Add initial set of I2C functions.
Thomas Otto has tested the code by successfully talking to a temperature sensor from ST in master tranciever mode. Thanks Thomas Otto <tommi@viadmin.org> for the patch!
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@ -308,4 +308,25 @@
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* TRISE[5:0]: Maximum rise time in Fast/Standard mode (master mode)
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*/
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/* --- I2C const definitions ----------------------------------------------- */
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#define I2C_WRITE 0
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#define I2C_READ 1
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/* --- I2C funtion prototypes----------------------------------------------- */
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void i2c_peripheral_enable(u32 i2c);
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void i2c_peripheral_disable(u32 i2c);
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void i2c_send_start(u32 i2c);
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void i2c_send_stop(u32 i2c);
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void i2c_set_own_7bit_slave_address(u32 i2c, u8 slave);
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void i2c_set_own_10bit_slave_address(u32 i2c, u16 slave);
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void i2c_set_fast_mode(u32 i2c);
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void i2c_set_standard_mode(u32 i2c);
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void i2c_set_clock_frequency(u32 i2c, u8 freq);
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void i2c_set_ccr(u32 i2c, u16 freq);
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void i2c_set_trise(u32 i2c, u16 trise);
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void i2c_send_7bit_address(u32 i2c, u8 slave, u8 readwrite);
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void i2c_send_data(u32 i2c, u8 data);
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#endif
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@ -27,7 +27,8 @@ CFLAGS = -Os -g -Wall -Wextra -I../include -fno-common \
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-mcpu=cortex-m3 -mthumb -Wstrict-prototypes
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# ARFLAGS = rcsv
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ARFLAGS = rcs
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OBJS = vector.o rcc.o gpio.o usart.o adc.o spi.o flash.o nvic.o rtc.o
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OBJS = vector.o rcc.o gpio.o usart.o adc.o spi.o flash.o nvic.o \
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rtc.o i2c.o
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# Be silent per default, but 'make V=1' will show all compiler calls.
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ifneq ($(V),1)
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@ -0,0 +1,93 @@
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/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
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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 <libopenstm32.h>
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void i2c_peripheral_enable(u32 i2c)
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{
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I2C_CR1(i2c) |= I2C_CR1_PE;
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}
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void i2c_peripheral_disable(u32 i2c)
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{
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I2C_CR1(i2c) &= ~I2C_CR1_PE;
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}
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void i2c_send_start(u32 i2c)
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{
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I2C_CR1(i2c) |= I2C_CR1_START;
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}
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void i2c_send_stop(u32 i2c)
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{
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I2C_CR1(i2c) |= I2C_CR1_STOP;
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}
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void i2c_set_own_7bit_slave_address(u32 i2c, u8 slave)
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{
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I2C_OAR1(i2c) = (u16)(slave << 1);
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I2C_OAR1(i2c) &= ~I2C_OAR1_ADDMODE;
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I2C_OAR1(i2c) |= (1 << 14); /* Datasheet: always keep 1 by software. */
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}
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void i2c_set_own_10bit_slave_address(u32 i2c, u16 slave)
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{
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I2C_OAR1(i2c) = (u16)(I2C_OAR1_ADDMODE | slave);
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}
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void i2c_set_fast_mode(u32 i2c)
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{
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I2C_CCR(i2c) |= I2C_CCR_FS;
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}
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void i2c_set_standard_mode(u32 i2c)
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{
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I2C_CCR(i2c) &= ~I2C_CCR_FS;
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}
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void i2c_set_clock_frequency(u32 i2c, u8 freq)
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{
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u16 reg16;
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reg16 = I2C_CR2(i2c) & 0xffc0; /* Clear bits [5:0]. */
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reg16 |= freq;
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I2C_CR2(i2c) = reg16;
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}
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void i2c_set_ccr(u32 i2c, u16 freq)
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{
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u16 reg16;
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reg16 = I2C_CCR(i2c) & 0xf000; /* Clear bits [11:0]. */
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reg16 |= freq;
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I2C_CCR(i2c) = reg16;
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}
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void i2c_set_trise(u32 i2c, u16 trise)
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{
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I2C_TRISE(i2c) = trise;
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}
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void i2c_send_7bit_address(u32 i2c, u8 slave, u8 readwrite)
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{
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I2C_DR(i2c) = (u8)((slave << 1) | readwrite);
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}
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void i2c_send_data(u32 i2c, u8 data)
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{
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I2C_DR(i2c) = data;
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}
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