t
Fork of mbed-dev by
targets/TARGET_ONSEMI/TARGET_NCS36510/i2c_api.c
- Committer:
- <>
- Date:
- 2017-02-28
- Revision:
- 159:612c381a210f
- Parent:
- 149:156823d33999
- Child:
- 160:d5399cc887bb
File content as of revision 159:612c381a210f:
/** ******************************************************************************* * @file i2c.c * @brief Implementation of an i2c api * @internal * @author ON Semiconductor * $Rev: 3525 $ * $Date: 2015-07-20 15:24:25 +0530 (Mon, 20 Jul 2015) $ ****************************************************************************** * Copyright 2016 Semiconductor Components Industries LLC (d/b/a ON Semiconductor). * All rights reserved. This software and/or documentation is licensed by ON Semiconductor * under limited terms and conditions. The terms and conditions pertaining to the software * and/or documentation are available at http://www.onsemi.com/site/pdf/ONSEMI_T&C.pdf * (ON Semiconductor Standard Terms and Conditions of Sale, Section 8 Software) and * if applicable the software license agreement. Do not use this software and/or * documentation unless you have carefully read and you agree to the limited terms and * conditions. By using this software and/or documentation, you agree to the limited * terms and conditions. * * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. * ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. * @endinternal * * @ingroup i2c * */ #if DEVICE_I2C #include "i2c.h" #include "i2c_api.h" #include "wait_api.h" #define I2C_READ_WRITE_BIT_MASK 0xFE /* See i2c_api.h for details */ void i2c_init(i2c_t *obj, PinName sda, PinName scl) { fI2cInit(obj, sda, scl); } /* See i2c_api.h for details */ void i2c_frequency(i2c_t *obj, int hz) { fI2cFrequency(obj, hz); } /* See i2c_api.h for details */ int i2c_start(i2c_t *obj) { return(fI2cStart(obj)); } /* See i2c_api.h for details */ int i2c_stop(i2c_t *obj) { return(fI2cStop(obj)); } /* See i2c_api.h for details */ int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) { /* TODO address parameter not usable */ int Count, status; const char WriteData = (address | (~I2C_READ_WRITE_BIT_MASK)) & 0xFF; /* Send start bit */ status = fI2cStart(obj); if(status) { /* Error sending start bit */ return status; } /* Send address | read */ Count = fI2cWriteB(obj, &WriteData, 1); if(Count != 1) { /* Error sending address */ return Count; } /* Send command/s */ Count = fI2cReadB(obj, data, length); if(Count != length) { /* Error sending coomand/s */ return Count; } if(stop) { /* Send stop bit if requested */ status = fI2cStop(obj); if(status) { /* Error sending stop bit */ return status; } } return Count; } /* See i2c_api.h for details */ int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) { int Count, status; const char WriteData = (address & I2C_READ_WRITE_BIT_MASK) & 0xFF; /* Send start bit */ status = fI2cStart(obj); if(status) { /* Error sending start bit */ return status; } /* Send address | write */ Count = fI2cWriteB(obj, &WriteData, 1); if(Count != 1) { /* Error sending address */ return Count; } /* Sens command, [data] */ Count = fI2cWriteB(obj, data, length); if(Count != length) { /* Error sending address */ return Count; } if(stop) { /* If stop requested */ /* Send stop bit */ status = fI2cStop(obj); if(status) { /* Error sending stop bit */ return status; } } return Count; } /* See i2c_api.h for details */ void i2c_reset(i2c_t *obj) { (void)fI2cStop(obj); } /* See i2c_api.h for details */ int i2c_byte_read(i2c_t *obj, int last) /* TODO return size can be uint8_t */ { int Count; char data; Count = fI2cReadB(obj, &data, 1); if(Count != 1) { /* Error */ return Count; } if(last) { /* ACK */ SEND_COMMAND(I2C_CMD_WDAT0); } else { /* No ACK */ SEND_COMMAND(I2C_CMD_WDAT1); } return data; } /* See i2c_api.h for details */ int i2c_byte_write(i2c_t *obj, int data) { int Count; Count = fI2cWriteB(obj, (const char *)&data, 1); if(Count != 1) { return Count; } while(obj->membase->STATUS.WORD & I2C_STATUS_CMD_FIFO_OFL_BIT); /* Wait till command overflow ends */ if(obj->membase->STATUS.WORD & I2C_STATUS_BUS_ERR_BIT) { /* Bus error means NAK received */ return 0; } else { /* ACK received */ return 1; } } #endif /* DEVICE_I2C */