/* * This file is part of the libopencm3 project. * * Copyright (C) 2010 Thomas Otto * * This library is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library. If not, see . */ #include #include void i2c_reset(u32 i2c) { switch (i2c) { case I2C1: rcc_peripheral_reset(&RCC_APB1RSTR, RCC_APB1RSTR_I2C1RST); rcc_peripheral_clear_reset(&RCC_APB1RSTR, RCC_APB1RSTR_I2C1RST); break; case I2C2: rcc_peripheral_reset(&RCC_APB1RSTR, RCC_APB1RSTR_I2C2RST); rcc_peripheral_clear_reset(&RCC_APB1RSTR, RCC_APB1RSTR_I2C2RST); break; } } void i2c_peripheral_enable(u32 i2c) { I2C_CR1(i2c) |= I2C_CR1_PE; } void i2c_peripheral_disable(u32 i2c) { I2C_CR1(i2c) &= ~I2C_CR1_PE; } void i2c_send_start(u32 i2c) { I2C_CR1(i2c) |= I2C_CR1_START; } void i2c_send_stop(u32 i2c) { I2C_CR1(i2c) |= I2C_CR1_STOP; } void i2c_set_own_7bit_slave_address(u32 i2c, u8 slave) { I2C_OAR1(i2c) = (u16)(slave << 1); I2C_OAR1(i2c) &= ~I2C_OAR1_ADDMODE; I2C_OAR1(i2c) |= (1 << 14); /* Datasheet: always keep 1 by software. */ } void i2c_set_own_10bit_slave_address(u32 i2c, u16 slave) { I2C_OAR1(i2c) = (u16)(I2C_OAR1_ADDMODE | slave); } void i2c_set_fast_mode(u32 i2c) { I2C_CCR(i2c) |= I2C_CCR_FS; } void i2c_set_standard_mode(u32 i2c) { I2C_CCR(i2c) &= ~I2C_CCR_FS; } void i2c_set_clock_frequency(u32 i2c, u8 freq) { u16 reg16; reg16 = I2C_CR2(i2c) & 0xffc0; /* Clear bits [5:0]. */ reg16 |= freq; I2C_CR2(i2c) = reg16; } void i2c_set_ccr(u32 i2c, u16 freq) { u16 reg16; reg16 = I2C_CCR(i2c) & 0xf000; /* Clear bits [11:0]. */ reg16 |= freq; I2C_CCR(i2c) = reg16; } void i2c_set_trise(u32 i2c, u16 trise) { I2C_TRISE(i2c) = trise; } void i2c_send_7bit_address(u32 i2c, u8 slave, u8 readwrite) { I2C_DR(i2c) = (u8)((slave << 1) | readwrite); } void i2c_send_data(u32 i2c, u8 data) { I2C_DR(i2c) = data; }