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69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/*
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* This file is part of the TM1637 project.
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* Copyright 2019 Edward Emelianov <eddy@sao.ru>.
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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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#include "usart.h"
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/**
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* @brief gpio_setup - setup GPIOs for external IO
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* GPIO pinout:
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* PC13 - open drain - onboard LED (blinks when board works)
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*/
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static inline void gpio_setup(){
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// Enable clocks to the GPIO subsystems
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RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN | RCC_AHBENR_GPIOCEN;
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GPIOC->MODER = GPIO_MODER_MODER13_O;
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GPIOC->OTYPER = GPIO_OTYPER_OT_13;
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/*
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// PA6/7 - AF; PB1 - AF
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GPIOA->MODER = GPIO_MODER_MODER4_O | GPIO_MODER_MODER6_AF | GPIO_MODER_MODER7_AF;
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GPIOA->OTYPER = GPIO_OTYPER_OT_4;
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// alternate functions:
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// PA6 - TIM3_CH1, PA7 - TIM3_CH2
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GPIOA->AFR[0] = (GPIOA->AFR[0] &~ (GPIO_AFRL_AFRL6 | GPIO_AFRL_AFRL7)) \
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| (1 << (6 * 4)) | (1 << (7 * 4));
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*/
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}
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static inline void i2c_setup(){
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I2C1->CR1 = 0;
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/*
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* GPIO Resources: I2C1_SCL - PB6 (AF1), I2C1_SDA - PB7 (AF1)
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*/
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GPIOB->MODER |= GPIO_MODER_MODER6_AF | GPIO_MODER_MODER7_AF; // alternate function
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GPIOB->AFR[0] = (GPIOB->AFR[0] &~ (GPIO_AFRL_AFRL6 | GPIO_AFRL_AFRL7)) \
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| (1 << (6 * 4)) | (1 << (7 * 4));
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// GPIOB->OTYPER |= GPIO_OTYPER_OT_6 | GPIO_OTYPER_OT_7; // opendrain
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// I2C
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RCC->APB1ENR |= RCC_APB1ENR_I2C1EN; // timing
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RCC->CFGR3 |= RCC_CFGR3_I2C1SW; // use sysclock for timing
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// 100kHz
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// Clock = 6MHz, 0.16(6)us, need 5us (*30)
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// PRESC=4 (f/5), SCLDEL=0 (t_SU=5/6us), SDADEL=0 (t_HD=5/6us), SCLL,SCLH=14 (2.(3)us)
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I2C1->TIMINGR = (0xB<<28) | (4<<20) | (2<<16) | (0x12<<8) | (0x11);
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I2C1->CR1 = I2C_CR1_PE; // Enable I2C
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}
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void hw_setup(){
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sysreset();
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gpio_setup();
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i2c_setup();
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USART1_config();
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}
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