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_LPC11U6X/i2c_api.c@174:8bb9f3a33240, 2014-04-29 (annotated)

Committer:
mbed_official
Date:
Tue Apr 29 11:15:07 2014 +0100
Revision:
174:8bb9f3a33240
Child:
186:2e805bf06ee4
Synchronized with git revision 5bf985ebc651a2c31cefabd9d62c51dc465ef60a



Full URL: https://github.com/mbedmicro/mbed/commit/5bf985ebc651a2c31cefabd9d62c51dc465ef60a/



[NUCLEO_L152RE/F103RB] Add LSE configuration for RTC

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 #warning [TODO] just copied from LPC11UXX code, need to check
mbed_official 174:8bb9f3a33240 48 static const uint32_t I2C_addr_offset[2][4] = {
mbed_official 174:8bb9f3a33240 49 {0x0C, 0x20, 0x24, 0x28},
mbed_official 174:8bb9f3a33240 50 {0x30, 0x34, 0x38, 0x3C}
mbed_official 174:8bb9f3a33240 51 };
mbed_official 174:8bb9f3a33240 52
mbed_official 174:8bb9f3a33240 53 static inline void i2c_conclr(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
mbed_official 174:8bb9f3a33240 54 I2C_CONCLR(obj) = (start << 5)
mbed_official 174:8bb9f3a33240 55 | (stop << 4)
mbed_official 174:8bb9f3a33240 56 | (interrupt << 3)
mbed_official 174:8bb9f3a33240 57 | (acknowledge << 2);
mbed_official 174:8bb9f3a33240 58 }
mbed_official 174:8bb9f3a33240 59
mbed_official 174:8bb9f3a33240 60 static inline void i2c_conset(i2c_t *obj, int start, int stop, int interrupt, int acknowledge) {
mbed_official 174:8bb9f3a33240 61 I2C_CONSET(obj) = (start << 5)
mbed_official 174:8bb9f3a33240 62 | (stop << 4)
mbed_official 174:8bb9f3a33240 63 | (interrupt << 3)
mbed_official 174:8bb9f3a33240 64 | (acknowledge << 2);
mbed_official 174:8bb9f3a33240 65 }
mbed_official 174:8bb9f3a33240 66
mbed_official 174:8bb9f3a33240 67 // Clear the Serial Interrupt (SI)
mbed_official 174:8bb9f3a33240 68 static inline void i2c_clear_SI(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 69 i2c_conclr(obj, 0, 0, 1, 0);
mbed_official 174:8bb9f3a33240 70 }
mbed_official 174:8bb9f3a33240 71
mbed_official 174:8bb9f3a33240 72 static inline int i2c_status(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 73 return I2C_STAT(obj);
mbed_official 174:8bb9f3a33240 74 }
mbed_official 174:8bb9f3a33240 75
mbed_official 174:8bb9f3a33240 76 // Wait until the Serial Interrupt (SI) is set
mbed_official 174:8bb9f3a33240 77 static int i2c_wait_SI(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 78 volatile int timeout = 0;
mbed_official 174:8bb9f3a33240 79 while (!(I2C_CONSET(obj) & (1 << 3))) {
mbed_official 174:8bb9f3a33240 80 timeout++;
mbed_official 174:8bb9f3a33240 81 if (timeout > 100000) return -1;
mbed_official 174:8bb9f3a33240 82 }
mbed_official 174:8bb9f3a33240 83 return 0;
mbed_official 174:8bb9f3a33240 84 }
mbed_official 174:8bb9f3a33240 85
mbed_official 174:8bb9f3a33240 86 static inline void i2c_interface_enable(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 87 I2C_CONSET(obj) = 0x40;
mbed_official 174:8bb9f3a33240 88 }
mbed_official 174:8bb9f3a33240 89
mbed_official 174:8bb9f3a33240 90 static inline void i2c_power_enable(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 91 LPC_SYSCON->SYSAHBCLKCTRL |= ((1 << 5) | (1 << 25));
mbed_official 174:8bb9f3a33240 92 LPC_SYSCON->PRESETCTRL |= ((1 << 1) | (1 << 3));
mbed_official 174:8bb9f3a33240 93 }
mbed_official 174:8bb9f3a33240 94
mbed_official 174:8bb9f3a33240 95 void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
mbed_official 174:8bb9f3a33240 96 // determine the SPI to use
mbed_official 174:8bb9f3a33240 97 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
mbed_official 174:8bb9f3a33240 98 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
mbed_official 174:8bb9f3a33240 99 obj->i2c = (LPC_I2C0_Type *)pinmap_merge(i2c_sda, i2c_scl);
mbed_official 174:8bb9f3a33240 100
mbed_official 174:8bb9f3a33240 101 if ((int)obj->i2c == NC) {
mbed_official 174:8bb9f3a33240 102 error("I2C pin mapping failed");
mbed_official 174:8bb9f3a33240 103 }
mbed_official 174:8bb9f3a33240 104
mbed_official 174:8bb9f3a33240 105 // enable power
mbed_official 174:8bb9f3a33240 106 i2c_power_enable(obj);
mbed_official 174:8bb9f3a33240 107
mbed_official 174:8bb9f3a33240 108 // set default frequency at 100k
mbed_official 174:8bb9f3a33240 109 i2c_frequency(obj, 100000);
mbed_official 174:8bb9f3a33240 110 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 174:8bb9f3a33240 111 i2c_interface_enable(obj);
mbed_official 174:8bb9f3a33240 112
mbed_official 174:8bb9f3a33240 113 pinmap_pinout(sda, PinMap_I2C_SDA);
mbed_official 174:8bb9f3a33240 114 pinmap_pinout(scl, PinMap_I2C_SCL);
mbed_official 174:8bb9f3a33240 115 }
mbed_official 174:8bb9f3a33240 116
mbed_official 174:8bb9f3a33240 117 inline int i2c_start(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 118 int status = 0;
mbed_official 174:8bb9f3a33240 119 // 8.1 Before master mode can be entered, I2CON must be initialised to:
mbed_official 174:8bb9f3a33240 120 // - I2EN STA STO SI AA - -
mbed_official 174:8bb9f3a33240 121 // - 1 0 0 0 x - -
mbed_official 174:8bb9f3a33240 122 // if AA = 0, it can't enter slave mode
mbed_official 174:8bb9f3a33240 123 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 174:8bb9f3a33240 124
mbed_official 174:8bb9f3a33240 125 // The master mode may now be entered by setting the STA bit
mbed_official 174:8bb9f3a33240 126 // this will generate a start condition when the bus becomes free
mbed_official 174:8bb9f3a33240 127 i2c_conset(obj, 1, 0, 0, 1);
mbed_official 174:8bb9f3a33240 128
mbed_official 174:8bb9f3a33240 129 i2c_wait_SI(obj);
mbed_official 174:8bb9f3a33240 130 status = i2c_status(obj);
mbed_official 174:8bb9f3a33240 131
mbed_official 174:8bb9f3a33240 132 // Clear start bit now transmitted, and interrupt bit
mbed_official 174:8bb9f3a33240 133 i2c_conclr(obj, 1, 0, 0, 0);
mbed_official 174:8bb9f3a33240 134 return status;
mbed_official 174:8bb9f3a33240 135 }
mbed_official 174:8bb9f3a33240 136
mbed_official 174:8bb9f3a33240 137 inline int i2c_stop(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 138 int timeout = 0;
mbed_official 174:8bb9f3a33240 139
mbed_official 174:8bb9f3a33240 140 // write the stop bit
mbed_official 174:8bb9f3a33240 141 i2c_conset(obj, 0, 1, 0, 0);
mbed_official 174:8bb9f3a33240 142 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 143
mbed_official 174:8bb9f3a33240 144 // wait for STO bit to reset
mbed_official 174:8bb9f3a33240 145 while(I2C_CONSET(obj) & (1 << 4)) {
mbed_official 174:8bb9f3a33240 146 timeout ++;
mbed_official 174:8bb9f3a33240 147 if (timeout > 100000) return 1;
mbed_official 174:8bb9f3a33240 148 }
mbed_official 174:8bb9f3a33240 149
mbed_official 174:8bb9f3a33240 150 return 0;
mbed_official 174:8bb9f3a33240 151 }
mbed_official 174:8bb9f3a33240 152
mbed_official 174:8bb9f3a33240 153
mbed_official 174:8bb9f3a33240 154 static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) {
mbed_official 174:8bb9f3a33240 155 // write the data
mbed_official 174:8bb9f3a33240 156 I2C_DAT(obj) = value;
mbed_official 174:8bb9f3a33240 157
mbed_official 174:8bb9f3a33240 158 // clear SI to init a send
mbed_official 174:8bb9f3a33240 159 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 160
mbed_official 174:8bb9f3a33240 161 // wait and return status
mbed_official 174:8bb9f3a33240 162 i2c_wait_SI(obj);
mbed_official 174:8bb9f3a33240 163 return i2c_status(obj);
mbed_official 174:8bb9f3a33240 164 }
mbed_official 174:8bb9f3a33240 165
mbed_official 174:8bb9f3a33240 166 static inline int i2c_do_read(i2c_t *obj, int last) {
mbed_official 174:8bb9f3a33240 167 // we are in state 0x40 (SLA+R tx'd) or 0x50 (data rx'd and ack)
mbed_official 174:8bb9f3a33240 168 if (last) {
mbed_official 174:8bb9f3a33240 169 i2c_conclr(obj, 0, 0, 0, 1); // send a NOT ACK
mbed_official 174:8bb9f3a33240 170 } else {
mbed_official 174:8bb9f3a33240 171 i2c_conset(obj, 0, 0, 0, 1); // send a ACK
mbed_official 174:8bb9f3a33240 172 }
mbed_official 174:8bb9f3a33240 173
mbed_official 174:8bb9f3a33240 174 // accept byte
mbed_official 174:8bb9f3a33240 175 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 176
mbed_official 174:8bb9f3a33240 177 // wait for it to arrive
mbed_official 174:8bb9f3a33240 178 i2c_wait_SI(obj);
mbed_official 174:8bb9f3a33240 179
mbed_official 174:8bb9f3a33240 180 // return the data
mbed_official 174:8bb9f3a33240 181 return (I2C_DAT(obj) & 0xFF);
mbed_official 174:8bb9f3a33240 182 }
mbed_official 174:8bb9f3a33240 183
mbed_official 174:8bb9f3a33240 184 void i2c_frequency(i2c_t *obj, int hz) {
mbed_official 174:8bb9f3a33240 185 // No peripheral clock divider on the M0
mbed_official 174:8bb9f3a33240 186 #warning "[TODO] This should be fixed to handle system core clock correctly."
mbed_official 174:8bb9f3a33240 187 uint32_t PCLK = 12000000; //SystemCoreClock;
mbed_official 174:8bb9f3a33240 188
mbed_official 174:8bb9f3a33240 189 uint32_t pulse = PCLK / (hz * 2);
mbed_official 174:8bb9f3a33240 190
mbed_official 174:8bb9f3a33240 191 // I2C Rate
mbed_official 174:8bb9f3a33240 192 I2C_SCLL(obj, pulse);
mbed_official 174:8bb9f3a33240 193 I2C_SCLH(obj, pulse);
mbed_official 174:8bb9f3a33240 194 }
mbed_official 174:8bb9f3a33240 195
mbed_official 174:8bb9f3a33240 196 // The I2C does a read or a write as a whole operation
mbed_official 174:8bb9f3a33240 197 // There are two types of error conditions it can encounter
mbed_official 174:8bb9f3a33240 198 // 1) it can not obtain the bus
mbed_official 174:8bb9f3a33240 199 // 2) it gets error responses at part of the transmission
mbed_official 174:8bb9f3a33240 200 //
mbed_official 174:8bb9f3a33240 201 // We tackle them as follows:
mbed_official 174:8bb9f3a33240 202 // 1) we retry until we get the bus. we could have a "timeout" if we can not get it
mbed_official 174:8bb9f3a33240 203 // which basically turns it in to a 2)
mbed_official 174:8bb9f3a33240 204 // 2) on error, we use the standard error mechanisms to report/debug
mbed_official 174:8bb9f3a33240 205 //
mbed_official 174:8bb9f3a33240 206 // Therefore an I2C transaction should always complete. If it doesn't it is usually
mbed_official 174:8bb9f3a33240 207 // because something is setup wrong (e.g. wiring), and we don't need to programatically
mbed_official 174:8bb9f3a33240 208 // check for that
mbed_official 174:8bb9f3a33240 209
mbed_official 174:8bb9f3a33240 210 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
mbed_official 174:8bb9f3a33240 211 int count, status;
mbed_official 174:8bb9f3a33240 212
mbed_official 174:8bb9f3a33240 213 status = i2c_start(obj);
mbed_official 174:8bb9f3a33240 214
mbed_official 174:8bb9f3a33240 215 if ((status != 0x10) && (status != 0x08)) {
mbed_official 174:8bb9f3a33240 216 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 217 return I2C_ERROR_BUS_BUSY;
mbed_official 174:8bb9f3a33240 218 }
mbed_official 174:8bb9f3a33240 219
mbed_official 174:8bb9f3a33240 220 status = i2c_do_write(obj, (address | 0x01), 1);
mbed_official 174:8bb9f3a33240 221 if (status != 0x40) {
mbed_official 174:8bb9f3a33240 222 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 223 return I2C_ERROR_NO_SLAVE;
mbed_official 174:8bb9f3a33240 224 }
mbed_official 174:8bb9f3a33240 225
mbed_official 174:8bb9f3a33240 226 // Read in all except last byte
mbed_official 174:8bb9f3a33240 227 for (count = 0; count < (length - 1); count++) {
mbed_official 174:8bb9f3a33240 228 int value = i2c_do_read(obj, 0);
mbed_official 174:8bb9f3a33240 229 status = i2c_status(obj);
mbed_official 174:8bb9f3a33240 230 if (status != 0x50) {
mbed_official 174:8bb9f3a33240 231 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 232 return count;
mbed_official 174:8bb9f3a33240 233 }
mbed_official 174:8bb9f3a33240 234 data[count] = (char) value;
mbed_official 174:8bb9f3a33240 235 }
mbed_official 174:8bb9f3a33240 236
mbed_official 174:8bb9f3a33240 237 // read in last byte
mbed_official 174:8bb9f3a33240 238 int value = i2c_do_read(obj, 1);
mbed_official 174:8bb9f3a33240 239 status = i2c_status(obj);
mbed_official 174:8bb9f3a33240 240 if (status != 0x58) {
mbed_official 174:8bb9f3a33240 241 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 242 return length - 1;
mbed_official 174:8bb9f3a33240 243 }
mbed_official 174:8bb9f3a33240 244
mbed_official 174:8bb9f3a33240 245 data[count] = (char) value;
mbed_official 174:8bb9f3a33240 246
mbed_official 174:8bb9f3a33240 247 // If not repeated start, send stop.
mbed_official 174:8bb9f3a33240 248 if (stop) {
mbed_official 174:8bb9f3a33240 249 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 250 }
mbed_official 174:8bb9f3a33240 251
mbed_official 174:8bb9f3a33240 252 return length;
mbed_official 174:8bb9f3a33240 253 }
mbed_official 174:8bb9f3a33240 254
mbed_official 174:8bb9f3a33240 255 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
mbed_official 174:8bb9f3a33240 256 int i, status;
mbed_official 174:8bb9f3a33240 257
mbed_official 174:8bb9f3a33240 258 status = i2c_start(obj);
mbed_official 174:8bb9f3a33240 259
mbed_official 174:8bb9f3a33240 260 if ((status != 0x10) && (status != 0x08)) {
mbed_official 174:8bb9f3a33240 261 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 262 return I2C_ERROR_BUS_BUSY;
mbed_official 174:8bb9f3a33240 263 }
mbed_official 174:8bb9f3a33240 264
mbed_official 174:8bb9f3a33240 265 status = i2c_do_write(obj, (address & 0xFE), 1);
mbed_official 174:8bb9f3a33240 266 if (status != 0x18) {
mbed_official 174:8bb9f3a33240 267 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 268 return I2C_ERROR_NO_SLAVE;
mbed_official 174:8bb9f3a33240 269 }
mbed_official 174:8bb9f3a33240 270
mbed_official 174:8bb9f3a33240 271 for (i=0; i<length; i++) {
mbed_official 174:8bb9f3a33240 272 status = i2c_do_write(obj, data[i], 0);
mbed_official 174:8bb9f3a33240 273 if(status != 0x28) {
mbed_official 174:8bb9f3a33240 274 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 275 return i;
mbed_official 174:8bb9f3a33240 276 }
mbed_official 174:8bb9f3a33240 277 }
mbed_official 174:8bb9f3a33240 278
mbed_official 174:8bb9f3a33240 279 // clearing the serial interrupt here might cause an unintended rewrite of the last byte
mbed_official 174:8bb9f3a33240 280 // see also issue report https://mbed.org/users/mbed_official/code/mbed/issues/1
mbed_official 174:8bb9f3a33240 281 // i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 282
mbed_official 174:8bb9f3a33240 283 // If not repeated start, send stop.
mbed_official 174:8bb9f3a33240 284 if (stop) {
mbed_official 174:8bb9f3a33240 285 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 286 }
mbed_official 174:8bb9f3a33240 287
mbed_official 174:8bb9f3a33240 288 return length;
mbed_official 174:8bb9f3a33240 289 }
mbed_official 174:8bb9f3a33240 290
mbed_official 174:8bb9f3a33240 291 void i2c_reset(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 292 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 293 }
mbed_official 174:8bb9f3a33240 294
mbed_official 174:8bb9f3a33240 295 int i2c_byte_read(i2c_t *obj, int last) {
mbed_official 174:8bb9f3a33240 296 return (i2c_do_read(obj, last) & 0xFF);
mbed_official 174:8bb9f3a33240 297 }
mbed_official 174:8bb9f3a33240 298
mbed_official 174:8bb9f3a33240 299 int i2c_byte_write(i2c_t *obj, int data) {
mbed_official 174:8bb9f3a33240 300 int ack;
mbed_official 174:8bb9f3a33240 301 int status = i2c_do_write(obj, (data & 0xFF), 0);
mbed_official 174:8bb9f3a33240 302
mbed_official 174:8bb9f3a33240 303 switch(status) {
mbed_official 174:8bb9f3a33240 304 case 0x18: case 0x28: // Master transmit ACKs
mbed_official 174:8bb9f3a33240 305 ack = 1;
mbed_official 174:8bb9f3a33240 306 break;
mbed_official 174:8bb9f3a33240 307 case 0x40: // Master receive address transmitted ACK
mbed_official 174:8bb9f3a33240 308 ack = 1;
mbed_official 174:8bb9f3a33240 309 break;
mbed_official 174:8bb9f3a33240 310 case 0xB8: // Slave transmit ACK
mbed_official 174:8bb9f3a33240 311 ack = 1;
mbed_official 174:8bb9f3a33240 312 break;
mbed_official 174:8bb9f3a33240 313 default:
mbed_official 174:8bb9f3a33240 314 ack = 0;
mbed_official 174:8bb9f3a33240 315 break;
mbed_official 174:8bb9f3a33240 316 }
mbed_official 174:8bb9f3a33240 317
mbed_official 174:8bb9f3a33240 318 return ack;
mbed_official 174:8bb9f3a33240 319 }
mbed_official 174:8bb9f3a33240 320
mbed_official 174:8bb9f3a33240 321 void i2c_slave_mode(i2c_t *obj, int enable_slave) {
mbed_official 174:8bb9f3a33240 322 if (enable_slave != 0) {
mbed_official 174:8bb9f3a33240 323 i2c_conclr(obj, 1, 1, 1, 0);
mbed_official 174:8bb9f3a33240 324 i2c_conset(obj, 0, 0, 0, 1);
mbed_official 174:8bb9f3a33240 325 } else {
mbed_official 174:8bb9f3a33240 326 i2c_conclr(obj, 1, 1, 1, 1);
mbed_official 174:8bb9f3a33240 327 }
mbed_official 174:8bb9f3a33240 328 }
mbed_official 174:8bb9f3a33240 329
mbed_official 174:8bb9f3a33240 330 int i2c_slave_receive(i2c_t *obj) {
mbed_official 174:8bb9f3a33240 331 int status;
mbed_official 174:8bb9f3a33240 332 int retval;
mbed_official 174:8bb9f3a33240 333
mbed_official 174:8bb9f3a33240 334 status = i2c_status(obj);
mbed_official 174:8bb9f3a33240 335 switch(status) {
mbed_official 174:8bb9f3a33240 336 case 0x60: retval = 3; break;
mbed_official 174:8bb9f3a33240 337 case 0x70: retval = 2; break;
mbed_official 174:8bb9f3a33240 338 case 0xA8: retval = 1; break;
mbed_official 174:8bb9f3a33240 339 default : retval = 0; break;
mbed_official 174:8bb9f3a33240 340 }
mbed_official 174:8bb9f3a33240 341
mbed_official 174:8bb9f3a33240 342 return(retval);
mbed_official 174:8bb9f3a33240 343 }
mbed_official 174:8bb9f3a33240 344
mbed_official 174:8bb9f3a33240 345 int i2c_slave_read(i2c_t *obj, char *data, int length) {
mbed_official 174:8bb9f3a33240 346 int count = 0;
mbed_official 174:8bb9f3a33240 347 int status;
mbed_official 174:8bb9f3a33240 348
mbed_official 174:8bb9f3a33240 349 do {
mbed_official 174:8bb9f3a33240 350 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 351 i2c_wait_SI(obj);
mbed_official 174:8bb9f3a33240 352 status = i2c_status(obj);
mbed_official 174:8bb9f3a33240 353 if((status == 0x80) || (status == 0x90)) {
mbed_official 174:8bb9f3a33240 354 data[count] = I2C_DAT(obj) & 0xFF;
mbed_official 174:8bb9f3a33240 355 }
mbed_official 174:8bb9f3a33240 356 count++;
mbed_official 174:8bb9f3a33240 357 } while (((status == 0x80) || (status == 0x90) ||
mbed_official 174:8bb9f3a33240 358 (status == 0x060) || (status == 0x70)) && (count < length));
mbed_official 174:8bb9f3a33240 359
mbed_official 174:8bb9f3a33240 360 if(status != 0xA0) {
mbed_official 174:8bb9f3a33240 361 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 362 }
mbed_official 174:8bb9f3a33240 363
mbed_official 174:8bb9f3a33240 364 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 365
mbed_official 174:8bb9f3a33240 366 return count;
mbed_official 174:8bb9f3a33240 367 }
mbed_official 174:8bb9f3a33240 368
mbed_official 174:8bb9f3a33240 369 int i2c_slave_write(i2c_t *obj, const char *data, int length) {
mbed_official 174:8bb9f3a33240 370 int count = 0;
mbed_official 174:8bb9f3a33240 371 int status;
mbed_official 174:8bb9f3a33240 372
mbed_official 174:8bb9f3a33240 373 if(length <= 0) {
mbed_official 174:8bb9f3a33240 374 return(0);
mbed_official 174:8bb9f3a33240 375 }
mbed_official 174:8bb9f3a33240 376
mbed_official 174:8bb9f3a33240 377 do {
mbed_official 174:8bb9f3a33240 378 status = i2c_do_write(obj, data[count], 0);
mbed_official 174:8bb9f3a33240 379 count++;
mbed_official 174:8bb9f3a33240 380 } while ((count < length) && (status == 0xB8));
mbed_official 174:8bb9f3a33240 381
mbed_official 174:8bb9f3a33240 382 if((status != 0xC0) && (status != 0xC8)) {
mbed_official 174:8bb9f3a33240 383 i2c_stop(obj);
mbed_official 174:8bb9f3a33240 384 }
mbed_official 174:8bb9f3a33240 385
mbed_official 174:8bb9f3a33240 386 i2c_clear_SI(obj);
mbed_official 174:8bb9f3a33240 387
mbed_official 174:8bb9f3a33240 388 return(count);
mbed_official 174:8bb9f3a33240 389 }
mbed_official 174:8bb9f3a33240 390
mbed_official 174:8bb9f3a33240 391 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
mbed_official 174:8bb9f3a33240 392 uint32_t addr;
mbed_official 174:8bb9f3a33240 393
mbed_official 174:8bb9f3a33240 394 if ((idx >= 0) && (idx <= 3)) {
mbed_official 174:8bb9f3a33240 395 addr = ((uint32_t)obj->i2c) + I2C_addr_offset[0][idx];
mbed_official 174:8bb9f3a33240 396 *((uint32_t *) addr) = address & 0xFF;
mbed_official 174:8bb9f3a33240 397 }
mbed_official 174:8bb9f3a33240 398 }
mbed_official 174:8bb9f3a33240 399
mbed_official 174:8bb9f3a33240 400 #endif