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/*------------------------------------------------------------------------------
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-- This file is a part of the libuc, microcontroler library
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-- Copyright (C) 2012, Alexis Jeandet
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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, write to the Free Software
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-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-------------------------------------------------------------------------------
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-- Author : Alexis Jeandet
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-- Mail : alexis.jeandet@gmail.com
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-------------------------------------------------------------------------------*/
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#include <i2c.h>
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#include <stm32f4xx_usart.h>
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#include <stm32f4xx_rcc.h>
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#include <stm32f4xx_gpio.h>
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#include <gpio.h>
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#include <core.h>
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#define GPIOGETPORT(gpio) ((GPIO_TypeDef*)(((((uint32_t)gpio) & (uint32_t)0x0000FF00)*(uint32_t)4) + (uint32_t)GPIOA))
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#define GPIOPORTNUM(gpio) (((uint32_t)(gpio) & (uint32_t)0x0000FF00)>>(uint32_t)8)
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I2C_TypeDef* _i2c_dev_table[3]={I2C1,I2C2,I2C3};
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i2c_t i2copen(int count)
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{
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#define _INIT_DEV(_RCC_) \
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RCC_APB1PeriphClockCmd(_RCC_, ENABLE); \
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RCC_APB1PeriphResetCmd(_RCC_, ENABLE); \
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RCC_APB1PeriphResetCmd(_RCC_, DISABLE); \
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RCC_APB1PeriphClockCmd(_RCC_, ENABLE);
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switch(count)
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{
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case 0:
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_INIT_DEV(RCC_APB1Periph_I2C1);
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return (i2c_t) 0;
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break;
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case 1:
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_INIT_DEV(RCC_APB1Periph_I2C2);
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return (i2c_t) 1;
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break;
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case 2:
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_INIT_DEV(RCC_APB1Periph_I2C3);
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return (i2c_t) 2;
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break;
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default:
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break;
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}
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return -1;
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}
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i2c_t i2copenandconfig(int count,uint32_t cfg,uint32_t speed,uint32_t SDA,uint32_t SCL)
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{
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i2c_t dev = i2copen(count);
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printf("dev = %d\n\r",dev);
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if(dev!=-1)
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{
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i2cenable(count);
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I2C_TypeDef* _dev_ = _i2c_dev_table[(int)dev];
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_dev_->CR1 = (1<<15);
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_dev_->CR1 &=~(1<<15);
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i2cdisable(count);
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i2csetpins(dev,SDA,SCL);
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i2csetspeed(dev,speed);
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i2cenable(count);
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}
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return dev;
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}
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int i2cclose(i2c_t dev)
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{
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switch((int)dev)
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{
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case (int)0:
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
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break;
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case (int)1:
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
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break;
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case (int)2:
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, ENABLE);
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break;
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default:
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break;
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}
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return 1;
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}
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int i2csetpins(i2c_t dev, uint32_t SDA, uint32_t SCL)
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{
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if((dev<3)&&(dev>=0))
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{
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gpio_t SDApin,SCLpin;
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SDApin = gpioopen(SDA);
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SCLpin = gpioopen(SCL);
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SDApin |= gpiolowspeed | gpioaf | gpioopendraintype | gpionopulltype;
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SCLpin |= gpiolowspeed | gpioaf | gpioopendraintype | gpionopulltype;
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gpiosetconfig(&SDApin);
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gpiosetconfig(&SCLpin);
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uint8_t gpioAFi2cx = GPIO_AF_I2C1;
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switch((int)dev)
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{
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case 0:
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gpioAFi2cx = GPIO_AF_I2C1;
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break;
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case 1:
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gpioAFi2cx = GPIO_AF_I2C2;
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break;
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case 2:
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gpioAFi2cx = GPIO_AF_I2C3;
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break;
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default:
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break;
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}
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GPIO_PinAFConfig(GPIOGETPORT(SDApin), (uint8_t)(SDApin & 0xF), gpioAFi2cx);
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GPIO_PinAFConfig(GPIOGETPORT(SCLpin), (uint8_t)(SCLpin & 0xF), gpioAFi2cx);
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return 0;
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}
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return -1;
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}
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int i2cenable(i2c_t dev)
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{
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if((dev<3)&&(dev>=0))
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{
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I2C_TypeDef* _dev_ = _i2c_dev_table[(int)dev];
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_dev_->CR1 |=1 ;
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return 0;
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}
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return -1;
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}
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int i2cdisable(i2c_t dev)
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{
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if((dev<3)&&(dev>=0))
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{
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I2C_TypeDef* _dev_ = _i2c_dev_table[(int)dev];
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_dev_->CR1 &= ~1;
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return 0;
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}
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return -1;
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}
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int i2csetspeed(i2c_t dev,uint32_t speed)
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{
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if((dev<3)&&(dev>=0))
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{
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I2C_TypeDef* _dev_ = _i2c_dev_table[(int)dev];
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int32_t APB1Freq=getAPB1Freq()/1000000;
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if((APB1Freq>1)&&(APB1Freq<43))
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{
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int enabled=((_dev_->CR1&1)==1);
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i2cdisable(dev);
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_dev_->CR2 &= ~(0x1f);
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_dev_->CR2 |= APB1Freq;
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if(speed>100000) //100kHz= standard mode, 400kHz= fast mode
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{
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if(speed<=400000)
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{
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_dev_->CCR |= 1<<15;
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_dev_->CCR &= ~(1<<14);
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_dev_->CCR &= ~(0xfff);
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_dev_->CCR |= 0xfff & (APB1Freq/(3*speed));
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}
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}
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else
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{
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_dev_->CCR &= ~(1<<15);
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_dev_->CCR &= ~(0xfff);
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_dev_->CCR |= 0xfff & (APB1Freq/(2*speed));
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}
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if(enabled)i2cenable(dev);
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return 0;
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}
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}
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return -1;
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}
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int i2cwrite(i2c_t dev,char address,char* data,int count)
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{
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if((dev<3)&&(dev>=0))
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{
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I2C_TypeDef* _dev_ = _i2c_dev_table[(int)dev];
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_dev_->CR1 |= 1<<8;
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while((_dev_->SR1&1)==0);
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_dev_->DR= address<<1;
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while((_dev_->SR1 & (1<<3))==0);
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address=_dev_->SR2;
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for(int i=0;i<count;i++)
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{
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while((_dev_->SR1 & (1<<7))==0);
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_dev_->DR= data[i];
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}
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while((_dev_->SR1 & (1<<7))==0);
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while((_dev_->SR1 & (1<<2))==0);
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_dev_->CR1 |= 1<<9;
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return count;
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}
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return -1;
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}
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int i2cread(i2c_t dev,char address,char* data,int count)
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{
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if((dev<3)&&(dev>=0))
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{
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I2C_TypeDef* _dev_ = _i2c_dev_table[(int)dev];
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_dev_->CR1 |= (1<<8) | (1<<10);
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if(count==1)
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{
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_dev_->CR1 &= ~(1<<10);
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}
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while((_dev_->SR1&1)==0);
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_dev_->DR= (address<<1) + 1;
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while((_dev_->SR1 & (1<<3))==0);
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address=_dev_->SR2;
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for(int i=0;i<count-1;i++)
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{
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while((_dev_->SR1 & (1<<6))==0);
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data[i]=_dev_->DR;
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}
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_dev_->CR1 &= ~(1<<10);
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_dev_->CR1 |= 1<<9;
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while((_dev_->SR1 & (1<<6))==0);
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data[count-1]=_dev_->DR;
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return count;
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}
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return -1;
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}
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