shinichi nakazawa / mbed-src

mbed library sources

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targets/hal/TARGET_NXP/TARGET_LPC408X/TARGET_LPC4088_DM/i2c_api.c@462:e03396e14338, 2015-02-03 (annotated)

Committer:
mbed_official
Date:
Tue Feb 03 13:15:07 2015 +0000
Revision:
462:e03396e14338
Synchronized with git revision ae7e2e76ed57b9ca11dc05f51f097df1de144fe2



Full URL: https://github.com/mbedmicro/mbed/commit/ae7e2e76ed57b9ca11dc05f51f097df1de144fe2/



Add support for EA LPC4088_DM

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 462:e03396e14338 1 /* mbed Microcontroller Library
mbed_official 462:e03396e14338 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 462:e03396e14338 3 *
mbed_official 462:e03396e14338 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 462:e03396e14338 5 * you may not use this file except in compliance with the License.
mbed_official 462:e03396e14338 6 * You may obtain a copy of the License at
mbed_official 462:e03396e14338 7 *
mbed_official 462:e03396e14338 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 462:e03396e14338 9 *
mbed_official 462:e03396e14338 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 462:e03396e14338 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 462:e03396e14338 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 462:e03396e14338 13 * See the License for the specific language governing permissions and
mbed_official 462:e03396e14338 14 * limitations under the License.
mbed_official 462:e03396e14338 15 */
mbed_official 462:e03396e14338 16 #include "mbed_assert.h"
mbed_official 462:e03396e14338 17 #include "i2c_api.h"
mbed_official 462:e03396e14338 18 #include "cmsis.h"
mbed_official 462:e03396e14338 19 #include "pinmap.h"
mbed_official 462:e03396e14338 20
mbed_official 462:e03396e14338 21 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 462:e03396e14338 22 {P0_0 , I2C_1, 3},
mbed_official 462:e03396e14338 23 {P0_27, I2C_0, 1},
mbed_official 462:e03396e14338 24 {P2_14, I2C_1, 2},
mbed_official 462:e03396e14338 25 {NC , NC , 0}
mbed_official 462:e03396e14338 26 };
mbed_official 462:e03396e14338 27
mbed_official 462:e03396e14338 28 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 462:e03396e14338 29 {P0_1 , I2C_1, 3},
mbed_official 462:e03396e14338 30 {P0_28, I2C_0, 1},
mbed_official 462:e03396e14338 31 {P2_15, I2C_1, 2},
mbed_official 462:e03396e14338 32 {NC , NC, 0}
mbed_official 462:e03396e14338 33 };
mbed_official 462:e03396e14338 34
mbed_official 462:e03396e14338 35 #define I2C_CONSET(x) (x->i2c->CONSET)
mbed_official 462:e03396e14338 36 #define I2C_CONCLR(x) (x->i2c->CONCLR)
mbed_official 462:e03396e14338 37 #define I2C_STAT(x) (x->i2c->STAT)
mbed_official 462:e03396e14338 38 #define I2C_DAT(x) (x->i2c->DAT)
mbed_official 462:e03396e14338 39 #define I2C_SCLL(x, val) (x->i2c->SCLL = val)
mbed_official 462:e03396e14338 40 #define I2C_SCLH(x, val) (x->i2c->SCLH = val)
mbed_official 462:e03396e14338 41
mbed_official 462:e03396e14338 42 static const uint32_t I2C_addr_offset[2][4] = {
mbed_official 462:e03396e14338 43 {0x0C, 0x20, 0x24, 0x28},
mbed_official 462:e03396e14338 44 {0x30, 0x34, 0x38, 0x3C}
mbed_official 462:e03396e14338 45 };
mbed_official 462:e03396e14338 46
mbed_official 462:e03396e14338 47 static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
mbed_official 462:e03396e14338 48 I2C_CONCLR(obj) = (start << 5)
mbed_official 462:e03396e14338 49 | (stop << 4)
mbed_official 462:e03396e14338 50 | (interrupt << 3)
mbed_official 462:e03396e14338 51 | (acknowledge << 2);
mbed_official 462:e03396e14338 52 }
mbed_official 462:e03396e14338 53
mbed_official 462:e03396e14338 54 static inline void i2c_conset(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
mbed_official 462:e03396e14338 55 I2C_CONSET(obj) = (start << 5)
mbed_official 462:e03396e14338 56 | (stop << 4)
mbed_official 462:e03396e14338 57 | (interrupt << 3)
mbed_official 462:e03396e14338 58 | (acknowledge << 2);
mbed_official 462:e03396e14338 59 }
mbed_official 462:e03396e14338 60
mbed_official 462:e03396e14338 61 // Clear the Serial Interrupt (SI)
mbed_official 462:e03396e14338 62 static inline void i2c_clear_SI(i2c_t *obj) {
mbed_official 462:e03396e14338 63 i2c_conclr(obj, 0, 0, 1, 0);
mbed_official 462:e03396e14338 64 }
mbed_official 462:e03396e14338 65
mbed_official 462:e03396e14338 66 static inline int i2c_status(i2c_t *obj) {
mbed_official 462:e03396e14338 67 return I2C_STAT(obj);
mbed_official 462:e03396e14338 68 }
mbed_official 462:e03396e14338 69
mbed_official 462:e03396e14338 70 // Wait until the Serial Interrupt (SI) is set
mbed_official 462:e03396e14338 71 static int i2c_wait_SI(i2c_t *obj) {
mbed_official 462:e03396e14338 72 int timeout = 0;
mbed_official 462:e03396e14338 73 while (!(I2C_CONSET(obj) & (1 << 3))) {
mbed_official 462:e03396e14338 74 timeout++;
mbed_official 462:e03396e14338 75 if (timeout > 100000) return -1;
mbed_official 462:e03396e14338 76 }
mbed_official 462:e03396e14338 77 return 0;
mbed_official 462:e03396e14338 78 }
mbed_official 462:e03396e14338 79
mbed_official 462:e03396e14338 80 static inline void i2c_interface_enable(i2c_t *obj) {
mbed_official 462:e03396e14338 81 I2C_CONSET(obj) = 0x40;
mbed_official 462:e03396e14338 82 }
mbed_official 462:e03396e14338 83
mbed_official 462:e03396e14338 84 static inline void i2c_power_enable(i2c_t *obj) {
mbed_official 462:e03396e14338 85 switch ((int)obj->i2c) {
mbed_official 462:e03396e14338 86 case I2C_0: LPC_SC->PCONP |= 1 << 7; break;
mbed_official 462:e03396e14338 87 case I2C_1: LPC_SC->PCONP |= 1 << 19; break;
mbed_official 462:e03396e14338 88 case I2C_2: LPC_SC->PCONP |= 1 << 26; break;
mbed_official 462:e03396e14338 89 }
mbed_official 462:e03396e14338 90 }
mbed_official 462:e03396e14338 91
mbed_official 462:e03396e14338 92 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 462:e03396e14338 93 // determine the SPI to use
mbed_official 462:e03396e14338 94 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 462:e03396e14338 95 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 462:e03396e14338 96 obj->i2c = (LPC_I2C_TypeDef *)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 462:e03396e14338 97 MBED_ASSERT((int)obj->i2c != NC);
mbed_official 462:e03396e14338 98
mbed_official 462:e03396e14338 99 // enable power
mbed_official 462:e03396e14338 100 i2c_power_enable(obj);
mbed_official 462:e03396e14338 101
mbed_official 462:e03396e14338 102 // set default frequency at 100k
mbed_official 462:e03396e14338 103 i2c_frequency(obj, 100000);
mbed_official 462:e03396e14338 104 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 462:e03396e14338 105 i2c_interface_enable(obj);
mbed_official 462:e03396e14338 106
mbed_official 462:e03396e14338 107 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 462:e03396e14338 108 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 462:e03396e14338 109
mbed_official 462:e03396e14338 110 // OpenDrain must explicitly be enabled for p0.0 and p0.1
mbed_official 462:e03396e14338 111 if (sda == P0_0) {
mbed_official 462:e03396e14338 112 pin_mode(sda, OpenDrain);
mbed_official 462:e03396e14338 113 }
mbed_official 462:e03396e14338 114 if (scl == P0_1) {
mbed_official 462:e03396e14338 115 pin_mode(scl, OpenDrain);
mbed_official 462:e03396e14338 116 }
mbed_official 462:e03396e14338 117
mbed_official 462:e03396e14338 118 }
mbed_official 462:e03396e14338 119
mbed_official 462:e03396e14338 120 inline int i2c_start(i2c_t *obj) {
mbed_official 462:e03396e14338 121 int status = 0;
mbed_official 462:e03396e14338 122 // 8.1 Before master mode can be entered, I2CON must be initialised to:
mbed_official 462:e03396e14338 123 // - I2EN STA STO SI AA - -
mbed_official 462:e03396e14338 124 // - 1 0 0 0 x - -
mbed_official 462:e03396e14338 125 // if AA = 0, it can't enter slave mode
mbed_official 462:e03396e14338 126 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 462:e03396e14338 127
mbed_official 462:e03396e14338 128 // The master mode may now be entered by setting the STA bit
mbed_official 462:e03396e14338 129 // this will generate a start condition when the bus becomes free
mbed_official 462:e03396e14338 130 i2c_conset(obj, 1, 0, 0, 1);
mbed_official 462:e03396e14338 131
mbed_official 462:e03396e14338 132 i2c_wait_SI(obj);
mbed_official 462:e03396e14338 133 status = i2c_status(obj);
mbed_official 462:e03396e14338 134
mbed_official 462:e03396e14338 135 // Clear start bit now transmitted, and interrupt bit
mbed_official 462:e03396e14338 136 i2c_conclr(obj, 1, 0, 0, 0);
mbed_official 462:e03396e14338 137 return status;
mbed_official 462:e03396e14338 138 }
mbed_official 462:e03396e14338 139
mbed_official 462:e03396e14338 140 inline int i2c_stop(i2c_t *obj) {
mbed_official 462:e03396e14338 141 int timeout = 0;
mbed_official 462:e03396e14338 142
mbed_official 462:e03396e14338 143 // write the stop bit
mbed_official 462:e03396e14338 144 i2c_conset(obj, 0, 1, 0, 0);
mbed_official 462:e03396e14338 145 i2c_clear_SI(obj);
mbed_official 462:e03396e14338 146
mbed_official 462:e03396e14338 147 // wait for STO bit to reset
mbed_official 462:e03396e14338 148 while(I2C_CONSET(obj) & (1 << 4)) {
mbed_official 462:e03396e14338 149 timeout ++;
mbed_official 462:e03396e14338 150 if (timeout > 100000) return 1;
mbed_official 462:e03396e14338 151 }
mbed_official 462:e03396e14338 152
mbed_official 462:e03396e14338 153 return 0;
mbed_official 462:e03396e14338 154 }
mbed_official 462:e03396e14338 155
mbed_official 462:e03396e14338 156
mbed_official 462:e03396e14338 157 static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) {
mbed_official 462:e03396e14338 158 // write the data
mbed_official 462:e03396e14338 159 I2C_DAT(obj) = value;
mbed_official 462:e03396e14338 160
mbed_official 462:e03396e14338 161 // clear SI to init a send
mbed_official 462:e03396e14338 162 i2c_clear_SI(obj);
mbed_official 462:e03396e14338 163
mbed_official 462:e03396e14338 164 // wait and return status
mbed_official 462:e03396e14338 165 i2c_wait_SI(obj);
mbed_official 462:e03396e14338 166 return i2c_status(obj);
mbed_official 462:e03396e14338 167 }
mbed_official 462:e03396e14338 168
mbed_official 462:e03396e14338 169 static inline int i2c_do_read(i2c_t *obj, int last) {
mbed_official 462:e03396e14338 170 // we are in state 0x40 (SLA+R tx'd) or 0x50 (data rx'd and ack)
mbed_official 462:e03396e14338 171 if(last) {
mbed_official 462:e03396e14338 172 i2c_conclr(obj, 0, 0, 0, 1); // send a NOT ACK
mbed_official 462:e03396e14338 173 } else {
mbed_official 462:e03396e14338 174 i2c_conset(obj, 0, 0, 0, 1); // send a ACK
mbed_official 462:e03396e14338 175 }
mbed_official 462:e03396e14338 176
mbed_official 462:e03396e14338 177 // accept byte
mbed_official 462:e03396e14338 178 i2c_clear_SI(obj);
mbed_official 462:e03396e14338 179
mbed_official 462:e03396e14338 180 // wait for it to arrive
mbed_official 462:e03396e14338 181 i2c_wait_SI(obj);
mbed_official 462:e03396e14338 182
mbed_official 462:e03396e14338 183 // return the data
mbed_official 462:e03396e14338 184 return (I2C_DAT(obj) & 0xFF);
mbed_official 462:e03396e14338 185 }
mbed_official 462:e03396e14338 186
mbed_official 462:e03396e14338 187 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 462:e03396e14338 188 uint32_t PCLK = PeripheralClock;
mbed_official 462:e03396e14338 189 uint32_t pulse = PCLK / (hz * 2);
mbed_official 462:e03396e14338 190
mbed_official 462:e03396e14338 191 // I2C Rate
mbed_official 462:e03396e14338 192 I2C_SCLL(obj, pulse);
mbed_official 462:e03396e14338 193 I2C_SCLH(obj, pulse);
mbed_official 462:e03396e14338 194 }
mbed_official 462:e03396e14338 195
mbed_official 462:e03396e14338 196 // The I2C does a read or a write as a whole operation
mbed_official 462:e03396e14338 197 // There are two types of error conditions it can encounter
mbed_official 462:e03396e14338 198 // 1) it can not obtain the bus
mbed_official 462:e03396e14338 199 // 2) it gets error responses at part of the transmission
mbed_official 462:e03396e14338 200 //
mbed_official 462:e03396e14338 201 // We tackle them as follows:
mbed_official 462:e03396e14338 202 // 1) we retry until we get the bus. we could have a "timeout" if we can not get it
mbed_official 462:e03396e14338 203 // which basically turns it in to a 2)
mbed_official 462:e03396e14338 204 // 2) on error, we use the standard error mechanisms to report/debug
mbed_official 462:e03396e14338 205 //
mbed_official 462:e03396e14338 206 // Therefore an I2C transaction should always complete. If it doesn't it is usually
mbed_official 462:e03396e14338 207 // because something is setup wrong (e.g. wiring), and we don't need to programatically
mbed_official 462:e03396e14338 208 // check for that
mbed_official 462:e03396e14338 209 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 462:e03396e14338 210 int count, status;
mbed_official 462:e03396e14338 211
mbed_official 462:e03396e14338 212 status = i2c_start(obj);
mbed_official 462:e03396e14338 213
mbed_official 462:e03396e14338 214 if ((status != 0x10) && (status != 0x08)) {
mbed_official 462:e03396e14338 215 i2c_stop(obj);
mbed_official 462:e03396e14338 216 return I2C_ERROR_BUS_BUSY;
mbed_official 462:e03396e14338 217 }
mbed_official 462:e03396e14338 218
mbed_official 462:e03396e14338 219 status = i2c_do_write(obj, (address | 0x01), 1);
mbed_official 462:e03396e14338 220 if (status != 0x40) {
mbed_official 462:e03396e14338 221 i2c_stop(obj);
mbed_official 462:e03396e14338 222 return I2C_ERROR_NO_SLAVE;
mbed_official 462:e03396e14338 223 }
mbed_official 462:e03396e14338 224
mbed_official 462:e03396e14338 225 // Read in all except last byte
mbed_official 462:e03396e14338 226 for (count = 0; count < (length - 1); count++) {
mbed_official 462:e03396e14338 227 int value = i2c_do_read(obj, 0);
mbed_official 462:e03396e14338 228 status = i2c_status(obj);
mbed_official 462:e03396e14338 229 if (status != 0x50) {
mbed_official 462:e03396e14338 230 i2c_stop(obj);
mbed_official 462:e03396e14338 231 return count;
mbed_official 462:e03396e14338 232 }
mbed_official 462:e03396e14338 233 data[count] = (char) value;
mbed_official 462:e03396e14338 234 }
mbed_official 462:e03396e14338 235
mbed_official 462:e03396e14338 236 // read in last byte
mbed_official 462:e03396e14338 237 int value = i2c_do_read(obj, 1);
mbed_official 462:e03396e14338 238 status = i2c_status(obj);
mbed_official 462:e03396e14338 239 if (status != 0x58) {
mbed_official 462:e03396e14338 240 i2c_stop(obj);
mbed_official 462:e03396e14338 241 return length - 1;
mbed_official 462:e03396e14338 242 }
mbed_official 462:e03396e14338 243
mbed_official 462:e03396e14338 244 data[count] = (char) value;
mbed_official 462:e03396e14338 245
mbed_official 462:e03396e14338 246 // If not repeated start, send stop.
mbed_official 462:e03396e14338 247 if (stop) {
mbed_official 462:e03396e14338 248 i2c_stop(obj);
mbed_official 462:e03396e14338 249 }
mbed_official 462:e03396e14338 250
mbed_official 462:e03396e14338 251 return length;
mbed_official 462:e03396e14338 252 }
mbed_official 462:e03396e14338 253
mbed_official 462:e03396e14338 254 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 462:e03396e14338 255 int i, status;
mbed_official 462:e03396e14338 256
mbed_official 462:e03396e14338 257 status = i2c_start(obj);
mbed_official 462:e03396e14338 258
mbed_official 462:e03396e14338 259 if ((status != 0x10) && (status != 0x08)) {
mbed_official 462:e03396e14338 260 i2c_stop(obj);
mbed_official 462:e03396e14338 261 return I2C_ERROR_BUS_BUSY;
mbed_official 462:e03396e14338 262 }
mbed_official 462:e03396e14338 263
mbed_official 462:e03396e14338 264 status = i2c_do_write(obj, (address & 0xFE), 1);
mbed_official 462:e03396e14338 265 if (status != 0x18) {
mbed_official 462:e03396e14338 266 i2c_stop(obj);
mbed_official 462:e03396e14338 267 return I2C_ERROR_NO_SLAVE;
mbed_official 462:e03396e14338 268 }
mbed_official 462:e03396e14338 269
mbed_official 462:e03396e14338 270 for (i=0; i<length; i++) {
mbed_official 462:e03396e14338 271 status = i2c_do_write(obj, data[i], 0);
mbed_official 462:e03396e14338 272 if (status != 0x28) {
mbed_official 462:e03396e14338 273 i2c_stop(obj);
mbed_official 462:e03396e14338 274 return i;
mbed_official 462:e03396e14338 275 }
mbed_official 462:e03396e14338 276 }
mbed_official 462:e03396e14338 277
mbed_official 462:e03396e14338 278 // clearing the serial interrupt here might cause an unintended rewrite of the last byte
mbed_official 462:e03396e14338 279 // see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1
mbed_official 462:e03396e14338 280 // i2c_clear_SI(obj);
mbed_official 462:e03396e14338 281
mbed_official 462:e03396e14338 282 // If not repeated start, send stop.
mbed_official 462:e03396e14338 283 if (stop) {
mbed_official 462:e03396e14338 284 i2c_stop(obj);
mbed_official 462:e03396e14338 285 }
mbed_official 462:e03396e14338 286
mbed_official 462:e03396e14338 287 return length;
mbed_official 462:e03396e14338 288 }
mbed_official 462:e03396e14338 289
mbed_official 462:e03396e14338 290 void i2c_reset(i2c_t *obj) {
mbed_official 462:e03396e14338 291 i2c_stop(obj);
mbed_official 462:e03396e14338 292 }
mbed_official 462:e03396e14338 293
mbed_official 462:e03396e14338 294 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 462:e03396e14338 295 return (i2c_do_read(obj, last) & 0xFF);
mbed_official 462:e03396e14338 296 }
mbed_official 462:e03396e14338 297
mbed_official 462:e03396e14338 298 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 462:e03396e14338 299 int ack;
mbed_official 462:e03396e14338 300 int status = i2c_do_write(obj, (data & 0xFF), 0);
mbed_official 462:e03396e14338 301
mbed_official 462:e03396e14338 302 switch(status) {
mbed_official 462:e03396e14338 303 case 0x18: case 0x28: // Master transmit ACKs
mbed_official 462:e03396e14338 304 ack = 1;
mbed_official 462:e03396e14338 305 break;
mbed_official 462:e03396e14338 306
mbed_official 462:e03396e14338 307 case 0x40: // Master receive address transmitted ACK
mbed_official 462:e03396e14338 308 ack = 1;
mbed_official 462:e03396e14338 309 break;
mbed_official 462:e03396e14338 310
mbed_official 462:e03396e14338 311 case 0xB8: // Slave transmit ACK
mbed_official 462:e03396e14338 312 ack = 1;
mbed_official 462:e03396e14338 313 break;
mbed_official 462:e03396e14338 314
mbed_official 462:e03396e14338 315 default:
mbed_official 462:e03396e14338 316 ack = 0;
mbed_official 462:e03396e14338 317 break;
mbed_official 462:e03396e14338 318 }
mbed_official 462:e03396e14338 319
mbed_official 462:e03396e14338 320 return ack;
mbed_official 462:e03396e14338 321 }
mbed_official 462:e03396e14338 322
mbed_official 462:e03396e14338 323 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 462:e03396e14338 324 if (enable_slave != 0) {
mbed_official 462:e03396e14338 325 i2c_conclr(obj, 1, 1, 1, 0);
mbed_official 462:e03396e14338 326 i2c_conset(obj, 0, 0, 0, 1);
mbed_official 462:e03396e14338 327 } else {
mbed_official 462:e03396e14338 328 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 462:e03396e14338 329 }
mbed_official 462:e03396e14338 330 }
mbed_official 462:e03396e14338 331
mbed_official 462:e03396e14338 332 int i2c_slave_receive(i2c_t *obj) {
mbed_official 462:e03396e14338 333 int status;
mbed_official 462:e03396e14338 334 int retval;
mbed_official 462:e03396e14338 335
mbed_official 462:e03396e14338 336 status = i2c_status(obj);
mbed_official 462:e03396e14338 337 switch(status) {
mbed_official 462:e03396e14338 338 case 0x60: retval = 3; break;
mbed_official 462:e03396e14338 339 case 0x70: retval = 2; break;
mbed_official 462:e03396e14338 340 case 0xA8: retval = 1; break;
mbed_official 462:e03396e14338 341 default : retval = 0; break;
mbed_official 462:e03396e14338 342 }
mbed_official 462:e03396e14338 343
mbed_official 462:e03396e14338 344 return(retval);
mbed_official 462:e03396e14338 345 }
mbed_official 462:e03396e14338 346
mbed_official 462:e03396e14338 347 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 462:e03396e14338 348 int count = 0;
mbed_official 462:e03396e14338 349 int status;
mbed_official 462:e03396e14338 350
mbed_official 462:e03396e14338 351 do {
mbed_official 462:e03396e14338 352 i2c_clear_SI(obj);
mbed_official 462:e03396e14338 353 i2c_wait_SI(obj);
mbed_official 462:e03396e14338 354 status = i2c_status(obj);
mbed_official 462:e03396e14338 355 if((status == 0x80) || (status == 0x90)) {
mbed_official 462:e03396e14338 356 data[count] = I2C_DAT(obj) & 0xFF;
mbed_official 462:e03396e14338 357 }
mbed_official 462:e03396e14338 358 count++;
mbed_official 462:e03396e14338 359 } while (((status == 0x80) || (status == 0x90) ||
mbed_official 462:e03396e14338 360 (status == 0x060) || (status == 0x70)) && (count < length));
mbed_official 462:e03396e14338 361
mbed_official 462:e03396e14338 362 if(status != 0xA0) {
mbed_official 462:e03396e14338 363 i2c_stop(obj);
mbed_official 462:e03396e14338 364 }
mbed_official 462:e03396e14338 365
mbed_official 462:e03396e14338 366 i2c_clear_SI(obj);
mbed_official 462:e03396e14338 367
mbed_official 462:e03396e14338 368 return count;
mbed_official 462:e03396e14338 369 }
mbed_official 462:e03396e14338 370
mbed_official 462:e03396e14338 371 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 462:e03396e14338 372 int count = 0;
mbed_official 462:e03396e14338 373 int status;
mbed_official 462:e03396e14338 374
mbed_official 462:e03396e14338 375 if(length <= 0) {
mbed_official 462:e03396e14338 376 return(0);
mbed_official 462:e03396e14338 377 }
mbed_official 462:e03396e14338 378
mbed_official 462:e03396e14338 379 do {
mbed_official 462:e03396e14338 380 status = i2c_do_write(obj, data[count], 0);
mbed_official 462:e03396e14338 381 count++;
mbed_official 462:e03396e14338 382 } while ((count < length) && (status == 0xB8));
mbed_official 462:e03396e14338 383
mbed_official 462:e03396e14338 384 if((status != 0xC0) && (status != 0xC8)) {
mbed_official 462:e03396e14338 385 i2c_stop(obj);
mbed_official 462:e03396e14338 386 }
mbed_official 462:e03396e14338 387
mbed_official 462:e03396e14338 388 i2c_clear_SI(obj);
mbed_official 462:e03396e14338 389
mbed_official 462:e03396e14338 390 return(count);
mbed_official 462:e03396e14338 391 }
mbed_official 462:e03396e14338 392
mbed_official 462:e03396e14338 393 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 462:e03396e14338 394 uint32_t addr;
mbed_official 462:e03396e14338 395
mbed_official 462:e03396e14338 396 if ((idx >= 0) && (idx <= 3)) {
mbed_official 462:e03396e14338 397 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx];
mbed_official 462:e03396e14338 398 *((uint32_t *) addr) = address & 0xFF;
mbed_official 462:e03396e14338 399 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[1][idx];
mbed_official 462:e03396e14338 400 *((uint32_t *) addr) = mask & 0xFE;
mbed_official 462:e03396e14338 401 }
mbed_official 462:e03396e14338 402 }