Marco Mayer / Mbed OS Queue

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mbed-os/targets/TARGET_NXP/TARGET_LPC13XX/i2c_api.c@0:6bf0743ece18, 2020-03-28 (annotated)

Committer:
demayer
Date:
Sat Mar 28 15:28:19 2020 +0000
Revision:
0:6bf0743ece18
IMU Thread with an event-queue running parallel to handle tasks like a 5 times blinking LED. Button with interrupt detected.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
demayer 0:6bf0743ece18 1 /* mbed Microcontroller Library
demayer 0:6bf0743ece18 2 * Copyright (c) 2006-2013 ARM Limited
demayer 0:6bf0743ece18 3 *
demayer 0:6bf0743ece18 4 * Licensed under the Apache License, Version 2.0 (the "License");
demayer 0:6bf0743ece18 5 * you may not use this file except in compliance with the License.
demayer 0:6bf0743ece18 6 * You may obtain a copy of the License at
demayer 0:6bf0743ece18 7 *
demayer 0:6bf0743ece18 8 * http://www.apache.org/licenses/LICENSE-2.0
demayer 0:6bf0743ece18 9 *
demayer 0:6bf0743ece18 10 * Unless required by applicable law or agreed to in writing, software
demayer 0:6bf0743ece18 11 * distributed under the License is distributed on an "AS IS" BASIS,
demayer 0:6bf0743ece18 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
demayer 0:6bf0743ece18 13 * See the License for the specific language governing permissions and
demayer 0:6bf0743ece18 14 * limitations under the License.
demayer 0:6bf0743ece18 15 */
demayer 0:6bf0743ece18 16 #include "mbed_assert.h"
demayer 0:6bf0743ece18 17 #include "i2c_api.h"
demayer 0:6bf0743ece18 18 #include "cmsis.h"
demayer 0:6bf0743ece18 19 #include "pinmap.h"
demayer 0:6bf0743ece18 20 #include "mbed_error.h"
demayer 0:6bf0743ece18 21
demayer 0:6bf0743ece18 22 static const PinMap PinMap_I2C_SDA[] = {
demayer 0:6bf0743ece18 23 {P0_5, I2C_0, 1},
demayer 0:6bf0743ece18 24 {NC , NC , 0}
demayer 0:6bf0743ece18 25 };
demayer 0:6bf0743ece18 26
demayer 0:6bf0743ece18 27 static const PinMap PinMap_I2C_SCL[] = {
demayer 0:6bf0743ece18 28 {P0_4, I2C_0, 1},
demayer 0:6bf0743ece18 29 {NC , NC, 0}
demayer 0:6bf0743ece18 30 };
demayer 0:6bf0743ece18 31
demayer 0:6bf0743ece18 32 #define I2C_CONSET(x) (x->i2c->CONSET)
demayer 0:6bf0743ece18 33 #define I2C_CONCLR(x) (x->i2c->CONCLR)
demayer 0:6bf0743ece18 34 #define I2C_STAT(x) (x->i2c->STAT)
demayer 0:6bf0743ece18 35 #define I2C_DAT(x) (x->i2c->DAT)
demayer 0:6bf0743ece18 36 #define I2C_SCLL(x, val) (x->i2c->SCLL = val)
demayer 0:6bf0743ece18 37 #define I2C_SCLH(x, val) (x->i2c->SCLH = val)
demayer 0:6bf0743ece18 38
demayer 0:6bf0743ece18 39 static const uint32_t I2C_addr_offset[2][4] = {
demayer 0:6bf0743ece18 40 {0x0C, 0x20, 0x24, 0x28},
demayer 0:6bf0743ece18 41 {0x30, 0x34, 0x38, 0x3C}
demayer 0:6bf0743ece18 42 };
demayer 0:6bf0743ece18 43
demayer 0:6bf0743ece18 44 static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
demayer 0:6bf0743ece18 45 I2C_CONCLR(obj) = (start << 5)
demayer 0:6bf0743ece18 46 | (stop << 4)
demayer 0:6bf0743ece18 47 | (interrupt << 3)
demayer 0:6bf0743ece18 48 | (acknowledge << 2);
demayer 0:6bf0743ece18 49 }
demayer 0:6bf0743ece18 50
demayer 0:6bf0743ece18 51 static inline void i2c_conset(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
demayer 0:6bf0743ece18 52 I2C_CONSET(obj) = (start << 5)
demayer 0:6bf0743ece18 53 | (stop << 4)
demayer 0:6bf0743ece18 54 | (interrupt << 3)
demayer 0:6bf0743ece18 55 | (acknowledge << 2);
demayer 0:6bf0743ece18 56 }
demayer 0:6bf0743ece18 57
demayer 0:6bf0743ece18 58 // Clear the Serial Interrupt (SI)
demayer 0:6bf0743ece18 59 static inline void i2c_clear_SI(i2c_t *obj) {
demayer 0:6bf0743ece18 60 i2c_conclr(obj, 0, 0, 1, 0);
demayer 0:6bf0743ece18 61 }
demayer 0:6bf0743ece18 62
demayer 0:6bf0743ece18 63 static inline int i2c_status(i2c_t *obj) {
demayer 0:6bf0743ece18 64 return I2C_STAT(obj);
demayer 0:6bf0743ece18 65 }
demayer 0:6bf0743ece18 66
demayer 0:6bf0743ece18 67 // Wait until the Serial Interrupt (SI) is set
demayer 0:6bf0743ece18 68 static int i2c_wait_SI(i2c_t *obj) {
demayer 0:6bf0743ece18 69 int timeout = 0;
demayer 0:6bf0743ece18 70 while (!(I2C_CONSET(obj) & (1 << 3))) {
demayer 0:6bf0743ece18 71 timeout++;
demayer 0:6bf0743ece18 72 if (timeout > 100000) return -1;
demayer 0:6bf0743ece18 73 }
demayer 0:6bf0743ece18 74 return 0;
demayer 0:6bf0743ece18 75 }
demayer 0:6bf0743ece18 76
demayer 0:6bf0743ece18 77 static inline void i2c_interface_enable(i2c_t *obj) {
demayer 0:6bf0743ece18 78 I2C_CONSET(obj) = 0x40;
demayer 0:6bf0743ece18 79 }
demayer 0:6bf0743ece18 80
demayer 0:6bf0743ece18 81 static inline void i2c_power_enable(i2c_t *obj) {
demayer 0:6bf0743ece18 82 LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 5);
demayer 0:6bf0743ece18 83 LPC_SYSCON->PRESETCTRL |= 1 << 1;
demayer 0:6bf0743ece18 84 }
demayer 0:6bf0743ece18 85
demayer 0:6bf0743ece18 86 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
demayer 0:6bf0743ece18 87 // determine the SPI to use
demayer 0:6bf0743ece18 88 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
demayer 0:6bf0743ece18 89 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
demayer 0:6bf0743ece18 90 obj->i2c = (LPC_I2C_Type *)pinmap_merge(i2c_sda, i2c_scl);
demayer 0:6bf0743ece18 91 MBED_ASSERT((int)obj->i2c != NC);
demayer 0:6bf0743ece18 92
demayer 0:6bf0743ece18 93 // enable power
demayer 0:6bf0743ece18 94 i2c_power_enable(obj);
demayer 0:6bf0743ece18 95
demayer 0:6bf0743ece18 96 // set default frequency at 100k
demayer 0:6bf0743ece18 97 i2c_frequency(obj, 100000);
demayer 0:6bf0743ece18 98 i2c_conclr(obj, 1, 1, 1, 1);
demayer 0:6bf0743ece18 99 i2c_interface_enable(obj);
demayer 0:6bf0743ece18 100
demayer 0:6bf0743ece18 101 pinmap_pinout(sda, PinMap_I2C_SDA);
demayer 0:6bf0743ece18 102 pinmap_pinout(scl, PinMap_I2C_SCL);
demayer 0:6bf0743ece18 103 }
demayer 0:6bf0743ece18 104
demayer 0:6bf0743ece18 105 inline int i2c_start(i2c_t *obj) {
demayer 0:6bf0743ece18 106 int status = 0;
demayer 0:6bf0743ece18 107 int isInterrupted = I2C_CONSET(obj) & (1 << 3);
demayer 0:6bf0743ece18 108
demayer 0:6bf0743ece18 109 // 8.1 Before master mode can be entered, I2CON must be initialised to:
demayer 0:6bf0743ece18 110 // - I2EN STA STO SI AA - -
demayer 0:6bf0743ece18 111 // - 1 0 0 x x - -
demayer 0:6bf0743ece18 112 // if AA = 0, it can't enter slave mode
demayer 0:6bf0743ece18 113 i2c_conclr(obj, 1, 1, 0, 1);
demayer 0:6bf0743ece18 114
demayer 0:6bf0743ece18 115 // The master mode may now be entered by setting the STA bit
demayer 0:6bf0743ece18 116 // this will generate a start condition when the bus becomes free
demayer 0:6bf0743ece18 117 i2c_conset(obj, 1, 0, 0, 1);
demayer 0:6bf0743ece18 118 // Clearing SI bit when it wasn't set on entry can jump past state
demayer 0:6bf0743ece18 119 // 0x10 or 0x08 and erroneously send uninitialized slave address.
demayer 0:6bf0743ece18 120 if (isInterrupted)
demayer 0:6bf0743ece18 121 i2c_clear_SI(obj);
demayer 0:6bf0743ece18 122
demayer 0:6bf0743ece18 123 i2c_wait_SI(obj);
demayer 0:6bf0743ece18 124 status = i2c_status(obj);
demayer 0:6bf0743ece18 125
demayer 0:6bf0743ece18 126 // Clear start bit now that it's transmitted
demayer 0:6bf0743ece18 127 i2c_conclr(obj, 1, 0, 0, 0);
demayer 0:6bf0743ece18 128 return status;
demayer 0:6bf0743ece18 129 }
demayer 0:6bf0743ece18 130
demayer 0:6bf0743ece18 131 inline int i2c_stop(i2c_t *obj) {
demayer 0:6bf0743ece18 132 int timeout = 0;
demayer 0:6bf0743ece18 133
demayer 0:6bf0743ece18 134 // write the stop bit
demayer 0:6bf0743ece18 135 i2c_conset(obj, 0, 1, 0, 0);
demayer 0:6bf0743ece18 136 i2c_clear_SI(obj);
demayer 0:6bf0743ece18 137
demayer 0:6bf0743ece18 138 // wait for STO bit to reset
demayer 0:6bf0743ece18 139 while(I2C_CONSET(obj) & (1 << 4)) {
demayer 0:6bf0743ece18 140 timeout ++;
demayer 0:6bf0743ece18 141 if (timeout > 100000) return 1;
demayer 0:6bf0743ece18 142 }
demayer 0:6bf0743ece18 143
demayer 0:6bf0743ece18 144 return 0;
demayer 0:6bf0743ece18 145 }
demayer 0:6bf0743ece18 146
demayer 0:6bf0743ece18 147
demayer 0:6bf0743ece18 148 static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) {
demayer 0:6bf0743ece18 149 // write the data
demayer 0:6bf0743ece18 150 I2C_DAT(obj) = value;
demayer 0:6bf0743ece18 151
demayer 0:6bf0743ece18 152 // clear SI to init a send
demayer 0:6bf0743ece18 153 i2c_clear_SI(obj);
demayer 0:6bf0743ece18 154
demayer 0:6bf0743ece18 155 // wait and return status
demayer 0:6bf0743ece18 156 i2c_wait_SI(obj);
demayer 0:6bf0743ece18 157 return i2c_status(obj);
demayer 0:6bf0743ece18 158 }
demayer 0:6bf0743ece18 159
demayer 0:6bf0743ece18 160 static inline int i2c_do_read(i2c_t *obj, int last) {
demayer 0:6bf0743ece18 161 // we are in state 0x40 (SLA+R tx'd) or 0x50 (data rx'd and ack)
demayer 0:6bf0743ece18 162 if (last) {
demayer 0:6bf0743ece18 163 i2c_conclr(obj, 0, 0, 0, 1); // send a NOT ACK
demayer 0:6bf0743ece18 164 } else {
demayer 0:6bf0743ece18 165 i2c_conset(obj, 0, 0, 0, 1); // send a ACK
demayer 0:6bf0743ece18 166 }
demayer 0:6bf0743ece18 167
demayer 0:6bf0743ece18 168 // accept byte
demayer 0:6bf0743ece18 169 i2c_clear_SI(obj);
demayer 0:6bf0743ece18 170
demayer 0:6bf0743ece18 171 // wait for it to arrive
demayer 0:6bf0743ece18 172 i2c_wait_SI(obj);
demayer 0:6bf0743ece18 173
demayer 0:6bf0743ece18 174 // return the data
demayer 0:6bf0743ece18 175 return (I2C_DAT(obj) & 0xFF);
demayer 0:6bf0743ece18 176 }
demayer 0:6bf0743ece18 177
demayer 0:6bf0743ece18 178 void i2c_frequency(i2c_t *obj, int hz) {
demayer 0:6bf0743ece18 179 // No peripheral clock divider on the M0
demayer 0:6bf0743ece18 180 uint32_t PCLK = SystemCoreClock;
demayer 0:6bf0743ece18 181
demayer 0:6bf0743ece18 182 uint32_t pulse = PCLK / (hz * 2);
demayer 0:6bf0743ece18 183
demayer 0:6bf0743ece18 184 // I2C Rate
demayer 0:6bf0743ece18 185 I2C_SCLL(obj, pulse);
demayer 0:6bf0743ece18 186 I2C_SCLH(obj, pulse);
demayer 0:6bf0743ece18 187 }
demayer 0:6bf0743ece18 188
demayer 0:6bf0743ece18 189 // The I2C does a read or a write as a whole operation
demayer 0:6bf0743ece18 190 // There are two types of error conditions it can encounter
demayer 0:6bf0743ece18 191 // 1) it can not obtain the bus
demayer 0:6bf0743ece18 192 // 2) it gets error responses at part of the transmission
demayer 0:6bf0743ece18 193 //
demayer 0:6bf0743ece18 194 // We tackle them as follows:
demayer 0:6bf0743ece18 195 // 1) we retry until we get the bus. we could have a "timeout" if we can not get it
demayer 0:6bf0743ece18 196 // which basically turns it in to a 2)
demayer 0:6bf0743ece18 197 // 2) on error, we use the standard error mechanisms to report/debug
demayer 0:6bf0743ece18 198 //
demayer 0:6bf0743ece18 199 // Therefore an I2C transaction should always complete. If it doesn't it is usually
demayer 0:6bf0743ece18 200 // because something is setup wrong (e.g. wiring), and we don't need to programatically
demayer 0:6bf0743ece18 201 // check for that
demayer 0:6bf0743ece18 202
demayer 0:6bf0743ece18 203 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
demayer 0:6bf0743ece18 204 int count, status;
demayer 0:6bf0743ece18 205
demayer 0:6bf0743ece18 206 status = i2c_start(obj);
demayer 0:6bf0743ece18 207
demayer 0:6bf0743ece18 208 if ((status != 0x10) && (status != 0x08)) {
demayer 0:6bf0743ece18 209 i2c_stop(obj);
demayer 0:6bf0743ece18 210 return I2C_ERROR_BUS_BUSY;
demayer 0:6bf0743ece18 211 }
demayer 0:6bf0743ece18 212
demayer 0:6bf0743ece18 213 status = i2c_do_write(obj, (address | 0x01), 1);
demayer 0:6bf0743ece18 214 if (status != 0x40) {
demayer 0:6bf0743ece18 215 i2c_stop(obj);
demayer 0:6bf0743ece18 216 return I2C_ERROR_NO_SLAVE;
demayer 0:6bf0743ece18 217 }
demayer 0:6bf0743ece18 218
demayer 0:6bf0743ece18 219 // Read in all except last byte
demayer 0:6bf0743ece18 220 for (count = 0; count < (length - 1); count++) {
demayer 0:6bf0743ece18 221 int value = i2c_do_read(obj, 0);
demayer 0:6bf0743ece18 222 status = i2c_status(obj);
demayer 0:6bf0743ece18 223 if (status != 0x50) {
demayer 0:6bf0743ece18 224 i2c_stop(obj);
demayer 0:6bf0743ece18 225 return count;
demayer 0:6bf0743ece18 226 }
demayer 0:6bf0743ece18 227 data[count] = (char) value;
demayer 0:6bf0743ece18 228 }
demayer 0:6bf0743ece18 229
demayer 0:6bf0743ece18 230 // read in last byte
demayer 0:6bf0743ece18 231 int value = i2c_do_read(obj, 1);
demayer 0:6bf0743ece18 232 status = i2c_status(obj);
demayer 0:6bf0743ece18 233 if (status != 0x58) {
demayer 0:6bf0743ece18 234 i2c_stop(obj);
demayer 0:6bf0743ece18 235 return length - 1;
demayer 0:6bf0743ece18 236 }
demayer 0:6bf0743ece18 237
demayer 0:6bf0743ece18 238 data[count] = (char) value;
demayer 0:6bf0743ece18 239
demayer 0:6bf0743ece18 240 // If not repeated start, send stop.
demayer 0:6bf0743ece18 241 if (stop) {
demayer 0:6bf0743ece18 242 i2c_stop(obj);
demayer 0:6bf0743ece18 243 }
demayer 0:6bf0743ece18 244
demayer 0:6bf0743ece18 245 return length;
demayer 0:6bf0743ece18 246 }
demayer 0:6bf0743ece18 247
demayer 0:6bf0743ece18 248 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
demayer 0:6bf0743ece18 249 int i, status;
demayer 0:6bf0743ece18 250
demayer 0:6bf0743ece18 251 status = i2c_start(obj);
demayer 0:6bf0743ece18 252
demayer 0:6bf0743ece18 253 if ((status != 0x10) && (status != 0x08)) {
demayer 0:6bf0743ece18 254 i2c_stop(obj);
demayer 0:6bf0743ece18 255 return I2C_ERROR_BUS_BUSY;
demayer 0:6bf0743ece18 256 }
demayer 0:6bf0743ece18 257
demayer 0:6bf0743ece18 258 status = i2c_do_write(obj, (address & 0xFE), 1);
demayer 0:6bf0743ece18 259 if (status != 0x18) {
demayer 0:6bf0743ece18 260 i2c_stop(obj);
demayer 0:6bf0743ece18 261 return I2C_ERROR_NO_SLAVE;
demayer 0:6bf0743ece18 262 }
demayer 0:6bf0743ece18 263
demayer 0:6bf0743ece18 264 for (i=0; i<length; i++) {
demayer 0:6bf0743ece18 265 status = i2c_do_write(obj, data[i], 0);
demayer 0:6bf0743ece18 266 if(status != 0x28) {
demayer 0:6bf0743ece18 267 i2c_stop(obj);
demayer 0:6bf0743ece18 268 return i;
demayer 0:6bf0743ece18 269 }
demayer 0:6bf0743ece18 270 }
demayer 0:6bf0743ece18 271
demayer 0:6bf0743ece18 272 // clearing the serial interrupt here might cause an unintended rewrite of the last byte
demayer 0:6bf0743ece18 273 // see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1
demayer 0:6bf0743ece18 274 // i2c_clear_SI(obj);
demayer 0:6bf0743ece18 275
demayer 0:6bf0743ece18 276 // If not repeated start, send stop.
demayer 0:6bf0743ece18 277 if (stop) {
demayer 0:6bf0743ece18 278 i2c_stop(obj);
demayer 0:6bf0743ece18 279 }
demayer 0:6bf0743ece18 280
demayer 0:6bf0743ece18 281 return length;
demayer 0:6bf0743ece18 282 }
demayer 0:6bf0743ece18 283
demayer 0:6bf0743ece18 284 void i2c_reset(i2c_t *obj) {
demayer 0:6bf0743ece18 285 i2c_stop(obj);
demayer 0:6bf0743ece18 286 }
demayer 0:6bf0743ece18 287
demayer 0:6bf0743ece18 288 int i2c_byte_read(i2c_t *obj, int last) {
demayer 0:6bf0743ece18 289 return (i2c_do_read(obj, last) & 0xFF);
demayer 0:6bf0743ece18 290 }
demayer 0:6bf0743ece18 291
demayer 0:6bf0743ece18 292 int i2c_byte_write(i2c_t *obj, int data) {
demayer 0:6bf0743ece18 293 int ack;
demayer 0:6bf0743ece18 294 int status = i2c_do_write(obj, (data & 0xFF), 0);
demayer 0:6bf0743ece18 295
demayer 0:6bf0743ece18 296 switch(status) {
demayer 0:6bf0743ece18 297 case 0x18: case 0x28: // Master transmit ACKs
demayer 0:6bf0743ece18 298 ack = 1;
demayer 0:6bf0743ece18 299 break;
demayer 0:6bf0743ece18 300 case 0x40: // Master receive address transmitted ACK
demayer 0:6bf0743ece18 301 ack = 1;
demayer 0:6bf0743ece18 302 break;
demayer 0:6bf0743ece18 303 case 0xB8: // Slave transmit ACK
demayer 0:6bf0743ece18 304 ack = 1;
demayer 0:6bf0743ece18 305 break;
demayer 0:6bf0743ece18 306 default:
demayer 0:6bf0743ece18 307 ack = 0;
demayer 0:6bf0743ece18 308 break;
demayer 0:6bf0743ece18 309 }
demayer 0:6bf0743ece18 310
demayer 0:6bf0743ece18 311 return ack;
demayer 0:6bf0743ece18 312 }
demayer 0:6bf0743ece18 313
demayer 0:6bf0743ece18 314 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
demayer 0:6bf0743ece18 315 if (enable_slave != 0) {
demayer 0:6bf0743ece18 316 i2c_conclr(obj, 1, 1, 1, 0);
demayer 0:6bf0743ece18 317 i2c_conset(obj, 0, 0, 0, 1);
demayer 0:6bf0743ece18 318 } else {
demayer 0:6bf0743ece18 319 i2c_conclr(obj, 1, 1, 1, 1);
demayer 0:6bf0743ece18 320 }
demayer 0:6bf0743ece18 321 }
demayer 0:6bf0743ece18 322
demayer 0:6bf0743ece18 323 int i2c_slave_receive(i2c_t *obj) {
demayer 0:6bf0743ece18 324 int status;
demayer 0:6bf0743ece18 325 int retval;
demayer 0:6bf0743ece18 326
demayer 0:6bf0743ece18 327 status = i2c_status(obj);
demayer 0:6bf0743ece18 328 switch(status) {
demayer 0:6bf0743ece18 329 case 0x60: retval = 3; break;
demayer 0:6bf0743ece18 330 case 0x70: retval = 2; break;
demayer 0:6bf0743ece18 331 case 0xA8: retval = 1; break;
demayer 0:6bf0743ece18 332 default : retval = 0; break;
demayer 0:6bf0743ece18 333 }
demayer 0:6bf0743ece18 334
demayer 0:6bf0743ece18 335 return(retval);
demayer 0:6bf0743ece18 336 }
demayer 0:6bf0743ece18 337
demayer 0:6bf0743ece18 338 int i2c_slave_read(i2c_t *obj, char *data, int length) {
demayer 0:6bf0743ece18 339 int count = 0;
demayer 0:6bf0743ece18 340 int status;
demayer 0:6bf0743ece18 341
demayer 0:6bf0743ece18 342 do {
demayer 0:6bf0743ece18 343 i2c_clear_SI(obj);
demayer 0:6bf0743ece18 344 i2c_wait_SI(obj);
demayer 0:6bf0743ece18 345 status = i2c_status(obj);
demayer 0:6bf0743ece18 346 if((status == 0x80) || (status == 0x90)) {
demayer 0:6bf0743ece18 347 data[count] = I2C_DAT(obj) & 0xFF;
demayer 0:6bf0743ece18 348 }
demayer 0:6bf0743ece18 349 count++;
demayer 0:6bf0743ece18 350 } while (((status == 0x80) || (status == 0x90) ||
demayer 0:6bf0743ece18 351 (status == 0x060) || (status == 0x70)) && (count < length));
demayer 0:6bf0743ece18 352
demayer 0:6bf0743ece18 353 if(status != 0xA0) {
demayer 0:6bf0743ece18 354 i2c_stop(obj);
demayer 0:6bf0743ece18 355 }
demayer 0:6bf0743ece18 356
demayer 0:6bf0743ece18 357 i2c_clear_SI(obj);
demayer 0:6bf0743ece18 358
demayer 0:6bf0743ece18 359 return count;
demayer 0:6bf0743ece18 360 }
demayer 0:6bf0743ece18 361
demayer 0:6bf0743ece18 362 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
demayer 0:6bf0743ece18 363 int count = 0;
demayer 0:6bf0743ece18 364 int status;
demayer 0:6bf0743ece18 365
demayer 0:6bf0743ece18 366 if(length <= 0) {
demayer 0:6bf0743ece18 367 return(0);
demayer 0:6bf0743ece18 368 }
demayer 0:6bf0743ece18 369
demayer 0:6bf0743ece18 370 do {
demayer 0:6bf0743ece18 371 status = i2c_do_write(obj, data[count], 0);
demayer 0:6bf0743ece18 372 count++;
demayer 0:6bf0743ece18 373 } while ((count < length) && (status == 0xB8));
demayer 0:6bf0743ece18 374
demayer 0:6bf0743ece18 375 if((status != 0xC0) && (status != 0xC8)) {
demayer 0:6bf0743ece18 376 i2c_stop(obj);
demayer 0:6bf0743ece18 377 }
demayer 0:6bf0743ece18 378
demayer 0:6bf0743ece18 379 i2c_clear_SI(obj);
demayer 0:6bf0743ece18 380
demayer 0:6bf0743ece18 381 return(count);
demayer 0:6bf0743ece18 382 }
demayer 0:6bf0743ece18 383
demayer 0:6bf0743ece18 384 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
demayer 0:6bf0743ece18 385 uint32_t addr;
demayer 0:6bf0743ece18 386
demayer 0:6bf0743ece18 387 if ((idx >= 0) && (idx <= 3)) {
demayer 0:6bf0743ece18 388 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx];
demayer 0:6bf0743ece18 389 *((uint32_t *) addr) = address & 0xFF;
demayer 0:6bf0743ece18 390 }
demayer 0:6bf0743ece18 391 }