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_STEPPER_POS:
        return RTCD1.rtc->BKP0R & 0xffff;
    case BACKUP_IGNITION_SWITCH_COUNTER:
        return (RTCD1.rtc->BKP0R >> 16) & 0xff;
    case BACKUP_CJ125_CALIBRATION_LAMBDA:
        return RTCD1.rtc->BKP1R & 0xffff;
    case BACKUP_CJ125_CALIBRATION_HEATER:
        return (RTCD1.rtc->BKP1R >> 16) & 0xffff;
// it is assembly code which reads this value
//  case DFU_JUMP_REQUESTED:
//      return RTCD1.rtc->BKP4R;
    default:
        firmwareError(OBD_PCM_Processor_Fault, "Invalid backup ram idx %d", 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_STEPPER_POS:
        RTCD1.rtc->BKP0R = (RTCD1.rtc->BKP0R & ~0x0000ffff) | (value & 0xffff);
        break;
    case BACKUP_IGNITION_SWITCH_COUNTER:
        RTCD1.rtc->BKP0R = (RTCD1.rtc->BKP0R & ~0x00ff0000) | ((value & 0xff) << 16);
        break;
    case BACKUP_CJ125_CALIBRATION_LAMBDA:
        RTCD1.rtc->BKP1R = (RTCD1.rtc->BKP1R & ~0x0000ffff) | (value & 0xffff);
        break;
    case BACKUP_CJ125_CALIBRATION_HEATER:
        RTCD1.rtc->BKP1R = (RTCD1.rtc->BKP1R & ~0xffff0000) | ((value & 0xffff) << 16);
        break;
// todo: start using this code
    case DFU_JUMP_REQUESTED:
        RTCD1.rtc->BKP4R = value;
        break;
    default:
        firmwareError(OBD_PCM_Processor_Fault, "Invalid backup ram idx %d, value 0x08x", idx, value);
        break;
    }
#endif /* HAL_USE_RTC */
}