Ken Todotani / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/i2c_api.c@250:a49055e7a707, 2014-07-08 (annotated)

Committer:
mbed_official
Date:
Tue Jul 08 11:15:08 2014 +0100
Revision:
250:a49055e7a707
Parent:
227:7bd0639b8911
Child:
251:de9a1e4ffd79
Synchronized with git revision 3197042b65f8d28e856e1a7812d45e2fbe80e3f1



Full URL: https://github.com/mbedmicro/mbed/commit/3197042b65f8d28e856e1a7812d45e2fbe80e3f1/



error.h -> mbed_error.h

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 30:91c1d09ada54 1 /* mbed Microcontroller Library
mbed_official 30:91c1d09ada54 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 30:91c1d09ada54 3 *
mbed_official 30:91c1d09ada54 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 30:91c1d09ada54 5 * you may not use this file except in compliance with the License.
mbed_official 30:91c1d09ada54 6 * You may obtain a copy of the License at
mbed_official 30:91c1d09ada54 7 *
mbed_official 30:91c1d09ada54 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 30:91c1d09ada54 9 *
mbed_official 30:91c1d09ada54 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 30:91c1d09ada54 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 30:91c1d09ada54 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 30:91c1d09ada54 13 * See the License for the specific language governing permissions and
mbed_official 30:91c1d09ada54 14 * limitations under the License.
mbed_official 30:91c1d09ada54 15 */
mbed_official 227:7bd0639b8911 16 #include "mbed_assert.h"
mbed_official 30:91c1d09ada54 17 #include "i2c_api.h"
mbed_official 30:91c1d09ada54 18 #include "cmsis.h"
mbed_official 30:91c1d09ada54 19 #include "pinmap.h"
mbed_official 250:a49055e7a707 20 #include "mbed_error.h"
mbed_official 30:91c1d09ada54 21
mbed_official 30:91c1d09ada54 22 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 30:91c1d09ada54 23 {P0_5, I2C_0, 1},
mbed_official 30:91c1d09ada54 24 {NC , NC , 0}
mbed_official 30:91c1d09ada54 25 };
mbed_official 30:91c1d09ada54 26
mbed_official 30:91c1d09ada54 27 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 30:91c1d09ada54 28 {P0_4, I2C_0, 1},
mbed_official 30:91c1d09ada54 29 {NC , NC, 0}
mbed_official 30:91c1d09ada54 30 };
mbed_official 30:91c1d09ada54 31
mbed_official 30:91c1d09ada54 32 #define I2C_CONSET(x) (x->i2c->CONSET)
mbed_official 30:91c1d09ada54 33 #define I2C_CONCLR(x) (x->i2c->CONCLR)
mbed_official 30:91c1d09ada54 34 #define I2C_STAT(x) (x->i2c->STAT)
mbed_official 30:91c1d09ada54 35 #define I2C_DAT(x) (x->i2c->DAT)
mbed_official 30:91c1d09ada54 36 #define I2C_SCLL(x, val) (x->i2c->SCLL = val)
mbed_official 30:91c1d09ada54 37 #define I2C_SCLH(x, val) (x->i2c->SCLH = val)
mbed_official 30:91c1d09ada54 38
mbed_official 30:91c1d09ada54 39 static const uint32_t I2C_addr_offset[2][4] = {
mbed_official 30:91c1d09ada54 40 {0x0C, 0x20, 0x24, 0x28},
mbed_official 30:91c1d09ada54 41 {0x30, 0x34, 0x38, 0x3C}
mbed_official 30:91c1d09ada54 42 };
mbed_official 30:91c1d09ada54 43
mbed_official 30:91c1d09ada54 44 static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
mbed_official 30:91c1d09ada54 45 I2C_CONCLR(obj) = (start << 5)
mbed_official 30:91c1d09ada54 46 | (stop << 4)
mbed_official 30:91c1d09ada54 47 | (interrupt << 3)
mbed_official 30:91c1d09ada54 48 | (acknowledge << 2);
mbed_official 30:91c1d09ada54 49 }
mbed_official 30:91c1d09ada54 50
mbed_official 30:91c1d09ada54 51 static inline void i2c_conset(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
mbed_official 30:91c1d09ada54 52 I2C_CONSET(obj) = (start << 5)
mbed_official 30:91c1d09ada54 53 | (stop << 4)
mbed_official 30:91c1d09ada54 54 | (interrupt << 3)
mbed_official 30:91c1d09ada54 55 | (acknowledge << 2);
mbed_official 30:91c1d09ada54 56 }
mbed_official 30:91c1d09ada54 57
mbed_official 30:91c1d09ada54 58 // Clear the Serial Interrupt (SI)
mbed_official 30:91c1d09ada54 59 static inline void i2c_clear_SI(i2c_t *obj) {
mbed_official 30:91c1d09ada54 60 i2c_conclr(obj, 0, 0, 1, 0);
mbed_official 30:91c1d09ada54 61 }
mbed_official 30:91c1d09ada54 62
mbed_official 30:91c1d09ada54 63 static inline int i2c_status(i2c_t *obj) {
mbed_official 30:91c1d09ada54 64 return I2C_STAT(obj);
mbed_official 30:91c1d09ada54 65 }
mbed_official 30:91c1d09ada54 66
mbed_official 30:91c1d09ada54 67 // Wait until the Serial Interrupt (SI) is set
mbed_official 30:91c1d09ada54 68 static int i2c_wait_SI(i2c_t *obj) {
mbed_official 30:91c1d09ada54 69 int timeout = 0;
mbed_official 30:91c1d09ada54 70 while (!(I2C_CONSET(obj) & (1 << 3))) {
mbed_official 30:91c1d09ada54 71 timeout++;
mbed_official 30:91c1d09ada54 72 if (timeout > 100000) return -1;
mbed_official 30:91c1d09ada54 73 }
mbed_official 30:91c1d09ada54 74 return 0;
mbed_official 30:91c1d09ada54 75 }
mbed_official 30:91c1d09ada54 76
mbed_official 30:91c1d09ada54 77 static inline void i2c_interface_enable(i2c_t *obj) {
mbed_official 30:91c1d09ada54 78 I2C_CONSET(obj) = 0x40;
mbed_official 30:91c1d09ada54 79 }
mbed_official 30:91c1d09ada54 80
mbed_official 30:91c1d09ada54 81 static inline void i2c_power_enable(i2c_t *obj) {
mbed_official 30:91c1d09ada54 82 LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 5);
mbed_official 30:91c1d09ada54 83 LPC_SYSCON->PRESETCTRL |= 1 << 1;
mbed_official 30:91c1d09ada54 84 }
mbed_official 30:91c1d09ada54 85
mbed_official 30:91c1d09ada54 86 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 30:91c1d09ada54 87 // determine the SPI to use
mbed_official 30:91c1d09ada54 88 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 30:91c1d09ada54 89 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 30:91c1d09ada54 90 obj->i2c = (LPC_I2C_TypeDef *)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 91 MBED_ASSERT((int)obj->i2c != NC);
mbed_official 30:91c1d09ada54 92
mbed_official 30:91c1d09ada54 93 // enable power
mbed_official 30:91c1d09ada54 94 i2c_power_enable(obj);
mbed_official 30:91c1d09ada54 95
mbed_official 30:91c1d09ada54 96 // set default frequency at 100k
mbed_official 30:91c1d09ada54 97 i2c_frequency(obj, 100000);
mbed_official 30:91c1d09ada54 98 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 30:91c1d09ada54 99 i2c_interface_enable(obj);
mbed_official 30:91c1d09ada54 100
mbed_official 30:91c1d09ada54 101 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 30:91c1d09ada54 102 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 30:91c1d09ada54 103 }
mbed_official 30:91c1d09ada54 104
mbed_official 30:91c1d09ada54 105 inline int i2c_start(i2c_t *obj) {
mbed_official 30:91c1d09ada54 106 int status = 0;
mbed_official 30:91c1d09ada54 107 // 8.1 Before master mode can be entered, I2CON must be initialised to:
mbed_official 30:91c1d09ada54 108 // - I2EN STA STO SI AA - -
mbed_official 30:91c1d09ada54 109 // - 1 0 0 0 x - -
mbed_official 30:91c1d09ada54 110 // if AA = 0, it can't enter slave mode
mbed_official 30:91c1d09ada54 111 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 30:91c1d09ada54 112
mbed_official 30:91c1d09ada54 113 // The master mode may now be entered by setting the STA bit
mbed_official 30:91c1d09ada54 114 // this will generate a start condition when the bus becomes free
mbed_official 30:91c1d09ada54 115 i2c_conset(obj, 1, 0, 0, 1);
mbed_official 30:91c1d09ada54 116
mbed_official 30:91c1d09ada54 117 i2c_wait_SI(obj);
mbed_official 30:91c1d09ada54 118 status = i2c_status(obj);
mbed_official 30:91c1d09ada54 119
mbed_official 30:91c1d09ada54 120 // Clear start bit now transmitted, and interrupt bit
mbed_official 30:91c1d09ada54 121 i2c_conclr(obj, 1, 0, 0, 0);
mbed_official 30:91c1d09ada54 122 return status;
mbed_official 30:91c1d09ada54 123 }
mbed_official 30:91c1d09ada54 124
mbed_official 30:91c1d09ada54 125 inline int i2c_stop(i2c_t *obj) {
mbed_official 30:91c1d09ada54 126 int timeout = 0;
mbed_official 30:91c1d09ada54 127
mbed_official 30:91c1d09ada54 128 // write the stop bit
mbed_official 30:91c1d09ada54 129 i2c_conset(obj, 0, 1, 0, 0);
mbed_official 30:91c1d09ada54 130 i2c_clear_SI(obj);
mbed_official 30:91c1d09ada54 131
mbed_official 30:91c1d09ada54 132 // wait for STO bit to reset
mbed_official 30:91c1d09ada54 133 while(I2C_CONSET(obj) & (1 << 4)) {
mbed_official 30:91c1d09ada54 134 timeout ++;
mbed_official 30:91c1d09ada54 135 if (timeout > 100000) return 1;
mbed_official 30:91c1d09ada54 136 }
mbed_official 30:91c1d09ada54 137
mbed_official 30:91c1d09ada54 138 return 0;
mbed_official 30:91c1d09ada54 139 }
mbed_official 30:91c1d09ada54 140
mbed_official 30:91c1d09ada54 141
mbed_official 30:91c1d09ada54 142 static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) {
mbed_official 30:91c1d09ada54 143 // write the data
mbed_official 30:91c1d09ada54 144 I2C_DAT(obj) = value;
mbed_official 30:91c1d09ada54 145
mbed_official 30:91c1d09ada54 146 // clear SI to init a send
mbed_official 30:91c1d09ada54 147 i2c_clear_SI(obj);
mbed_official 30:91c1d09ada54 148
mbed_official 30:91c1d09ada54 149 // wait and return status
mbed_official 30:91c1d09ada54 150 i2c_wait_SI(obj);
mbed_official 30:91c1d09ada54 151 return i2c_status(obj);
mbed_official 30:91c1d09ada54 152 }
mbed_official 30:91c1d09ada54 153
mbed_official 30:91c1d09ada54 154 static inline int i2c_do_read(i2c_t *obj, int last) {
mbed_official 30:91c1d09ada54 155 // we are in state 0x40 (SLA+R tx'd) or 0x50 (data rx'd and ack)
mbed_official 30:91c1d09ada54 156 if (last) {
mbed_official 30:91c1d09ada54 157 i2c_conclr(obj, 0, 0, 0, 1); // send a NOT ACK
mbed_official 30:91c1d09ada54 158 } else {
mbed_official 30:91c1d09ada54 159 i2c_conset(obj, 0, 0, 0, 1); // send a ACK
mbed_official 30:91c1d09ada54 160 }
mbed_official 30:91c1d09ada54 161
mbed_official 30:91c1d09ada54 162 // accept byte
mbed_official 30:91c1d09ada54 163 i2c_clear_SI(obj);
mbed_official 30:91c1d09ada54 164
mbed_official 30:91c1d09ada54 165 // wait for it to arrive
mbed_official 30:91c1d09ada54 166 i2c_wait_SI(obj);
mbed_official 30:91c1d09ada54 167
mbed_official 30:91c1d09ada54 168 // return the data
mbed_official 30:91c1d09ada54 169 return (I2C_DAT(obj) & 0xFF);
mbed_official 30:91c1d09ada54 170 }
mbed_official 30:91c1d09ada54 171
mbed_official 30:91c1d09ada54 172 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 30:91c1d09ada54 173 // No peripheral clock divider on the M0
mbed_official 30:91c1d09ada54 174 uint32_t PCLK = SystemCoreClock;
mbed_official 30:91c1d09ada54 175
mbed_official 30:91c1d09ada54 176 uint32_t pulse = PCLK / (hz * 2);
mbed_official 30:91c1d09ada54 177
mbed_official 30:91c1d09ada54 178 // I2C Rate
mbed_official 30:91c1d09ada54 179 I2C_SCLL(obj, pulse);
mbed_official 30:91c1d09ada54 180 I2C_SCLH(obj, pulse);
mbed_official 30:91c1d09ada54 181 }
mbed_official 30:91c1d09ada54 182
mbed_official 30:91c1d09ada54 183 // The I2C does a read or a write as a whole operation
mbed_official 30:91c1d09ada54 184 // There are two types of error conditions it can encounter
mbed_official 30:91c1d09ada54 185 // 1) it can not obtain the bus
mbed_official 30:91c1d09ada54 186 // 2) it gets error responses at part of the transmission
mbed_official 30:91c1d09ada54 187 //
mbed_official 30:91c1d09ada54 188 // We tackle them as follows:
mbed_official 30:91c1d09ada54 189 // 1) we retry until we get the bus. we could have a "timeout" if we can not get it
mbed_official 30:91c1d09ada54 190 // which basically turns it in to a 2)
mbed_official 30:91c1d09ada54 191 // 2) on error, we use the standard error mechanisms to report/debug
mbed_official 30:91c1d09ada54 192 //
mbed_official 30:91c1d09ada54 193 // Therefore an I2C transaction should always complete. If it doesn't it is usually
mbed_official 30:91c1d09ada54 194 // because something is setup wrong (e.g. wiring), and we don't need to programatically
mbed_official 30:91c1d09ada54 195 // check for that
mbed_official 30:91c1d09ada54 196
mbed_official 30:91c1d09ada54 197 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 30:91c1d09ada54 198 int count, status;
mbed_official 30:91c1d09ada54 199
mbed_official 30:91c1d09ada54 200 status = i2c_start(obj);
mbed_official 30:91c1d09ada54 201
mbed_official 30:91c1d09ada54 202 if ((status != 0x10) && (status != 0x08)) {
mbed_official 30:91c1d09ada54 203 i2c_stop(obj);
mbed_official 30:91c1d09ada54 204 return I2C_ERROR_BUS_BUSY;
mbed_official 30:91c1d09ada54 205 }
mbed_official 30:91c1d09ada54 206
mbed_official 30:91c1d09ada54 207 status = i2c_do_write(obj, (address | 0x01), 1);
mbed_official 30:91c1d09ada54 208 if (status != 0x40) {
mbed_official 30:91c1d09ada54 209 i2c_stop(obj);
mbed_official 30:91c1d09ada54 210 return I2C_ERROR_NO_SLAVE;
mbed_official 30:91c1d09ada54 211 }
mbed_official 30:91c1d09ada54 212
mbed_official 30:91c1d09ada54 213 // Read in all except last byte
mbed_official 30:91c1d09ada54 214 for (count = 0; count < (length - 1); count++) {
mbed_official 30:91c1d09ada54 215 int value = i2c_do_read(obj, 0);
mbed_official 30:91c1d09ada54 216 status = i2c_status(obj);
mbed_official 30:91c1d09ada54 217 if (status != 0x50) {
mbed_official 30:91c1d09ada54 218 i2c_stop(obj);
mbed_official 30:91c1d09ada54 219 return count;
mbed_official 30:91c1d09ada54 220 }
mbed_official 30:91c1d09ada54 221 data[count] = (char) value;
mbed_official 30:91c1d09ada54 222 }
mbed_official 30:91c1d09ada54 223
mbed_official 30:91c1d09ada54 224 // read in last byte
mbed_official 30:91c1d09ada54 225 int value = i2c_do_read(obj, 1);
mbed_official 30:91c1d09ada54 226 status = i2c_status(obj);
mbed_official 30:91c1d09ada54 227 if (status != 0x58) {
mbed_official 30:91c1d09ada54 228 i2c_stop(obj);
mbed_official 30:91c1d09ada54 229 return length - 1;
mbed_official 30:91c1d09ada54 230 }
mbed_official 30:91c1d09ada54 231
mbed_official 30:91c1d09ada54 232 data[count] = (char) value;
mbed_official 30:91c1d09ada54 233
mbed_official 30:91c1d09ada54 234 // If not repeated start, send stop.
mbed_official 30:91c1d09ada54 235 if (stop) {
mbed_official 30:91c1d09ada54 236 i2c_stop(obj);
mbed_official 30:91c1d09ada54 237 }
mbed_official 30:91c1d09ada54 238
mbed_official 30:91c1d09ada54 239 return length;
mbed_official 30:91c1d09ada54 240 }
mbed_official 30:91c1d09ada54 241
mbed_official 30:91c1d09ada54 242 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 30:91c1d09ada54 243 int i, status;
mbed_official 30:91c1d09ada54 244
mbed_official 30:91c1d09ada54 245 status = i2c_start(obj);
mbed_official 30:91c1d09ada54 246
mbed_official 30:91c1d09ada54 247 if ((status != 0x10) && (status != 0x08)) {
mbed_official 30:91c1d09ada54 248 i2c_stop(obj);
mbed_official 30:91c1d09ada54 249 return I2C_ERROR_BUS_BUSY;
mbed_official 30:91c1d09ada54 250 }
mbed_official 30:91c1d09ada54 251
mbed_official 30:91c1d09ada54 252 status = i2c_do_write(obj, (address & 0xFE), 1);
mbed_official 30:91c1d09ada54 253 if (status != 0x18) {
mbed_official 30:91c1d09ada54 254 i2c_stop(obj);
mbed_official 30:91c1d09ada54 255 return I2C_ERROR_NO_SLAVE;
mbed_official 30:91c1d09ada54 256 }
mbed_official 30:91c1d09ada54 257
mbed_official 30:91c1d09ada54 258 for (i=0; i<length; i++) {
mbed_official 30:91c1d09ada54 259 status = i2c_do_write(obj, data[i], 0);
mbed_official 30:91c1d09ada54 260 if(status != 0x28) {
mbed_official 30:91c1d09ada54 261 i2c_stop(obj);
mbed_official 30:91c1d09ada54 262 return i;
mbed_official 30:91c1d09ada54 263 }
mbed_official 30:91c1d09ada54 264 }
mbed_official 30:91c1d09ada54 265
mbed_official 30:91c1d09ada54 266 // clearing the serial interrupt here might cause an unintended rewrite of the last byte
mbed_official 30:91c1d09ada54 267 // see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1
mbed_official 30:91c1d09ada54 268 // i2c_clear_SI(obj);
mbed_official 30:91c1d09ada54 269
mbed_official 30:91c1d09ada54 270 // If not repeated start, send stop.
mbed_official 30:91c1d09ada54 271 if (stop) {
mbed_official 30:91c1d09ada54 272 i2c_stop(obj);
mbed_official 30:91c1d09ada54 273 }
mbed_official 30:91c1d09ada54 274
mbed_official 30:91c1d09ada54 275 return length;
mbed_official 30:91c1d09ada54 276 }
mbed_official 30:91c1d09ada54 277
mbed_official 30:91c1d09ada54 278 void i2c_reset(i2c_t *obj) {
mbed_official 30:91c1d09ada54 279 i2c_stop(obj);
mbed_official 30:91c1d09ada54 280 }
mbed_official 30:91c1d09ada54 281
mbed_official 30:91c1d09ada54 282 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 30:91c1d09ada54 283 return (i2c_do_read(obj, last) & 0xFF);
mbed_official 30:91c1d09ada54 284 }
mbed_official 30:91c1d09ada54 285
mbed_official 30:91c1d09ada54 286 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 30:91c1d09ada54 287 int ack;
mbed_official 30:91c1d09ada54 288 int status = i2c_do_write(obj, (data & 0xFF), 0);
mbed_official 30:91c1d09ada54 289
mbed_official 30:91c1d09ada54 290 switch(status) {
mbed_official 30:91c1d09ada54 291 case 0x18: case 0x28: // Master transmit ACKs
mbed_official 30:91c1d09ada54 292 ack = 1;
mbed_official 30:91c1d09ada54 293 break;
mbed_official 30:91c1d09ada54 294 case 0x40: // Master receive address transmitted ACK
mbed_official 30:91c1d09ada54 295 ack = 1;
mbed_official 30:91c1d09ada54 296 break;
mbed_official 30:91c1d09ada54 297 case 0xB8: // Slave transmit ACK
mbed_official 30:91c1d09ada54 298 ack = 1;
mbed_official 30:91c1d09ada54 299 break;
mbed_official 30:91c1d09ada54 300 default:
mbed_official 30:91c1d09ada54 301 ack = 0;
mbed_official 30:91c1d09ada54 302 break;
mbed_official 30:91c1d09ada54 303 }
mbed_official 30:91c1d09ada54 304
mbed_official 30:91c1d09ada54 305 return ack;
mbed_official 30:91c1d09ada54 306 }
mbed_official 30:91c1d09ada54 307
mbed_official 30:91c1d09ada54 308 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 30:91c1d09ada54 309 if (enable_slave != 0) {
mbed_official 30:91c1d09ada54 310 i2c_conclr(obj, 1, 1, 1, 0);
mbed_official 30:91c1d09ada54 311 i2c_conset(obj, 0, 0, 0, 1);
mbed_official 30:91c1d09ada54 312 } else {
mbed_official 30:91c1d09ada54 313 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 30:91c1d09ada54 314 }
mbed_official 30:91c1d09ada54 315 }
mbed_official 30:91c1d09ada54 316
mbed_official 30:91c1d09ada54 317 int i2c_slave_receive(i2c_t *obj) {
mbed_official 30:91c1d09ada54 318 int status;
mbed_official 30:91c1d09ada54 319 int retval;
mbed_official 30:91c1d09ada54 320
mbed_official 30:91c1d09ada54 321 status = i2c_status(obj);
mbed_official 30:91c1d09ada54 322 switch(status) {
mbed_official 30:91c1d09ada54 323 case 0x60: retval = 3; break;
mbed_official 30:91c1d09ada54 324 case 0x70: retval = 2; break;
mbed_official 30:91c1d09ada54 325 case 0xA8: retval = 1; break;
mbed_official 30:91c1d09ada54 326 default : retval = 0; break;
mbed_official 30:91c1d09ada54 327 }
mbed_official 30:91c1d09ada54 328
mbed_official 30:91c1d09ada54 329 return(retval);
mbed_official 30:91c1d09ada54 330 }
mbed_official 30:91c1d09ada54 331
mbed_official 30:91c1d09ada54 332 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 30:91c1d09ada54 333 int count = 0;
mbed_official 30:91c1d09ada54 334 int status;
mbed_official 30:91c1d09ada54 335
mbed_official 30:91c1d09ada54 336 do {
mbed_official 30:91c1d09ada54 337 i2c_clear_SI(obj);
mbed_official 30:91c1d09ada54 338 i2c_wait_SI(obj);
mbed_official 30:91c1d09ada54 339 status = i2c_status(obj);
mbed_official 30:91c1d09ada54 340 if((status == 0x80) || (status == 0x90)) {
mbed_official 30:91c1d09ada54 341 data[count] = I2C_DAT(obj) & 0xFF;
mbed_official 30:91c1d09ada54 342 }
mbed_official 30:91c1d09ada54 343 count++;
mbed_official 30:91c1d09ada54 344 } while (((status == 0x80) || (status == 0x90) ||
mbed_official 30:91c1d09ada54 345 (status == 0x060) || (status == 0x70)) && (count < length));
mbed_official 30:91c1d09ada54 346
mbed_official 30:91c1d09ada54 347 if(status != 0xA0) {
mbed_official 30:91c1d09ada54 348 i2c_stop(obj);
mbed_official 30:91c1d09ada54 349 }
mbed_official 30:91c1d09ada54 350
mbed_official 30:91c1d09ada54 351 i2c_clear_SI(obj);
mbed_official 30:91c1d09ada54 352
mbed_official 30:91c1d09ada54 353 return count;
mbed_official 30:91c1d09ada54 354 }
mbed_official 30:91c1d09ada54 355
mbed_official 30:91c1d09ada54 356 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 30:91c1d09ada54 357 int count = 0;
mbed_official 30:91c1d09ada54 358 int status;
mbed_official 30:91c1d09ada54 359
mbed_official 30:91c1d09ada54 360 if(length <= 0) {
mbed_official 30:91c1d09ada54 361 return(0);
mbed_official 30:91c1d09ada54 362 }
mbed_official 30:91c1d09ada54 363
mbed_official 30:91c1d09ada54 364 do {
mbed_official 30:91c1d09ada54 365 status = i2c_do_write(obj, data[count], 0);
mbed_official 30:91c1d09ada54 366 count++;
mbed_official 30:91c1d09ada54 367 } while ((count < length) && (status == 0xB8));
mbed_official 30:91c1d09ada54 368
mbed_official 30:91c1d09ada54 369 if((status != 0xC0) && (status != 0xC8)) {
mbed_official 30:91c1d09ada54 370 i2c_stop(obj);
mbed_official 30:91c1d09ada54 371 }
mbed_official 30:91c1d09ada54 372
mbed_official 30:91c1d09ada54 373 i2c_clear_SI(obj);
mbed_official 30:91c1d09ada54 374
mbed_official 30:91c1d09ada54 375 return(count);
mbed_official 30:91c1d09ada54 376 }
mbed_official 30:91c1d09ada54 377
mbed_official 30:91c1d09ada54 378 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 30:91c1d09ada54 379 uint32_t addr;
mbed_official 30:91c1d09ada54 380
mbed_official 30:91c1d09ada54 381 if ((idx >= 0) && (idx <= 3)) {
mbed_official 30:91c1d09ada54 382 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx];
mbed_official 30:91c1d09ada54 383 *((uint32_t *) addr) = address & 0xFF;
mbed_official 30:91c1d09ada54 384 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[1][idx];
mbed_official 30:91c1d09ada54 385 *((uint32_t *) addr) = mask & 0xFE;
mbed_official 30:91c1d09ada54 386 }
mbed_official 30:91c1d09ada54 387 }