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Rough tip resistance progress

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This commit is contained in:
Ben V. Brown
2022-05-23 21:42:56 +10:00
parent 226750df4c
commit 75b3f09438
8 changed files with 75 additions and 17 deletions
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11
source/Core/Drivers/USBPD.cpp
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@@ -13,9 +13,6 @@
#ifndef USB_PD_VMAX
#error Max PD Voltage must be defined
#endif
#ifndef TIP_RESISTANCE
#error Tip resistance must be defined
#endif
void ms_delay(uint32_t delayms) {
// Convert ms -> ticks
@@ -98,10 +95,10 @@ bool pdbs_dpm_evaluate_capability(const pd_msg *capabilities, pd_msg *request) {
#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
min_resistance_ohmsx10 = TIP_RESISTANCE;
min_resistance_ohmsx10 = getTipResitanceX10();
#endif
// Fudge of 0.5 ohms to round up a little to account for other losses
if (min_resistance_ohmsx10 <= (TIP_RESISTANCE + 5)) {
if (min_resistance_ohmsx10 <= (getTipResitanceX10() + 5)) {
// This is a valid power source we can select as
if ((voltage_mv > bestIndexVoltage) || bestIndex == 0xFF) {
// Higher voltage and valid, select this instead
@@ -124,7 +121,7 @@ bool pdbs_dpm_evaluate_capability(const pd_msg *capabilities, pd_msg *request) {
// 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 = (TIP_RESISTANCE * max_current);
int ideal_voltage_mv = (getTipResitanceX10() * max_current);
if (ideal_voltage_mv > max_voltage) {
ideal_voltage_mv = max_voltage; // constrain
}
@@ -186,7 +183,7 @@ void pdbs_dpm_get_sink_capability(pd_msg *cap, const bool isPD3) {
// if (requested_voltage_mv != 5000) {
// voltage = requested_voltage_mv;
// }
// uint16_t current = (voltage) / TIP_RESISTANCE; // In centi-amps
// uint16_t current = (voltage) / getTipResitanceX10(); // In centi-amps
// /* Add a PDO for the desired power. */
// cap->obj[numobj++] = PD_PDO_TYPE_FIXED | PD_PDO_SNK_FIXED_VOLTAGE_SET(PD_MV2PDV(voltage)) | PD_PDO_SNK_FIXED_CURRENT_SET(current);