Mouse code for the MacroRat
Diff: mbed-dev/targets/TARGET_ONSEMI/TARGET_NCS36510/i2c_api.c
- Revision:
- 18:6a4db94011d3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_ONSEMI/TARGET_NCS36510/i2c_api.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,183 @@ +/** + ******************************************************************************* + * @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 "mbed_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 */ \ No newline at end of file