siva surendar / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/TARGET_NUVOTON/TARGET_M451/i2c_api.c@150:da61ba4e9755, 2016-11-25 (annotated)

Committer:
sivasuren
Date:
Fri Nov 25 07:57:40 2016 +0000
Revision:
150:da61ba4e9755
Parent:
149:156823d33999 
surendar changes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2015-2016 Nuvoton
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16
<> 149:156823d33999 17 #include "i2c_api.h"
<> 149:156823d33999 18
<> 149:156823d33999 19 #if DEVICE_I2C
<> 149:156823d33999 20
<> 149:156823d33999 21 #include "cmsis.h"
<> 149:156823d33999 22 #include "pinmap.h"
<> 149:156823d33999 23 #include "PeripheralPins.h"
<> 149:156823d33999 24 #include "nu_modutil.h"
<> 149:156823d33999 25 #include "nu_miscutil.h"
<> 149:156823d33999 26 #include "nu_bitutil.h"
<> 149:156823d33999 27 #include "critical.h"
<> 149:156823d33999 28
<> 149:156823d33999 29 #define NU_I2C_DEBUG 0
<> 149:156823d33999 30
<> 149:156823d33999 31 #if NU_I2C_DEBUG
<> 149:156823d33999 32 struct i2c_s MY_I2C;
<> 149:156823d33999 33 struct i2c_s MY_I2C_2;
<> 149:156823d33999 34 char MY_I2C_STATUS[64];
<> 149:156823d33999 35 int MY_I2C_STATUS_POS = 0;
<> 149:156823d33999 36 uint32_t MY_I2C_TIMEOUT;
<> 149:156823d33999 37 uint32_t MY_I2C_ELAPSED;
<> 149:156823d33999 38 uint32_t MY_I2C_T1;
<> 149:156823d33999 39 uint32_t MY_I2C_T2;
<> 149:156823d33999 40 #endif
<> 149:156823d33999 41
<> 149:156823d33999 42 struct nu_i2c_var {
<> 149:156823d33999 43 i2c_t * obj;
<> 149:156823d33999 44 void (*vec)(void);
<> 149:156823d33999 45 };
<> 149:156823d33999 46
<> 149:156823d33999 47 static void i2c0_vec(void);
<> 149:156823d33999 48 static void i2c1_vec(void);
<> 149:156823d33999 49 static void i2c_irq(i2c_t *obj);
<> 149:156823d33999 50 static void i2c_fsm_reset(i2c_t *obj, uint32_t i2c_ctl);
<> 149:156823d33999 51
<> 149:156823d33999 52 static struct nu_i2c_var i2c0_var = {
<> 149:156823d33999 53 .obj = NULL,
<> 149:156823d33999 54 .vec = i2c0_vec,
<> 149:156823d33999 55 };
<> 149:156823d33999 56 static struct nu_i2c_var i2c1_var = {
<> 149:156823d33999 57 .obj = NULL,
<> 149:156823d33999 58 .vec = i2c1_vec,
<> 149:156823d33999 59 };
<> 149:156823d33999 60
<> 149:156823d33999 61 static uint32_t i2c_modinit_mask = 0;
<> 149:156823d33999 62
<> 149:156823d33999 63 static const struct nu_modinit_s i2c_modinit_tab[] = {
<> 149:156823d33999 64 {I2C_0, I2C0_MODULE, 0, 0, I2C0_RST, I2C0_IRQn, &i2c0_var},
<> 149:156823d33999 65 {I2C_1, I2C1_MODULE, 0, 0, I2C1_RST, I2C1_IRQn, &i2c1_var},
<> 149:156823d33999 66
<> 149:156823d33999 67 {NC, 0, 0, 0, 0, (IRQn_Type) 0, NULL}
<> 149:156823d33999 68 };
<> 149:156823d33999 69
<> 149:156823d33999 70 static int i2c_do_tran(i2c_t *obj, char *buf, int length, int read, int naklastdata);
<> 149:156823d33999 71 static int i2c_do_write(i2c_t *obj, char data, int naklastdata);
<> 149:156823d33999 72 static int i2c_do_read(i2c_t *obj, char *data, int naklastdata);
<> 149:156823d33999 73 static int i2c_do_trsn(i2c_t *obj, uint32_t i2c_ctl, int sync);
<> 149:156823d33999 74 #define NU_I2C_TIMEOUT_STAT_INT 500000
<> 149:156823d33999 75 #define NU_I2C_TIMEOUT_STOP 500000
<> 149:156823d33999 76 static int i2c_poll_status_timeout(i2c_t *obj, int (*is_status)(i2c_t *obj), uint32_t timeout);
<> 149:156823d33999 77 static int i2c_poll_tran_heatbeat_timeout(i2c_t *obj, uint32_t timeout);
<> 149:156823d33999 78 //static int i2c_is_stat_int(i2c_t *obj);
<> 149:156823d33999 79 //static int i2c_is_stop_det(i2c_t *obj);
<> 149:156823d33999 80 static int i2c_is_trsn_done(i2c_t *obj);
<> 149:156823d33999 81 static int i2c_is_tran_started(i2c_t *obj);
<> 149:156823d33999 82 static int i2c_addr2data(int address, int read);
<> 149:156823d33999 83 #if DEVICE_I2CSLAVE
<> 149:156823d33999 84 // Convert mbed address to BSP address.
<> 149:156823d33999 85 static int i2c_addr2bspaddr(int address);
<> 149:156823d33999 86 #endif // #if DEVICE_I2CSLAVE
<> 149:156823d33999 87 static void i2c_enable_int(i2c_t *obj);
<> 149:156823d33999 88 static void i2c_disable_int(i2c_t *obj);
<> 149:156823d33999 89 static int i2c_set_int(i2c_t *obj, int inten);
<> 149:156823d33999 90
<> 149:156823d33999 91
<> 149:156823d33999 92 #if DEVICE_I2C_ASYNCH
<> 149:156823d33999 93 static void i2c_buffer_set(i2c_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length);
<> 149:156823d33999 94 static void i2c_enable_vector_interrupt(i2c_t *obj, uint32_t handler, int enable);
<> 149:156823d33999 95 static void i2c_rollback_vector_interrupt(i2c_t *obj);
<> 149:156823d33999 96 #endif
<> 149:156823d33999 97
<> 149:156823d33999 98 #define TRANCTRL_STARTED (1)
<> 149:156823d33999 99 #define TRANCTRL_NAKLASTDATA (1 << 1)
<> 149:156823d33999 100
<> 149:156823d33999 101 uint32_t us_ticker_read(void);
<> 149:156823d33999 102
<> 149:156823d33999 103 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
<> 149:156823d33999 104 {
<> 149:156823d33999 105 uint32_t i2c_sda = pinmap_peripheral(sda, PinMap_I2C_SDA);
<> 149:156823d33999 106 uint32_t i2c_scl = pinmap_peripheral(scl, PinMap_I2C_SCL);
<> 149:156823d33999 107 obj->i2c.i2c = (I2CName) pinmap_merge(i2c_sda, i2c_scl);
<> 149:156823d33999 108 MBED_ASSERT((int)obj->i2c.i2c != NC);
<> 149:156823d33999 109
<> 149:156823d33999 110 const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
<> 149:156823d33999 111 MBED_ASSERT(modinit != NULL);
<> 149:156823d33999 112 MBED_ASSERT(modinit->modname == obj->i2c.i2c);
<> 149:156823d33999 113
<> 149:156823d33999 114 // Reset this module
<> 149:156823d33999 115 SYS_ResetModule(modinit->rsetidx);
<> 149:156823d33999 116
<> 149:156823d33999 117 // Enable IP clock
<> 149:156823d33999 118 CLK_EnableModuleClock(modinit->clkidx);
<> 149:156823d33999 119
<> 149:156823d33999 120 pinmap_pinout(sda, PinMap_I2C_SDA);
<> 149:156823d33999 121 pinmap_pinout(scl, PinMap_I2C_SCL);
<> 149:156823d33999 122
<> 149:156823d33999 123 #if DEVICE_I2C_ASYNCH
<> 149:156823d33999 124 obj->i2c.dma_usage = DMA_USAGE_NEVER;
<> 149:156823d33999 125 obj->i2c.event = 0;
<> 149:156823d33999 126 obj->i2c.stop = 0;
<> 149:156823d33999 127 obj->i2c.address = 0;
<> 149:156823d33999 128 #endif
<> 149:156823d33999 129
<> 149:156823d33999 130 // NOTE: Setting I2C bus clock to 100 KHz is required. See I2C::I2C in common/I2C.cpp.
<> 149:156823d33999 131 I2C_Open((I2C_T *) NU_MODBASE(obj->i2c.i2c), 100000);
<> 149:156823d33999 132 // NOTE: INTEN bit and FSM control bits (STA, STO, SI, AA) are packed in one register CTL. We cannot control interrupt through
<> 149:156823d33999 133 // INTEN bit without impacting FSM control bits. Use NVIC_EnableIRQ/NVIC_DisableIRQ instead for interrupt control.
<> 149:156823d33999 134 I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
<> 149:156823d33999 135 i2c_base->CTL |= (I2C_CTL_INTEN_Msk | I2C_CTL_I2CEN_Msk);
<> 149:156823d33999 136
<> 149:156823d33999 137 // Enable sync-moce vector interrupt.
<> 149:156823d33999 138 struct nu_i2c_var *var = (struct nu_i2c_var *) modinit->var;
<> 149:156823d33999 139 var->obj = obj;
<> 149:156823d33999 140 obj->i2c.tran_ctrl = 0;
<> 149:156823d33999 141 obj->i2c.stop = 0;
<> 149:156823d33999 142 i2c_enable_vector_interrupt(obj, (uint32_t) var->vec, 1);
<> 149:156823d33999 143
<> 149:156823d33999 144 // Mark this module to be inited.
<> 149:156823d33999 145 int i = modinit - i2c_modinit_tab;
<> 149:156823d33999 146 i2c_modinit_mask |= 1 << i;
<> 149:156823d33999 147 }
<> 149:156823d33999 148
<> 149:156823d33999 149 int i2c_start(i2c_t *obj)
<> 149:156823d33999 150 {
<> 149:156823d33999 151 return i2c_do_trsn(obj, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk, 1);
<> 149:156823d33999 152 }
<> 149:156823d33999 153
<> 149:156823d33999 154 int i2c_stop(i2c_t *obj)
<> 149:156823d33999 155 {
<> 149:156823d33999 156 return i2c_do_trsn(obj, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk, 1);
<> 149:156823d33999 157 }
<> 149:156823d33999 158
<> 149:156823d33999 159 void i2c_frequency(i2c_t *obj, int hz)
<> 149:156823d33999 160 {
<> 149:156823d33999 161 I2C_SetBusClockFreq((I2C_T *) NU_MODBASE(obj->i2c.i2c), hz);
<> 149:156823d33999 162 }
<> 149:156823d33999 163
<> 149:156823d33999 164 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
<> 149:156823d33999 165 {
<> 149:156823d33999 166 if (i2c_start(obj)) {
<> 149:156823d33999 167 i2c_stop(obj);
<> 149:156823d33999 168 return I2C_ERROR_BUS_BUSY;
<> 149:156823d33999 169 }
<> 149:156823d33999 170
<> 149:156823d33999 171 if (i2c_do_write(obj, i2c_addr2data(address, 1), 0)) {
<> 149:156823d33999 172 i2c_stop(obj);
<> 149:156823d33999 173 return I2C_ERROR_NO_SLAVE;
<> 149:156823d33999 174 }
<> 149:156823d33999 175
<> 149:156823d33999 176 // Read in bytes
<> 149:156823d33999 177 length = i2c_do_tran(obj, data, length, 1, 1);
<> 149:156823d33999 178
<> 149:156823d33999 179 // If not repeated start, send stop.
<> 149:156823d33999 180 if (stop) {
<> 149:156823d33999 181 i2c_stop(obj);
<> 149:156823d33999 182 }
<> 149:156823d33999 183
<> 149:156823d33999 184 return length;
<> 149:156823d33999 185 }
<> 149:156823d33999 186
<> 149:156823d33999 187 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
<> 149:156823d33999 188 {
<> 149:156823d33999 189 if (i2c_start(obj)) {
<> 149:156823d33999 190 i2c_stop(obj);
<> 149:156823d33999 191 return I2C_ERROR_BUS_BUSY;
<> 149:156823d33999 192 }
<> 149:156823d33999 193
<> 149:156823d33999 194 if (i2c_do_write(obj, i2c_addr2data(address, 0), 0)) {
<> 149:156823d33999 195 i2c_stop(obj);
<> 149:156823d33999 196 return I2C_ERROR_NO_SLAVE;
<> 149:156823d33999 197 }
<> 149:156823d33999 198
<> 149:156823d33999 199 // Write out bytes
<> 149:156823d33999 200 length = i2c_do_tran(obj, (char *) data, length, 0, 1);
<> 149:156823d33999 201
<> 149:156823d33999 202 if (stop) {
<> 149:156823d33999 203 i2c_stop(obj);
<> 149:156823d33999 204 }
<> 149:156823d33999 205
<> 149:156823d33999 206 return length;
<> 149:156823d33999 207 }
<> 149:156823d33999 208
<> 149:156823d33999 209 void i2c_reset(i2c_t *obj)
<> 149:156823d33999 210 {
<> 149:156823d33999 211 i2c_stop(obj);
<> 149:156823d33999 212 }
<> 149:156823d33999 213
<> 149:156823d33999 214 int i2c_byte_read(i2c_t *obj, int last)
<> 149:156823d33999 215 {
<> 149:156823d33999 216 char data = 0;
<> 149:156823d33999 217
<> 149:156823d33999 218 i2c_do_read(obj, &data, last);
<> 149:156823d33999 219 return data;
<> 149:156823d33999 220 }
<> 149:156823d33999 221
<> 149:156823d33999 222 int i2c_byte_write(i2c_t *obj, int data)
<> 149:156823d33999 223 {
<> 149:156823d33999 224 return i2c_do_write(obj, (data & 0xFF), 0);
<> 149:156823d33999 225 }
<> 149:156823d33999 226
<> 149:156823d33999 227 #if DEVICE_I2CSLAVE
<> 149:156823d33999 228
<> 149:156823d33999 229 // See I2CSlave.h
<> 149:156823d33999 230 #define NoData 0 // the slave has not been addressed
<> 149:156823d33999 231 #define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
<> 149:156823d33999 232 #define WriteGeneral 2 // the master is writing to all slave
<> 149:156823d33999 233 #define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
<> 149:156823d33999 234
<> 149:156823d33999 235 void i2c_slave_mode(i2c_t *obj, int enable_slave)
<> 149:156823d33999 236 {
<> 149:156823d33999 237 I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
<> 149:156823d33999 238
<> 149:156823d33999 239 i2c_disable_int(obj);
<> 149:156823d33999 240
<> 149:156823d33999 241 obj->i2c.slaveaddr_state = NoData;
<> 149:156823d33999 242
<> 149:156823d33999 243 // Switch to not addressed mode
<> 149:156823d33999 244 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
<> 149:156823d33999 245
<> 149:156823d33999 246 i2c_enable_int(obj);
<> 149:156823d33999 247 }
<> 149:156823d33999 248
<> 149:156823d33999 249 int i2c_slave_receive(i2c_t *obj)
<> 149:156823d33999 250 {
<> 149:156823d33999 251 int slaveaddr_state;
<> 149:156823d33999 252
<> 149:156823d33999 253 i2c_disable_int(obj);
<> 149:156823d33999 254 slaveaddr_state = obj->i2c.slaveaddr_state;
<> 149:156823d33999 255 i2c_enable_int(obj);
<> 149:156823d33999 256
<> 149:156823d33999 257 return slaveaddr_state;
<> 149:156823d33999 258 }
<> 149:156823d33999 259
<> 149:156823d33999 260 int i2c_slave_read(i2c_t *obj, char *data, int length)
<> 149:156823d33999 261 {
<> 149:156823d33999 262 return i2c_do_tran(obj, data, length, 1, 1);
<> 149:156823d33999 263 }
<> 149:156823d33999 264
<> 149:156823d33999 265 int i2c_slave_write(i2c_t *obj, const char *data, int length)
<> 149:156823d33999 266 {
<> 149:156823d33999 267 return i2c_do_tran(obj, (char *) data, length, 0, 1);
<> 149:156823d33999 268 }
<> 149:156823d33999 269
<> 149:156823d33999 270 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
<> 149:156823d33999 271 {
<> 149:156823d33999 272 I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
<> 149:156823d33999 273
<> 149:156823d33999 274 i2c_disable_int(obj);
<> 149:156823d33999 275
<> 149:156823d33999 276 I2C_SetSlaveAddr(i2c_base, 0, i2c_addr2bspaddr(address), I2C_GCMODE_ENABLE);
<> 149:156823d33999 277
<> 149:156823d33999 278 i2c_enable_int(obj);
<> 149:156823d33999 279 }
<> 149:156823d33999 280
<> 149:156823d33999 281 static int i2c_addr2bspaddr(int address)
<> 149:156823d33999 282 {
<> 149:156823d33999 283 return (address >> 1);
<> 149:156823d33999 284 }
<> 149:156823d33999 285
<> 149:156823d33999 286 #endif // #if DEVICE_I2CSLAVE
<> 149:156823d33999 287
<> 149:156823d33999 288 static void i2c_enable_int(i2c_t *obj)
<> 149:156823d33999 289 {
<> 149:156823d33999 290 const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
<> 149:156823d33999 291
<> 149:156823d33999 292 core_util_critical_section_enter();
<> 149:156823d33999 293
<> 149:156823d33999 294 // Enable I2C interrupt
<> 149:156823d33999 295 NVIC_EnableIRQ(modinit->irq_n);
<> 149:156823d33999 296 obj->i2c.inten = 1;
<> 149:156823d33999 297
<> 149:156823d33999 298 core_util_critical_section_exit();
<> 149:156823d33999 299 }
<> 149:156823d33999 300
<> 149:156823d33999 301 static void i2c_disable_int(i2c_t *obj)
<> 149:156823d33999 302 {
<> 149:156823d33999 303 const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
<> 149:156823d33999 304
<> 149:156823d33999 305 core_util_critical_section_enter();
<> 149:156823d33999 306
<> 149:156823d33999 307 // Disable I2C interrupt
<> 149:156823d33999 308 NVIC_DisableIRQ(modinit->irq_n);
<> 149:156823d33999 309 obj->i2c.inten = 0;
<> 149:156823d33999 310
<> 149:156823d33999 311 core_util_critical_section_exit();
<> 149:156823d33999 312 }
<> 149:156823d33999 313
<> 149:156823d33999 314 static int i2c_set_int(i2c_t *obj, int inten)
<> 149:156823d33999 315 {
<> 149:156823d33999 316 int inten_back;
<> 149:156823d33999 317
<> 149:156823d33999 318 core_util_critical_section_enter();
<> 149:156823d33999 319
<> 149:156823d33999 320 inten_back = obj->i2c.inten;
<> 149:156823d33999 321
<> 149:156823d33999 322 core_util_critical_section_exit();
<> 149:156823d33999 323
<> 149:156823d33999 324 if (inten) {
<> 149:156823d33999 325 i2c_enable_int(obj);
<> 149:156823d33999 326 }
<> 149:156823d33999 327 else {
<> 149:156823d33999 328 i2c_disable_int(obj);
<> 149:156823d33999 329 }
<> 149:156823d33999 330
<> 149:156823d33999 331 return inten_back;
<> 149:156823d33999 332 }
<> 149:156823d33999 333
<> 149:156823d33999 334 int i2c_allow_powerdown(void)
<> 149:156823d33999 335 {
<> 149:156823d33999 336 uint32_t modinit_mask = i2c_modinit_mask;
<> 149:156823d33999 337 while (modinit_mask) {
<> 149:156823d33999 338 int i2c_idx = nu_ctz(modinit_mask);
<> 149:156823d33999 339 const struct nu_modinit_s *modinit = i2c_modinit_tab + i2c_idx;
<> 149:156823d33999 340 struct nu_i2c_var *var = (struct nu_i2c_var *) modinit->var;
<> 149:156823d33999 341 if (var->obj) {
<> 149:156823d33999 342 // Disallow entering power-down mode if I2C transfer is enabled.
<> 149:156823d33999 343 if (i2c_active(var->obj)) {
<> 149:156823d33999 344 return 0;
<> 149:156823d33999 345 }
<> 149:156823d33999 346 }
<> 149:156823d33999 347 modinit_mask &= ~(1 << i2c_idx);
<> 149:156823d33999 348 }
<> 149:156823d33999 349
<> 149:156823d33999 350 return 1;
<> 149:156823d33999 351 }
<> 149:156823d33999 352
<> 149:156823d33999 353 static int i2c_do_tran(i2c_t *obj, char *buf, int length, int read, int naklastdata)
<> 149:156823d33999 354 {
<> 149:156823d33999 355 int tran_len = 0;
<> 149:156823d33999 356
<> 149:156823d33999 357 i2c_disable_int(obj);
<> 149:156823d33999 358 obj->i2c.tran_ctrl = naklastdata ? (TRANCTRL_STARTED | TRANCTRL_NAKLASTDATA) : TRANCTRL_STARTED;
<> 149:156823d33999 359 obj->i2c.tran_beg = buf;
<> 149:156823d33999 360 obj->i2c.tran_pos = buf;
<> 149:156823d33999 361 obj->i2c.tran_end = buf + length;
<> 149:156823d33999 362 i2c_enable_int(obj);
<> 149:156823d33999 363
<> 149:156823d33999 364 if (i2c_poll_tran_heatbeat_timeout(obj, NU_I2C_TIMEOUT_STAT_INT)) {
<> 149:156823d33999 365 #if NU_I2C_DEBUG
<> 149:156823d33999 366 MY_I2C_2 = obj->i2c;
<> 149:156823d33999 367 while (1);
<> 149:156823d33999 368 #endif
<> 149:156823d33999 369 }
<> 149:156823d33999 370 else {
<> 149:156823d33999 371 i2c_disable_int(obj);
<> 149:156823d33999 372 obj->i2c.tran_ctrl = 0;
<> 149:156823d33999 373 tran_len = obj->i2c.tran_pos - obj->i2c.tran_beg;
<> 149:156823d33999 374 obj->i2c.tran_beg = NULL;
<> 149:156823d33999 375 obj->i2c.tran_pos = NULL;
<> 149:156823d33999 376 obj->i2c.tran_end = NULL;
<> 149:156823d33999 377 i2c_enable_int(obj);
<> 149:156823d33999 378 }
<> 149:156823d33999 379
<> 149:156823d33999 380 return tran_len;
<> 149:156823d33999 381 }
<> 149:156823d33999 382
<> 149:156823d33999 383 static int i2c_do_write(i2c_t *obj, char data, int naklastdata)
<> 149:156823d33999 384 {
<> 149:156823d33999 385 char data_[1];
<> 149:156823d33999 386 data_[0] = data;
<> 149:156823d33999 387 return i2c_do_tran(obj, data_, 1, 0, naklastdata) == 1 ? 0 : I2C_ERROR_BUS_BUSY;
<> 149:156823d33999 388 }
<> 149:156823d33999 389
<> 149:156823d33999 390 static int i2c_do_read(i2c_t *obj, char *data, int naklastdata)
<> 149:156823d33999 391 {
<> 149:156823d33999 392 return i2c_do_tran(obj, data, 1, 1, naklastdata) == 1 ? 0 : I2C_ERROR_BUS_BUSY;
<> 149:156823d33999 393 }
<> 149:156823d33999 394
<> 149:156823d33999 395 static int i2c_do_trsn(i2c_t *obj, uint32_t i2c_ctl, int sync)
<> 149:156823d33999 396 {
<> 149:156823d33999 397 I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
<> 149:156823d33999 398 int err = 0;
<> 149:156823d33999 399
<> 149:156823d33999 400 i2c_disable_int(obj);
<> 149:156823d33999 401
<> 149:156823d33999 402 if (i2c_poll_status_timeout(obj, i2c_is_trsn_done, NU_I2C_TIMEOUT_STAT_INT)) {
<> 149:156823d33999 403 err = I2C_ERROR_BUS_BUSY;
<> 149:156823d33999 404 #if NU_I2C_DEBUG
<> 149:156823d33999 405 MY_I2C_2 = obj->i2c;
<> 149:156823d33999 406 while (1);
<> 149:156823d33999 407 #endif
<> 149:156823d33999 408 }
<> 149:156823d33999 409 else {
<> 149:156823d33999 410 #if 1
<> 149:156823d33999 411 // NOTE: Avoid duplicate Start/Stop. Otherwise, we may meet strange error.
<> 149:156823d33999 412 uint32_t status = I2C_GET_STATUS(i2c_base);
<> 149:156823d33999 413
<> 149:156823d33999 414 switch (status) {
<> 149:156823d33999 415 case 0x08: // Start
<> 149:156823d33999 416 case 0x10: // Master Repeat Start
<> 149:156823d33999 417 if (i2c_ctl & I2C_CTL_STA_Msk) {
<> 149:156823d33999 418 return 0;
<> 149:156823d33999 419 }
<> 149:156823d33999 420 else {
<> 149:156823d33999 421 break;
<> 149:156823d33999 422 }
<> 149:156823d33999 423 case 0xF8: // Bus Released
<> 149:156823d33999 424 if (i2c_ctl & (I2C_CTL_STA_Msk | I2C_CTL_STO_Msk) == I2C_CTL_STO_Msk) {
<> 149:156823d33999 425 return 0;
<> 149:156823d33999 426 }
<> 149:156823d33999 427 else {
<> 149:156823d33999 428 break;
<> 149:156823d33999 429 }
<> 149:156823d33999 430 }
<> 149:156823d33999 431 #endif
<> 149:156823d33999 432 I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
<> 149:156823d33999 433 if (sync && i2c_poll_status_timeout(obj, i2c_is_trsn_done, NU_I2C_TIMEOUT_STAT_INT)) {
<> 149:156823d33999 434 err = I2C_ERROR_BUS_BUSY;
<> 149:156823d33999 435 #if NU_I2C_DEBUG
<> 149:156823d33999 436 MY_I2C_2 = obj->i2c;
<> 149:156823d33999 437 while (1);
<> 149:156823d33999 438 #endif
<> 149:156823d33999 439 }
<> 149:156823d33999 440 }
<> 149:156823d33999 441
<> 149:156823d33999 442 i2c_enable_int(obj);
<> 149:156823d33999 443
<> 149:156823d33999 444 return err;
<> 149:156823d33999 445 }
<> 149:156823d33999 446
<> 149:156823d33999 447 static int i2c_poll_status_timeout(i2c_t *obj, int (*is_status)(i2c_t *obj), uint32_t timeout)
<> 149:156823d33999 448 {
<> 149:156823d33999 449 uint32_t t1, t2, elapsed = 0;
<> 149:156823d33999 450 int status_assert = 0;
<> 149:156823d33999 451
<> 149:156823d33999 452 t1 = us_ticker_read();
<> 149:156823d33999 453 while (1) {
<> 149:156823d33999 454 status_assert = is_status(obj);
<> 149:156823d33999 455 if (status_assert) {
<> 149:156823d33999 456 break;
<> 149:156823d33999 457 }
<> 149:156823d33999 458
<> 149:156823d33999 459 t2 = us_ticker_read();
<> 149:156823d33999 460 elapsed = (t2 > t1) ? (t2 - t1) : ((uint64_t) t2 + 0xFFFFFFFF - t1 + 1);
<> 149:156823d33999 461 if (elapsed >= timeout) {
<> 149:156823d33999 462 #if NU_I2C_DEBUG
<> 149:156823d33999 463 MY_I2C_T1 = t1;
<> 149:156823d33999 464 MY_I2C_T2 = t2;
<> 149:156823d33999 465 MY_I2C_ELAPSED = elapsed;
<> 149:156823d33999 466 MY_I2C_TIMEOUT = timeout;
<> 149:156823d33999 467 MY_I2C_2 = obj->i2c;
<> 149:156823d33999 468 while (1);
<> 149:156823d33999 469 #endif
<> 149:156823d33999 470 break;
<> 149:156823d33999 471 }
<> 149:156823d33999 472 }
<> 149:156823d33999 473
<> 149:156823d33999 474 return (elapsed >= timeout);
<> 149:156823d33999 475 }
<> 149:156823d33999 476
<> 149:156823d33999 477 static int i2c_poll_tran_heatbeat_timeout(i2c_t *obj, uint32_t timeout)
<> 149:156823d33999 478 {
<> 149:156823d33999 479 uint32_t t1, t2, elapsed = 0;
<> 149:156823d33999 480 int tran_started;
<> 149:156823d33999 481 char *tran_pos = NULL;
<> 149:156823d33999 482 char *tran_pos2 = NULL;
<> 149:156823d33999 483
<> 149:156823d33999 484 i2c_disable_int(obj);
<> 149:156823d33999 485 tran_pos = obj->i2c.tran_pos;
<> 149:156823d33999 486 i2c_enable_int(obj);
<> 149:156823d33999 487 t1 = us_ticker_read();
<> 149:156823d33999 488 while (1) {
<> 149:156823d33999 489 i2c_disable_int(obj);
<> 149:156823d33999 490 tran_started = i2c_is_tran_started(obj);
<> 149:156823d33999 491 i2c_enable_int(obj);
<> 149:156823d33999 492 if (! tran_started) { // Transfer completed or stopped
<> 149:156823d33999 493 break;
<> 149:156823d33999 494 }
<> 149:156823d33999 495
<> 149:156823d33999 496 i2c_disable_int(obj);
<> 149:156823d33999 497 tran_pos2 = obj->i2c.tran_pos;
<> 149:156823d33999 498 i2c_enable_int(obj);
<> 149:156823d33999 499 t2 = us_ticker_read();
<> 149:156823d33999 500 if (tran_pos2 != tran_pos) { // Transfer on-going
<> 149:156823d33999 501 t1 = t2;
<> 149:156823d33999 502 tran_pos = tran_pos2;
<> 149:156823d33999 503 continue;
<> 149:156823d33999 504 }
<> 149:156823d33999 505
<> 149:156823d33999 506 elapsed = (t2 > t1) ? (t2 - t1) : ((uint64_t) t2 + 0xFFFFFFFF - t1 + 1);
<> 149:156823d33999 507 if (elapsed >= timeout) { // Transfer idle
<> 149:156823d33999 508 #if NU_I2C_DEBUG
<> 149:156823d33999 509 MY_I2C = obj->i2c;
<> 149:156823d33999 510 MY_I2C_T1 = t1;
<> 149:156823d33999 511 MY_I2C_T2 = t2;
<> 149:156823d33999 512 MY_I2C_ELAPSED = elapsed;
<> 149:156823d33999 513 MY_I2C_TIMEOUT = timeout;
<> 149:156823d33999 514 MY_I2C_2 = obj->i2c;
<> 149:156823d33999 515 while (1);
<> 149:156823d33999 516 #endif
<> 149:156823d33999 517 break;
<> 149:156823d33999 518 }
<> 149:156823d33999 519 }
<> 149:156823d33999 520
<> 149:156823d33999 521 return (elapsed >= timeout);
<> 149:156823d33999 522 }
<> 149:156823d33999 523
<> 149:156823d33999 524 #if 0
<> 149:156823d33999 525 static int i2c_is_stat_int(i2c_t *obj)
<> 149:156823d33999 526 {
<> 149:156823d33999 527 I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
<> 149:156823d33999 528
<> 149:156823d33999 529 return !! (i2c_base->CTL & I2C_CTL_SI_Msk);
<> 149:156823d33999 530 }
<> 149:156823d33999 531
<> 149:156823d33999 532 static int i2c_is_stop_det(i2c_t *obj)
<> 149:156823d33999 533 {
<> 149:156823d33999 534 I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
<> 149:156823d33999 535
<> 149:156823d33999 536 return ! (i2c_base->CTL & I2C_CTL_STO_Msk);
<> 149:156823d33999 537 }
<> 149:156823d33999 538 #endif
<> 149:156823d33999 539
<> 149:156823d33999 540 static int i2c_is_trsn_done(i2c_t *obj)
<> 149:156823d33999 541 {
<> 149:156823d33999 542 I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
<> 149:156823d33999 543 int i2c_int;
<> 149:156823d33999 544 uint32_t status;
<> 149:156823d33999 545 int inten_back;
<> 149:156823d33999 546
<> 149:156823d33999 547 inten_back = i2c_set_int(obj, 0);
<> 149:156823d33999 548 i2c_int = !! (i2c_base->CTL & I2C_CTL_SI_Msk);
<> 149:156823d33999 549 status = I2C_GET_STATUS(i2c_base);
<> 149:156823d33999 550 i2c_set_int(obj, inten_back);
<> 149:156823d33999 551
<> 149:156823d33999 552 return (i2c_int || status == 0xF8);
<> 149:156823d33999 553 }
<> 149:156823d33999 554
<> 149:156823d33999 555 static int i2c_is_tran_started(i2c_t *obj)
<> 149:156823d33999 556 {
<> 149:156823d33999 557 int started;
<> 149:156823d33999 558 int inten_back;
<> 149:156823d33999 559
<> 149:156823d33999 560 inten_back = i2c_set_int(obj, 0);
<> 149:156823d33999 561 started = !! (obj->i2c.tran_ctrl & TRANCTRL_STARTED);
<> 149:156823d33999 562 i2c_set_int(obj, inten_back);
<> 149:156823d33999 563
<> 149:156823d33999 564 return started;
<> 149:156823d33999 565 }
<> 149:156823d33999 566
<> 149:156823d33999 567 static int i2c_addr2data(int address, int read)
<> 149:156823d33999 568 {
<> 149:156823d33999 569 return read ? (address | 1) : (address & 0xFE);
<> 149:156823d33999 570 }
<> 149:156823d33999 571
<> 149:156823d33999 572 static void i2c0_vec(void)
<> 149:156823d33999 573 {
<> 149:156823d33999 574 i2c_irq(i2c0_var.obj);
<> 149:156823d33999 575 }
<> 149:156823d33999 576 static void i2c1_vec(void)
<> 149:156823d33999 577 {
<> 149:156823d33999 578 i2c_irq(i2c1_var.obj);
<> 149:156823d33999 579 }
<> 149:156823d33999 580
<> 149:156823d33999 581 static void i2c_irq(i2c_t *obj)
<> 149:156823d33999 582 {
<> 149:156823d33999 583 I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
<> 149:156823d33999 584 uint32_t status;
<> 149:156823d33999 585
<> 149:156823d33999 586 if (I2C_GET_TIMEOUT_FLAG(i2c_base)) {
<> 149:156823d33999 587 I2C_ClearTimeoutFlag(i2c_base);
<> 149:156823d33999 588 return;
<> 149:156823d33999 589 }
<> 149:156823d33999 590
<> 149:156823d33999 591 status = I2C_GET_STATUS(i2c_base);
<> 149:156823d33999 592 #if NU_I2C_DEBUG
<> 149:156823d33999 593 if (MY_I2C_STATUS_POS < (sizeof (MY_I2C_STATUS) / sizeof (MY_I2C_STATUS[0]))) {
<> 149:156823d33999 594 MY_I2C_STATUS[MY_I2C_STATUS_POS ++] = status;
<> 149:156823d33999 595 }
<> 149:156823d33999 596 else {
<> 149:156823d33999 597 memset(MY_I2C_STATUS, 0x00, sizeof (MY_I2C_STATUS));
<> 149:156823d33999 598 MY_I2C_STATUS_POS = 0;
<> 149:156823d33999 599 }
<> 149:156823d33999 600 #endif
<> 149:156823d33999 601
<> 149:156823d33999 602 switch (status) {
<> 149:156823d33999 603 // Master Transmit
<> 149:156823d33999 604 case 0x28: // Master Transmit Data ACK
<> 149:156823d33999 605 case 0x18: // Master Transmit Address ACK
<> 149:156823d33999 606 case 0x08: // Start
<> 149:156823d33999 607 case 0x10: // Master Repeat Start
<> 149:156823d33999 608 if ((obj->i2c.tran_ctrl & TRANCTRL_STARTED) && obj->i2c.tran_pos) {
<> 149:156823d33999 609 if (obj->i2c.tran_pos < obj->i2c.tran_end) {
<> 149:156823d33999 610 I2C_SET_DATA(i2c_base, *obj->i2c.tran_pos ++);
<> 149:156823d33999 611 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
<> 149:156823d33999 612 }
<> 149:156823d33999 613 else {
<> 149:156823d33999 614 if (status == 0x18) {
<> 149:156823d33999 615 obj->i2c.tran_ctrl &= ~TRANCTRL_STARTED;
<> 149:156823d33999 616 i2c_disable_int(obj);
<> 149:156823d33999 617 break;
<> 149:156823d33999 618 }
<> 149:156823d33999 619 // Go Master Repeat Start
<> 149:156823d33999 620 i2c_fsm_reset(obj, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 621 }
<> 149:156823d33999 622 }
<> 149:156823d33999 623 else {
<> 149:156823d33999 624 i2c_disable_int(obj);
<> 149:156823d33999 625 }
<> 149:156823d33999 626 break;
<> 149:156823d33999 627 case 0x30: // Master Transmit Data NACK
<> 149:156823d33999 628 case 0x20: // Master Transmit Address NACK
<> 149:156823d33999 629 // Go Master Repeat Start
<> 149:156823d33999 630 i2c_fsm_reset(obj, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 631 break;
<> 149:156823d33999 632 case 0x38: // Master Arbitration Lost
<> 149:156823d33999 633 i2c_fsm_reset(obj, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
<> 149:156823d33999 634 break;
<> 149:156823d33999 635
<> 149:156823d33999 636 case 0x48: // Master Receive Address NACK
<> 149:156823d33999 637 // Go Master Repeat Start
<> 149:156823d33999 638 i2c_fsm_reset(obj, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 639 break;
<> 149:156823d33999 640 case 0x40: // Master Receive Address ACK
<> 149:156823d33999 641 case 0x50: // Master Receive Data ACK
<> 149:156823d33999 642 case 0x58: // Master Receive Data NACK
<> 149:156823d33999 643 if ((obj->i2c.tran_ctrl & TRANCTRL_STARTED) && obj->i2c.tran_pos) {
<> 149:156823d33999 644 if (obj->i2c.tran_pos < obj->i2c.tran_end) {
<> 149:156823d33999 645 if (status == 0x50 || status == 0x58) {
<> 149:156823d33999 646 *obj->i2c.tran_pos ++ = I2C_GET_DATA(i2c_base);
<> 149:156823d33999 647 }
<> 149:156823d33999 648
<> 149:156823d33999 649 if (status == 0x58) {
<> 149:156823d33999 650 #if NU_I2C_DEBUG
<> 149:156823d33999 651 if (obj->i2c.tran_pos != obj->i2c.tran_end) {
<> 149:156823d33999 652 MY_I2C = obj->i2c;
<> 149:156823d33999 653 while (1);
<> 149:156823d33999 654 }
<> 149:156823d33999 655 #endif
<> 149:156823d33999 656 // Go Master Repeat Start
<> 149:156823d33999 657 i2c_fsm_reset(obj, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 658 }
<> 149:156823d33999 659 else {
<> 149:156823d33999 660 uint32_t i2c_ctl = I2C_CTL_SI_Msk | I2C_CTL_AA_Msk;
<> 149:156823d33999 661 if ((obj->i2c.tran_end - obj->i2c.tran_pos) == 1 &&
<> 149:156823d33999 662 obj->i2c.tran_ctrl & TRANCTRL_NAKLASTDATA) {
<> 149:156823d33999 663 // Last data
<> 149:156823d33999 664 i2c_ctl &= ~I2C_CTL_AA_Msk;
<> 149:156823d33999 665 }
<> 149:156823d33999 666 I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
<> 149:156823d33999 667 }
<> 149:156823d33999 668 }
<> 149:156823d33999 669 else {
<> 149:156823d33999 670 obj->i2c.tran_ctrl &= ~TRANCTRL_STARTED;
<> 149:156823d33999 671 i2c_disable_int(obj);
<> 149:156823d33999 672 break;
<> 149:156823d33999 673 }
<> 149:156823d33999 674 }
<> 149:156823d33999 675 else {
<> 149:156823d33999 676 i2c_disable_int(obj);
<> 149:156823d33999 677 }
<> 149:156823d33999 678 break;
<> 149:156823d33999 679
<> 149:156823d33999 680 //case 0x00: // Bus error
<> 149:156823d33999 681
<> 149:156823d33999 682 // Slave Transmit
<> 149:156823d33999 683 case 0xB8: // Slave Transmit Data ACK
<> 149:156823d33999 684 case 0xA8: // Slave Transmit Address ACK
<> 149:156823d33999 685 case 0xB0: // Slave Transmit Arbitration Lost
<> 149:156823d33999 686 if ((obj->i2c.tran_ctrl & TRANCTRL_STARTED) && obj->i2c.tran_pos) {
<> 149:156823d33999 687 if (obj->i2c.tran_pos < obj->i2c.tran_end) {
<> 149:156823d33999 688 uint32_t i2c_ctl = I2C_CTL_SI_Msk | I2C_CTL_AA_Msk;
<> 149:156823d33999 689
<> 149:156823d33999 690 I2C_SET_DATA(i2c_base, *obj->i2c.tran_pos ++);
<> 149:156823d33999 691 if (obj->i2c.tran_pos == obj->i2c.tran_end &&
<> 149:156823d33999 692 obj->i2c.tran_ctrl & TRANCTRL_NAKLASTDATA) {
<> 149:156823d33999 693 // Last data
<> 149:156823d33999 694 i2c_ctl &= ~I2C_CTL_AA_Msk;
<> 149:156823d33999 695 }
<> 149:156823d33999 696 I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
<> 149:156823d33999 697 }
<> 149:156823d33999 698 else {
<> 149:156823d33999 699 obj->i2c.tran_ctrl &= ~TRANCTRL_STARTED;
<> 149:156823d33999 700 i2c_disable_int(obj);
<> 149:156823d33999 701 break;
<> 149:156823d33999 702 }
<> 149:156823d33999 703 }
<> 149:156823d33999 704 else {
<> 149:156823d33999 705 i2c_disable_int(obj);
<> 149:156823d33999 706 }
<> 149:156823d33999 707 obj->i2c.slaveaddr_state = ReadAddressed;
<> 149:156823d33999 708 break;
<> 149:156823d33999 709 //case 0xA0: // Slave Transmit Repeat Start or Stop
<> 149:156823d33999 710 case 0xC0: // Slave Transmit Data NACK
<> 149:156823d33999 711 case 0xC8: // Slave Transmit Last Data ACK
<> 149:156823d33999 712 obj->i2c.slaveaddr_state = NoData;
<> 149:156823d33999 713 i2c_fsm_reset(obj, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
<> 149:156823d33999 714 break;
<> 149:156823d33999 715
<> 149:156823d33999 716 // Slave Receive
<> 149:156823d33999 717 case 0x80: // Slave Receive Data ACK
<> 149:156823d33999 718 case 0x88: // Slave Receive Data NACK
<> 149:156823d33999 719 case 0x60: // Slave Receive Address ACK
<> 149:156823d33999 720 case 0x68: // Slave Receive Arbitration Lost
<> 149:156823d33999 721 obj->i2c.slaveaddr_state = WriteAddressed;
<> 149:156823d33999 722 if ((obj->i2c.tran_ctrl & TRANCTRL_STARTED) && obj->i2c.tran_pos) {
<> 149:156823d33999 723 if (obj->i2c.tran_pos < obj->i2c.tran_end) {
<> 149:156823d33999 724 if (status == 0x80 || status == 0x88) {
<> 149:156823d33999 725 *obj->i2c.tran_pos ++ = I2C_GET_DATA(i2c_base);
<> 149:156823d33999 726 }
<> 149:156823d33999 727
<> 149:156823d33999 728 if (status == 0x88) {
<> 149:156823d33999 729 #if NU_I2C_DEBUG
<> 149:156823d33999 730 if (obj->i2c.tran_pos != obj->i2c.tran_end) {
<> 149:156823d33999 731 MY_I2C = obj->i2c;
<> 149:156823d33999 732 while (1);
<> 149:156823d33999 733 }
<> 149:156823d33999 734 #endif
<> 149:156823d33999 735 obj->i2c.slaveaddr_state = NoData;
<> 149:156823d33999 736 i2c_fsm_reset(obj, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
<> 149:156823d33999 737 }
<> 149:156823d33999 738 else {
<> 149:156823d33999 739 uint32_t i2c_ctl = I2C_CTL_SI_Msk | I2C_CTL_AA_Msk;
<> 149:156823d33999 740 if ((obj->i2c.tran_end - obj->i2c.tran_pos) == 1 &&
<> 149:156823d33999 741 obj->i2c.tran_ctrl & TRANCTRL_NAKLASTDATA) {
<> 149:156823d33999 742 // Last data
<> 149:156823d33999 743 i2c_ctl &= ~I2C_CTL_AA_Msk;
<> 149:156823d33999 744 }
<> 149:156823d33999 745 I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
<> 149:156823d33999 746 }
<> 149:156823d33999 747 }
<> 149:156823d33999 748 else {
<> 149:156823d33999 749 obj->i2c.tran_ctrl &= ~TRANCTRL_STARTED;
<> 149:156823d33999 750 i2c_disable_int(obj);
<> 149:156823d33999 751 break;
<> 149:156823d33999 752 }
<> 149:156823d33999 753 }
<> 149:156823d33999 754 else {
<> 149:156823d33999 755 i2c_disable_int(obj);
<> 149:156823d33999 756 }
<> 149:156823d33999 757 break;
<> 149:156823d33999 758 //case 0xA0: // Slave Receive Repeat Start or Stop
<> 149:156823d33999 759
<> 149:156823d33999 760 // GC mode
<> 149:156823d33999 761 //case 0xA0: // GC mode Repeat Start or Stop
<> 149:156823d33999 762 case 0x90: // GC mode Data ACK
<> 149:156823d33999 763 case 0x98: // GC mode Data NACK
<> 149:156823d33999 764 case 0x70: // GC mode Address ACK
<> 149:156823d33999 765 case 0x78: // GC mode Arbitration Lost
<> 149:156823d33999 766 obj->i2c.slaveaddr_state = WriteAddressed;
<> 149:156823d33999 767 if ((obj->i2c.tran_ctrl & TRANCTRL_STARTED) && obj->i2c.tran_pos) {
<> 149:156823d33999 768 if (obj->i2c.tran_pos < obj->i2c.tran_end) {
<> 149:156823d33999 769 if (status == 0x90 || status == 0x98) {
<> 149:156823d33999 770 *obj->i2c.tran_pos ++ = I2C_GET_DATA(i2c_base);
<> 149:156823d33999 771 }
<> 149:156823d33999 772
<> 149:156823d33999 773 if (status == 0x98) {
<> 149:156823d33999 774 #if NU_I2C_DEBUG
<> 149:156823d33999 775 if (obj->i2c.tran_pos != obj->i2c.tran_end) {
<> 149:156823d33999 776 MY_I2C = obj->i2c;
<> 149:156823d33999 777 while (1);
<> 149:156823d33999 778 }
<> 149:156823d33999 779 #endif
<> 149:156823d33999 780 obj->i2c.slaveaddr_state = NoData;
<> 149:156823d33999 781 i2c_fsm_reset(obj, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
<> 149:156823d33999 782 }
<> 149:156823d33999 783 else {
<> 149:156823d33999 784 uint32_t i2c_ctl = I2C_CTL_SI_Msk | I2C_CTL_AA_Msk;
<> 149:156823d33999 785 if ((obj->i2c.tran_end - obj->i2c.tran_pos) == 1 &&
<> 149:156823d33999 786 obj->i2c.tran_ctrl & TRANCTRL_NAKLASTDATA) {
<> 149:156823d33999 787 // Last data
<> 149:156823d33999 788 i2c_ctl &= ~I2C_CTL_AA_Msk;
<> 149:156823d33999 789 }
<> 149:156823d33999 790 I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
<> 149:156823d33999 791 }
<> 149:156823d33999 792 }
<> 149:156823d33999 793 else {
<> 149:156823d33999 794 obj->i2c.tran_ctrl &= ~TRANCTRL_STARTED;
<> 149:156823d33999 795 i2c_disable_int(obj);
<> 149:156823d33999 796 break;
<> 149:156823d33999 797 }
<> 149:156823d33999 798 }
<> 149:156823d33999 799 else {
<> 149:156823d33999 800 i2c_disable_int(obj);
<> 149:156823d33999 801 }
<> 149:156823d33999 802 break;
<> 149:156823d33999 803
<> 149:156823d33999 804 case 0xF8: // Bus Released
<> 149:156823d33999 805 break;
<> 149:156823d33999 806
<> 149:156823d33999 807 default:
<> 149:156823d33999 808 i2c_fsm_reset(obj, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
<> 149:156823d33999 809 }
<> 149:156823d33999 810 }
<> 149:156823d33999 811
<> 149:156823d33999 812 static void i2c_fsm_reset(i2c_t *obj, uint32_t i2c_ctl)
<> 149:156823d33999 813 {
<> 149:156823d33999 814 I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
<> 149:156823d33999 815
<> 149:156823d33999 816 obj->i2c.stop = 0;
<> 149:156823d33999 817
<> 149:156823d33999 818 obj->i2c.tran_ctrl = 0;
<> 149:156823d33999 819
<> 149:156823d33999 820 I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
<> 149:156823d33999 821 obj->i2c.slaveaddr_state = NoData;
<> 149:156823d33999 822 }
<> 149:156823d33999 823
<> 149:156823d33999 824 #if DEVICE_I2C_ASYNCH
<> 149:156823d33999 825
<> 149:156823d33999 826 void i2c_transfer_asynch(i2c_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint32_t address, uint32_t stop, uint32_t handler, uint32_t event, DMAUsage hint)
<> 149:156823d33999 827 {
<> 149:156823d33999 828 // NOTE: M451 I2C only supports 7-bit slave address. The mbed I2C address passed in is shifted left by 1 bit (7-bit addr << 1).
<> 149:156823d33999 829 MBED_ASSERT((address & 0xFFFFFF00) == 0);
<> 149:156823d33999 830
<> 149:156823d33999 831 // NOTE: First transmit and then receive.
<> 149:156823d33999 832
<> 149:156823d33999 833 (void) hint;
<> 149:156823d33999 834 obj->i2c.dma_usage = DMA_USAGE_NEVER;
<> 149:156823d33999 835 obj->i2c.stop = stop;
<> 149:156823d33999 836 obj->i2c.address = address;
<> 149:156823d33999 837 obj->i2c.event = event;
<> 149:156823d33999 838 i2c_buffer_set(obj, tx, tx_length, rx, rx_length);
<> 149:156823d33999 839
<> 149:156823d33999 840 //I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
<> 149:156823d33999 841
<> 149:156823d33999 842 i2c_enable_vector_interrupt(obj, handler, 1);
<> 149:156823d33999 843 i2c_start(obj);
<> 149:156823d33999 844 }
<> 149:156823d33999 845
<> 149:156823d33999 846 uint32_t i2c_irq_handler_asynch(i2c_t *obj)
<> 149:156823d33999 847 {
<> 149:156823d33999 848 int event = 0;
<> 149:156823d33999 849
<> 149:156823d33999 850 I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
<> 149:156823d33999 851 uint32_t status = I2C_GET_STATUS(i2c_base);
<> 149:156823d33999 852 switch (status) {
<> 149:156823d33999 853 case 0x08: // Start
<> 149:156823d33999 854 case 0x10: {// Master Repeat Start
<> 149:156823d33999 855 if (obj->tx_buff.buffer && obj->tx_buff.pos < obj->tx_buff.length) {
<> 149:156823d33999 856 I2C_SET_DATA(i2c_base, (i2c_addr2data(obj->i2c.address, 0)));
<> 149:156823d33999 857 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk);
<> 149:156823d33999 858 }
<> 149:156823d33999 859 else if (obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) {
<> 149:156823d33999 860 I2C_SET_DATA(i2c_base, (i2c_addr2data(obj->i2c.address, 1)));
<> 149:156823d33999 861 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk);
<> 149:156823d33999 862 }
<> 149:156823d33999 863 else {
<> 149:156823d33999 864 event = I2C_EVENT_TRANSFER_COMPLETE;
<> 149:156823d33999 865 if (obj->i2c.stop) {
<> 149:156823d33999 866 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 867 }
<> 149:156823d33999 868 }
<> 149:156823d33999 869 break;
<> 149:156823d33999 870 }
<> 149:156823d33999 871
<> 149:156823d33999 872 case 0x18: // Master Transmit Address ACK
<> 149:156823d33999 873 case 0x28: // Master Transmit Data ACK
<> 149:156823d33999 874 if (obj->tx_buff.buffer && obj->tx_buff.pos < obj->tx_buff.length) {
<> 149:156823d33999 875 uint8_t *tx = (uint8_t *)obj->tx_buff.buffer;
<> 149:156823d33999 876 I2C_SET_DATA(i2c_base, tx[obj->tx_buff.pos ++]);
<> 149:156823d33999 877 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk);
<> 149:156823d33999 878 }
<> 149:156823d33999 879 else if (obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) {
<> 149:156823d33999 880 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 881 }
<> 149:156823d33999 882 else {
<> 149:156823d33999 883 event = I2C_EVENT_TRANSFER_COMPLETE;
<> 149:156823d33999 884 if (obj->i2c.stop) {
<> 149:156823d33999 885 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 886 }
<> 149:156823d33999 887 }
<> 149:156823d33999 888 break;
<> 149:156823d33999 889
<> 149:156823d33999 890 case 0x20: // Master Transmit Address NACK
<> 149:156823d33999 891 event = I2C_EVENT_ERROR_NO_SLAVE;
<> 149:156823d33999 892 if (obj->i2c.stop) {
<> 149:156823d33999 893 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 894 }
<> 149:156823d33999 895 break;
<> 149:156823d33999 896
<> 149:156823d33999 897 case 0x30: // Master Transmit Data NACK
<> 149:156823d33999 898 if (obj->tx_buff.buffer && obj->tx_buff.pos < obj->tx_buff.length) {
<> 149:156823d33999 899 event = I2C_EVENT_TRANSFER_EARLY_NACK;
<> 149:156823d33999 900 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 901 }
<> 149:156823d33999 902 else if (obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) {
<> 149:156823d33999 903 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 904 }
<> 149:156823d33999 905 else {
<> 149:156823d33999 906 event = I2C_EVENT_TRANSFER_COMPLETE;
<> 149:156823d33999 907 if (obj->i2c.stop) {
<> 149:156823d33999 908 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 909 }
<> 149:156823d33999 910 }
<> 149:156823d33999 911 break;
<> 149:156823d33999 912
<> 149:156823d33999 913 case 0x38: // Master Arbitration Lost
<> 149:156823d33999 914 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk); // Enter not addressed SLV mode
<> 149:156823d33999 915 event = I2C_EVENT_ERROR;
<> 149:156823d33999 916 break;
<> 149:156823d33999 917
<> 149:156823d33999 918 case 0x50: // Master Receive Data ACK
<> 149:156823d33999 919 if (obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) {
<> 149:156823d33999 920 uint8_t *rx = (uint8_t *) obj->rx_buff.buffer;
<> 149:156823d33999 921 rx[obj->rx_buff.pos ++] = I2C_GET_DATA(((I2C_T *) NU_MODBASE(obj->i2c.i2c)));
<> 149:156823d33999 922 }
<> 149:156823d33999 923 case 0x40: // Master Receive Address ACK
<> 149:156823d33999 924 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk | ((obj->rx_buff.pos != obj->rx_buff.length - 1) ? I2C_CTL_AA_Msk : 0));
<> 149:156823d33999 925 break;
<> 149:156823d33999 926
<> 149:156823d33999 927 case 0x48: // Master Receive Address NACK
<> 149:156823d33999 928 event = I2C_EVENT_ERROR_NO_SLAVE;
<> 149:156823d33999 929 if (obj->i2c.stop) {
<> 149:156823d33999 930 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 931 }
<> 149:156823d33999 932 break;
<> 149:156823d33999 933
<> 149:156823d33999 934 case 0x58: // Master Receive Data NACK
<> 149:156823d33999 935 if (obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) {
<> 149:156823d33999 936 uint8_t *rx = (uint8_t *) obj->rx_buff.buffer;
<> 149:156823d33999 937 rx[obj->rx_buff.pos ++] = I2C_GET_DATA(((I2C_T *) NU_MODBASE(obj->i2c.i2c)));
<> 149:156823d33999 938 }
<> 149:156823d33999 939 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 940 break;
<> 149:156823d33999 941
<> 149:156823d33999 942 case 0x00: // Bus error
<> 149:156823d33999 943 event = I2C_EVENT_ERROR;
<> 149:156823d33999 944 i2c_reset(obj);
<> 149:156823d33999 945 break;
<> 149:156823d33999 946
<> 149:156823d33999 947 default:
<> 149:156823d33999 948 event = I2C_EVENT_ERROR;
<> 149:156823d33999 949 if (obj->i2c.stop) {
<> 149:156823d33999 950 I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
<> 149:156823d33999 951 }
<> 149:156823d33999 952 }
<> 149:156823d33999 953
<> 149:156823d33999 954 if (event) {
<> 149:156823d33999 955 i2c_rollback_vector_interrupt(obj);
<> 149:156823d33999 956 }
<> 149:156823d33999 957
<> 149:156823d33999 958 return (event & obj->i2c.event);
<> 149:156823d33999 959 }
<> 149:156823d33999 960
<> 149:156823d33999 961 uint8_t i2c_active(i2c_t *obj)
<> 149:156823d33999 962 {
<> 149:156823d33999 963 const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
<> 149:156823d33999 964 MBED_ASSERT(modinit != NULL);
<> 149:156823d33999 965 MBED_ASSERT(modinit->modname == obj->i2c.i2c);
<> 149:156823d33999 966
<> 149:156823d33999 967 // Vector will be changed for async transfer. Use it to judge if async transfer is on-going.
<> 149:156823d33999 968 uint32_t vec = NVIC_GetVector(modinit->irq_n);
<> 149:156823d33999 969 struct nu_i2c_var *var = (struct nu_i2c_var *) modinit->var;
<> 149:156823d33999 970 return (vec && vec != (uint32_t) var->vec);
<> 149:156823d33999 971 }
<> 149:156823d33999 972
<> 149:156823d33999 973 void i2c_abort_asynch(i2c_t *obj)
<> 149:156823d33999 974 {
<> 149:156823d33999 975 i2c_rollback_vector_interrupt(obj);
<> 149:156823d33999 976 i2c_stop(obj);
<> 149:156823d33999 977 }
<> 149:156823d33999 978
<> 149:156823d33999 979 static void i2c_buffer_set(i2c_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length)
<> 149:156823d33999 980 {
<> 149:156823d33999 981 obj->tx_buff.buffer = (void *) tx;
<> 149:156823d33999 982 obj->tx_buff.length = tx_length;
<> 149:156823d33999 983 obj->tx_buff.pos = 0;
<> 149:156823d33999 984 obj->rx_buff.buffer = rx;
<> 149:156823d33999 985 obj->rx_buff.length = rx_length;
<> 149:156823d33999 986 obj->rx_buff.pos = 0;
<> 149:156823d33999 987 }
<> 149:156823d33999 988
<> 149:156823d33999 989 static void i2c_enable_vector_interrupt(i2c_t *obj, uint32_t handler, int enable)
<> 149:156823d33999 990 {
<> 149:156823d33999 991 const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
<> 149:156823d33999 992 MBED_ASSERT(modinit != NULL);
<> 149:156823d33999 993 MBED_ASSERT(modinit->modname == obj->i2c.i2c);
<> 149:156823d33999 994
<> 149:156823d33999 995 if (enable) {
<> 149:156823d33999 996 NVIC_SetVector(modinit->irq_n, handler);
<> 149:156823d33999 997 i2c_enable_int(obj);
<> 149:156823d33999 998 }
<> 149:156823d33999 999 else {
<> 149:156823d33999 1000 i2c_disable_int(obj);
<> 149:156823d33999 1001 }
<> 149:156823d33999 1002
<> 149:156823d33999 1003 }
<> 149:156823d33999 1004
<> 149:156823d33999 1005 static void i2c_rollback_vector_interrupt(i2c_t *obj)
<> 149:156823d33999 1006 {
<> 149:156823d33999 1007 const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
<> 149:156823d33999 1008 MBED_ASSERT(modinit != NULL);
<> 149:156823d33999 1009 MBED_ASSERT(modinit->modname == obj->i2c.i2c);
<> 149:156823d33999 1010
<> 149:156823d33999 1011 struct nu_i2c_var *var = (struct nu_i2c_var *) modinit->var;
<> 149:156823d33999 1012 i2c_enable_vector_interrupt(obj, (uint32_t) var->vec, 1);
<> 149:156823d33999 1013 }
<> 149:156823d33999 1014
<> 149:156823d33999 1015 #endif
<> 149:156823d33999 1016
<> 149:156823d33999 1017 #endif