backup_ram.cpp

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/**
 * @file    backup_ram.cpp
 *
 * @date Dec 19, 2017
 */
 
#include "backup_ram.h"
 
uint32_t backupRamLoad(backup_ram_e idx) {
#if HAL_USE_RTC
    switch (idx) {
    case backup_ram_e::StepperPosition:
        return RTCD1.rtc->BKP0R & 0xffff;
    case backup_ram_e::IgnCounter:
        return (RTCD1.rtc->BKP0R >> 16) & 0xff;
    default:
        criticalError("Invalid backup ram idx %d", (int)idx);
        return 0;
    }
#else
    return 0;
#endif /* HAL_USE_RTC */
}
 
void backupRamSave(backup_ram_e idx, uint32_t value) {
#if HAL_USE_RTC
    switch (idx) {
    case backup_ram_e::StepperPosition:
        RTCD1.rtc->BKP0R = (RTCD1.rtc->BKP0R & ~0x0000ffff) | (value & 0xffff);
        break;
    case backup_ram_e::IgnCounter:
        RTCD1.rtc->BKP0R = (RTCD1.rtc->BKP0R & ~0x00ff0000) | ((value & 0xff) << 16);
        break;
    default:
        criticalError("Invalid backup ram idx %d, value %lx", (int)idx, value);
        break;
    }
#endif /* HAL_USE_RTC */
}
 
#if !defined(AT32F4XX)
 
void backupRamFlush(void) {
    // nothing to do here, in STM32 all data is saved instantaneously
}
 
// STM32 only has 4k bytes of backup SRAM
static_assert(sizeof(BackupSramData) <= 4096);
 
static BKUP_RAM_NOINIT BackupSramData backupSramData;
 
BackupSramData* getBackupSram() {
    return &backupSramData;
}
 
#endif