, data) == HAL_OK) {
           address += 8;
           offset += 8;
-#endif
         } else {
           address = address_end + 1;
         }
@@ -326,6 +331,8 @@ void eeprom_buffer_flush(void)
 
 #endif /* defined(EEPROM_RETRAM_MODE) */
 
+#endif /* ! DATA_EEPROM_BASE */
+
 #ifdef __cplusplus
 }
 #endif