Control Thread to Toggle Efuse States

[caiodasilva2005]

We need a system in which we can easily toggle various efuses to turn on different parts of the car at will. More importantly, we need a way to toggle different efuses based on Calypso CAN messages.

The following E-fuses should be enabled by default:

• EFUSE_DASHBOARD
• EFUSE_LV
• EFUSE_BATTBOX
• EFUSE_MC
• EFUSE_FANBATT ?? (We may need to do this conditionally based on pack temp)
  All the efuses above should be able to be completely toggled by CAN messages

The following E-fuses should be controlled by a control thread:
should turn on:

• EFUSE_PUMP1 if motor is higher than X temp
• EFUSE_PUMP2 if MC is higher than Y temp
• EFUSE_RADFAN if motor is higher than Z temp
  All these efuses should be able to be turned on my Calypseo but only turned off if conditions are safe to.

[caiodasilva2005]

You can use this as a reference: https://github.com/Northeastern-Electric-Racing/Cerberus/blob/develop/Core/Src/control.c

[medamawa]

Two questions:

1. Where should we define the threshold values?
   Similar to the previous implementation, would it make sense to define the constants in u_efuses.h ?

2. Does HAL_GPIO_ReadPin take time?
   To update eFuse state correctly and efficiently, we need to read eFuse pins. I'm concerned about the processing time since this would happen every iteration of the main loop.
   If reading GPIO pins is relatively expensive, I'm considering keeping a local cache of the eFuse states instead.

For example:

void efuse_update(void) {
    // Alternatively, we could store eFuse state using a global variable
    // updated in efuse_enable()/efuse_disable().
    // In that case, the problem is it's a global variable.
    static bool efuse_state[NUM_EFUSES];

    if (!efuse_state[EFUSE_PUMP1] && dti_get_motor_temp() > PUMP_UPPER_CONTROLLER_TEMP) {
         efuse_enable(EFUSE_PUMP1);
         efuse_state[EFUSE_PUMP1] = true;
    } else if (efuse_state[EFUSE_PUMP1] && dti_get_motor_temp() < PUMP_LOWER_CONTROLLER_TEMP) {
         efuse_disable(EFUSE_PUMP1);
         efuse_state[EFUSE_PUMP1] = false;
    }
    ...
}