134 lines
4.4 KiB
C
134 lines
4.4 KiB
C
/*
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* Copyright (c) 2011, Hedde Bosman <heddebosman@incas3.eu>
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*
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* I2C communication device drivers for mc1322x
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#ifndef I2C_H
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#define I2C_H
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#include <stdint.h>
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#include "isr.h"
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#include "gpio.h"
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#define I2C_NON_BLOCKING 1
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/* The I2C Interrupt Service Routine */
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void i2c_isr (void);
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/* Enable the I2C module */
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void i2c_enable(void);
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/* Disable the I2C module */
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void i2c_disable(void);
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/* Returns 1 if the I2C bus is active (we or some other device are transferring data) */
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uint8_t i2c_busy(void);
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/* Returns 1 if our data is sent or received */
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uint8_t i2c_transferred(void); // indicates success of data last transfer (send or receive)
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/* start receiving data from 'slave_address' of length 'byte_ctr' and store it in 'rx_buf'
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* @parameter slave_addr 7bits (and will be padded with the 'receive bit')
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* @parameter byte_ctr the number of bytes expected to be received
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* @parameter rx_buf the buffer in which the received bytes will be stored.
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*
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* IFDEF I2C_NON_BLOCKING THEN THIS FUNCTION RETURNS IMMEDIATLY BUT THE TRANSFER WILL ONLY
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* BE COMPLETE WHEN i2c_transferred IS 1
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*/
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void i2c_receiveinit( uint8_t slave_address, uint8_t byte_ctr, uint8_t *rx_buf);
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/* start sending data to 'slave_address' of length 'byte_ctr' found in the buffer 'rx_buf'
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* @parameter slave_addr 7bits (and will be padded with the 'send bit')
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* @parameter byte_ctr the number of bytes to be sent
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* @parameter tx_buf the buffer in which the bytes to be sent are stored
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*
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* IFDEF I2C_NON_BLOCKING THEN THIS FUNCTION RETURNS IMMEDIATLY BUT THE TRANSFER WILL ONLY
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* BE COMPLETE WHEN i2c_transferred IS 1
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*/
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void i2c_transmitinit(uint8_t slave_address, uint8_t byte_ctr, uint8_t *tx_buf);
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#ifndef I2C_NON_BLOCKING
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#define I2C_NON_BLOCKING 1
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#endif
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#if I2C_NON_BLOCKING
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uint8_t i2c_receive(void);
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void i2c_transmit(void);
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#endif
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// TODO: see if this is better fit in platform definition
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#define I2C_SDA 13 //SDA == P5.1 // GPIO 13
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#define I2C_SCL 12 //SCL == P5.2 // GPIO 12
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// TODO: this could use a nice struct with bit members...
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#define I2C_BASE (0x80006000)
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#define I2CADR ((volatile uint8_t *) ( I2C_BASE + 0x00 ))
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#define I2CFDR ((volatile uint8_t *) ( I2C_BASE + 0x04 ))
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#define I2CCR ((volatile uint8_t *) ( I2C_BASE + 0x08 ))
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#define I2CSR ((volatile uint8_t *) ( I2C_BASE + 0x0C ))
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#define I2CDR ((volatile uint8_t *) ( I2C_BASE + 0x10 ))
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#define I2CDFSRR ((volatile uint8_t *) ( I2C_BASE + 0x14 ))
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#define I2CCKER ((volatile uint8_t *) ( I2C_BASE + 0x18 ))
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// TODO: fix nice structs
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// i2c CR
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#define I2C_MEN 0x80
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#define I2C_MIEN 0x40
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#define I2C_MSTA 0x20
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#define I2C_MTX 0x10
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#define I2C_TXAK 0x08
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#define I2C_RSTA 0x04
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#define I2C_BCST 0x01
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// i2c SR
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#define I2C_MCF 0x80
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#define I2C_MAAS 0x40
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#define I2C_MBB 0x20
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#define I2C_MAL 0x10
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#define I2C_BCSTM 0x08
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#define I2C_SRW 0x04
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#define I2C_MIF 0x02
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#define I2C_RXAK 0x01
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// i2c digital filter sample rate register
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#define I2C_DFSR 0x3f // default = 0x10
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// i2c CKER
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#define I2C_CKEN 0x01
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#endif
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