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Update PD to support awareness of having inductor for DCDC op

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+ fix voltage divider to be more on point
+ Create adjustment for thermal mass causes overshoot
This commit is contained in:
Ben V. Brown
2021-05-03 22:36:25 +10:00
parent dd5daf51e3
commit ee12c99d9e
7 changed files with 54 additions and 25 deletions
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20
source/Core/Drivers/FUSB302/policy_engine_user.cpp
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@@ -6,6 +6,7 @@
*/
#include "BSP_PD.h"
#include "configuration.h"
#include "main.hpp"
#include "pd.h"
#include "policy_engine.h"
@@ -60,6 +61,7 @@ bool PolicyEngine::pdbs_dpm_evaluate_capability(const union pd_msg *capabilities
int bestIndexVoltage = 0;
int bestIndexCurrent = 0;
bool bestIsPPS = false;
powerSupplyWattageLimit = 0;
for (uint8_t i = 0; i < numobj; i++) {
/* If we have a fixed PDO, its V equals our desired V, and its I is
* at least our desired I */
@@ -72,7 +74,15 @@ bool PolicyEngine::pdbs_dpm_evaluate_capability(const union pd_msg *capabilities
int current_a_x100 = PD_PDO_SRC_FIXED_CURRENT_GET(capabilities->obj[i]); // current in 10mA units
int min_resistance_ohmsx10 = voltage_mv / current_a_x100;
if (voltage_mv <= (USB_PD_VMAX * 1000)) {
if (min_resistance_ohmsx10 <= tipResistance) {
#ifdef MODEL_HAS_DCDC
// If this device has step down DC/DC inductor to smooth out current spikes
// We can instead ignore resistance and go for max voltage we can accept
if (voltage_mv <= (USB_PD_VMAX * 1000)) {
min_resistance_ohmsx10 = tipResistance;
}
#endif
// Fudge of 0.5 ohms to round up a little to account for other losses
if (min_resistance_ohmsx10 <= (tipResistance + 5)) {
// This is a valid power source we can select as
if (voltage_mv > bestIndexVoltage || bestIndex == 0xFF) {
// Higher voltage and valid, select this instead
@@ -80,6 +90,10 @@ bool PolicyEngine::pdbs_dpm_evaluate_capability(const union pd_msg *capabilities
bestIndexVoltage = voltage_mv;
bestIndexCurrent = current_a_x100;
bestIsPPS = false;
#ifdef MODEL_HAS_DCDC
// set limiter for wattage
powerSupplyWattageLimit = (voltage_mv * current_a_x100) / 100 / 1000;
#endif
}
}
}
@@ -103,6 +117,10 @@ bool PolicyEngine::pdbs_dpm_evaluate_capability(const union pd_msg *capabilities
bestIndexVoltage = ideal_voltage_mv;
bestIndexCurrent = max_current;
bestIsPPS = true;
#ifdef MODEL_HAS_DCDC
// set limiter for wattage
powerSupplyWattageLimit = (ideal_voltage_mv * max_current) / 100 / 1000;
#endif
}
}
}