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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!
This commit is contained in:
Uwe Hermann 2010-03-01 21:47:14 +01:00
parent 5455b0970e
commit 742c595114
3 changed files with 116 additions and 1 deletions
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21
include/libopenstm32/i2c.h
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@ -308,4 +308,25 @@
* TRISE[5:0]: Maximum rise time in Fast/Standard mode (master mode)
*/
/* --- I2C const definitions ----------------------------------------------- */
#define I2C_WRITE 0
#define I2C_READ 1
/* --- I2C funtion prototypes----------------------------------------------- */
void i2c_peripheral_enable(u32 i2c);
void i2c_peripheral_disable(u32 i2c);
void i2c_send_start(u32 i2c);
void i2c_send_stop(u32 i2c);
void i2c_set_own_7bit_slave_address(u32 i2c, u8 slave);
void i2c_set_own_10bit_slave_address(u32 i2c, u16 slave);
void i2c_set_fast_mode(u32 i2c);
void i2c_set_standard_mode(u32 i2c);
void i2c_set_clock_frequency(u32 i2c, u8 freq);
void i2c_set_ccr(u32 i2c, u16 freq);
void i2c_set_trise(u32 i2c, u16 trise);
void i2c_send_7bit_address(u32 i2c, u8 slave, u8 readwrite);
void i2c_send_data(u32 i2c, u8 data);
#endif

3
lib/Makefile
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@ -27,7 +27,8 @@ CFLAGS = -Os -g -Wall -Wextra -I../include -fno-common \
-mcpu=cortex-m3 -mthumb -Wstrict-prototypes
# ARFLAGS = rcsv
ARFLAGS = rcs
OBJS = vector.o rcc.o gpio.o usart.o adc.o spi.o flash.o nvic.o rtc.o
OBJS = vector.o rcc.o gpio.o usart.o adc.o spi.o flash.o nvic.o \
rtc.o i2c.o
# Be silent per default, but 'make V=1' will show all compiler calls.
ifneq ($(V),1)

93
lib/i2c.c Normal file
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@ -0,0 +1,93 @@
/*
* This file is part of the libopenstm32 project.
*
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopenstm32.h>
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;
}