mirror of https://github.com/ARMmbed/mbed-os.git
247 lines
6.8 KiB
C
247 lines
6.8 KiB
C
/*******************************************************************************
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* Copyright (c) Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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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 "i2c_regs.h"
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#include "mxc_i2c.h"
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#include "pinmap.h"
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#include "PeripheralPins.h"
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#ifndef MXC_I2CM_RX_TIMEOUT
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#define MXC_I2CM_RX_TIMEOUT 0x5000
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#endif
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#ifndef I2C_ERROR
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#define I2C_ERROR (MXC_F_I2C_INT_FL0_ARB_ER | MXC_F_I2C_INT_FL0_TO_ER | MXC_F_I2C_INT_FL0_ADDR_NACK_ER | \
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MXC_F_I2C_INT_FL0_DATA_ER | MXC_F_I2C_INT_FL0_DO_NOT_RESP_ER | MXC_F_I2C_INT_FL0_START_ER | \
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MXC_F_I2C_INT_FL0_STOP_ER)
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#endif
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#define MBED_NAK 0
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#define MBED_ACK 1
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#define MBED_TIMEOUT 2
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//******************************************************************************
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void i2c_init(i2c_t *obj, PinName sda, PinName scl)
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{
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// SDA and SCL must map to same peripheral instance
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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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mxc_i2c_regs_t *i2c = (mxc_i2c_regs_t*)pinmap_merge(i2c_sda, i2c_scl);
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MBED_ASSERT((int)i2c != NC);
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obj->i2c = i2c;
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obj->start_pending = 0;
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MXC_I2C_Shutdown(obj->i2c);
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MXC_I2C_Init(obj->i2c, 1, 0);// configure as master
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}
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//******************************************************************************
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void i2c_frequency(i2c_t *obj, int hz)
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{
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MXC_I2C_SetFrequency(obj->i2c, hz);
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}
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//******************************************************************************
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int i2c_start(i2c_t *obj)
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{
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int ret;
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ret = MXC_I2C_Start(obj->i2c);
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if (ret != 0) {
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//...
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}
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return ret;
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}
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//******************************************************************************
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int i2c_stop(i2c_t *obj)
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{
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int ret;
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ret = MXC_I2C_Stop(obj->i2c);
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if (ret != 0) {
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//...
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}
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return ret;
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}
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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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int ret = 0;
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mxc_i2c_req_t reqMaster;
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reqMaster.i2c = obj->i2c;
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reqMaster.addr = address;
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reqMaster.tx_buf = NULL;
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reqMaster.tx_len = 0;
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reqMaster.rx_buf = (unsigned char *)data;
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reqMaster.rx_len = length;
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reqMaster.restart = !stop;
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reqMaster.callback = NULL;
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ret = MXC_I2C_MasterTransaction(&reqMaster);
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if (ret == 0) {
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ret = length;
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}
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return ret;
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}
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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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int ret = 0;
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mxc_i2c_req_t reqMaster;
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reqMaster.i2c = obj->i2c;
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reqMaster.addr = address;
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reqMaster.tx_buf = (unsigned char *)data;
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reqMaster.tx_len = length;
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reqMaster.rx_buf = NULL;
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reqMaster.rx_len = 0;
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reqMaster.restart = !stop;
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reqMaster.callback = NULL;
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ret = MXC_I2C_MasterTransaction(&reqMaster);
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if (ret == 0) {
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ret = length;
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}
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return ret;
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}
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//******************************************************************************
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void i2c_reset(i2c_t *obj)
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{
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MXC_I2C_Recover(obj->i2c, 5);
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}
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//******************************************************************************
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int i2c_byte_read(i2c_t *obj, int ack)
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{
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unsigned char byt = 0;
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MXC_I2C_ReadByte(obj->i2c, &byt, ack);
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return byt;
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}
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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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int ret;
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ret = MXC_I2C_WriteByte(obj->i2c, (unsigned char)data);
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/*
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Functions returns:
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=0 if byte is acknowledged,
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=1 if not acknowledged,
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<0 if error
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*/
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// Convert return value
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if (ret == 0) {
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ret = MBED_ACK; // ACK Receviced
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} else if (ret == 1) {
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ret = MBED_NAK; // NAK Received
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} else {
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//... Error
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}
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return ret;
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}
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//******************************************************************************
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const PinMap *i2c_master_sda_pinmap()
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{
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return PinMap_I2C_SDA;
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}
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//******************************************************************************
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const PinMap *i2c_master_scl_pinmap()
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{
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return PinMap_I2C_SCL;
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}
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//******************************************************************************
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const PinMap *i2c_slave_sda_pinmap()
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{
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return PinMap_I2C_SDA;
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}
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//******************************************************************************
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const PinMap *i2c_slave_scl_pinmap()
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{
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return PinMap_I2C_SCL;
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}
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#if 0 // DEVICE_I2CSLAVE
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//******************************************************************************
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void i2c_slave_mode(i2c_t *obj, int enable_slave)
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{
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}
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//******************************************************************************
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int i2c_slave_receive(i2c_t *obj)
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{
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}
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//******************************************************************************
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int i2c_slave_read(i2c_t *obj, char *data, int length)
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{
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}
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//******************************************************************************
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int i2c_slave_write(i2c_t *obj, const char *data, int length)
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{
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}
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//******************************************************************************
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void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
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{
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}
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#endif
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#endif // #if DEVICE_I2C
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