shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC408X/i2c_api.c@323:9e901b0a5aa1, 2014-09-13 (annotated)

Committer:
shaoziyang
Date:
Sat Sep 13 14:25:46 2014 +0000
Revision:
323:9e901b0a5aa1
Parent:
227:7bd0639b8911 
test with CLOCK_SETUP = 0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 15:4892fe388435 1 /* mbed Microcontroller Library
bogdanm 15:4892fe388435 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 15:4892fe388435 3 *
bogdanm 15:4892fe388435 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 15:4892fe388435 5 * you may not use this file except in compliance with the License.
bogdanm 15:4892fe388435 6 * You may obtain a copy of the License at
bogdanm 15:4892fe388435 7 *
bogdanm 15:4892fe388435 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 15:4892fe388435 9 *
bogdanm 15:4892fe388435 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 15:4892fe388435 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 15:4892fe388435 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 15:4892fe388435 13 * See the License for the specific language governing permissions and
bogdanm 15:4892fe388435 14 * limitations under the License.
bogdanm 15:4892fe388435 15 */
mbed_official 227:7bd0639b8911 16 #include "mbed_assert.h"
bogdanm 15:4892fe388435 17 #include "i2c_api.h"
bogdanm 15:4892fe388435 18 #include "cmsis.h"
bogdanm 15:4892fe388435 19 #include "pinmap.h"
bogdanm 15:4892fe388435 20
bogdanm 15:4892fe388435 21 static const PinMap PinMap_I2C_SDA[] = {
bogdanm 15:4892fe388435 22 {P0_0 , I2C_1, 3},
bogdanm 15:4892fe388435 23 {P0_10, I2C_2, 2},
bogdanm 15:4892fe388435 24 {P0_19, I2C_1, 3},
bogdanm 15:4892fe388435 25 {P0_27, I2C_0, 1},
bogdanm 15:4892fe388435 26 {P1_15, I2C_2, 3},
bogdanm 15:4892fe388435 27 {P1_30, I2C_0, 4},
bogdanm 15:4892fe388435 28 {P2_14, I2C_1, 2},
bogdanm 15:4892fe388435 29 {P2_30, I2C_2, 2},
bogdanm 15:4892fe388435 30 {P4_20, I2C_2, 4},
bogdanm 15:4892fe388435 31 {P5_2, I2C_0, 5},
bogdanm 15:4892fe388435 32 {NC , NC , 0}
bogdanm 15:4892fe388435 33 };
bogdanm 15:4892fe388435 34
bogdanm 15:4892fe388435 35 static const PinMap PinMap_I2C_SCL[] = {
bogdanm 15:4892fe388435 36 {P0_1 , I2C_1, 3},
bogdanm 15:4892fe388435 37 {P0_11, I2C_2, 2},
bogdanm 15:4892fe388435 38 {P0_20, I2C_1, 3},
bogdanm 15:4892fe388435 39 {P0_28, I2C_0, 1},
bogdanm 15:4892fe388435 40 {P1_31, I2C_0, 4},
bogdanm 15:4892fe388435 41 {P2_15, I2C_1, 2},
bogdanm 15:4892fe388435 42 {P2_31, I2C_2, 2},
bogdanm 15:4892fe388435 43 {P4_21, I2C_2, 2},
bogdanm 15:4892fe388435 44 {P4_29, I2C_2, 4},
bogdanm 15:4892fe388435 45 {P5_3, I2C_0, 5},
bogdanm 15:4892fe388435 46 {NC , NC, 0}
bogdanm 15:4892fe388435 47 };
bogdanm 15:4892fe388435 48
bogdanm 15:4892fe388435 49 #define I2C_CONSET(x) (x->i2c->CONSET)
bogdanm 15:4892fe388435 50 #define I2C_CONCLR(x) (x->i2c->CONCLR)
bogdanm 15:4892fe388435 51 #define I2C_STAT(x) (x->i2c->STAT)
bogdanm 15:4892fe388435 52 #define I2C_DAT(x) (x->i2c->DAT)
bogdanm 15:4892fe388435 53 #define I2C_SCLL(x, val) (x->i2c->SCLL = val)
bogdanm 15:4892fe388435 54 #define I2C_SCLH(x, val) (x->i2c->SCLH = val)
bogdanm 15:4892fe388435 55
bogdanm 15:4892fe388435 56 static const uint32_t I2C_addr_offset[2][4] = {
bogdanm 15:4892fe388435 57 {0x0C, 0x20, 0x24, 0x28},
bogdanm 15:4892fe388435 58 {0x30, 0x34, 0x38, 0x3C}
bogdanm 15:4892fe388435 59 };
bogdanm 15:4892fe388435 60
bogdanm 15:4892fe388435 61 static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
bogdanm 15:4892fe388435 62 I2C_CONCLR(obj) = (start << 5)
bogdanm 15:4892fe388435 63 | (stop << 4)
bogdanm 15:4892fe388435 64 | (interrupt << 3)
bogdanm 15:4892fe388435 65 | (acknowledge << 2);
bogdanm 15:4892fe388435 66 }
bogdanm 15:4892fe388435 67
bogdanm 15:4892fe388435 68 static inline void i2c_conset(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
bogdanm 15:4892fe388435 69 I2C_CONSET(obj) = (start << 5)
bogdanm 15:4892fe388435 70 | (stop << 4)
bogdanm 15:4892fe388435 71 | (interrupt << 3)
bogdanm 15:4892fe388435 72 | (acknowledge << 2);
bogdanm 15:4892fe388435 73 }
bogdanm 15:4892fe388435 74
bogdanm 15:4892fe388435 75 // Clear the Serial Interrupt (SI)
bogdanm 15:4892fe388435 76 static inline void i2c_clear_SI(i2c_t *obj) {
bogdanm 15:4892fe388435 77 i2c_conclr(obj, 0, 0, 1, 0);
bogdanm 15:4892fe388435 78 }
bogdanm 15:4892fe388435 79
bogdanm 15:4892fe388435 80 static inline int i2c_status(i2c_t *obj) {
bogdanm 15:4892fe388435 81 return I2C_STAT(obj);
bogdanm 15:4892fe388435 82 }
bogdanm 15:4892fe388435 83
bogdanm 15:4892fe388435 84 // Wait until the Serial Interrupt (SI) is set
bogdanm 15:4892fe388435 85 static int i2c_wait_SI(i2c_t *obj) {
bogdanm 15:4892fe388435 86 int timeout = 0;
bogdanm 15:4892fe388435 87 while (!(I2C_CONSET(obj) & (1 << 3))) {
bogdanm 15:4892fe388435 88 timeout++;
bogdanm 15:4892fe388435 89 if (timeout > 100000) return -1;
bogdanm 15:4892fe388435 90 }
bogdanm 15:4892fe388435 91 return 0;
bogdanm 15:4892fe388435 92 }
bogdanm 15:4892fe388435 93
bogdanm 15:4892fe388435 94 static inline void i2c_interface_enable(i2c_t *obj) {
bogdanm 15:4892fe388435 95 I2C_CONSET(obj) = 0x40;
bogdanm 15:4892fe388435 96 }
bogdanm 15:4892fe388435 97
bogdanm 15:4892fe388435 98 static inline void i2c_power_enable(i2c_t *obj) {
bogdanm 15:4892fe388435 99 switch ((int)obj->i2c) {
bogdanm 15:4892fe388435 100 case I2C_0: LPC_SC->PCONP |= 1 << 7; break;
bogdanm 15:4892fe388435 101 case I2C_1: LPC_SC->PCONP |= 1 << 19; break;
bogdanm 15:4892fe388435 102 case I2C_2: LPC_SC->PCONP |= 1 << 26; break;
bogdanm 15:4892fe388435 103 }
bogdanm 15:4892fe388435 104 }
bogdanm 15:4892fe388435 105
bogdanm 15:4892fe388435 106 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
bogdanm 15:4892fe388435 107 // determine the SPI to use
bogdanm 15:4892fe388435 108 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
bogdanm 15:4892fe388435 109 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
bogdanm 15:4892fe388435 110 obj->i2c = (LPC_I2C_TypeDef *)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 227:7bd0639b8911 111 MBED_ASSERT((int)obj->i2c != NC);
bogdanm 15:4892fe388435 112
bogdanm 15:4892fe388435 113 // enable power
bogdanm 15:4892fe388435 114 i2c_power_enable(obj);
bogdanm 15:4892fe388435 115
bogdanm 15:4892fe388435 116 // set default frequency at 100k
bogdanm 15:4892fe388435 117 i2c_frequency(obj, 100000);
bogdanm 15:4892fe388435 118 i2c_conclr(obj, 1, 1, 1, 1);
bogdanm 15:4892fe388435 119 i2c_interface_enable(obj);
bogdanm 15:4892fe388435 120
bogdanm 15:4892fe388435 121 pinmap_pinout(sda, PinMap_I2C_SDA);
bogdanm 15:4892fe388435 122 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 34:a3c7023e45de 123
mbed_official 34:a3c7023e45de 124 // OpenDrain must explicitly be enabled for p0.0 and p0.1
mbed_official 34:a3c7023e45de 125 if (sda == P0_0) {
mbed_official 34:a3c7023e45de 126 pin_mode(sda, OpenDrain);
mbed_official 34:a3c7023e45de 127 }
mbed_official 34:a3c7023e45de 128 if (scl == P0_1) {
mbed_official 34:a3c7023e45de 129 pin_mode(scl, OpenDrain);
mbed_official 34:a3c7023e45de 130 }
mbed_official 34:a3c7023e45de 131
bogdanm 15:4892fe388435 132 }
bogdanm 15:4892fe388435 133
bogdanm 15:4892fe388435 134 inline int i2c_start(i2c_t *obj) {
bogdanm 15:4892fe388435 135 int status = 0;
bogdanm 15:4892fe388435 136 // 8.1 Before master mode can be entered, I2CON must be initialised to:
bogdanm 15:4892fe388435 137 // - I2EN STA STO SI AA - -
bogdanm 15:4892fe388435 138 // - 1 0 0 0 x - -
bogdanm 15:4892fe388435 139 // if AA = 0, it can't enter slave mode
bogdanm 15:4892fe388435 140 i2c_conclr(obj, 1, 1, 1, 1);
bogdanm 15:4892fe388435 141
bogdanm 15:4892fe388435 142 // The master mode may now be entered by setting the STA bit
bogdanm 15:4892fe388435 143 // this will generate a start condition when the bus becomes free
bogdanm 15:4892fe388435 144 i2c_conset(obj, 1, 0, 0, 1);
bogdanm 15:4892fe388435 145
bogdanm 15:4892fe388435 146 i2c_wait_SI(obj);
bogdanm 15:4892fe388435 147 status = i2c_status(obj);
bogdanm 15:4892fe388435 148
bogdanm 15:4892fe388435 149 // Clear start bit now transmitted, and interrupt bit
bogdanm 15:4892fe388435 150 i2c_conclr(obj, 1, 0, 0, 0);
bogdanm 15:4892fe388435 151 return status;
bogdanm 15:4892fe388435 152 }
bogdanm 15:4892fe388435 153
bogdanm 15:4892fe388435 154 inline int i2c_stop(i2c_t *obj) {
bogdanm 15:4892fe388435 155 int timeout = 0;
bogdanm 15:4892fe388435 156
bogdanm 15:4892fe388435 157 // write the stop bit
bogdanm 15:4892fe388435 158 i2c_conset(obj, 0, 1, 0, 0);
bogdanm 15:4892fe388435 159 i2c_clear_SI(obj);
bogdanm 15:4892fe388435 160
bogdanm 15:4892fe388435 161 // wait for STO bit to reset
bogdanm 15:4892fe388435 162 while(I2C_CONSET(obj) & (1 << 4)) {
bogdanm 15:4892fe388435 163 timeout ++;
bogdanm 15:4892fe388435 164 if (timeout > 100000) return 1;
bogdanm 15:4892fe388435 165 }
bogdanm 15:4892fe388435 166
bogdanm 15:4892fe388435 167 return 0;
bogdanm 15:4892fe388435 168 }
bogdanm 15:4892fe388435 169
bogdanm 15:4892fe388435 170
bogdanm 15:4892fe388435 171 static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) {
bogdanm 15:4892fe388435 172 // write the data
bogdanm 15:4892fe388435 173 I2C_DAT(obj) = value;
bogdanm 15:4892fe388435 174
bogdanm 15:4892fe388435 175 // clear SI to init a send
bogdanm 15:4892fe388435 176 i2c_clear_SI(obj);
bogdanm 15:4892fe388435 177
bogdanm 15:4892fe388435 178 // wait and return status
bogdanm 15:4892fe388435 179 i2c_wait_SI(obj);
bogdanm 15:4892fe388435 180 return i2c_status(obj);
bogdanm 15:4892fe388435 181 }
bogdanm 15:4892fe388435 182
bogdanm 15:4892fe388435 183 static inline int i2c_do_read(i2c_t *obj, int last) {
bogdanm 15:4892fe388435 184 // we are in state 0x40 (SLA+R tx'd) or 0x50 (data rx'd and ack)
bogdanm 15:4892fe388435 185 if(last) {
bogdanm 15:4892fe388435 186 i2c_conclr(obj, 0, 0, 0, 1); // send a NOT ACK
bogdanm 15:4892fe388435 187 } else {
bogdanm 15:4892fe388435 188 i2c_conset(obj, 0, 0, 0, 1); // send a ACK
bogdanm 15:4892fe388435 189 }
bogdanm 15:4892fe388435 190
bogdanm 15:4892fe388435 191 // accept byte
bogdanm 15:4892fe388435 192 i2c_clear_SI(obj);
bogdanm 15:4892fe388435 193
bogdanm 15:4892fe388435 194 // wait for it to arrive
bogdanm 15:4892fe388435 195 i2c_wait_SI(obj);
bogdanm 15:4892fe388435 196
bogdanm 15:4892fe388435 197 // return the data
bogdanm 15:4892fe388435 198 return (I2C_DAT(obj) & 0xFF);
bogdanm 15:4892fe388435 199 }
bogdanm 15:4892fe388435 200
bogdanm 15:4892fe388435 201 void i2c_frequency(i2c_t *obj, int hz) {
bogdanm 15:4892fe388435 202 uint32_t PCLK = PeripheralClock;
bogdanm 15:4892fe388435 203 uint32_t pulse = PCLK / (hz * 2);
bogdanm 15:4892fe388435 204
bogdanm 15:4892fe388435 205 // I2C Rate
bogdanm 15:4892fe388435 206 I2C_SCLL(obj, pulse);
bogdanm 15:4892fe388435 207 I2C_SCLH(obj, pulse);
bogdanm 15:4892fe388435 208 }
bogdanm 15:4892fe388435 209
bogdanm 15:4892fe388435 210 // The I2C does a read or a write as a whole operation
bogdanm 15:4892fe388435 211 // There are two types of error conditions it can encounter
bogdanm 15:4892fe388435 212 // 1) it can not obtain the bus
bogdanm 15:4892fe388435 213 // 2) it gets error responses at part of the transmission
bogdanm 15:4892fe388435 214 //
bogdanm 15:4892fe388435 215 // We tackle them as follows:
bogdanm 15:4892fe388435 216 // 1) we retry until we get the bus. we could have a "timeout" if we can not get it
bogdanm 15:4892fe388435 217 // which basically turns it in to a 2)
bogdanm 15:4892fe388435 218 // 2) on error, we use the standard error mechanisms to report/debug
bogdanm 15:4892fe388435 219 //
bogdanm 15:4892fe388435 220 // Therefore an I2C transaction should always complete. If it doesn't it is usually
bogdanm 15:4892fe388435 221 // because something is setup wrong (e.g. wiring), and we don't need to programatically
bogdanm 15:4892fe388435 222 // check for that
bogdanm 15:4892fe388435 223 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
bogdanm 15:4892fe388435 224 int count, status;
bogdanm 15:4892fe388435 225
bogdanm 15:4892fe388435 226 status = i2c_start(obj);
bogdanm 15:4892fe388435 227
bogdanm 15:4892fe388435 228 if ((status != 0x10) && (status != 0x08)) {
bogdanm 15:4892fe388435 229 i2c_stop(obj);
bogdanm 15:4892fe388435 230 return I2C_ERROR_BUS_BUSY;
bogdanm 15:4892fe388435 231 }
bogdanm 15:4892fe388435 232
bogdanm 15:4892fe388435 233 status = i2c_do_write(obj, (address | 0x01), 1);
bogdanm 15:4892fe388435 234 if (status != 0x40) {
bogdanm 15:4892fe388435 235 i2c_stop(obj);
bogdanm 15:4892fe388435 236 return I2C_ERROR_NO_SLAVE;
bogdanm 15:4892fe388435 237 }
bogdanm 15:4892fe388435 238
bogdanm 15:4892fe388435 239 // Read in all except last byte
bogdanm 15:4892fe388435 240 for (count = 0; count < (length - 1); count++) {
bogdanm 15:4892fe388435 241 int value = i2c_do_read(obj, 0);
bogdanm 15:4892fe388435 242 status = i2c_status(obj);
bogdanm 15:4892fe388435 243 if (status != 0x50) {
bogdanm 15:4892fe388435 244 i2c_stop(obj);
bogdanm 15:4892fe388435 245 return count;
bogdanm 15:4892fe388435 246 }
bogdanm 15:4892fe388435 247 data[count] = (char) value;
bogdanm 15:4892fe388435 248 }
bogdanm 15:4892fe388435 249
bogdanm 15:4892fe388435 250 // read in last byte
bogdanm 15:4892fe388435 251 int value = i2c_do_read(obj, 1);
bogdanm 15:4892fe388435 252 status = i2c_status(obj);
bogdanm 15:4892fe388435 253 if (status != 0x58) {
bogdanm 15:4892fe388435 254 i2c_stop(obj);
bogdanm 15:4892fe388435 255 return length - 1;
bogdanm 15:4892fe388435 256 }
bogdanm 15:4892fe388435 257
bogdanm 15:4892fe388435 258 data[count] = (char) value;
bogdanm 15:4892fe388435 259
bogdanm 15:4892fe388435 260 // If not repeated start, send stop.
bogdanm 15:4892fe388435 261 if (stop) {
bogdanm 15:4892fe388435 262 i2c_stop(obj);
bogdanm 15:4892fe388435 263 }
bogdanm 15:4892fe388435 264
bogdanm 15:4892fe388435 265 return length;
bogdanm 15:4892fe388435 266 }
bogdanm 15:4892fe388435 267
bogdanm 15:4892fe388435 268 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
bogdanm 15:4892fe388435 269 int i, status;
bogdanm 15:4892fe388435 270
bogdanm 15:4892fe388435 271 status = i2c_start(obj);
bogdanm 15:4892fe388435 272
bogdanm 15:4892fe388435 273 if ((status != 0x10) && (status != 0x08)) {
bogdanm 15:4892fe388435 274 i2c_stop(obj);
bogdanm 15:4892fe388435 275 return I2C_ERROR_BUS_BUSY;
bogdanm 15:4892fe388435 276 }
bogdanm 15:4892fe388435 277
bogdanm 15:4892fe388435 278 status = i2c_do_write(obj, (address & 0xFE), 1);
bogdanm 15:4892fe388435 279 if (status != 0x18) {
bogdanm 15:4892fe388435 280 i2c_stop(obj);
bogdanm 15:4892fe388435 281 return I2C_ERROR_NO_SLAVE;
bogdanm 15:4892fe388435 282 }
bogdanm 15:4892fe388435 283
bogdanm 15:4892fe388435 284 for (i=0; i<length; i++) {
bogdanm 15:4892fe388435 285 status = i2c_do_write(obj, data[i], 0);
bogdanm 15:4892fe388435 286 if (status != 0x28) {
bogdanm 15:4892fe388435 287 i2c_stop(obj);
bogdanm 15:4892fe388435 288 return i;
bogdanm 15:4892fe388435 289 }
bogdanm 15:4892fe388435 290 }
bogdanm 15:4892fe388435 291
bogdanm 15:4892fe388435 292 // clearing the serial interrupt here might cause an unintended rewrite of the last byte
bogdanm 15:4892fe388435 293 // see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1
bogdanm 15:4892fe388435 294 // i2c_clear_SI(obj);
bogdanm 15:4892fe388435 295
bogdanm 15:4892fe388435 296 // If not repeated start, send stop.
bogdanm 15:4892fe388435 297 if (stop) {
bogdanm 15:4892fe388435 298 i2c_stop(obj);
bogdanm 15:4892fe388435 299 }
bogdanm 15:4892fe388435 300
bogdanm 15:4892fe388435 301 return length;
bogdanm 15:4892fe388435 302 }
bogdanm 15:4892fe388435 303
bogdanm 15:4892fe388435 304 void i2c_reset(i2c_t *obj) {
bogdanm 15:4892fe388435 305 i2c_stop(obj);
bogdanm 15:4892fe388435 306 }
bogdanm 15:4892fe388435 307
bogdanm 15:4892fe388435 308 int i2c_byte_read(i2c_t *obj, int last) {
bogdanm 15:4892fe388435 309 return (i2c_do_read(obj, last) & 0xFF);
bogdanm 15:4892fe388435 310 }
bogdanm 15:4892fe388435 311
bogdanm 15:4892fe388435 312 int i2c_byte_write(i2c_t *obj, int data) {
bogdanm 15:4892fe388435 313 int ack;
bogdanm 15:4892fe388435 314 int status = i2c_do_write(obj, (data & 0xFF), 0);
bogdanm 15:4892fe388435 315
bogdanm 15:4892fe388435 316 switch(status) {
bogdanm 15:4892fe388435 317 case 0x18: case 0x28: // Master transmit ACKs
bogdanm 15:4892fe388435 318 ack = 1;
bogdanm 15:4892fe388435 319 break;
bogdanm 15:4892fe388435 320
bogdanm 15:4892fe388435 321 case 0x40: // Master receive address transmitted ACK
bogdanm 15:4892fe388435 322 ack = 1;
bogdanm 15:4892fe388435 323 break;
bogdanm 15:4892fe388435 324
bogdanm 15:4892fe388435 325 case 0xB8: // Slave transmit ACK
bogdanm 15:4892fe388435 326 ack = 1;
bogdanm 15:4892fe388435 327 break;
bogdanm 15:4892fe388435 328
bogdanm 15:4892fe388435 329 default:
bogdanm 15:4892fe388435 330 ack = 0;
bogdanm 15:4892fe388435 331 break;
bogdanm 15:4892fe388435 332 }
bogdanm 15:4892fe388435 333
bogdanm 15:4892fe388435 334 return ack;
bogdanm 15:4892fe388435 335 }
bogdanm 15:4892fe388435 336
bogdanm 15:4892fe388435 337 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
bogdanm 15:4892fe388435 338 if (enable_slave != 0) {
bogdanm 15:4892fe388435 339 i2c_conclr(obj, 1, 1, 1, 0);
bogdanm 15:4892fe388435 340 i2c_conset(obj, 0, 0, 0, 1);
bogdanm 15:4892fe388435 341 } else {
bogdanm 15:4892fe388435 342 i2c_conclr(obj, 1, 1, 1, 1);
bogdanm 15:4892fe388435 343 }
bogdanm 15:4892fe388435 344 }
bogdanm 15:4892fe388435 345
bogdanm 15:4892fe388435 346 int i2c_slave_receive(i2c_t *obj) {
bogdanm 15:4892fe388435 347 int status;
bogdanm 15:4892fe388435 348 int retval;
bogdanm 15:4892fe388435 349
bogdanm 15:4892fe388435 350 status = i2c_status(obj);
bogdanm 15:4892fe388435 351 switch(status) {
bogdanm 15:4892fe388435 352 case 0x60: retval = 3; break;
bogdanm 15:4892fe388435 353 case 0x70: retval = 2; break;
bogdanm 15:4892fe388435 354 case 0xA8: retval = 1; break;
bogdanm 15:4892fe388435 355 default : retval = 0; break;
bogdanm 15:4892fe388435 356 }
bogdanm 15:4892fe388435 357
bogdanm 15:4892fe388435 358 return(retval);
bogdanm 15:4892fe388435 359 }
bogdanm 15:4892fe388435 360
bogdanm 15:4892fe388435 361 int i2c_slave_read(i2c_t *obj, char *data, int length) {
bogdanm 15:4892fe388435 362 int count = 0;
bogdanm 15:4892fe388435 363 int status;
bogdanm 15:4892fe388435 364
bogdanm 15:4892fe388435 365 do {
bogdanm 15:4892fe388435 366 i2c_clear_SI(obj);
bogdanm 15:4892fe388435 367 i2c_wait_SI(obj);
bogdanm 15:4892fe388435 368 status = i2c_status(obj);
bogdanm 15:4892fe388435 369 if((status == 0x80) || (status == 0x90)) {
bogdanm 15:4892fe388435 370 data[count] = I2C_DAT(obj) & 0xFF;
bogdanm 15:4892fe388435 371 }
bogdanm 15:4892fe388435 372 count++;
bogdanm 15:4892fe388435 373 } while (((status == 0x80) || (status == 0x90) ||
bogdanm 15:4892fe388435 374 (status == 0x060) || (status == 0x70)) && (count < length));
bogdanm 15:4892fe388435 375
bogdanm 15:4892fe388435 376 if(status != 0xA0) {
bogdanm 15:4892fe388435 377 i2c_stop(obj);
bogdanm 15:4892fe388435 378 }
bogdanm 15:4892fe388435 379
bogdanm 15:4892fe388435 380 i2c_clear_SI(obj);
bogdanm 15:4892fe388435 381
bogdanm 15:4892fe388435 382 return count;
bogdanm 15:4892fe388435 383 }
bogdanm 15:4892fe388435 384
bogdanm 15:4892fe388435 385 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
bogdanm 15:4892fe388435 386 int count = 0;
bogdanm 15:4892fe388435 387 int status;
bogdanm 15:4892fe388435 388
bogdanm 15:4892fe388435 389 if(length <= 0) {
bogdanm 15:4892fe388435 390 return(0);
bogdanm 15:4892fe388435 391 }
bogdanm 15:4892fe388435 392
bogdanm 15:4892fe388435 393 do {
bogdanm 15:4892fe388435 394 status = i2c_do_write(obj, data[count], 0);
bogdanm 15:4892fe388435 395 count++;
bogdanm 15:4892fe388435 396 } while ((count < length) && (status == 0xB8));
bogdanm 15:4892fe388435 397
bogdanm 15:4892fe388435 398 if((status != 0xC0) && (status != 0xC8)) {
bogdanm 15:4892fe388435 399 i2c_stop(obj);
bogdanm 15:4892fe388435 400 }
bogdanm 15:4892fe388435 401
bogdanm 15:4892fe388435 402 i2c_clear_SI(obj);
bogdanm 15:4892fe388435 403
bogdanm 15:4892fe388435 404 return(count);
bogdanm 15:4892fe388435 405 }
bogdanm 15:4892fe388435 406
bogdanm 15:4892fe388435 407 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
bogdanm 15:4892fe388435 408 uint32_t addr;
bogdanm 15:4892fe388435 409
bogdanm 15:4892fe388435 410 if ((idx >= 0) && (idx <= 3)) {
bogdanm 15:4892fe388435 411 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx];
bogdanm 15:4892fe388435 412 *((uint32_t *) addr) = address & 0xFF;
bogdanm 15:4892fe388435 413 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[1][idx];
bogdanm 15:4892fe388435 414 *((uint32_t *) addr) = mask & 0xFE;
bogdanm 15:4892fe388435 415 }
bogdanm 15:4892fe388435 416 }