204 lines
4.2 KiB
C
204 lines
4.2 KiB
C
/** @defgroup i2c_file I2C
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@ingroup LPC43xx
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@brief <b>libopencm3 LPC43xx I2C</b>
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@version 1.0.0
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@author @htmlonly © @endhtmlonly 2012 Michael Ossmann <mike@ossmann.com>
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@author @htmlonly © @endhtmlonly 2014 Jared Boone <jared@sharebrained.com>
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LGPL License Terms @ref lgpl_license
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2012 Michael Ossmann <mike@ossmann.com>
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* Copyright (C) 2014 Benjamin Vernoux <bvernoux@gmail.com>
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* Copyright (C) 2014 Jared Boone <jared@sharebrained.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* This is a very minimal I2C driver just to make sure we can get the
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* peripheral working.
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*/
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/**@{*/
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#include <libopencm3/lpc43xx/i2c.h>
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#include <libopencm3/lpc43xx/scu.h>
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#include <libopencm3/lpc43xx/cgu.h>
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#define I2C_TIMEOUT (10000)
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#define SFSP_I2C1_SDA_SCL (0x00000001 | SCU_CONF_ZIF_DIS_IN_GLITCH_FILT | SCU_CONF_EZI_EN_IN_BUFFER)
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void i2c_init(i2c_port_t port, const uint16_t duty_cycle_count)
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{
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I2C_SCLH(port) = duty_cycle_count;
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I2C_SCLL(port) = duty_cycle_count;
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/* clear the control bits */
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I2C_CONCLR(port) = (I2C_CONCLR_AAC | I2C_CONCLR_SIC
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| I2C_CONCLR_STAC | I2C_CONCLR_I2ENC);
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/* enable I2C0 */
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I2C_CONSET(port) = I2C_CONSET_I2EN;
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}
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void i2c_disable(i2c_port_t port) {
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I2C_CONCLR(port) = I2C_CONCLR_I2ENC;
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}
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/* transmit start bit */
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void i2c_tx_start(i2c_port_t port)
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{
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uint32_t timeout;
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I2C_CONCLR(port) = I2C_CONCLR_SIC;
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I2C_CONSET(port) = I2C_CONSET_STA;
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timeout = 0;
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while( (!(I2C_CONSET(port) & I2C_CONSET_SI)) && (timeout < I2C_TIMEOUT) )
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{
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timeout++;
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}
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I2C_CONCLR(port) = I2C_CONCLR_STAC;
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}
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/* transmit data byte */
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void i2c_tx_byte(i2c_port_t port, uint8_t byte)
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{
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uint32_t timeout;
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if (I2C_CONSET(port) & I2C_CONSET_STA) {
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I2C_CONCLR(port) = I2C_CONCLR_STAC;
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}
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I2C_DAT(port) = byte;
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I2C_CONCLR(port) = I2C_CONCLR_SIC;
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timeout = 0;
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while( (!(I2C_CONSET(port) & I2C_CONSET_SI)) && (timeout < I2C_TIMEOUT) )
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{
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timeout++;
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}
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}
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/* receive data byte */
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uint8_t i2c_rx_byte(i2c_port_t port, bool ack)
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{
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uint32_t timeout;
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if (I2C_CONSET(port) & I2C_CONSET_STA) {
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I2C_CONCLR(port) = I2C_CONCLR_STAC;
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}
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I2C_CONCLR(port) = I2C_CONCLR_SIC;
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if (ack) {
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I2C_CONSET(port) = I2C_CONSET_AA;
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} else {
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I2C_CONCLR(port) = I2C_CONCLR_AAC;
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}
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timeout = 0;
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while( (!(I2C_CONSET(port) & I2C_CONSET_SI)) && (timeout < I2C_TIMEOUT) )
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{
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timeout++;
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}
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return I2C_DAT(port);
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}
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/* transmit stop bit */
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void i2c_stop(i2c_port_t port)
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{
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if (I2C_CONSET(port) & I2C_CONSET_STA) {
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I2C_CONCLR(port) = I2C_CONCLR_STAC;
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}
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I2C_CONSET(port) = I2C_CONSET_STO;
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I2C_CONCLR(port) = I2C_CONCLR_SIC;
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}
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/* I2C0 wrappers for compatibility with old code */
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void i2c0_init(const uint16_t duty_cycle_count)
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{
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/* enable input on SCL and SDA pins */
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SCU_SFSI2C0 = SCU_I2C0_NOMINAL;
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i2c_init(I2C0, duty_cycle_count);
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}
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void i2c1_init(const uint16_t duty_cycle_count)
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{
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/* Configure pin function for I2C1*/
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SCU_SFSP2_3 = SFSP_I2C1_SDA_SCL;
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SCU_SFSP2_4 = SFSP_I2C1_SDA_SCL;
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i2c_init(I2C1, duty_cycle_count);
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}
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/* transmit start bit */
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void i2c0_tx_start(void)
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{
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i2c_tx_start(I2C0);
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}
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/* transmit start bit */
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void i2c1_tx_start(void)
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{
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i2c_tx_start(I2C1);
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}
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/* transmit data byte */
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void i2c0_tx_byte(uint8_t byte)
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{
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i2c_tx_byte(I2C0, byte);
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}
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/* transmit data byte */
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void i2c1_tx_byte(uint8_t byte)
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{
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i2c_tx_byte(I2C1, byte);
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}
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/* receive data byte */
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uint8_t i2c0_rx_byte(bool ack) {
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return i2c_rx_byte(I2C0, ack);
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}
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/* receive data byte */
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uint8_t i2c1_rx_byte(bool ack) {
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return i2c_rx_byte(I2C1, ack);
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}
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/* transmit stop bit */
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void i2c0_stop(void)
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{
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i2c_stop(I2C0);
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}
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/* transmit stop bit */
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void i2c1_stop(void)
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{
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i2c_stop(I2C1);
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}
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/**@}*/
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