|
|
@ -0,0 +1,76 @@ |
|
|
|
/* 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; |
|
|
|
} |