MacroRat / MouseCode

Mouse code for the MacroRat

Dependencies:   ITG3200 QEI

mbed-dev/targets/TARGET_NXP/TARGET_LPC43XX/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?

UserRevisionLine numberNew contents of line
sahilmgandhi 18:6a4db94011d3 1 /* mbed Microcontroller Library
sahilmgandhi 18:6a4db94011d3 2 * Copyright (c) 2006-2013 ARM Limited
sahilmgandhi 18:6a4db94011d3 3 *
sahilmgandhi 18:6a4db94011d3 4 * Licensed under the Apache License, Version 2.0 (the "License");
sahilmgandhi 18:6a4db94011d3 5 * you may not use this file except in compliance with the License.
sahilmgandhi 18:6a4db94011d3 6 * You may obtain a copy of the License at
sahilmgandhi 18:6a4db94011d3 7 *
sahilmgandhi 18:6a4db94011d3 8 * http://www.apache.org/licenses/LICENSE-2.0
sahilmgandhi 18:6a4db94011d3 9 *
sahilmgandhi 18:6a4db94011d3 10 * Unless required by applicable law or agreed to in writing, software
sahilmgandhi 18:6a4db94011d3 11 * distributed under the License is distributed on an "AS IS" BASIS,
sahilmgandhi 18:6a4db94011d3 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
sahilmgandhi 18:6a4db94011d3 13 * See the License for the specific language governing permissions and
sahilmgandhi 18:6a4db94011d3 14 * limitations under the License.
sahilmgandhi 18:6a4db94011d3 15 *
sahilmgandhi 18:6a4db94011d3 16 * Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
sahilmgandhi 18:6a4db94011d3 17 */
sahilmgandhi 18:6a4db94011d3 18 #include "i2c_api.h"
sahilmgandhi 18:6a4db94011d3 19 #include "cmsis.h"
sahilmgandhi 18:6a4db94011d3 20 #include "pinmap.h"
sahilmgandhi 18:6a4db94011d3 21 #include "mbed_error.h"
sahilmgandhi 18:6a4db94011d3 22
sahilmgandhi 18:6a4db94011d3 23 // SCU mode for I2C SCL/SDA pins
sahilmgandhi 18:6a4db94011d3 24 #define SCU_PINIO_I2C SCU_PINIO_PULLNONE
sahilmgandhi 18:6a4db94011d3 25
sahilmgandhi 18:6a4db94011d3 26 static const PinMap PinMap_I2C_SDA[] = {
sahilmgandhi 18:6a4db94011d3 27 {P_DED, I2C_0, 0},
sahilmgandhi 18:6a4db94011d3 28 {P2_3, I2C_1, (SCU_PINIO_I2C | 1)},
sahilmgandhi 18:6a4db94011d3 29 {PE_13, I2C_1, (SCU_PINIO_I2C | 2)},
sahilmgandhi 18:6a4db94011d3 30 {NC, NC, 0}
sahilmgandhi 18:6a4db94011d3 31 };
sahilmgandhi 18:6a4db94011d3 32
sahilmgandhi 18:6a4db94011d3 33 static const PinMap PinMap_I2C_SCL[] = {
sahilmgandhi 18:6a4db94011d3 34 {P_DED, I2C_0, 0},
sahilmgandhi 18:6a4db94011d3 35 {P2_4, I2C_1, (SCU_PINIO_I2C | 1)},
sahilmgandhi 18:6a4db94011d3 36 {PE_14, I2C_1, (SCU_PINIO_I2C | 2)},
sahilmgandhi 18:6a4db94011d3 37 {NC, NC, 0}
sahilmgandhi 18:6a4db94011d3 38 };
sahilmgandhi 18:6a4db94011d3 39
sahilmgandhi 18:6a4db94011d3 40 #define I2C_CONSET(x) (x->i2c->CONSET)
sahilmgandhi 18:6a4db94011d3 41 #define I2C_CONCLR(x) (x->i2c->CONCLR)
sahilmgandhi 18:6a4db94011d3 42 #define I2C_STAT(x) (x->i2c->STAT)
sahilmgandhi 18:6a4db94011d3 43 #define I2C_DAT(x) (x->i2c->DAT)
sahilmgandhi 18:6a4db94011d3 44 #define I2C_SCLL(x, val) (x->i2c->SCLL = val)
sahilmgandhi 18:6a4db94011d3 45 #define I2C_SCLH(x, val) (x->i2c->SCLH = val)
sahilmgandhi 18:6a4db94011d3 46
sahilmgandhi 18:6a4db94011d3 47 static const uint32_t I2C_addr_offset[2][4] = {
sahilmgandhi 18:6a4db94011d3 48 {0x0C, 0x20, 0x24, 0x28},
sahilmgandhi 18:6a4db94011d3 49 {0x30, 0x34, 0x38, 0x3C}
sahilmgandhi 18:6a4db94011d3 50 };
sahilmgandhi 18:6a4db94011d3 51
sahilmgandhi 18:6a4db94011d3 52 static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
sahilmgandhi 18:6a4db94011d3 53 I2C_CONCLR(obj) = (start << 5)
sahilmgandhi 18:6a4db94011d3 54 | (stop << 4)
sahilmgandhi 18:6a4db94011d3 55 | (interrupt << 3)
sahilmgandhi 18:6a4db94011d3 56 | (acknowledge << 2);
sahilmgandhi 18:6a4db94011d3 57 }
sahilmgandhi 18:6a4db94011d3 58
sahilmgandhi 18:6a4db94011d3 59 static inline void i2c_conset(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
sahilmgandhi 18:6a4db94011d3 60 I2C_CONSET(obj) = (start << 5)
sahilmgandhi 18:6a4db94011d3 61 | (stop << 4)
sahilmgandhi 18:6a4db94011d3 62 | (interrupt << 3)
sahilmgandhi 18:6a4db94011d3 63 | (acknowledge << 2);
sahilmgandhi 18:6a4db94011d3 64 }
sahilmgandhi 18:6a4db94011d3 65
sahilmgandhi 18:6a4db94011d3 66 // Clear the Serial Interrupt (SI)
sahilmgandhi 18:6a4db94011d3 67 static inline void i2c_clear_SI(i2c_t *obj) {
sahilmgandhi 18:6a4db94011d3 68 i2c_conclr(obj, 0, 0, 1, 0);
sahilmgandhi 18:6a4db94011d3 69 }
sahilmgandhi 18:6a4db94011d3 70
sahilmgandhi 18:6a4db94011d3 71 static inline int i2c_status(i2c_t *obj) {
sahilmgandhi 18:6a4db94011d3 72 return I2C_STAT(obj);
sahilmgandhi 18:6a4db94011d3 73 }
sahilmgandhi 18:6a4db94011d3 74
sahilmgandhi 18:6a4db94011d3 75 // Wait until the Serial Interrupt (SI) is set
sahilmgandhi 18:6a4db94011d3 76 static int i2c_wait_SI(i2c_t *obj) {
sahilmgandhi 18:6a4db94011d3 77 int timeout = 0;
sahilmgandhi 18:6a4db94011d3 78 while (!(I2C_CONSET(obj) & (1 << 3))) {
sahilmgandhi 18:6a4db94011d3 79 timeout++;
sahilmgandhi 18:6a4db94011d3 80 if (timeout > 100000) return -1;
sahilmgandhi 18:6a4db94011d3 81 }
sahilmgandhi 18:6a4db94011d3 82 return 0;
sahilmgandhi 18:6a4db94011d3 83 }
sahilmgandhi 18:6a4db94011d3 84
sahilmgandhi 18:6a4db94011d3 85 static inline void i2c_interface_enable(i2c_t *obj) {
sahilmgandhi 18:6a4db94011d3 86 I2C_CONSET(obj) = 0x40;
sahilmgandhi 18:6a4db94011d3 87 }
sahilmgandhi 18:6a4db94011d3 88
sahilmgandhi 18:6a4db94011d3 89 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
sahilmgandhi 18:6a4db94011d3 90 // determine the SPI to use
sahilmgandhi 18:6a4db94011d3 91 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
sahilmgandhi 18:6a4db94011d3 92 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
sahilmgandhi 18:6a4db94011d3 93 obj->i2c = (LPC_I2C_T *)pinmap_merge(i2c_sda, i2c_scl);
sahilmgandhi 18:6a4db94011d3 94
sahilmgandhi 18:6a4db94011d3 95 if ((int)obj->i2c == NC) {
sahilmgandhi 18:6a4db94011d3 96 error("I2C pin mapping failed");
sahilmgandhi 18:6a4db94011d3 97 }
sahilmgandhi 18:6a4db94011d3 98
sahilmgandhi 18:6a4db94011d3 99 // set default frequency at 100k
sahilmgandhi 18:6a4db94011d3 100 i2c_frequency(obj, 100000);
sahilmgandhi 18:6a4db94011d3 101 i2c_conclr(obj, 1, 1, 1, 1);
sahilmgandhi 18:6a4db94011d3 102 i2c_interface_enable(obj);
sahilmgandhi 18:6a4db94011d3 103
sahilmgandhi 18:6a4db94011d3 104 // Set SCU functions
sahilmgandhi 18:6a4db94011d3 105 if (scl == P_DED) {
sahilmgandhi 18:6a4db94011d3 106 // Enable dedicated I2C0 SDA and SCL pins (open drain)
sahilmgandhi 18:6a4db94011d3 107 LPC_SCU->SFSI2C0 = (1 << 11) | (1 << 3);
sahilmgandhi 18:6a4db94011d3 108 } else {
sahilmgandhi 18:6a4db94011d3 109 pinmap_pinout(sda, PinMap_I2C_SDA);
sahilmgandhi 18:6a4db94011d3 110 pinmap_pinout(scl, PinMap_I2C_SCL);
sahilmgandhi 18:6a4db94011d3 111 }
sahilmgandhi 18:6a4db94011d3 112 }
sahilmgandhi 18:6a4db94011d3 113
sahilmgandhi 18:6a4db94011d3 114 inline int i2c_start(i2c_t *obj) {
sahilmgandhi 18:6a4db94011d3 115 int status = 0;
sahilmgandhi 18:6a4db94011d3 116 int isInterrupted = I2C_CONSET(obj) & (1 << 3);
sahilmgandhi 18:6a4db94011d3 117
sahilmgandhi 18:6a4db94011d3 118 // 8.1 Before master mode can be entered, I2CON must be initialised to:
sahilmgandhi 18:6a4db94011d3 119 // - I2EN STA STO SI AA - -
sahilmgandhi 18:6a4db94011d3 120 // - 1 0 0 x x - -
sahilmgandhi 18:6a4db94011d3 121 // if AA = 0, it can't enter slave mode
sahilmgandhi 18:6a4db94011d3 122 i2c_conclr(obj, 1, 1, 0, 1);
sahilmgandhi 18:6a4db94011d3 123
sahilmgandhi 18:6a4db94011d3 124 // The master mode may now be entered by setting the STA bit
sahilmgandhi 18:6a4db94011d3 125 // this will generate a start condition when the bus becomes free
sahilmgandhi 18:6a4db94011d3 126 i2c_conset(obj, 1, 0, 0, 1);
sahilmgandhi 18:6a4db94011d3 127 // Clearing SI bit when it wasn't set on entry can jump past state
sahilmgandhi 18:6a4db94011d3 128 // 0x10 or 0x08 and erroneously send uninitialized slave address.
sahilmgandhi 18:6a4db94011d3 129 if (isInterrupted)
sahilmgandhi 18:6a4db94011d3 130 i2c_clear_SI(obj);
sahilmgandhi 18:6a4db94011d3 131
sahilmgandhi 18:6a4db94011d3 132 i2c_wait_SI(obj);
sahilmgandhi 18:6a4db94011d3 133 status = i2c_status(obj);
sahilmgandhi 18:6a4db94011d3 134
sahilmgandhi 18:6a4db94011d3 135 // Clear start bit now that it's transmitted
sahilmgandhi 18:6a4db94011d3 136 i2c_conclr(obj, 1, 0, 0, 0);
sahilmgandhi 18:6a4db94011d3 137 return status;
sahilmgandhi 18:6a4db94011d3 138 }
sahilmgandhi 18:6a4db94011d3 139
sahilmgandhi 18:6a4db94011d3 140 inline int i2c_stop(i2c_t *obj) {
sahilmgandhi 18:6a4db94011d3 141 int timeout = 0;
sahilmgandhi 18:6a4db94011d3 142
sahilmgandhi 18:6a4db94011d3 143 // write the stop bit
sahilmgandhi 18:6a4db94011d3 144 i2c_conset(obj, 0, 1, 0, 0);
sahilmgandhi 18:6a4db94011d3 145 i2c_clear_SI(obj);
sahilmgandhi 18:6a4db94011d3 146
sahilmgandhi 18:6a4db94011d3 147 // wait for STO bit to reset
sahilmgandhi 18:6a4db94011d3 148 while(I2C_CONSET(obj) & (1 << 4)) {
sahilmgandhi 18:6a4db94011d3 149 timeout ++;
sahilmgandhi 18:6a4db94011d3 150 if (timeout > 100000) return 1;
sahilmgandhi 18:6a4db94011d3 151 }
sahilmgandhi 18:6a4db94011d3 152
sahilmgandhi 18:6a4db94011d3 153 return 0;
sahilmgandhi 18:6a4db94011d3 154 }
sahilmgandhi 18:6a4db94011d3 155
sahilmgandhi 18:6a4db94011d3 156 static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) {
sahilmgandhi 18:6a4db94011d3 157 // write the data
sahilmgandhi 18:6a4db94011d3 158 I2C_DAT(obj) = value;
sahilmgandhi 18:6a4db94011d3 159
sahilmgandhi 18:6a4db94011d3 160 // clear SI to init a send
sahilmgandhi 18:6a4db94011d3 161 i2c_clear_SI(obj);
sahilmgandhi 18:6a4db94011d3 162
sahilmgandhi 18:6a4db94011d3 163 // wait and return status
sahilmgandhi 18:6a4db94011d3 164 i2c_wait_SI(obj);
sahilmgandhi 18:6a4db94011d3 165 return i2c_status(obj);
sahilmgandhi 18:6a4db94011d3 166 }
sahilmgandhi 18:6a4db94011d3 167
sahilmgandhi 18:6a4db94011d3 168 static inline int i2c_do_read(i2c_t *obj, int last) {
sahilmgandhi 18:6a4db94011d3 169 // we are in state 0x40 (SLA+R tx'd) or 0x50 (data rx'd and ack)
sahilmgandhi 18:6a4db94011d3 170 if(last) {
sahilmgandhi 18:6a4db94011d3 171 i2c_conclr(obj, 0, 0, 0, 1); // send a NOT ACK
sahilmgandhi 18:6a4db94011d3 172 } else {
sahilmgandhi 18:6a4db94011d3 173 i2c_conset(obj, 0, 0, 0, 1); // send a ACK
sahilmgandhi 18:6a4db94011d3 174 }
sahilmgandhi 18:6a4db94011d3 175
sahilmgandhi 18:6a4db94011d3 176 // accept byte
sahilmgandhi 18:6a4db94011d3 177 i2c_clear_SI(obj);
sahilmgandhi 18:6a4db94011d3 178
sahilmgandhi 18:6a4db94011d3 179 // wait for it to arrive
sahilmgandhi 18:6a4db94011d3 180 i2c_wait_SI(obj);
sahilmgandhi 18:6a4db94011d3 181
sahilmgandhi 18:6a4db94011d3 182 // return the data
sahilmgandhi 18:6a4db94011d3 183 return (I2C_DAT(obj) & 0xFF);
sahilmgandhi 18:6a4db94011d3 184 }
sahilmgandhi 18:6a4db94011d3 185
sahilmgandhi 18:6a4db94011d3 186 void i2c_frequency(i2c_t *obj, int hz) {
sahilmgandhi 18:6a4db94011d3 187 // [TODO] set pclk to /4
sahilmgandhi 18:6a4db94011d3 188 uint32_t PCLK = SystemCoreClock / 4;
sahilmgandhi 18:6a4db94011d3 189
sahilmgandhi 18:6a4db94011d3 190 uint32_t pulse = PCLK / (hz * 2);
sahilmgandhi 18:6a4db94011d3 191
sahilmgandhi 18:6a4db94011d3 192 // I2C Rate
sahilmgandhi 18:6a4db94011d3 193 I2C_SCLL(obj, pulse);
sahilmgandhi 18:6a4db94011d3 194 I2C_SCLH(obj, pulse);
sahilmgandhi 18:6a4db94011d3 195 }
sahilmgandhi 18:6a4db94011d3 196
sahilmgandhi 18:6a4db94011d3 197 // The I2C does a read or a write as a whole operation
sahilmgandhi 18:6a4db94011d3 198 // There are two types of error conditions it can encounter
sahilmgandhi 18:6a4db94011d3 199 // 1) it can not obtain the bus
sahilmgandhi 18:6a4db94011d3 200 // 2) it gets error responses at part of the transmission
sahilmgandhi 18:6a4db94011d3 201 //
sahilmgandhi 18:6a4db94011d3 202 // We tackle them as follows:
sahilmgandhi 18:6a4db94011d3 203 // 1) we retry until we get the bus. we could have a "timeout" if we can not get it
sahilmgandhi 18:6a4db94011d3 204 // which basically turns it in to a 2)
sahilmgandhi 18:6a4db94011d3 205 // 2) on error, we use the standard error mechanisms to report/debug
sahilmgandhi 18:6a4db94011d3 206 //
sahilmgandhi 18:6a4db94011d3 207 // Therefore an I2C transaction should always complete. If it doesn't it is usually
sahilmgandhi 18:6a4db94011d3 208 // because something is setup wrong (e.g. wiring), and we don't need to programatically
sahilmgandhi 18:6a4db94011d3 209 // check for that
sahilmgandhi 18:6a4db94011d3 210
sahilmgandhi 18:6a4db94011d3 211 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
sahilmgandhi 18:6a4db94011d3 212 int count, status;
sahilmgandhi 18:6a4db94011d3 213
sahilmgandhi 18:6a4db94011d3 214 status = i2c_start(obj);
sahilmgandhi 18:6a4db94011d3 215
sahilmgandhi 18:6a4db94011d3 216 if ((status != 0x10) && (status != 0x08)) {
sahilmgandhi 18:6a4db94011d3 217 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 218 return I2C_ERROR_BUS_BUSY;
sahilmgandhi 18:6a4db94011d3 219 }
sahilmgandhi 18:6a4db94011d3 220
sahilmgandhi 18:6a4db94011d3 221 status = i2c_do_write(obj, (address | 0x01), 1);
sahilmgandhi 18:6a4db94011d3 222 if (status != 0x40) {
sahilmgandhi 18:6a4db94011d3 223 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 224 return I2C_ERROR_NO_SLAVE;
sahilmgandhi 18:6a4db94011d3 225 }
sahilmgandhi 18:6a4db94011d3 226
sahilmgandhi 18:6a4db94011d3 227 // Read in all except last byte
sahilmgandhi 18:6a4db94011d3 228 for (count = 0; count < (length - 1); count++) {
sahilmgandhi 18:6a4db94011d3 229 int value = i2c_do_read(obj, 0);
sahilmgandhi 18:6a4db94011d3 230 status = i2c_status(obj);
sahilmgandhi 18:6a4db94011d3 231 if (status != 0x50) {
sahilmgandhi 18:6a4db94011d3 232 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 233 return count;
sahilmgandhi 18:6a4db94011d3 234 }
sahilmgandhi 18:6a4db94011d3 235 data[count] = (char) value;
sahilmgandhi 18:6a4db94011d3 236 }
sahilmgandhi 18:6a4db94011d3 237
sahilmgandhi 18:6a4db94011d3 238 // read in last byte
sahilmgandhi 18:6a4db94011d3 239 int value = i2c_do_read(obj, 1);
sahilmgandhi 18:6a4db94011d3 240 status = i2c_status(obj);
sahilmgandhi 18:6a4db94011d3 241 if (status != 0x58) {
sahilmgandhi 18:6a4db94011d3 242 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 243 return length - 1;
sahilmgandhi 18:6a4db94011d3 244 }
sahilmgandhi 18:6a4db94011d3 245
sahilmgandhi 18:6a4db94011d3 246 data[count] = (char) value;
sahilmgandhi 18:6a4db94011d3 247
sahilmgandhi 18:6a4db94011d3 248 // If not repeated start, send stop.
sahilmgandhi 18:6a4db94011d3 249 if (stop) {
sahilmgandhi 18:6a4db94011d3 250 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 251 }
sahilmgandhi 18:6a4db94011d3 252
sahilmgandhi 18:6a4db94011d3 253 return length;
sahilmgandhi 18:6a4db94011d3 254 }
sahilmgandhi 18:6a4db94011d3 255
sahilmgandhi 18:6a4db94011d3 256 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
sahilmgandhi 18:6a4db94011d3 257 int i, status;
sahilmgandhi 18:6a4db94011d3 258
sahilmgandhi 18:6a4db94011d3 259 status = i2c_start(obj);
sahilmgandhi 18:6a4db94011d3 260
sahilmgandhi 18:6a4db94011d3 261 if ((status != 0x10) && (status != 0x08)) {
sahilmgandhi 18:6a4db94011d3 262 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 263 return I2C_ERROR_BUS_BUSY;
sahilmgandhi 18:6a4db94011d3 264 }
sahilmgandhi 18:6a4db94011d3 265
sahilmgandhi 18:6a4db94011d3 266 status = i2c_do_write(obj, (address & 0xFE), 1);
sahilmgandhi 18:6a4db94011d3 267 if (status != 0x18) {
sahilmgandhi 18:6a4db94011d3 268 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 269 return I2C_ERROR_NO_SLAVE;
sahilmgandhi 18:6a4db94011d3 270 }
sahilmgandhi 18:6a4db94011d3 271
sahilmgandhi 18:6a4db94011d3 272 for (i=0; i<length; i++) {
sahilmgandhi 18:6a4db94011d3 273 status = i2c_do_write(obj, data[i], 0);
sahilmgandhi 18:6a4db94011d3 274 if(status != 0x28) {
sahilmgandhi 18:6a4db94011d3 275 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 276 return i;
sahilmgandhi 18:6a4db94011d3 277 }
sahilmgandhi 18:6a4db94011d3 278 }
sahilmgandhi 18:6a4db94011d3 279
sahilmgandhi 18:6a4db94011d3 280 // clearing the serial interrupt here might cause an unintended rewrite of the last byte
sahilmgandhi 18:6a4db94011d3 281 // see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1
sahilmgandhi 18:6a4db94011d3 282 // i2c_clear_SI(obj);
sahilmgandhi 18:6a4db94011d3 283
sahilmgandhi 18:6a4db94011d3 284 // If not repeated start, send stop.
sahilmgandhi 18:6a4db94011d3 285 if (stop) {
sahilmgandhi 18:6a4db94011d3 286 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 287 }
sahilmgandhi 18:6a4db94011d3 288
sahilmgandhi 18:6a4db94011d3 289 return length;
sahilmgandhi 18:6a4db94011d3 290 }
sahilmgandhi 18:6a4db94011d3 291
sahilmgandhi 18:6a4db94011d3 292 void i2c_reset(i2c_t *obj) {
sahilmgandhi 18:6a4db94011d3 293 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 294 }
sahilmgandhi 18:6a4db94011d3 295
sahilmgandhi 18:6a4db94011d3 296 int i2c_byte_read(i2c_t *obj, int last) {
sahilmgandhi 18:6a4db94011d3 297 return (i2c_do_read(obj, last) & 0xFF);
sahilmgandhi 18:6a4db94011d3 298 }
sahilmgandhi 18:6a4db94011d3 299
sahilmgandhi 18:6a4db94011d3 300 int i2c_byte_write(i2c_t *obj, int data) {
sahilmgandhi 18:6a4db94011d3 301 int ack;
sahilmgandhi 18:6a4db94011d3 302 int status = i2c_do_write(obj, (data & 0xFF), 0);
sahilmgandhi 18:6a4db94011d3 303
sahilmgandhi 18:6a4db94011d3 304 switch(status) {
sahilmgandhi 18:6a4db94011d3 305 case 0x18: case 0x28: // Master transmit ACKs
sahilmgandhi 18:6a4db94011d3 306 ack = 1;
sahilmgandhi 18:6a4db94011d3 307 break;
sahilmgandhi 18:6a4db94011d3 308 case 0x40: // Master receive address transmitted ACK
sahilmgandhi 18:6a4db94011d3 309 ack = 1;
sahilmgandhi 18:6a4db94011d3 310 break;
sahilmgandhi 18:6a4db94011d3 311 case 0xB8: // Slave transmit ACK
sahilmgandhi 18:6a4db94011d3 312 ack = 1;
sahilmgandhi 18:6a4db94011d3 313 break;
sahilmgandhi 18:6a4db94011d3 314 default:
sahilmgandhi 18:6a4db94011d3 315 ack = 0;
sahilmgandhi 18:6a4db94011d3 316 break;
sahilmgandhi 18:6a4db94011d3 317 }
sahilmgandhi 18:6a4db94011d3 318
sahilmgandhi 18:6a4db94011d3 319 return ack;
sahilmgandhi 18:6a4db94011d3 320 }
sahilmgandhi 18:6a4db94011d3 321
sahilmgandhi 18:6a4db94011d3 322 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
sahilmgandhi 18:6a4db94011d3 323 if (enable_slave != 0) {
sahilmgandhi 18:6a4db94011d3 324 i2c_conclr(obj, 1, 1, 1, 0);
sahilmgandhi 18:6a4db94011d3 325 i2c_conset(obj, 0, 0, 0, 1);
sahilmgandhi 18:6a4db94011d3 326 } else {
sahilmgandhi 18:6a4db94011d3 327 i2c_conclr(obj, 1, 1, 1, 1);
sahilmgandhi 18:6a4db94011d3 328 }
sahilmgandhi 18:6a4db94011d3 329 }
sahilmgandhi 18:6a4db94011d3 330
sahilmgandhi 18:6a4db94011d3 331 int i2c_slave_receive(i2c_t *obj) {
sahilmgandhi 18:6a4db94011d3 332 int status;
sahilmgandhi 18:6a4db94011d3 333 int retval;
sahilmgandhi 18:6a4db94011d3 334
sahilmgandhi 18:6a4db94011d3 335 status = i2c_status(obj);
sahilmgandhi 18:6a4db94011d3 336 switch(status) {
sahilmgandhi 18:6a4db94011d3 337 case 0x60: retval = 3; break;
sahilmgandhi 18:6a4db94011d3 338 case 0x70: retval = 2; break;
sahilmgandhi 18:6a4db94011d3 339 case 0xA8: retval = 1; break;
sahilmgandhi 18:6a4db94011d3 340 default : retval = 0; break;
sahilmgandhi 18:6a4db94011d3 341 }
sahilmgandhi 18:6a4db94011d3 342
sahilmgandhi 18:6a4db94011d3 343 return(retval);
sahilmgandhi 18:6a4db94011d3 344 }
sahilmgandhi 18:6a4db94011d3 345
sahilmgandhi 18:6a4db94011d3 346 int i2c_slave_read(i2c_t *obj, char *data, int length) {
sahilmgandhi 18:6a4db94011d3 347 int count = 0;
sahilmgandhi 18:6a4db94011d3 348 int status;
sahilmgandhi 18:6a4db94011d3 349
sahilmgandhi 18:6a4db94011d3 350 do {
sahilmgandhi 18:6a4db94011d3 351 i2c_clear_SI(obj);
sahilmgandhi 18:6a4db94011d3 352 i2c_wait_SI(obj);
sahilmgandhi 18:6a4db94011d3 353 status = i2c_status(obj);
sahilmgandhi 18:6a4db94011d3 354 if((status == 0x80) || (status == 0x90)) {
sahilmgandhi 18:6a4db94011d3 355 data[count] = I2C_DAT(obj) & 0xFF;
sahilmgandhi 18:6a4db94011d3 356 }
sahilmgandhi 18:6a4db94011d3 357 count++;
sahilmgandhi 18:6a4db94011d3 358 } while (((status == 0x80) || (status == 0x90) ||
sahilmgandhi 18:6a4db94011d3 359 (status == 0x060) || (status == 0x70)) && (count < length));
sahilmgandhi 18:6a4db94011d3 360
sahilmgandhi 18:6a4db94011d3 361 if(status != 0xA0) {
sahilmgandhi 18:6a4db94011d3 362 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 363 }
sahilmgandhi 18:6a4db94011d3 364
sahilmgandhi 18:6a4db94011d3 365 i2c_clear_SI(obj);
sahilmgandhi 18:6a4db94011d3 366
sahilmgandhi 18:6a4db94011d3 367 return count;
sahilmgandhi 18:6a4db94011d3 368 }
sahilmgandhi 18:6a4db94011d3 369
sahilmgandhi 18:6a4db94011d3 370 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
sahilmgandhi 18:6a4db94011d3 371 int count = 0;
sahilmgandhi 18:6a4db94011d3 372 int status;
sahilmgandhi 18:6a4db94011d3 373
sahilmgandhi 18:6a4db94011d3 374 if(length <= 0) {
sahilmgandhi 18:6a4db94011d3 375 return(0);
sahilmgandhi 18:6a4db94011d3 376 }
sahilmgandhi 18:6a4db94011d3 377
sahilmgandhi 18:6a4db94011d3 378 do {
sahilmgandhi 18:6a4db94011d3 379 status = i2c_do_write(obj, data[count], 0);
sahilmgandhi 18:6a4db94011d3 380 count++;
sahilmgandhi 18:6a4db94011d3 381 } while ((count < length) && (status == 0xB8));
sahilmgandhi 18:6a4db94011d3 382
sahilmgandhi 18:6a4db94011d3 383 if ((status != 0xC0) && (status != 0xC8)) {
sahilmgandhi 18:6a4db94011d3 384 i2c_stop(obj);
sahilmgandhi 18:6a4db94011d3 385 }
sahilmgandhi 18:6a4db94011d3 386
sahilmgandhi 18:6a4db94011d3 387 i2c_clear_SI(obj);
sahilmgandhi 18:6a4db94011d3 388
sahilmgandhi 18:6a4db94011d3 389 return(count);
sahilmgandhi 18:6a4db94011d3 390 }
sahilmgandhi 18:6a4db94011d3 391
sahilmgandhi 18:6a4db94011d3 392 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
sahilmgandhi 18:6a4db94011d3 393 uint32_t addr;
sahilmgandhi 18:6a4db94011d3 394
sahilmgandhi 18:6a4db94011d3 395 if ((idx >= 0) && (idx <= 3)) {
sahilmgandhi 18:6a4db94011d3 396 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx];
sahilmgandhi 18:6a4db94011d3 397 *((uint32_t *) addr) = address & 0xFF;
sahilmgandhi 18:6a4db94011d3 398 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[1][idx];
sahilmgandhi 18:6a4db94011d3 399 *((uint32_t *) addr) = mask & 0xFE;
sahilmgandhi 18:6a4db94011d3 400 }
sahilmgandhi 18:6a4db94011d3 401 }