Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_NXP/TARGET_LPC43XX/i2c_api.c@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 *
elessair 0:f269e3021894 16 * Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
elessair 0:f269e3021894 17 */
elessair 0:f269e3021894 18 #include "i2c_api.h"
elessair 0:f269e3021894 19 #include "cmsis.h"
elessair 0:f269e3021894 20 #include "pinmap.h"
elessair 0:f269e3021894 21 #include "mbed_error.h"
elessair 0:f269e3021894 22
elessair 0:f269e3021894 23 // SCU mode for I2C SCL/SDA pins
elessair 0:f269e3021894 24 #define SCU_PINIO_I2C SCU_PINIO_PULLNONE
elessair 0:f269e3021894 25
elessair 0:f269e3021894 26 static const PinMap PinMap_I2C_SDA[] = {
elessair 0:f269e3021894 27 {P_DED, I2C_0, 0},
elessair 0:f269e3021894 28 {P2_3, I2C_1, (SCU_PINIO_I2C | 1)},
elessair 0:f269e3021894 29 {PE_13, I2C_1, (SCU_PINIO_I2C | 2)},
elessair 0:f269e3021894 30 {NC, NC, 0}
elessair 0:f269e3021894 31 };
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 static const PinMap PinMap_I2C_SCL[] = {
elessair 0:f269e3021894 34 {P_DED, I2C_0, 0},
elessair 0:f269e3021894 35 {P2_4, I2C_1, (SCU_PINIO_I2C | 1)},
elessair 0:f269e3021894 36 {PE_14, I2C_1, (SCU_PINIO_I2C | 2)},
elessair 0:f269e3021894 37 {NC, NC, 0}
elessair 0:f269e3021894 38 };
elessair 0:f269e3021894 39
elessair 0:f269e3021894 40 #define I2C_CONSET(x) (x->i2c->CONSET)
elessair 0:f269e3021894 41 #define I2C_CONCLR(x) (x->i2c->CONCLR)
elessair 0:f269e3021894 42 #define I2C_STAT(x) (x->i2c->STAT)
elessair 0:f269e3021894 43 #define I2C_DAT(x) (x->i2c->DAT)
elessair 0:f269e3021894 44 #define I2C_SCLL(x, val) (x->i2c->SCLL = val)
elessair 0:f269e3021894 45 #define I2C_SCLH(x, val) (x->i2c->SCLH = val)
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 static const uint32_t I2C_addr_offset[2][4] = {
elessair 0:f269e3021894 48 {0x0C, 0x20, 0x24, 0x28},
elessair 0:f269e3021894 49 {0x30, 0x34, 0x38, 0x3C}
elessair 0:f269e3021894 50 };
elessair 0:f269e3021894 51
elessair 0:f269e3021894 52 static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
elessair 0:f269e3021894 53 I2C_CONCLR(obj) = (start << 5)
elessair 0:f269e3021894 54 | (stop << 4)
elessair 0:f269e3021894 55 | (interrupt << 3)
elessair 0:f269e3021894 56 | (acknowledge << 2);
elessair 0:f269e3021894 57 }
elessair 0:f269e3021894 58
elessair 0:f269e3021894 59 static inline void i2c_conset(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
elessair 0:f269e3021894 60 I2C_CONSET(obj) = (start << 5)
elessair 0:f269e3021894 61 | (stop << 4)
elessair 0:f269e3021894 62 | (interrupt << 3)
elessair 0:f269e3021894 63 | (acknowledge << 2);
elessair 0:f269e3021894 64 }
elessair 0:f269e3021894 65
elessair 0:f269e3021894 66 // Clear the Serial Interrupt (SI)
elessair 0:f269e3021894 67 static inline void i2c_clear_SI(i2c_t *obj) {
elessair 0:f269e3021894 68 i2c_conclr(obj, 0, 0, 1, 0);
elessair 0:f269e3021894 69 }
elessair 0:f269e3021894 70
elessair 0:f269e3021894 71 static inline int i2c_status(i2c_t *obj) {
elessair 0:f269e3021894 72 return I2C_STAT(obj);
elessair 0:f269e3021894 73 }
elessair 0:f269e3021894 74
elessair 0:f269e3021894 75 // Wait until the Serial Interrupt (SI) is set
elessair 0:f269e3021894 76 static int i2c_wait_SI(i2c_t *obj) {
elessair 0:f269e3021894 77 int timeout = 0;
elessair 0:f269e3021894 78 while (!(I2C_CONSET(obj) & (1 << 3))) {
elessair 0:f269e3021894 79 timeout++;
elessair 0:f269e3021894 80 if (timeout > 100000) return -1;
elessair 0:f269e3021894 81 }
elessair 0:f269e3021894 82 return 0;
elessair 0:f269e3021894 83 }
elessair 0:f269e3021894 84
elessair 0:f269e3021894 85 static inline void i2c_interface_enable(i2c_t *obj) {
elessair 0:f269e3021894 86 I2C_CONSET(obj) = 0x40;
elessair 0:f269e3021894 87 }
elessair 0:f269e3021894 88
elessair 0:f269e3021894 89 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
elessair 0:f269e3021894 90 // determine the SPI to use
elessair 0:f269e3021894 91 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 92 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 93 obj->i2c = (LPC_I2C_T *)pinmap_merge(i2c_sda, i2c_scl);
elessair 0:f269e3021894 94
elessair 0:f269e3021894 95 if ((int)obj->i2c == NC) {
elessair 0:f269e3021894 96 error("I2C pin mapping failed");
elessair 0:f269e3021894 97 }
elessair 0:f269e3021894 98
elessair 0:f269e3021894 99 // set default frequency at 100k
elessair 0:f269e3021894 100 i2c_frequency(obj, 100000);
elessair 0:f269e3021894 101 i2c_conclr(obj, 1, 1, 1, 1);
elessair 0:f269e3021894 102 i2c_interface_enable(obj);
elessair 0:f269e3021894 103
elessair 0:f269e3021894 104 // Set SCU functions
elessair 0:f269e3021894 105 if (scl == P_DED) {
elessair 0:f269e3021894 106 // Enable dedicated I2C0 SDA and SCL pins (open drain)
elessair 0:f269e3021894 107 LPC_SCU->SFSI2C0 = (1 << 11) | (1 << 3);
elessair 0:f269e3021894 108 } else {
elessair 0:f269e3021894 109 pinmap_pinout(sda, PinMap_I2C_SDA);
elessair 0:f269e3021894 110 pinmap_pinout(scl, PinMap_I2C_SCL);
elessair 0:f269e3021894 111 }
elessair 0:f269e3021894 112 }
elessair 0:f269e3021894 113
elessair 0:f269e3021894 114 inline int i2c_start(i2c_t *obj) {
elessair 0:f269e3021894 115 int status = 0;
elessair 0:f269e3021894 116 int isInterrupted = I2C_CONSET(obj) & (1 << 3);
elessair 0:f269e3021894 117
elessair 0:f269e3021894 118 // 8.1 Before master mode can be entered, I2CON must be initialised to:
elessair 0:f269e3021894 119 // - I2EN STA STO SI AA - -
elessair 0:f269e3021894 120 // - 1 0 0 x x - -
elessair 0:f269e3021894 121 // if AA = 0, it can't enter slave mode
elessair 0:f269e3021894 122 i2c_conclr(obj, 1, 1, 0, 1);
elessair 0:f269e3021894 123
elessair 0:f269e3021894 124 // The master mode may now be entered by setting the STA bit
elessair 0:f269e3021894 125 // this will generate a start condition when the bus becomes free
elessair 0:f269e3021894 126 i2c_conset(obj, 1, 0, 0, 1);
elessair 0:f269e3021894 127 // Clearing SI bit when it wasn't set on entry can jump past state
elessair 0:f269e3021894 128 // 0x10 or 0x08 and erroneously send uninitialized slave address.
elessair 0:f269e3021894 129 if (isInterrupted)
elessair 0:f269e3021894 130 i2c_clear_SI(obj);
elessair 0:f269e3021894 131
elessair 0:f269e3021894 132 i2c_wait_SI(obj);
elessair 0:f269e3021894 133 status = i2c_status(obj);
elessair 0:f269e3021894 134
elessair 0:f269e3021894 135 // Clear start bit now that it's transmitted
elessair 0:f269e3021894 136 i2c_conclr(obj, 1, 0, 0, 0);
elessair 0:f269e3021894 137 return status;
elessair 0:f269e3021894 138 }
elessair 0:f269e3021894 139
elessair 0:f269e3021894 140 inline int i2c_stop(i2c_t *obj) {
elessair 0:f269e3021894 141 int timeout = 0;
elessair 0:f269e3021894 142
elessair 0:f269e3021894 143 // write the stop bit
elessair 0:f269e3021894 144 i2c_conset(obj, 0, 1, 0, 0);
elessair 0:f269e3021894 145 i2c_clear_SI(obj);
elessair 0:f269e3021894 146
elessair 0:f269e3021894 147 // wait for STO bit to reset
elessair 0:f269e3021894 148 while(I2C_CONSET(obj) & (1 << 4)) {
elessair 0:f269e3021894 149 timeout ++;
elessair 0:f269e3021894 150 if (timeout > 100000) return 1;
elessair 0:f269e3021894 151 }
elessair 0:f269e3021894 152
elessair 0:f269e3021894 153 return 0;
elessair 0:f269e3021894 154 }
elessair 0:f269e3021894 155
elessair 0:f269e3021894 156 static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) {
elessair 0:f269e3021894 157 // write the data
elessair 0:f269e3021894 158 I2C_DAT(obj) = value;
elessair 0:f269e3021894 159
elessair 0:f269e3021894 160 // clear SI to init a send
elessair 0:f269e3021894 161 i2c_clear_SI(obj);
elessair 0:f269e3021894 162
elessair 0:f269e3021894 163 // wait and return status
elessair 0:f269e3021894 164 i2c_wait_SI(obj);
elessair 0:f269e3021894 165 return i2c_status(obj);
elessair 0:f269e3021894 166 }
elessair 0:f269e3021894 167
elessair 0:f269e3021894 168 static inline int i2c_do_read(i2c_t *obj, int last) {
elessair 0:f269e3021894 169 // we are in state 0x40 (SLA+R tx'd) or 0x50 (data rx'd and ack)
elessair 0:f269e3021894 170 if(last) {
elessair 0:f269e3021894 171 i2c_conclr(obj, 0, 0, 0, 1); // send a NOT ACK
elessair 0:f269e3021894 172 } else {
elessair 0:f269e3021894 173 i2c_conset(obj, 0, 0, 0, 1); // send a ACK
elessair 0:f269e3021894 174 }
elessair 0:f269e3021894 175
elessair 0:f269e3021894 176 // accept byte
elessair 0:f269e3021894 177 i2c_clear_SI(obj);
elessair 0:f269e3021894 178
elessair 0:f269e3021894 179 // wait for it to arrive
elessair 0:f269e3021894 180 i2c_wait_SI(obj);
elessair 0:f269e3021894 181
elessair 0:f269e3021894 182 // return the data
elessair 0:f269e3021894 183 return (I2C_DAT(obj) & 0xFF);
elessair 0:f269e3021894 184 }
elessair 0:f269e3021894 185
elessair 0:f269e3021894 186 void i2c_frequency(i2c_t *obj, int hz) {
elessair 0:f269e3021894 187 // [TODO] set pclk to /4
elessair 0:f269e3021894 188 uint32_t PCLK = SystemCoreClock / 4;
elessair 0:f269e3021894 189
elessair 0:f269e3021894 190 uint32_t pulse = PCLK / (hz * 2);
elessair 0:f269e3021894 191
elessair 0:f269e3021894 192 // I2C Rate
elessair 0:f269e3021894 193 I2C_SCLL(obj, pulse);
elessair 0:f269e3021894 194 I2C_SCLH(obj, pulse);
elessair 0:f269e3021894 195 }
elessair 0:f269e3021894 196
elessair 0:f269e3021894 197 // The I2C does a read or a write as a whole operation
elessair 0:f269e3021894 198 // There are two types of error conditions it can encounter
elessair 0:f269e3021894 199 // 1) it can not obtain the bus
elessair 0:f269e3021894 200 // 2) it gets error responses at part of the transmission
elessair 0:f269e3021894 201 //
elessair 0:f269e3021894 202 // We tackle them as follows:
elessair 0:f269e3021894 203 // 1) we retry until we get the bus. we could have a "timeout" if we can not get it
elessair 0:f269e3021894 204 // which basically turns it in to a 2)
elessair 0:f269e3021894 205 // 2) on error, we use the standard error mechanisms to report/debug
elessair 0:f269e3021894 206 //
elessair 0:f269e3021894 207 // Therefore an I2C transaction should always complete. If it doesn't it is usually
elessair 0:f269e3021894 208 // because something is setup wrong (e.g. wiring), and we don't need to programatically
elessair 0:f269e3021894 209 // check for that
elessair 0:f269e3021894 210
elessair 0:f269e3021894 211 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
elessair 0:f269e3021894 212 int count, status;
elessair 0:f269e3021894 213
elessair 0:f269e3021894 214 status = i2c_start(obj);
elessair 0:f269e3021894 215
elessair 0:f269e3021894 216 if ((status != 0x10) && (status != 0x08)) {
elessair 0:f269e3021894 217 i2c_stop(obj);
elessair 0:f269e3021894 218 return I2C_ERROR_BUS_BUSY;
elessair 0:f269e3021894 219 }
elessair 0:f269e3021894 220
elessair 0:f269e3021894 221 status = i2c_do_write(obj, (address | 0x01), 1);
elessair 0:f269e3021894 222 if (status != 0x40) {
elessair 0:f269e3021894 223 i2c_stop(obj);
elessair 0:f269e3021894 224 return I2C_ERROR_NO_SLAVE;
elessair 0:f269e3021894 225 }
elessair 0:f269e3021894 226
elessair 0:f269e3021894 227 // Read in all except last byte
elessair 0:f269e3021894 228 for (count = 0; count < (length - 1); count++) {
elessair 0:f269e3021894 229 int value = i2c_do_read(obj, 0);
elessair 0:f269e3021894 230 status = i2c_status(obj);
elessair 0:f269e3021894 231 if (status != 0x50) {
elessair 0:f269e3021894 232 i2c_stop(obj);
elessair 0:f269e3021894 233 return count;
elessair 0:f269e3021894 234 }
elessair 0:f269e3021894 235 data[count] = (char) value;
elessair 0:f269e3021894 236 }
elessair 0:f269e3021894 237
elessair 0:f269e3021894 238 // read in last byte
elessair 0:f269e3021894 239 int value = i2c_do_read(obj, 1);
elessair 0:f269e3021894 240 status = i2c_status(obj);
elessair 0:f269e3021894 241 if (status != 0x58) {
elessair 0:f269e3021894 242 i2c_stop(obj);
elessair 0:f269e3021894 243 return length - 1;
elessair 0:f269e3021894 244 }
elessair 0:f269e3021894 245
elessair 0:f269e3021894 246 data[count] = (char) value;
elessair 0:f269e3021894 247
elessair 0:f269e3021894 248 // If not repeated start, send stop.
elessair 0:f269e3021894 249 if (stop) {
elessair 0:f269e3021894 250 i2c_stop(obj);
elessair 0:f269e3021894 251 }
elessair 0:f269e3021894 252
elessair 0:f269e3021894 253 return length;
elessair 0:f269e3021894 254 }
elessair 0:f269e3021894 255
elessair 0:f269e3021894 256 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
elessair 0:f269e3021894 257 int i, status;
elessair 0:f269e3021894 258
elessair 0:f269e3021894 259 status = i2c_start(obj);
elessair 0:f269e3021894 260
elessair 0:f269e3021894 261 if ((status != 0x10) && (status != 0x08)) {
elessair 0:f269e3021894 262 i2c_stop(obj);
elessair 0:f269e3021894 263 return I2C_ERROR_BUS_BUSY;
elessair 0:f269e3021894 264 }
elessair 0:f269e3021894 265
elessair 0:f269e3021894 266 status = i2c_do_write(obj, (address & 0xFE), 1);
elessair 0:f269e3021894 267 if (status != 0x18) {
elessair 0:f269e3021894 268 i2c_stop(obj);
elessair 0:f269e3021894 269 return I2C_ERROR_NO_SLAVE;
elessair 0:f269e3021894 270 }
elessair 0:f269e3021894 271
elessair 0:f269e3021894 272 for (i=0; i<length; i++) {
elessair 0:f269e3021894 273 status = i2c_do_write(obj, data[i], 0);
elessair 0:f269e3021894 274 if(status != 0x28) {
elessair 0:f269e3021894 275 i2c_stop(obj);
elessair 0:f269e3021894 276 return i;
elessair 0:f269e3021894 277 }
elessair 0:f269e3021894 278 }
elessair 0:f269e3021894 279
elessair 0:f269e3021894 280 // clearing the serial interrupt here might cause an unintended rewrite of the last byte
elessair 0:f269e3021894 281 // see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1
elessair 0:f269e3021894 282 // i2c_clear_SI(obj);
elessair 0:f269e3021894 283
elessair 0:f269e3021894 284 // If not repeated start, send stop.
elessair 0:f269e3021894 285 if (stop) {
elessair 0:f269e3021894 286 i2c_stop(obj);
elessair 0:f269e3021894 287 }
elessair 0:f269e3021894 288
elessair 0:f269e3021894 289 return length;
elessair 0:f269e3021894 290 }
elessair 0:f269e3021894 291
elessair 0:f269e3021894 292 void i2c_reset(i2c_t *obj) {
elessair 0:f269e3021894 293 i2c_stop(obj);
elessair 0:f269e3021894 294 }
elessair 0:f269e3021894 295
elessair 0:f269e3021894 296 int i2c_byte_read(i2c_t *obj, int last) {
elessair 0:f269e3021894 297 return (i2c_do_read(obj, last) & 0xFF);
elessair 0:f269e3021894 298 }
elessair 0:f269e3021894 299
elessair 0:f269e3021894 300 int i2c_byte_write(i2c_t *obj, int data) {
elessair 0:f269e3021894 301 int ack;
elessair 0:f269e3021894 302 int status = i2c_do_write(obj, (data & 0xFF), 0);
elessair 0:f269e3021894 303
elessair 0:f269e3021894 304 switch(status) {
elessair 0:f269e3021894 305 case 0x18: case 0x28: // Master transmit ACKs
elessair 0:f269e3021894 306 ack = 1;
elessair 0:f269e3021894 307 break;
elessair 0:f269e3021894 308 case 0x40: // Master receive address transmitted ACK
elessair 0:f269e3021894 309 ack = 1;
elessair 0:f269e3021894 310 break;
elessair 0:f269e3021894 311 case 0xB8: // Slave transmit ACK
elessair 0:f269e3021894 312 ack = 1;
elessair 0:f269e3021894 313 break;
elessair 0:f269e3021894 314 default:
elessair 0:f269e3021894 315 ack = 0;
elessair 0:f269e3021894 316 break;
elessair 0:f269e3021894 317 }
elessair 0:f269e3021894 318
elessair 0:f269e3021894 319 return ack;
elessair 0:f269e3021894 320 }
elessair 0:f269e3021894 321
elessair 0:f269e3021894 322 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
elessair 0:f269e3021894 323 if (enable_slave != 0) {
elessair 0:f269e3021894 324 i2c_conclr(obj, 1, 1, 1, 0);
elessair 0:f269e3021894 325 i2c_conset(obj, 0, 0, 0, 1);
elessair 0:f269e3021894 326 } else {
elessair 0:f269e3021894 327 i2c_conclr(obj, 1, 1, 1, 1);
elessair 0:f269e3021894 328 }
elessair 0:f269e3021894 329 }
elessair 0:f269e3021894 330
elessair 0:f269e3021894 331 int i2c_slave_receive(i2c_t *obj) {
elessair 0:f269e3021894 332 int status;
elessair 0:f269e3021894 333 int retval;
elessair 0:f269e3021894 334
elessair 0:f269e3021894 335 status = i2c_status(obj);
elessair 0:f269e3021894 336 switch(status) {
elessair 0:f269e3021894 337 case 0x60: retval = 3; break;
elessair 0:f269e3021894 338 case 0x70: retval = 2; break;
elessair 0:f269e3021894 339 case 0xA8: retval = 1; break;
elessair 0:f269e3021894 340 default : retval = 0; break;
elessair 0:f269e3021894 341 }
elessair 0:f269e3021894 342
elessair 0:f269e3021894 343 return(retval);
elessair 0:f269e3021894 344 }
elessair 0:f269e3021894 345
elessair 0:f269e3021894 346 int i2c_slave_read(i2c_t *obj, char *data, int length) {
elessair 0:f269e3021894 347 int count = 0;
elessair 0:f269e3021894 348 int status;
elessair 0:f269e3021894 349
elessair 0:f269e3021894 350 do {
elessair 0:f269e3021894 351 i2c_clear_SI(obj);
elessair 0:f269e3021894 352 i2c_wait_SI(obj);
elessair 0:f269e3021894 353 status = i2c_status(obj);
elessair 0:f269e3021894 354 if((status == 0x80) || (status == 0x90)) {
elessair 0:f269e3021894 355 data[count] = I2C_DAT(obj) & 0xFF;
elessair 0:f269e3021894 356 }
elessair 0:f269e3021894 357 count++;
elessair 0:f269e3021894 358 } while (((status == 0x80) || (status == 0x90) ||
elessair 0:f269e3021894 359 (status == 0x060) || (status == 0x70)) && (count < length));
elessair 0:f269e3021894 360
elessair 0:f269e3021894 361 if(status != 0xA0) {
elessair 0:f269e3021894 362 i2c_stop(obj);
elessair 0:f269e3021894 363 }
elessair 0:f269e3021894 364
elessair 0:f269e3021894 365 i2c_clear_SI(obj);
elessair 0:f269e3021894 366
elessair 0:f269e3021894 367 return count;
elessair 0:f269e3021894 368 }
elessair 0:f269e3021894 369
elessair 0:f269e3021894 370 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
elessair 0:f269e3021894 371 int count = 0;
elessair 0:f269e3021894 372 int status;
elessair 0:f269e3021894 373
elessair 0:f269e3021894 374 if(length <= 0) {
elessair 0:f269e3021894 375 return(0);
elessair 0:f269e3021894 376 }
elessair 0:f269e3021894 377
elessair 0:f269e3021894 378 do {
elessair 0:f269e3021894 379 status = i2c_do_write(obj, data[count], 0);
elessair 0:f269e3021894 380 count++;
elessair 0:f269e3021894 381 } while ((count < length) && (status == 0xB8));
elessair 0:f269e3021894 382
elessair 0:f269e3021894 383 if ((status != 0xC0) && (status != 0xC8)) {
elessair 0:f269e3021894 384 i2c_stop(obj);
elessair 0:f269e3021894 385 }
elessair 0:f269e3021894 386
elessair 0:f269e3021894 387 i2c_clear_SI(obj);
elessair 0:f269e3021894 388
elessair 0:f269e3021894 389 return(count);
elessair 0:f269e3021894 390 }
elessair 0:f269e3021894 391
elessair 0:f269e3021894 392 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
elessair 0:f269e3021894 393 uint32_t addr;
elessair 0:f269e3021894 394
elessair 0:f269e3021894 395 if ((idx >= 0) && (idx <= 3)) {
elessair 0:f269e3021894 396 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx];
elessair 0:f269e3021894 397 *((uint32_t *) addr) = address & 0xFF;
elessair 0:f269e3021894 398 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[1][idx];
elessair 0:f269e3021894 399 *((uint32_t *) addr) = mask & 0xFE;
elessair 0:f269e3021894 400 }
elessair 0:f269e3021894 401 }