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40 lines
1.6 KiB
C
40 lines
1.6 KiB
C
/*
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* This file is part of the canonmanage project.
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* Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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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 3 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 "hardware.h"
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static inline void gpio_setup(){
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// Set APB2 clock to 72/4=18MHz
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RCC->CFGR = (RCC->CFGR & ~RCC_CFGR_PPRE2) | RCC_CFGR_PPRE2_DIV4;
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// Enable clocks to the GPIO subsystems, turn on AFIO clocking to disable SWD/JTAG
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RCC->APB2ENR = RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_AFIOEN;
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AFIO->MAPR = AFIO_MAPR_SWJ_CFG_JTAGDISABLE; // for PA15 - USB pullup
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// Set led as opendrain output
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GPIOC->CRH = CRH(13, CNF_ODOUTPUT | MODE_SLOW);
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// setup SPI GPIO - alternate function PP (PA5 - SCK, PA6 - MISO, PA7 - MOSI)
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GPIOA->CRL = CRL(5, CNF_AFPP|MODE_FAST) | CRL(6, CNF_FLINPUT) | CRL(7, CNF_AFPP|MODE_FAST);
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// USB pullup (PA15) - pushpull output
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USBPU_OFF();
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GPIOA->CRH = CRH(15, CNF_PPOUTPUT | MODE_SLOW);
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}
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void hw_setup(){
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gpio_setup();
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}
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