Add STM32F1 support for SD-based EEPROM

Marlin/src/HAL/HAL_AVR/persistent_store_impl.cpp

@@ -9,13 +9,8 @@
 namespace HAL {
 namespace PersistentStore {
 
-bool access_start() {
-  return true;
-}
-
-bool access_finish(){
-  return true;
-}
+bool access_start() { return true; }
+bool access_finish() { return true; }
 
 bool write_data(int &pos, const uint8_t *value, uint16_t size, uint16_t *crc) {
   while (size--) {

Marlin/src/HAL/HAL_DUE/persistent_store_impl.cpp

@@ -11,14 +11,12 @@ extern void eeprom_flush(void);
 namespace HAL {
 namespace PersistentStore {
 
-bool access_start() {
-  return true;
-}
+bool access_start() { return true; }
 
-bool access_finish(){
-#if DISABLED(I2C_EEPROM) && DISABLED(SPI_EEPROM)
-  eeprom_flush();
-#endif
+bool access_finish() {
+  #if DISABLED(I2C_EEPROM) && DISABLED(SPI_EEPROM)
+    eeprom_flush();
+  #endif
   return true;
 }
 

Marlin/src/HAL/HAL_STM32F1/persistent_store_flash.cpp

@@ -54,7 +54,7 @@ bool access_start() {
   return true;
 }
 
-bool access_finish(){
+bool access_finish() {
   FLASH_Lock();
   firstWrite = false;
   return true;

Marlin/src/HAL/HAL_STM32F1/persistent_store_impl.cpp

@@ -44,37 +44,35 @@
 namespace HAL {
 namespace PersistentStore {
 
-#define CONFIG_FILE_NAME "eeprom.dat"
 #define HAL_STM32F1_EEPROM_SIZE 4096
 char HAL_STM32F1_eeprom_content[HAL_STM32F1_EEPROM_SIZE];
 
+char eeprom_filename[] = "eeprom.dat";
+
 bool access_start() {
   if (!card.cardOK) return false;
   int16_t bytes_read = 0;
-  const char eeprom_zero = 0xFF;
-  card.openFile((char *)CONFIG_FILE_NAME,true);
-  bytes_read = card.read (HAL_STM32F1_eeprom_content, HAL_STM32F1_EEPROM_SIZE);
-  if (bytes_read == -1) return false;
-  for (; bytes_read < HAL_STM32F1_EEPROM_SIZE; bytes_read++) {
+  constexpr char eeprom_zero = 0xFF;
+  card.openFile(eeprom_filename, true);
+  bytes_read = card.read(HAL_STM32F1_eeprom_content, HAL_STM32F1_EEPROM_SIZE);
+  if (bytes_read < 0) return false;
+  for (; bytes_read < HAL_STM32F1_EEPROM_SIZE; bytes_read++)
     HAL_STM32F1_eeprom_content[bytes_read] = eeprom_zero;
-  }
   card.closefile();
   return true;
 }
 
-bool access_finish(){
+bool access_finish() {
   if (!card.cardOK) return false;
-  int16_t bytes_written = 0;
-  card.openFile((char *)CONFIG_FILE_NAME,true);
-  bytes_written = card.write (HAL_STM32F1_eeprom_content, HAL_STM32F1_EEPROM_SIZE);
+  card.openFile(eeprom_filename, true);
+  int16_t bytes_written = card.write(HAL_STM32F1_eeprom_content, HAL_STM32F1_EEPROM_SIZE);
   card.closefile();
   return (bytes_written == HAL_STM32F1_EEPROM_SIZE);
 }
 
 bool write_data(int &pos, const uint8_t *value, uint16_t size, uint16_t *crc) {
-  for (int i = 0; i < size; i++) {
-    HAL_STM32F1_eeprom_content [pos + i] = value[i];
-  }
+  for (int i = 0; i < size; i++)
+    HAL_STM32F1_eeprom_content[pos + i] = value[i];
   crc16(crc, value, size);
   pos += size;
   return false;

Marlin/src/HAL/HAL_STM32F4/persistent_store_impl.cpp

@@ -33,7 +33,6 @@ namespace HAL {
 namespace PersistentStore {
 
 bool access_start() { return true; }
-
 bool access_finish() { return true; }
 
 bool write_data(int &pos, const uint8_t *value, uint16_t size, uint16_t *crc) {

Marlin/src/HAL/HAL_STM32F7/persistent_store_impl.cpp

@@ -33,13 +33,8 @@
 namespace HAL {
 namespace PersistentStore {
 
-bool access_start() {
-  return true;
-}
-
-bool access_finish(){
-  return true;
-}
+bool access_start() { return true; }
+bool access_finish() { return true; }
 
 bool write_data(int &pos, const uint8_t *value, uint16_t size, uint16_t *crc) {
   while (size--) {

Marlin/src/HAL/HAL_TEENSY35_36/persistent_store_impl.cpp

@@ -9,13 +9,8 @@
 namespace HAL {
 namespace PersistentStore {
 
-bool access_start() {
-  return true;
-}
-
-bool access_finish() {
-  return true;
-}
+bool access_start() { return true; }
+bool access_finish() { return true; }
 
 bool write_data(int &pos, const uint8_t *value, uint16_t size, uint16_t *crc) {
   while (size--) {

Marlin/src/sd/cardreader.h

@@ -121,6 +121,11 @@ public:
   FORCE_INLINE uint8_t percentDone() { return (isFileOpen() && filesize) ? sdpos / ((filesize + 99) / 100) : 0; }
   FORCE_INLINE char* getWorkDirName() { workDir.getFilename(filename); return filename; }
 
+  #if defined(__STM32F1__) && ENABLED(EEPROM_SETTINGS) && DISABLED(FLASH_EEPROM_EMULATION)
+    FORCE_INLINE int16_t read(void* buf, uint16_t nbyte) { return file.isOpen() ? file.read(buf, nbyte) : -1; }
+    FORCE_INLINE int16_t write(void* buf, uint16_t nbyte) { return file.isOpen() ? file.write(buf, nbyte) : -1; }
+  #endif
+
   Sd2Card& getSd2Card() { return sd2card; }
 
   #if ENABLED(AUTO_REPORT_SD_STATUS)