79 lines
No EOL
3 KiB
C
79 lines
No EOL
3 KiB
C
/* Copyright 2021 Nick Brassel (@tzarc)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <quantum.h>
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#ifndef USBPD_UCPD1_CFG1
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# define USBPD_UCPD1_CFG1 (UCPD_CFG1_PSC_UCPDCLK_0 | UCPD_CFG1_TRANSWIN_3 | UCPD_CFG1_IFRGAP_4 | UCPD_CFG1_HBITCLKDIV_4)
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#endif // USBPD_UCPD1_CFG1
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// Initialises the USBPD subsystem
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__attribute__((weak)) void usbpd_init(void) {
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// Enable the clock for the UCPD1 peripheral
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RCC->APB1ENR2 |= RCC_APB1ENR2_UCPD1EN;
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// Copy the existing value
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uint32_t CFG1 = UCPD1->CFG1;
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// Force-disable UCPD1 before configuring
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CFG1 &= ~UCPD_CFG1_UCPDEN;
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// Configure UCPD1
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CFG1 = USBPD_UCPD1_CFG1;
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// Apply the changes
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UCPD1->CFG1 = CFG1;
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// Enable UCPD1
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UCPD1->CFG1 |= UCPD_CFG1_UCPDEN;
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// Copy the existing value
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uint32_t CR = UCPD1->CR;
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// Clear out ANASUBMODE (irrelevant as a sink device)
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CR &= ~UCPD_CR_ANASUBMODE_Msk;
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// Advertise our capabilities as a sink, with both CC lines enabled
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CR |= UCPD_CR_ANAMODE | UCPD_CR_CCENABLE_Msk;
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// Apply the changes
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UCPD1->CR = CR;
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// Disable dead-battery signals only after UCPD1 is configured to ensure
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// that the transition does not go through any intermediate state without
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// any pull-down resistance.
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PWR->CR3 |= PWR_CR3_UCPD_DBDIS;
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}
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// Gets the current state of the USBPD allowance
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__attribute__((weak)) usbpd_allowance_t usbpd_get_allowance(void) {
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uint32_t CR = UCPD1->CR;
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int ucpd_enabled = (UCPD1->CFG1 & UCPD_CFG1_UCPDEN_Msk) >> UCPD_CFG1_UCPDEN_Pos;
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int anamode = (CR & UCPD_CR_ANAMODE_Msk) >> UCPD_CR_ANAMODE_Pos;
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int cc_enabled = (CR & UCPD_CR_CCENABLE_Msk) >> UCPD_CR_CCENABLE_Pos;
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if (ucpd_enabled && anamode && cc_enabled) {
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uint32_t SR = UCPD1->SR;
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int vstate_cc1 = (SR & UCPD_SR_TYPEC_VSTATE_CC1_Msk) >> UCPD_SR_TYPEC_VSTATE_CC1_Pos;
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int vstate_cc2 = (SR & UCPD_SR_TYPEC_VSTATE_CC2_Msk) >> UCPD_SR_TYPEC_VSTATE_CC2_Pos;
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int vstate_max = vstate_cc1 > vstate_cc2 ? vstate_cc1 : vstate_cc2;
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switch (vstate_max) {
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case 0:
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case 1:
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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.
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case 2:
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return USBPD_1500MA;
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case 3:
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return USBPD_3000MA;
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}
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}
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return USBPD_500MA;
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} |