mirror of https://github.com/ARMmbed/mbed-os.git
183 lines
4.7 KiB
C
183 lines
4.7 KiB
C
/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2015 WIZnet Co.,Ltd. All rights reserved.
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* All rights reserved.
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of ARM Limited 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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 OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************
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*/
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#include "mbed_assert.h"
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#include "i2c_api.h"
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#if DEVICE_I2C
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#include "cmsis.h"
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#include "pinmap.h"
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#include "PeripheralPins.h"
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#include "mbed_wait_api.h"
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#include "us_ticker_api.h"
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#include "W7500x_i2c.h"
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/* Timeout values for flags and events waiting loops. These timeouts are
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not based on accurate values, they just guarantee that the application will
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not remain stuck if the I2C communication is corrupted. */
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#define FLAG_TIMEOUT ((int)0x1000)
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#define LONG_TIMEOUT ((int)0xFFFF)
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void i2c_init(i2c_t *obj, PinName sda, PinName scl)
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{
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I2C_ConfigStruct conf;
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//Determine the I2C to use
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I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
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I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
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obj->I2Cx = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
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MBED_ASSERT(obj->I2Cx != (I2CName)NC);
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obj->sda = sda;
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obj->scl = scl;
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obj->ADDRESS = 0x0;
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obj->is_setAddress = 0;
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conf.sda = (I2C_PinName)obj->sda;
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conf.scl = (I2C_PinName)obj->scl;
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I2C_Init(&conf);
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}
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void i2c_frequency(i2c_t *obj, int hz)
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{
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}
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inline int i2c_start(i2c_t *obj)
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{
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I2C_ConfigStruct conf;
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conf.sda = (I2C_PinName)obj->sda;
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conf.scl = (I2C_PinName)obj->scl;
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I2C_Start(&conf);
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return 0;
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}
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inline int i2c_stop(i2c_t *obj)
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{
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I2C_ConfigStruct conf;
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conf.sda = (I2C_PinName)obj->sda;
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conf.scl = (I2C_PinName)obj->scl;
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I2C_Stop(&conf);
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return 0;
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}
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int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
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{
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I2C_ConfigStruct conf;
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conf.sda = (I2C_PinName)obj->sda;
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conf.scl = (I2C_PinName)obj->scl;
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if(stop)
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{
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if(I2C_Read(&conf, address, (uint8_t*)data, length) != 0)
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return -1;
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}
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else
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{
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if(I2C_ReadRepeated(&conf, address, (uint8_t*)data, length) != 0)
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return -1;
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}
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return length;
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}
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int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
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{
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I2C_ConfigStruct conf;
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conf.sda = (I2C_PinName)obj->sda;
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conf.scl = (I2C_PinName)obj->scl;
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if(stop)
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{
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if(I2C_Write(&conf, address, (uint8_t*)data, length) != 0)
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return -1;
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}
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else
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{
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if(I2C_WriteRepeated(&conf, address, (uint8_t*)data, length) != 0)
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return -1;
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}
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return length;
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}
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int i2c_byte_read(i2c_t *obj, int last)
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{
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uint8_t ret;
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I2C_ConfigStruct conf;
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conf.sda = (I2C_PinName)obj->sda;
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conf.scl = (I2C_PinName)obj->scl;
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ret = I2C_ReadByte(&conf);
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if(last)
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I2C_SendNACK(&conf);
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else
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I2C_SendACK(&conf);
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return (int)ret;
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}
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int i2c_byte_write(i2c_t *obj, int data)
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{
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I2C_ConfigStruct conf;
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conf.sda = (I2C_PinName)obj->sda;
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conf.scl = (I2C_PinName)obj->scl;
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if(I2C_WriteByte(&conf, (uint8_t)data)) // NACK
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return 0;
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else //ack
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return 1;
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}
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void i2c_reset(i2c_t *obj)
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{
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}
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#endif // DEVICE_I2C
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