Adam Kucybala / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_NXP/TARGET_LPC11U6X/i2c_api.c@186:2e805bf06ee4, 2014-05-12 (annotated)

Committer:
mbed_official
Date:
Mon May 12 10:15:06 2014 +0100
Revision:
186:2e805bf06ee4
Parent:
174:8bb9f3a33240 
Synchronized with git revision f41d1e8383b601b353319ce36d53b9b84fb476a3



Full URL: https://github.com/mbedmicro/mbed/commit/f41d1e8383b601b353319ce36d53b9b84fb476a3/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 174:8bb9f3a33240 1 /* mbed Microcontroller Library
mbed_official 174:8bb9f3a33240 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 174:8bb9f3a33240 3 *
mbed_official 174:8bb9f3a33240 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 174:8bb9f3a33240 5 * you may not use this file except in compliance with the License.
mbed_official 174:8bb9f3a33240 6 * You may obtain a copy of the License at
mbed_official 174:8bb9f3a33240 7 *
mbed_official 174:8bb9f3a33240 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 174:8bb9f3a33240 9 *
mbed_official 174:8bb9f3a33240 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 174:8bb9f3a33240 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 174:8bb9f3a33240 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 174:8bb9f3a33240 13 * See the License for the specific language governing permissions and
mbed_official 174:8bb9f3a33240 14 * limitations under the License.
mbed_official 174:8bb9f3a33240 15 */
mbed_official 174:8bb9f3a33240 16
mbed_official 174:8bb9f3a33240 17 #include "i2c_api.h"
mbed_official 174:8bb9f3a33240 18 #include "cmsis.h"
mbed_official 174:8bb9f3a33240 19 #include "pinmap.h"
mbed_official 174:8bb9f3a33240 20 #include "error.h"
mbed_official 174:8bb9f3a33240 21
mbed_official 174:8bb9f3a33240 22 #if DEVICE_I2C
mbed_official 174:8bb9f3a33240 23
mbed_official 174:8bb9f3a33240 24 static const PinMap PinMap_I2C_SDA[] = {
mbed_official 174:8bb9f3a33240 25 {P0_5 , I2C_0, 1},
mbed_official 174:8bb9f3a33240 26 {P1_3 , I2C_1, 3},
mbed_official 174:8bb9f3a33240 27 {P1_14, I2C_1, 1},
mbed_official 174:8bb9f3a33240 28 {P1_24, I2C_1, 2},
mbed_official 174:8bb9f3a33240 29 {NC , NC , 0}
mbed_official 174:8bb9f3a33240 30 };
mbed_official 174:8bb9f3a33240 31
mbed_official 174:8bb9f3a33240 32 static const PinMap PinMap_I2C_SCL[] = {
mbed_official 174:8bb9f3a33240 33 {P0_4 , I2C_0, 1},
mbed_official 174:8bb9f3a33240 34 {P0_7 , I2C_1, 3},
mbed_official 174:8bb9f3a33240 35 {P1_11, I2C_1, 1},
mbed_official 174:8bb9f3a33240 36 {P1_30, I2C_1, 1},
mbed_official 174:8bb9f3a33240 37 {NC , NC, 0}
mbed_official 174:8bb9f3a33240 38 };
mbed_official 174:8bb9f3a33240 39
mbed_official 174:8bb9f3a33240 40 #define I2C_CONSET(x) (x->i2c->CONSET)
mbed_official 174:8bb9f3a33240 41 #define I2C_CONCLR(x) (x->i2c->CONCLR)
mbed_official 174:8bb9f3a33240 42 #define I2C_STAT(x) (x->i2c->STAT)
mbed_official 174:8bb9f3a33240 43 #define I2C_DAT(x) (x->i2c->DAT)
mbed_official 174:8bb9f3a33240 44 #define I2C_SCLL(x, val) (x->i2c->SCLL = val)
mbed_official 174:8bb9f3a33240 45 #define I2C_SCLH(x, val) (x->i2c->SCLH = val)
mbed_official 174:8bb9f3a33240 46
mbed_official 174:8bb9f3a33240 47 static const uint32_t I2C_addr_offset[2][4] = {
mbed_official 186:2e805bf06ee4 48 {0x0C, 0x20, 0x24, 0x28}, // slave address offset
mbed_official 186:2e805bf06ee4 49 {0x30, 0x34, 0x38, 0x3C} // slave address mask offset
mbed_official 174:8bb9f3a33240 50 };
mbed_official 174:8bb9f3a33240 51
mbed_official 174:8bb9f3a33240 52 static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
mbed_official 174:8bb9f3a33240 53 I2C_CONCLR(obj) = (start << 5)
mbed_official 174:8bb9f3a33240 54 | (stop << 4)
mbed_official 174:8bb9f3a33240 55 | (interrupt << 3)
mbed_official 174:8bb9f3a33240 56 | (acknowledge << 2);
mbed_official 174:8bb9f3a33240 57 }
mbed_official 174:8bb9f3a33240 58
mbed_official 174:8bb9f3a33240 59 static inline void i2c_conset(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
mbed_official 174:8bb9f3a33240 60 I2C_CONSET(obj) = (start << 5)
mbed_official 174:8bb9f3a33240 61 | (stop << 4)
mbed_official 174:8bb9f3a33240 62 | (interrupt << 3)
mbed_official 174:8bb9f3a33240 63 | (acknowledge << 2);
mbed_official 174:8bb9f3a33240 64 }
mbed_official 174:8bb9f3a33240 65
mbed_official 174:8bb9f3a33240 66 // Clear the Serial Interrupt (SI)
mbed_official 174:8bb9f3a33240 67 static inline void i2c_clear_SI(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 68 i2c_conclr(obj, 0, 0, 1, 0);
mbed_official 174:8bb9f3a33240 69 }
mbed_official 174:8bb9f3a33240 70
mbed_official 174:8bb9f3a33240 71 static inline int i2c_status(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 72 return I2C_STAT(obj);
mbed_official 174:8bb9f3a33240 73 }
mbed_official 174:8bb9f3a33240 74
mbed_official 174:8bb9f3a33240 75 // Wait until the Serial Interrupt (SI) is set
mbed_official 174:8bb9f3a33240 76 static int i2c_wait_SI(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 77 volatile int timeout = 0;
mbed_official 174:8bb9f3a33240 78 while (!(I2C_CONSET(obj) & (1 << 3))) {
mbed_official 174:8bb9f3a33240 79 timeout++;
mbed_official 174:8bb9f3a33240 80 if (timeout > 100000) return -1;
mbed_official 174:8bb9f3a33240 81 }
mbed_official 174:8bb9f3a33240 82 return 0;
mbed_official 174:8bb9f3a33240 83 }
mbed_official 174:8bb9f3a33240 84
mbed_official 174:8bb9f3a33240 85 static inline void i2c_interface_enable(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 86 I2C_CONSET(obj) = 0x40;
mbed_official 174:8bb9f3a33240 87 }
mbed_official 174:8bb9f3a33240 88
mbed_official 174:8bb9f3a33240 89 static inline void i2c_power_enable(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 90 LPC_SYSCON->SYSAHBCLKCTRL |= ((1 << 5) | (1 << 25));
mbed_official 174:8bb9f3a33240 91 LPC_SYSCON->PRESETCTRL |= ((1 << 1) | (1 << 3));
mbed_official 174:8bb9f3a33240 92 }
mbed_official 174:8bb9f3a33240 93
mbed_official 174:8bb9f3a33240 94 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 174:8bb9f3a33240 95 // determine the SPI to use
mbed_official 174:8bb9f3a33240 96 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 174:8bb9f3a33240 97 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 174:8bb9f3a33240 98 obj->i2c = (LPC_I2C0_Type *)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 174:8bb9f3a33240 99
mbed_official 174:8bb9f3a33240 100 if ((int)obj->i2c == NC) {
mbed_official 174:8bb9f3a33240 101 error("I2C pin mapping failed");
mbed_official 174:8bb9f3a33240 102 }
mbed_official 174:8bb9f3a33240 103
mbed_official 174:8bb9f3a33240 104 // enable power
mbed_official 174:8bb9f3a33240 105 i2c_power_enable(obj);
mbed_official 174:8bb9f3a33240 106
mbed_official 174:8bb9f3a33240 107 // set default frequency at 100k
mbed_official 174:8bb9f3a33240 108 i2c_frequency(obj, 100000);
mbed_official 174:8bb9f3a33240 109 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 174:8bb9f3a33240 110 i2c_interface_enable(obj);
mbed_official 174:8bb9f3a33240 111
mbed_official 174:8bb9f3a33240 112 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 174:8bb9f3a33240 113 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 174:8bb9f3a33240 114 }
mbed_official 174:8bb9f3a33240 115
mbed_official 174:8bb9f3a33240 116 inline int i2c_start(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 117 int status = 0;
mbed_official 174:8bb9f3a33240 118 // 8.1 Before master mode can be entered, I2CON must be initialised to:
mbed_official 174:8bb9f3a33240 119 // - I2EN STA STO SI AA - -
mbed_official 174:8bb9f3a33240 120 // - 1 0 0 0 x - -
mbed_official 174:8bb9f3a33240 121 // if AA = 0, it can't enter slave mode
mbed_official 174:8bb9f3a33240 122 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 174:8bb9f3a33240 123
mbed_official 174:8bb9f3a33240 124 // The master mode may now be entered by setting the STA bit
mbed_official 174:8bb9f3a33240 125 // this will generate a start condition when the bus becomes free
mbed_official 174:8bb9f3a33240 126 i2c_conset(obj, 1, 0, 0, 1);
mbed_official 174:8bb9f3a33240 127
mbed_official 174:8bb9f3a33240 128 i2c_wait_SI(obj);
mbed_official 174:8bb9f3a33240 129 status = i2c_status(obj);
mbed_official 174:8bb9f3a33240 130
mbed_official 174:8bb9f3a33240 131 // Clear start bit now transmitted, and interrupt bit
mbed_official 174:8bb9f3a33240 132 i2c_conclr(obj, 1, 0, 0, 0);
mbed_official 174:8bb9f3a33240 133 return status;
mbed_official 174:8bb9f3a33240 134 }
mbed_official 174:8bb9f3a33240 135
mbed_official 174:8bb9f3a33240 136 inline int i2c_stop(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 137 int timeout = 0;
mbed_official 174:8bb9f3a33240 138
mbed_official 174:8bb9f3a33240 139 // write the stop bit
mbed_official 174:8bb9f3a33240 140 i2c_conset(obj, 0, 1, 0, 0);
mbed_official 174:8bb9f3a33240 141 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 142
mbed_official 174:8bb9f3a33240 143 // wait for STO bit to reset
mbed_official 174:8bb9f3a33240 144 while(I2C_CONSET(obj) & (1 << 4)) {
mbed_official 174:8bb9f3a33240 145 timeout ++;
mbed_official 174:8bb9f3a33240 146 if (timeout > 100000) return 1;
mbed_official 174:8bb9f3a33240 147 }
mbed_official 174:8bb9f3a33240 148
mbed_official 174:8bb9f3a33240 149 return 0;
mbed_official 174:8bb9f3a33240 150 }
mbed_official 174:8bb9f3a33240 151
mbed_official 174:8bb9f3a33240 152
mbed_official 174:8bb9f3a33240 153 static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) {
mbed_official 174:8bb9f3a33240 154 // write the data
mbed_official 174:8bb9f3a33240 155 I2C_DAT(obj) = value;
mbed_official 174:8bb9f3a33240 156
mbed_official 174:8bb9f3a33240 157 // clear SI to init a send
mbed_official 174:8bb9f3a33240 158 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 159
mbed_official 174:8bb9f3a33240 160 // wait and return status
mbed_official 174:8bb9f3a33240 161 i2c_wait_SI(obj);
mbed_official 174:8bb9f3a33240 162 return i2c_status(obj);
mbed_official 174:8bb9f3a33240 163 }
mbed_official 174:8bb9f3a33240 164
mbed_official 174:8bb9f3a33240 165 static inline int i2c_do_read(i2c_t *obj, int last) {
mbed_official 174:8bb9f3a33240 166 // we are in state 0x40 (SLA+R tx'd) or 0x50 (data rx'd and ack)
mbed_official 174:8bb9f3a33240 167 if (last) {
mbed_official 174:8bb9f3a33240 168 i2c_conclr(obj, 0, 0, 0, 1); // send a NOT ACK
mbed_official 174:8bb9f3a33240 169 } else {
mbed_official 174:8bb9f3a33240 170 i2c_conset(obj, 0, 0, 0, 1); // send a ACK
mbed_official 174:8bb9f3a33240 171 }
mbed_official 174:8bb9f3a33240 172
mbed_official 174:8bb9f3a33240 173 // accept byte
mbed_official 174:8bb9f3a33240 174 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 175
mbed_official 174:8bb9f3a33240 176 // wait for it to arrive
mbed_official 174:8bb9f3a33240 177 i2c_wait_SI(obj);
mbed_official 174:8bb9f3a33240 178
mbed_official 174:8bb9f3a33240 179 // return the data
mbed_official 174:8bb9f3a33240 180 return (I2C_DAT(obj) & 0xFF);
mbed_official 174:8bb9f3a33240 181 }
mbed_official 174:8bb9f3a33240 182
mbed_official 174:8bb9f3a33240 183 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 174:8bb9f3a33240 184 // No peripheral clock divider on the M0
mbed_official 186:2e805bf06ee4 185 uint32_t PCLK = SystemCoreClock;
mbed_official 174:8bb9f3a33240 186
mbed_official 174:8bb9f3a33240 187 uint32_t pulse = PCLK / (hz * 2);
mbed_official 174:8bb9f3a33240 188
mbed_official 174:8bb9f3a33240 189 // I2C Rate
mbed_official 174:8bb9f3a33240 190 I2C_SCLL(obj, pulse);
mbed_official 174:8bb9f3a33240 191 I2C_SCLH(obj, pulse);
mbed_official 174:8bb9f3a33240 192 }
mbed_official 174:8bb9f3a33240 193
mbed_official 174:8bb9f3a33240 194 // The I2C does a read or a write as a whole operation
mbed_official 174:8bb9f3a33240 195 // There are two types of error conditions it can encounter
mbed_official 174:8bb9f3a33240 196 // 1) it can not obtain the bus
mbed_official 174:8bb9f3a33240 197 // 2) it gets error responses at part of the transmission
mbed_official 174:8bb9f3a33240 198 //
mbed_official 174:8bb9f3a33240 199 // We tackle them as follows:
mbed_official 174:8bb9f3a33240 200 // 1) we retry until we get the bus. we could have a "timeout" if we can not get it
mbed_official 174:8bb9f3a33240 201 // which basically turns it in to a 2)
mbed_official 174:8bb9f3a33240 202 // 2) on error, we use the standard error mechanisms to report/debug
mbed_official 174:8bb9f3a33240 203 //
mbed_official 174:8bb9f3a33240 204 // Therefore an I2C transaction should always complete. If it doesn't it is usually
mbed_official 174:8bb9f3a33240 205 // because something is setup wrong (e.g. wiring), and we don't need to programatically
mbed_official 174:8bb9f3a33240 206 // check for that
mbed_official 174:8bb9f3a33240 207
mbed_official 174:8bb9f3a33240 208 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 174:8bb9f3a33240 209 int count, status;
mbed_official 174:8bb9f3a33240 210
mbed_official 174:8bb9f3a33240 211 status = i2c_start(obj);
mbed_official 174:8bb9f3a33240 212
mbed_official 174:8bb9f3a33240 213 if ((status != 0x10) && (status != 0x08)) {
mbed_official 174:8bb9f3a33240 214 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 215 return I2C_ERROR_BUS_BUSY;
mbed_official 174:8bb9f3a33240 216 }
mbed_official 174:8bb9f3a33240 217
mbed_official 174:8bb9f3a33240 218 status = i2c_do_write(obj, (address | 0x01), 1);
mbed_official 174:8bb9f3a33240 219 if (status != 0x40) {
mbed_official 174:8bb9f3a33240 220 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 221 return I2C_ERROR_NO_SLAVE;
mbed_official 174:8bb9f3a33240 222 }
mbed_official 174:8bb9f3a33240 223
mbed_official 174:8bb9f3a33240 224 // Read in all except last byte
mbed_official 174:8bb9f3a33240 225 for (count = 0; count < (length - 1); count++) {
mbed_official 174:8bb9f3a33240 226 int value = i2c_do_read(obj, 0);
mbed_official 174:8bb9f3a33240 227 status = i2c_status(obj);
mbed_official 174:8bb9f3a33240 228 if (status != 0x50) {
mbed_official 174:8bb9f3a33240 229 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 230 return count;
mbed_official 174:8bb9f3a33240 231 }
mbed_official 174:8bb9f3a33240 232 data[count] = (char) value;
mbed_official 174:8bb9f3a33240 233 }
mbed_official 174:8bb9f3a33240 234
mbed_official 174:8bb9f3a33240 235 // read in last byte
mbed_official 174:8bb9f3a33240 236 int value = i2c_do_read(obj, 1);
mbed_official 174:8bb9f3a33240 237 status = i2c_status(obj);
mbed_official 174:8bb9f3a33240 238 if (status != 0x58) {
mbed_official 174:8bb9f3a33240 239 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 240 return length - 1;
mbed_official 174:8bb9f3a33240 241 }
mbed_official 174:8bb9f3a33240 242
mbed_official 174:8bb9f3a33240 243 data[count] = (char) value;
mbed_official 174:8bb9f3a33240 244
mbed_official 174:8bb9f3a33240 245 // If not repeated start, send stop.
mbed_official 174:8bb9f3a33240 246 if (stop) {
mbed_official 174:8bb9f3a33240 247 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 248 }
mbed_official 174:8bb9f3a33240 249
mbed_official 174:8bb9f3a33240 250 return length;
mbed_official 174:8bb9f3a33240 251 }
mbed_official 174:8bb9f3a33240 252
mbed_official 174:8bb9f3a33240 253 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 174:8bb9f3a33240 254 int i, status;
mbed_official 174:8bb9f3a33240 255
mbed_official 174:8bb9f3a33240 256 status = i2c_start(obj);
mbed_official 174:8bb9f3a33240 257
mbed_official 174:8bb9f3a33240 258 if ((status != 0x10) && (status != 0x08)) {
mbed_official 174:8bb9f3a33240 259 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 260 return I2C_ERROR_BUS_BUSY;
mbed_official 174:8bb9f3a33240 261 }
mbed_official 174:8bb9f3a33240 262
mbed_official 174:8bb9f3a33240 263 status = i2c_do_write(obj, (address & 0xFE), 1);
mbed_official 174:8bb9f3a33240 264 if (status != 0x18) {
mbed_official 174:8bb9f3a33240 265 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 266 return I2C_ERROR_NO_SLAVE;
mbed_official 174:8bb9f3a33240 267 }
mbed_official 174:8bb9f3a33240 268
mbed_official 174:8bb9f3a33240 269 for (i=0; i<length; i++) {
mbed_official 174:8bb9f3a33240 270 status = i2c_do_write(obj, data[i], 0);
mbed_official 174:8bb9f3a33240 271 if(status != 0x28) {
mbed_official 174:8bb9f3a33240 272 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 273 return i;
mbed_official 174:8bb9f3a33240 274 }
mbed_official 174:8bb9f3a33240 275 }
mbed_official 174:8bb9f3a33240 276
mbed_official 174:8bb9f3a33240 277 // clearing the serial interrupt here might cause an unintended rewrite of the last byte
mbed_official 174:8bb9f3a33240 278 // see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1
mbed_official 174:8bb9f3a33240 279 // i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 280
mbed_official 174:8bb9f3a33240 281 // If not repeated start, send stop.
mbed_official 174:8bb9f3a33240 282 if (stop) {
mbed_official 174:8bb9f3a33240 283 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 284 }
mbed_official 174:8bb9f3a33240 285
mbed_official 174:8bb9f3a33240 286 return length;
mbed_official 174:8bb9f3a33240 287 }
mbed_official 174:8bb9f3a33240 288
mbed_official 174:8bb9f3a33240 289 void i2c_reset(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 290 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 291 }
mbed_official 174:8bb9f3a33240 292
mbed_official 174:8bb9f3a33240 293 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 174:8bb9f3a33240 294 return (i2c_do_read(obj, last) & 0xFF);
mbed_official 174:8bb9f3a33240 295 }
mbed_official 174:8bb9f3a33240 296
mbed_official 174:8bb9f3a33240 297 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 174:8bb9f3a33240 298 int ack;
mbed_official 174:8bb9f3a33240 299 int status = i2c_do_write(obj, (data & 0xFF), 0);
mbed_official 174:8bb9f3a33240 300
mbed_official 174:8bb9f3a33240 301 switch(status) {
mbed_official 174:8bb9f3a33240 302 case 0x18: case 0x28: // Master transmit ACKs
mbed_official 174:8bb9f3a33240 303 ack = 1;
mbed_official 174:8bb9f3a33240 304 break;
mbed_official 174:8bb9f3a33240 305 case 0x40: // Master receive address transmitted ACK
mbed_official 174:8bb9f3a33240 306 ack = 1;
mbed_official 174:8bb9f3a33240 307 break;
mbed_official 174:8bb9f3a33240 308 case 0xB8: // Slave transmit ACK
mbed_official 174:8bb9f3a33240 309 ack = 1;
mbed_official 174:8bb9f3a33240 310 break;
mbed_official 174:8bb9f3a33240 311 default:
mbed_official 174:8bb9f3a33240 312 ack = 0;
mbed_official 174:8bb9f3a33240 313 break;
mbed_official 174:8bb9f3a33240 314 }
mbed_official 174:8bb9f3a33240 315
mbed_official 174:8bb9f3a33240 316 return ack;
mbed_official 174:8bb9f3a33240 317 }
mbed_official 174:8bb9f3a33240 318
mbed_official 174:8bb9f3a33240 319 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 174:8bb9f3a33240 320 if (enable_slave != 0) {
mbed_official 174:8bb9f3a33240 321 i2c_conclr(obj, 1, 1, 1, 0);
mbed_official 174:8bb9f3a33240 322 i2c_conset(obj, 0, 0, 0, 1);
mbed_official 174:8bb9f3a33240 323 } else {
mbed_official 174:8bb9f3a33240 324 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 174:8bb9f3a33240 325 }
mbed_official 174:8bb9f3a33240 326 }
mbed_official 174:8bb9f3a33240 327
mbed_official 174:8bb9f3a33240 328 int i2c_slave_receive(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 329 int status;
mbed_official 174:8bb9f3a33240 330 int retval;
mbed_official 174:8bb9f3a33240 331
mbed_official 174:8bb9f3a33240 332 status = i2c_status(obj);
mbed_official 174:8bb9f3a33240 333 switch(status) {
mbed_official 174:8bb9f3a33240 334 case 0x60: retval = 3; break;
mbed_official 174:8bb9f3a33240 335 case 0x70: retval = 2; break;
mbed_official 174:8bb9f3a33240 336 case 0xA8: retval = 1; break;
mbed_official 174:8bb9f3a33240 337 default : retval = 0; break;
mbed_official 174:8bb9f3a33240 338 }
mbed_official 174:8bb9f3a33240 339
mbed_official 174:8bb9f3a33240 340 return(retval);
mbed_official 174:8bb9f3a33240 341 }
mbed_official 174:8bb9f3a33240 342
mbed_official 174:8bb9f3a33240 343 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 174:8bb9f3a33240 344 int count = 0;
mbed_official 174:8bb9f3a33240 345 int status;
mbed_official 174:8bb9f3a33240 346
mbed_official 174:8bb9f3a33240 347 do {
mbed_official 174:8bb9f3a33240 348 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 349 i2c_wait_SI(obj);
mbed_official 174:8bb9f3a33240 350 status = i2c_status(obj);
mbed_official 174:8bb9f3a33240 351 if((status == 0x80) || (status == 0x90)) {
mbed_official 174:8bb9f3a33240 352 data[count] = I2C_DAT(obj) & 0xFF;
mbed_official 174:8bb9f3a33240 353 }
mbed_official 174:8bb9f3a33240 354 count++;
mbed_official 174:8bb9f3a33240 355 } while (((status == 0x80) || (status == 0x90) ||
mbed_official 174:8bb9f3a33240 356 (status == 0x060) || (status == 0x70)) && (count < length));
mbed_official 174:8bb9f3a33240 357
mbed_official 174:8bb9f3a33240 358 if(status != 0xA0) {
mbed_official 174:8bb9f3a33240 359 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 360 }
mbed_official 174:8bb9f3a33240 361
mbed_official 174:8bb9f3a33240 362 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 363
mbed_official 174:8bb9f3a33240 364 return count;
mbed_official 174:8bb9f3a33240 365 }
mbed_official 174:8bb9f3a33240 366
mbed_official 174:8bb9f3a33240 367 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 174:8bb9f3a33240 368 int count = 0;
mbed_official 174:8bb9f3a33240 369 int status;
mbed_official 174:8bb9f3a33240 370
mbed_official 174:8bb9f3a33240 371 if(length <= 0) {
mbed_official 174:8bb9f3a33240 372 return(0);
mbed_official 174:8bb9f3a33240 373 }
mbed_official 174:8bb9f3a33240 374
mbed_official 174:8bb9f3a33240 375 do {
mbed_official 174:8bb9f3a33240 376 status = i2c_do_write(obj, data[count], 0);
mbed_official 174:8bb9f3a33240 377 count++;
mbed_official 174:8bb9f3a33240 378 } while ((count < length) && (status == 0xB8));
mbed_official 174:8bb9f3a33240 379
mbed_official 174:8bb9f3a33240 380 if((status != 0xC0) && (status != 0xC8)) {
mbed_official 174:8bb9f3a33240 381 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 382 }
mbed_official 174:8bb9f3a33240 383
mbed_official 174:8bb9f3a33240 384 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 385
mbed_official 174:8bb9f3a33240 386 return(count);
mbed_official 174:8bb9f3a33240 387 }
mbed_official 174:8bb9f3a33240 388
mbed_official 174:8bb9f3a33240 389 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 174:8bb9f3a33240 390 uint32_t addr;
mbed_official 174:8bb9f3a33240 391
mbed_official 174:8bb9f3a33240 392 if ((idx >= 0) && (idx <= 3)) {
mbed_official 174:8bb9f3a33240 393 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx];
mbed_official 174:8bb9f3a33240 394 *((uint32_t *) addr) = address & 0xFF;
mbed_official 174:8bb9f3a33240 395 }
mbed_official 174:8bb9f3a33240 396 }
mbed_official 174:8bb9f3a33240 397
mbed_official 174:8bb9f3a33240 398 #endif