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/* Copyright 2021 Nick Brassel (@tzarc)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <quantum.h>
#ifndef USBPD_UCPD1_CFG1
# define USBPD_UCPD1_CFG1 (UCPD_CFG1_PSC_UCPDCLK_0 | UCPD_CFG1_TRANSWIN_3 | UCPD_CFG1_IFRGAP_4 | UCPD_CFG1_HBITCLKDIV_4)
#endif // USBPD_UCPD1_CFG1
// Initialises the USBPD subsystem
__attribute__((weak)) void usbpd_init(void) {
// Disable dead-battery signals
PWR->CR3 |= PWR_CR3_UCPD_DBDIS;
// Enable the clock for the UCPD1 peripheral
RCC->APB1ENR2 |= RCC_APB1ENR2_UCPD1EN;
// Copy the existing value
uint32_t CFG1 = UCPD1->CFG1;
// Force-disable UCPD1 before configuring
CFG1 &= ~UCPD_CFG1_UCPDEN;
// Configure UCPD1
CFG1 = USBPD_UCPD1_CFG1;
// Apply the changes
UCPD1->CFG1 = CFG1;
// Enable UCPD1
UCPD1->CFG1 |= UCPD_CFG1_UCPDEN;
// Copy the existing value
uint32_t CR = UCPD1->CR;
// Clear out ANASUBMODE (irrelevant as a sink device)
CR &= ~UCPD_CR_ANASUBMODE_Msk;
// Advertise our capabilities as a sink, with both CC lines enabled
CR |= UCPD_CR_ANAMODE | UCPD_CR_CCENABLE_Msk;
// Apply the changes
UCPD1->CR = CR;
}
// Gets the current state of the USBPD allowance
__attribute__((weak)) usbpd_allowance_t usbpd_get_allowance(void) {
uint32_t CR = UCPD1->CR;
int ucpd_enabled = (UCPD1->CFG1 & UCPD_CFG1_UCPDEN_Msk) >> UCPD_CFG1_UCPDEN_Pos;
int anamode = (CR & UCPD_CR_ANAMODE_Msk) >> UCPD_CR_ANAMODE_Pos;
int cc_enabled = (CR & UCPD_CR_CCENABLE_Msk) >> UCPD_CR_CCENABLE_Pos;
if (ucpd_enabled && anamode && cc_enabled) {
uint32_t SR = UCPD1->SR;
int vstate_cc1 = (SR & UCPD_SR_TYPEC_VSTATE_CC1_Msk) >> UCPD_SR_TYPEC_VSTATE_CC1_Pos;
int vstate_cc2 = (SR & UCPD_SR_TYPEC_VSTATE_CC2_Msk) >> UCPD_SR_TYPEC_VSTATE_CC2_Pos;
int vstate_max = vstate_cc1 > vstate_cc2 ? vstate_cc1 : vstate_cc2;
switch (vstate_max) {
case 0:
case 1:
return USBPD_500MA; // Note that this is 500mA (i.e. max USB 2.0), not 900mA, as we're not using USB 3.1 as a sink device.
case 2:
return USBPD_1500MA;
case 3:
return USBPD_3000MA;
}
}
return USBPD_500MA;
}
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