From 742c5951144a3446dc48067f8216b2882bbad363 Mon Sep 17 00:00:00 2001 From: Uwe Hermann Date: Mon, 1 Mar 2010 21:47:14 +0100 Subject: 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 for the patch! --- lib/i2c.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100644 lib/i2c.c (limited to 'lib/i2c.c') diff --git a/lib/i2c.c b/lib/i2c.c new file mode 100644 index 0000000..7dbc889 --- /dev/null +++ b/lib/i2c.c @@ -0,0 +1,93 @@ +/* + * This file is part of the libopenstm32 project. + * + * Copyright (C) 2010 Thomas Otto + * + * 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 . + */ + +#include + +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; +} -- cgit v1.2.3