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Handle non-EPR devices not encoding PPS correctly (#1911)

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Handle non EPR devices not encoding PPS correctly

By not trusting them at all.
This commit is contained in:
Ben V. Brown
2024-05-24 18:21:42 +10:00
committed by GitHub
parent f11290891e
commit 88d7a8e154
2 changed files with 76 additions and 53 deletions
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97
source/Core/Drivers/USBPD.cpp
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@@ -167,56 +167,67 @@ bool parseCapabilitiesArray(const uint8_t numCaps, uint8_t *bestIndex, uint16_t
}
}
}
} else if ((lastCapabilities[i] & PD_PDO_TYPE) == PD_PDO_TYPE_AUGMENTED && (((lastCapabilities[i] & PD_APDO_TYPE) == PD_APDO_TYPE_PPS)) && getSettingValue(SettingsOptions::PDVpdo)) {
// If this is a PPS slot, calculate the max voltage in the PPS range that can we be used and maintain
uint16_t max_voltage = PD_PAV2MV(PD_APDO_PPS_MAX_VOLTAGE_GET(lastCapabilities[i]));
// uint16_t min_voltage = PD_PAV2MV(PD_APDO_PPS_MIN_VOLTAGE_GET(lastCapabilities[i]));
uint16_t max_current = PD_PAI2CA(PD_APDO_PPS_CURRENT_GET(lastCapabilities[i])); // max current in 10mA units
// Using the current and tip resistance, calculate the ideal max voltage
// if this is range, then we will work with this voltage
// if this is not in range; then max_voltage can be safely selected
int ideal_voltage_mv = (tipResistance * max_current);
if (ideal_voltage_mv > max_voltage) {
ideal_voltage_mv = max_voltage; // constrain to what this PDO offers
} else if ((lastCapabilities[i] & PD_PDO_TYPE) == PD_PDO_TYPE_AUGMENTED && getSettingValue(SettingsOptions::PDVpdo)) {
bool sourceIsEPRCapable = lastCapabilities[0] & PD_PDO_SRC_FIXED_EPR_CAPABLE;
bool isPPS = false;
bool isAVS = false;
if (sourceIsEPRCapable) {
isPPS = (lastCapabilities[i] & PD_APDO_TYPE) == PD_APDO_TYPE_PPS;
isAVS = (lastCapabilities[i] & PD_APDO_TYPE) == PD_APDO_TYPE_AVS;
} else {
isPPS = true; // Assume PPS if no EPR support
}
if (ideal_voltage_mv > 20000) {
ideal_voltage_mv = 20000; // Limit to 20V as some advertise 21 but are not stable at 21
if (isPPS) {
// If this is a PPS slot, calculate the max voltage in the PPS range that can we be used and maintain
uint16_t max_voltage = PD_PAV2MV(PD_APDO_PPS_MAX_VOLTAGE_GET(lastCapabilities[i]));
// uint16_t min_voltage = PD_PAV2MV(PD_APDO_PPS_MIN_VOLTAGE_GET(lastCapabilities[i]));
uint16_t max_current = PD_PAI2CA(PD_APDO_PPS_CURRENT_GET(lastCapabilities[i])); // max current in 10mA units
// Using the current and tip resistance, calculate the ideal max voltage
// if this is range, then we will work with this voltage
// if this is not in range; then max_voltage can be safely selected
int ideal_voltage_mv = (tipResistance * max_current);
if (ideal_voltage_mv > max_voltage) {
ideal_voltage_mv = max_voltage; // constrain to what this PDO offers
}
if (ideal_voltage_mv > 20000) {
ideal_voltage_mv = 20000; // Limit to 20V as some advertise 21 but are not stable at 21
}
if (ideal_voltage_mv > (USB_PD_VMAX * 1000)) {
ideal_voltage_mv = (USB_PD_VMAX * 1000); // constrain to model max voltage safe to select
}
if (ideal_voltage_mv > *bestVoltage) {
*bestIndex = i;
*bestVoltage = ideal_voltage_mv;
*bestCurrent = max_current;
*bestIsPPS = true;
*bestIsAVS = false;
}
}
if (ideal_voltage_mv > (USB_PD_VMAX * 1000)) {
ideal_voltage_mv = (USB_PD_VMAX * 1000); // constrain to model max voltage safe to select
}
if (ideal_voltage_mv > *bestVoltage) {
*bestIndex = i;
*bestVoltage = ideal_voltage_mv;
*bestCurrent = max_current;
*bestIsPPS = true;
*bestIsAVS = false;
}
}
#ifdef POW_EPR
else if ((lastCapabilities[i] & PD_PDO_TYPE) == PD_PDO_TYPE_AUGMENTED && (((lastCapabilities[i] & PD_APDO_TYPE) == PD_APDO_TYPE_AVS)) && getSettingValue(SettingsOptions::PDVpdo)) {
uint16_t max_voltage = PD_PAV2MV(PD_APDO_AVS_MAX_VOLTAGE_GET(lastCapabilities[i]));
uint8_t max_wattage = PD_APDO_AVS_MAX_POWER_GET(lastCapabilities[i]);
else if (isAVS) {
uint16_t max_voltage = PD_PAV2MV(PD_APDO_AVS_MAX_VOLTAGE_GET(lastCapabilities[i]));
uint8_t max_wattage = PD_APDO_AVS_MAX_POWER_GET(lastCapabilities[i]);
// W = v^2/tip_resistance => Wattage*tip_resistance == Max_voltage^2
auto ideal_max_voltage = sqrtI((max_wattage * tipResistance) / 10) * 1000;
if (ideal_max_voltage > (USB_PD_VMAX * 1000)) {
ideal_max_voltage = (USB_PD_VMAX * 1000); // constrain to model max voltage safe to select
}
if (ideal_max_voltage > (max_voltage)) {
ideal_max_voltage = (max_voltage); // constrain to model max voltage safe to select
}
auto operating_current = (ideal_max_voltage / tipResistance); // Current in centiamps
// W = v^2/tip_resistance => Wattage*tip_resistance == Max_voltage^2
auto ideal_max_voltage = sqrtI((max_wattage * tipResistance) / 10) * 1000;
if (ideal_max_voltage > (USB_PD_VMAX * 1000)) {
ideal_max_voltage = (USB_PD_VMAX * 1000); // constrain to model max voltage safe to select
}
if (ideal_max_voltage > (max_voltage)) {
ideal_max_voltage = (max_voltage); // constrain to model max voltage safe to select
}
auto operating_current = (ideal_max_voltage / tipResistance); // Current in centiamps
if (ideal_max_voltage > *bestVoltage) {
*bestIndex = i;
*bestVoltage = ideal_max_voltage;
*bestCurrent = operating_current;
*bestIsAVS = true;
*bestIsPPS = false;
if (ideal_max_voltage > *bestVoltage) {
*bestIndex = i;
*bestVoltage = ideal_max_voltage;
*bestCurrent = operating_current;
*bestIsAVS = true;
*bestIsPPS = false;
}
}
}
#endif
}
}
// Now that the best index is known, set the current values
return *bestIndex != 0xFF; // have we selected one