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100 lines
4.1 KiB
C
100 lines
4.1 KiB
C
/*
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* geany_encoding=koi8-r
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* hardware.c - hardware-dependent macros & functions
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*
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* Copyright 2018 Edward V. Emelianov <eddy@sao.ru, 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 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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#include "hardware.h"
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I2C_SPEED curI2Cspeed = LOW_SPEED;
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void gpio_setup(void){
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// here we turn on clocking for all periph.
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RCC->AHBENR |= RCC_AHBENR_GPIOBEN | RCC_AHBENR_GPIOAEN | RCC_AHBENR_DMAEN;
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// Set LEDS (PB10/11) & multiplexer as output (PB0..2,12)
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GPIOB->MODER = (GPIOB->MODER & ~(GPIO_MODER_MODER10 | GPIO_MODER_MODER11 |
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GPIO_MODER_MODER0 | GPIO_MODER_MODER1 |
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GPIO_MODER_MODER2 | GPIO_MODER_MODER12 )
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) |
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GPIO_MODER_MODER10_O | GPIO_MODER_MODER11_O |
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GPIO_MODER_MODER0_O | GPIO_MODER_MODER1_O |
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GPIO_MODER_MODER2_O | GPIO_MODER_MODER12_O;
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// multiplexer outputs are push-pull, GPIOB->OTYPER = 0
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MUL_OFF();
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// PA8 - power enable
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GPIOA->MODER = (GPIOA->MODER & ~(GPIO_MODER_MODER8)) |
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GPIO_MODER_MODER8_O;
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// PA13..15 (low bits) + PB15 (high bit) - CAN address, pullup inputs
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GPIOA->PUPDR = (GPIOA->PUPDR & ~(GPIO_PUPDR_PUPDR13 | GPIO_PUPDR_PUPDR14 |
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GPIO_PUPDR_PUPDR15)
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) |
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GPIO_PUPDR_PUPDR13_0 | GPIO_PUPDR_PUPDR14_0 |
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GPIO_PUPDR_PUPDR15_0;
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GPIOB->PUPDR = (GPIOB->PUPDR & ~(GPIO_PUPDR_PUPDR15)) |
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GPIO_PUPDR_PUPDR15_0;
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pin_set(LED0_port, LED0_pin); // clear LEDs
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pin_set(LED1_port, LED1_pin);
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}
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void i2c_setup(I2C_SPEED speed){
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if(speed == CURRENT_SPEED){
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speed = curI2Cspeed;
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}else{
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curI2Cspeed = speed;
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}
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I2C1->CR1 = 0;
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#if I2CPINS == 910
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/*
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* GPIO Resources: I2C1_SCL - PA9, I2C1_SDA - PA10
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* GPIOA->AFR[1]
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*/
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GPIOA->AFR[1] &= ~0xff0; // alternate function F4 for PA9/PA10
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GPIOA->AFR[1] |= 0x440;
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GPIOA->MODER &= ~(GPIO_MODER_MODER9 | GPIO_MODER_MODER10);
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GPIOA->MODER |= GPIO_MODER_MODER9_AF | GPIO_MODER_MODER10_AF; // alternate function
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GPIOA->OTYPER |= GPIO_OTYPER_OT_9 | GPIO_OTYPER_OT_10; // opendrain
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//GPIOA->OTYPER |= GPIO_OTYPER_OT_10; // opendrain
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#elif I2CPINS == 67
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/*
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* GPIO Resources: I2C1_SCL - PB6, I2C1_SDA - PB7 (AF1)
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* GPIOB->AFR[0] -> 1<<6*4 | 1<<7*4 = 0x11000000
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*/
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GPIOB->AFR[0] = (GPIOB->AFR[0] & ~0xff000000) | 0x11000000;
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GPIOB->MODER = (GPIOB->MODER & ~(GPIO_MODER_MODER6 | GPIO_MODER_MODER7)) |
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GPIO_MODER_MODER6_AF | GPIO_MODER_MODER7_AF;
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GPIOB->OTYPER |= GPIO_OTYPER_OT_6 | GPIO_OTYPER_OT_7;
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#else // undefined
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#error "Not implemented"
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#endif
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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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if(speed == LOW_SPEED){ // 10kHz
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// PRESC=B, SCLDEL=4, SDADEL=2, SCLH=0xC3, SCLL=0xB0
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I2C1->TIMINGR = (0xB<<28) | (4<<20) | (2<<16) | (0xC3<<8) | (0xB0);
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}else if(speed == HIGH_SPEED){ // 100kHz
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I2C1->TIMINGR = (0xB<<28) | (4<<20) | (2<<16) | (0x12<<8) | (0x11);
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}else{ // VERYLOW_SPEED - the lowest speed by STM register: 5.8kHz (presc = 16-1 = 15; )
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I2C1->TIMINGR = (0xf<<28) | (4<<20) | (2<<16) | (0xff<<8) | (0xff);
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}
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I2C1->CR1 = I2C_CR1_PE;// | I2C_CR1_RXIE; // Enable I2C & (interrupt on receive - not supported yet)
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}
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