Fix STM32F1 SD-based EEPROM emulation (#13475)
If `openFile` is given `true`, then it has read-only access. Because all the writing occurs on the next line, this breaks SD card as EEPROM.
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@ -55,7 +55,7 @@ bool PersistentStore::access_start() {
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bool PersistentStore::access_finish() {
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if (!card.isDetected()) return false;
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card.openFile(eeprom_filename, true);
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card.openFile(eeprom_filename, false);
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int16_t bytes_written = card.write(HAL_STM32F1_eeprom_content, HAL_STM32F1_EEPROM_SIZE);
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card.closefile();
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return (bytes_written == HAL_STM32F1_EEPROM_SIZE);
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