Mouse code for the MacroRat
mbed-dev/targets/TARGET_ONSEMI/TARGET_NCS36510/i2c_api.c@46:b156ef445742, 2017-06-03 (annotated)
- Committer:
- sahilmgandhi
- Date:
- Sat Jun 03 00:22:44 2017 +0000
- Revision:
- 46:b156ef445742
- Parent:
- 18:6a4db94011d3
Final code for internal battlebot competition.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
sahilmgandhi | 18:6a4db94011d3 | 1 | /** |
sahilmgandhi | 18:6a4db94011d3 | 2 | ******************************************************************************* |
sahilmgandhi | 18:6a4db94011d3 | 3 | * @file i2c.c |
sahilmgandhi | 18:6a4db94011d3 | 4 | * @brief Implementation of an i2c api |
sahilmgandhi | 18:6a4db94011d3 | 5 | * @internal |
sahilmgandhi | 18:6a4db94011d3 | 6 | * @author ON Semiconductor |
sahilmgandhi | 18:6a4db94011d3 | 7 | * $Rev: 3525 $ |
sahilmgandhi | 18:6a4db94011d3 | 8 | * $Date: 2015-07-20 15:24:25 +0530 (Mon, 20 Jul 2015) $ |
sahilmgandhi | 18:6a4db94011d3 | 9 | ****************************************************************************** |
sahilmgandhi | 18:6a4db94011d3 | 10 | * Copyright 2016 Semiconductor Components Industries LLC (d/b/a ON Semiconductor). |
sahilmgandhi | 18:6a4db94011d3 | 11 | * All rights reserved. This software and/or documentation is licensed by ON Semiconductor |
sahilmgandhi | 18:6a4db94011d3 | 12 | * under limited terms and conditions. The terms and conditions pertaining to the software |
sahilmgandhi | 18:6a4db94011d3 | 13 | * and/or documentation are available at http://www.onsemi.com/site/pdf/ONSEMI_T&C.pdf |
sahilmgandhi | 18:6a4db94011d3 | 14 | * (ON Semiconductor Standard Terms and Conditions of Sale, Section 8 Software) and |
sahilmgandhi | 18:6a4db94011d3 | 15 | * if applicable the software license agreement. Do not use this software and/or |
sahilmgandhi | 18:6a4db94011d3 | 16 | * documentation unless you have carefully read and you agree to the limited terms and |
sahilmgandhi | 18:6a4db94011d3 | 17 | * conditions. By using this software and/or documentation, you agree to the limited |
sahilmgandhi | 18:6a4db94011d3 | 18 | * terms and conditions. |
sahilmgandhi | 18:6a4db94011d3 | 19 | * |
sahilmgandhi | 18:6a4db94011d3 | 20 | * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED |
sahilmgandhi | 18:6a4db94011d3 | 21 | * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF |
sahilmgandhi | 18:6a4db94011d3 | 22 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. |
sahilmgandhi | 18:6a4db94011d3 | 23 | * ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, |
sahilmgandhi | 18:6a4db94011d3 | 24 | * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. |
sahilmgandhi | 18:6a4db94011d3 | 25 | * @endinternal |
sahilmgandhi | 18:6a4db94011d3 | 26 | * |
sahilmgandhi | 18:6a4db94011d3 | 27 | * @ingroup i2c |
sahilmgandhi | 18:6a4db94011d3 | 28 | * |
sahilmgandhi | 18:6a4db94011d3 | 29 | */ |
sahilmgandhi | 18:6a4db94011d3 | 30 | #if DEVICE_I2C |
sahilmgandhi | 18:6a4db94011d3 | 31 | |
sahilmgandhi | 18:6a4db94011d3 | 32 | #include "i2c.h" |
sahilmgandhi | 18:6a4db94011d3 | 33 | #include "i2c_api.h" |
sahilmgandhi | 18:6a4db94011d3 | 34 | #include "mbed_wait_api.h" |
sahilmgandhi | 18:6a4db94011d3 | 35 | |
sahilmgandhi | 18:6a4db94011d3 | 36 | #define I2C_READ_WRITE_BIT_MASK 0xFE |
sahilmgandhi | 18:6a4db94011d3 | 37 | |
sahilmgandhi | 18:6a4db94011d3 | 38 | /* See i2c_api.h for details */ |
sahilmgandhi | 18:6a4db94011d3 | 39 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) |
sahilmgandhi | 18:6a4db94011d3 | 40 | { |
sahilmgandhi | 18:6a4db94011d3 | 41 | fI2cInit(obj, sda, scl); |
sahilmgandhi | 18:6a4db94011d3 | 42 | } |
sahilmgandhi | 18:6a4db94011d3 | 43 | |
sahilmgandhi | 18:6a4db94011d3 | 44 | /* See i2c_api.h for details */ |
sahilmgandhi | 18:6a4db94011d3 | 45 | void i2c_frequency(i2c_t *obj, int hz) |
sahilmgandhi | 18:6a4db94011d3 | 46 | { |
sahilmgandhi | 18:6a4db94011d3 | 47 | fI2cFrequency(obj, hz); |
sahilmgandhi | 18:6a4db94011d3 | 48 | } |
sahilmgandhi | 18:6a4db94011d3 | 49 | |
sahilmgandhi | 18:6a4db94011d3 | 50 | /* See i2c_api.h for details */ |
sahilmgandhi | 18:6a4db94011d3 | 51 | int i2c_start(i2c_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 52 | { |
sahilmgandhi | 18:6a4db94011d3 | 53 | return(fI2cStart(obj)); |
sahilmgandhi | 18:6a4db94011d3 | 54 | } |
sahilmgandhi | 18:6a4db94011d3 | 55 | |
sahilmgandhi | 18:6a4db94011d3 | 56 | /* See i2c_api.h for details */ |
sahilmgandhi | 18:6a4db94011d3 | 57 | int i2c_stop(i2c_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 58 | { |
sahilmgandhi | 18:6a4db94011d3 | 59 | return(fI2cStop(obj)); |
sahilmgandhi | 18:6a4db94011d3 | 60 | } |
sahilmgandhi | 18:6a4db94011d3 | 61 | |
sahilmgandhi | 18:6a4db94011d3 | 62 | /* See i2c_api.h for details */ |
sahilmgandhi | 18:6a4db94011d3 | 63 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) |
sahilmgandhi | 18:6a4db94011d3 | 64 | { |
sahilmgandhi | 18:6a4db94011d3 | 65 | /* TODO address parameter not usable */ |
sahilmgandhi | 18:6a4db94011d3 | 66 | int Count, status; |
sahilmgandhi | 18:6a4db94011d3 | 67 | const char WriteData = (address | (~I2C_READ_WRITE_BIT_MASK)) & 0xFF; |
sahilmgandhi | 18:6a4db94011d3 | 68 | |
sahilmgandhi | 18:6a4db94011d3 | 69 | /* Send start bit */ |
sahilmgandhi | 18:6a4db94011d3 | 70 | status = fI2cStart(obj); |
sahilmgandhi | 18:6a4db94011d3 | 71 | if(status) { |
sahilmgandhi | 18:6a4db94011d3 | 72 | /* Error sending start bit */ |
sahilmgandhi | 18:6a4db94011d3 | 73 | return status; |
sahilmgandhi | 18:6a4db94011d3 | 74 | } |
sahilmgandhi | 18:6a4db94011d3 | 75 | |
sahilmgandhi | 18:6a4db94011d3 | 76 | /* Send address | read */ |
sahilmgandhi | 18:6a4db94011d3 | 77 | Count = fI2cWriteB(obj, &WriteData, 1); |
sahilmgandhi | 18:6a4db94011d3 | 78 | if(Count != 1) { |
sahilmgandhi | 18:6a4db94011d3 | 79 | /* Error sending address */ |
sahilmgandhi | 18:6a4db94011d3 | 80 | return Count; |
sahilmgandhi | 18:6a4db94011d3 | 81 | } |
sahilmgandhi | 18:6a4db94011d3 | 82 | |
sahilmgandhi | 18:6a4db94011d3 | 83 | /* Send command/s */ |
sahilmgandhi | 18:6a4db94011d3 | 84 | Count = fI2cReadB(obj, data, length); |
sahilmgandhi | 18:6a4db94011d3 | 85 | if(Count != length) { |
sahilmgandhi | 18:6a4db94011d3 | 86 | /* Error sending coomand/s */ |
sahilmgandhi | 18:6a4db94011d3 | 87 | return Count; |
sahilmgandhi | 18:6a4db94011d3 | 88 | } |
sahilmgandhi | 18:6a4db94011d3 | 89 | if(stop) { /* Send stop bit if requested */ |
sahilmgandhi | 18:6a4db94011d3 | 90 | status = fI2cStop(obj); |
sahilmgandhi | 18:6a4db94011d3 | 91 | if(status) { |
sahilmgandhi | 18:6a4db94011d3 | 92 | /* Error sending stop bit */ |
sahilmgandhi | 18:6a4db94011d3 | 93 | return status; |
sahilmgandhi | 18:6a4db94011d3 | 94 | } |
sahilmgandhi | 18:6a4db94011d3 | 95 | } |
sahilmgandhi | 18:6a4db94011d3 | 96 | return Count; |
sahilmgandhi | 18:6a4db94011d3 | 97 | } |
sahilmgandhi | 18:6a4db94011d3 | 98 | |
sahilmgandhi | 18:6a4db94011d3 | 99 | /* See i2c_api.h for details */ |
sahilmgandhi | 18:6a4db94011d3 | 100 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) |
sahilmgandhi | 18:6a4db94011d3 | 101 | { |
sahilmgandhi | 18:6a4db94011d3 | 102 | int Count, status; |
sahilmgandhi | 18:6a4db94011d3 | 103 | const char WriteData = (address & I2C_READ_WRITE_BIT_MASK) & 0xFF; |
sahilmgandhi | 18:6a4db94011d3 | 104 | |
sahilmgandhi | 18:6a4db94011d3 | 105 | /* Send start bit */ |
sahilmgandhi | 18:6a4db94011d3 | 106 | status = fI2cStart(obj); |
sahilmgandhi | 18:6a4db94011d3 | 107 | if(status) { |
sahilmgandhi | 18:6a4db94011d3 | 108 | /* Error sending start bit */ |
sahilmgandhi | 18:6a4db94011d3 | 109 | return status; |
sahilmgandhi | 18:6a4db94011d3 | 110 | } |
sahilmgandhi | 18:6a4db94011d3 | 111 | |
sahilmgandhi | 18:6a4db94011d3 | 112 | /* Send address | write */ |
sahilmgandhi | 18:6a4db94011d3 | 113 | Count = fI2cWriteB(obj, &WriteData, 1); |
sahilmgandhi | 18:6a4db94011d3 | 114 | if(Count != 1) { |
sahilmgandhi | 18:6a4db94011d3 | 115 | /* Error sending address */ |
sahilmgandhi | 18:6a4db94011d3 | 116 | return Count; |
sahilmgandhi | 18:6a4db94011d3 | 117 | } |
sahilmgandhi | 18:6a4db94011d3 | 118 | |
sahilmgandhi | 18:6a4db94011d3 | 119 | /* Sens command, [data] */ |
sahilmgandhi | 18:6a4db94011d3 | 120 | Count = fI2cWriteB(obj, data, length); |
sahilmgandhi | 18:6a4db94011d3 | 121 | if(Count != length) { |
sahilmgandhi | 18:6a4db94011d3 | 122 | /* Error sending address */ |
sahilmgandhi | 18:6a4db94011d3 | 123 | return Count; |
sahilmgandhi | 18:6a4db94011d3 | 124 | } |
sahilmgandhi | 18:6a4db94011d3 | 125 | |
sahilmgandhi | 18:6a4db94011d3 | 126 | if(stop) { /* If stop requested */ |
sahilmgandhi | 18:6a4db94011d3 | 127 | /* Send stop bit */ |
sahilmgandhi | 18:6a4db94011d3 | 128 | status = fI2cStop(obj); |
sahilmgandhi | 18:6a4db94011d3 | 129 | if(status) { |
sahilmgandhi | 18:6a4db94011d3 | 130 | /* Error sending stop bit */ |
sahilmgandhi | 18:6a4db94011d3 | 131 | return status; |
sahilmgandhi | 18:6a4db94011d3 | 132 | } |
sahilmgandhi | 18:6a4db94011d3 | 133 | } |
sahilmgandhi | 18:6a4db94011d3 | 134 | return Count; |
sahilmgandhi | 18:6a4db94011d3 | 135 | } |
sahilmgandhi | 18:6a4db94011d3 | 136 | |
sahilmgandhi | 18:6a4db94011d3 | 137 | /* See i2c_api.h for details */ |
sahilmgandhi | 18:6a4db94011d3 | 138 | void i2c_reset(i2c_t *obj) |
sahilmgandhi | 18:6a4db94011d3 | 139 | { |
sahilmgandhi | 18:6a4db94011d3 | 140 | (void)fI2cStop(obj); |
sahilmgandhi | 18:6a4db94011d3 | 141 | } |
sahilmgandhi | 18:6a4db94011d3 | 142 | |
sahilmgandhi | 18:6a4db94011d3 | 143 | /* See i2c_api.h for details */ |
sahilmgandhi | 18:6a4db94011d3 | 144 | int i2c_byte_read(i2c_t *obj, int last) /* TODO return size can be uint8_t */ |
sahilmgandhi | 18:6a4db94011d3 | 145 | { |
sahilmgandhi | 18:6a4db94011d3 | 146 | int Count; |
sahilmgandhi | 18:6a4db94011d3 | 147 | char data; |
sahilmgandhi | 18:6a4db94011d3 | 148 | Count = fI2cReadB(obj, &data, 1); |
sahilmgandhi | 18:6a4db94011d3 | 149 | if(Count != 1) { |
sahilmgandhi | 18:6a4db94011d3 | 150 | /* Error */ |
sahilmgandhi | 18:6a4db94011d3 | 151 | return Count; |
sahilmgandhi | 18:6a4db94011d3 | 152 | } |
sahilmgandhi | 18:6a4db94011d3 | 153 | if(last) { |
sahilmgandhi | 18:6a4db94011d3 | 154 | /* ACK */ |
sahilmgandhi | 18:6a4db94011d3 | 155 | SEND_COMMAND(I2C_CMD_WDAT0); |
sahilmgandhi | 18:6a4db94011d3 | 156 | } else { |
sahilmgandhi | 18:6a4db94011d3 | 157 | /* No ACK */ |
sahilmgandhi | 18:6a4db94011d3 | 158 | SEND_COMMAND(I2C_CMD_WDAT1); |
sahilmgandhi | 18:6a4db94011d3 | 159 | } |
sahilmgandhi | 18:6a4db94011d3 | 160 | return data; |
sahilmgandhi | 18:6a4db94011d3 | 161 | } |
sahilmgandhi | 18:6a4db94011d3 | 162 | |
sahilmgandhi | 18:6a4db94011d3 | 163 | /* See i2c_api.h for details */ |
sahilmgandhi | 18:6a4db94011d3 | 164 | int i2c_byte_write(i2c_t *obj, int data) |
sahilmgandhi | 18:6a4db94011d3 | 165 | { |
sahilmgandhi | 18:6a4db94011d3 | 166 | int Count; |
sahilmgandhi | 18:6a4db94011d3 | 167 | Count = fI2cWriteB(obj, (const char *)&data, 1); |
sahilmgandhi | 18:6a4db94011d3 | 168 | if(Count != 1) { |
sahilmgandhi | 18:6a4db94011d3 | 169 | return Count; |
sahilmgandhi | 18:6a4db94011d3 | 170 | } |
sahilmgandhi | 18:6a4db94011d3 | 171 | |
sahilmgandhi | 18:6a4db94011d3 | 172 | while(obj->membase->STATUS.WORD & I2C_STATUS_CMD_FIFO_OFL_BIT); /* Wait till command overflow ends */ |
sahilmgandhi | 18:6a4db94011d3 | 173 | |
sahilmgandhi | 18:6a4db94011d3 | 174 | if(obj->membase->STATUS.WORD & I2C_STATUS_BUS_ERR_BIT) { |
sahilmgandhi | 18:6a4db94011d3 | 175 | /* Bus error means NAK received */ |
sahilmgandhi | 18:6a4db94011d3 | 176 | return 0; |
sahilmgandhi | 18:6a4db94011d3 | 177 | } else { |
sahilmgandhi | 18:6a4db94011d3 | 178 | /* ACK received */ |
sahilmgandhi | 18:6a4db94011d3 | 179 | return 1; |
sahilmgandhi | 18:6a4db94011d3 | 180 | } |
sahilmgandhi | 18:6a4db94011d3 | 181 | } |
sahilmgandhi | 18:6a4db94011d3 | 182 | |
sahilmgandhi | 18:6a4db94011d3 | 183 | #endif /* DEVICE_I2C */ |