mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_TOSHIBA/TARGET_TMPM46B/i2c_api.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
184:08ed48f1de7f 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 184:08ed48f1de7f 1 /* mbed Microcontroller Library
AnnaBridge 184:08ed48f1de7f 2 * (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2017 All rights reserved
AnnaBridge 184:08ed48f1de7f 3 *
AnnaBridge 184:08ed48f1de7f 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 184:08ed48f1de7f 5 * you may not use this file except in compliance with the License.
AnnaBridge 184:08ed48f1de7f 6 * You may obtain a copy of the License at
AnnaBridge 184:08ed48f1de7f 7 *
AnnaBridge 184:08ed48f1de7f 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 184:08ed48f1de7f 9 *
AnnaBridge 184:08ed48f1de7f 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 184:08ed48f1de7f 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 184:08ed48f1de7f 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 184:08ed48f1de7f 13 * See the License for the specific language governing permissions and
AnnaBridge 184:08ed48f1de7f 14 * limitations under the License.
AnnaBridge 184:08ed48f1de7f 15 */
AnnaBridge 184:08ed48f1de7f 16 #include "i2c_api.h"
AnnaBridge 184:08ed48f1de7f 17 #include "mbed_error.h"
AnnaBridge 184:08ed48f1de7f 18 #include "PeripheralNames.h"
AnnaBridge 184:08ed48f1de7f 19 #include "pinmap.h"
AnnaBridge 184:08ed48f1de7f 20 #include "tmpm46b_i2c.h"
AnnaBridge 184:08ed48f1de7f 21 #include <string.h>
AnnaBridge 184:08ed48f1de7f 22 #include <stdlib.h>
AnnaBridge 184:08ed48f1de7f 23
AnnaBridge 184:08ed48f1de7f 24 static const PinMap PinMap_I2C_SDA[] = {
AnnaBridge 184:08ed48f1de7f 25 {PK2, I2C_0, PIN_DATA(3, 2)},
AnnaBridge 184:08ed48f1de7f 26 {PF7, I2C_1, PIN_DATA(4, 2)},
AnnaBridge 184:08ed48f1de7f 27 {PH0, I2C_2, PIN_DATA(4, 2)},
AnnaBridge 184:08ed48f1de7f 28 {NC, NC, 0}
AnnaBridge 184:08ed48f1de7f 29 };
AnnaBridge 184:08ed48f1de7f 30
AnnaBridge 184:08ed48f1de7f 31 static const PinMap PinMap_I2C_SCL[] = {
AnnaBridge 184:08ed48f1de7f 32 {PK3, I2C_0, PIN_DATA(3, 2)},
AnnaBridge 184:08ed48f1de7f 33 {PF6, I2C_1, PIN_DATA(4, 2)},
AnnaBridge 184:08ed48f1de7f 34 {PH1, I2C_2, PIN_DATA(4, 2)},
AnnaBridge 184:08ed48f1de7f 35 {NC, NC, 0}
AnnaBridge 184:08ed48f1de7f 36 };
AnnaBridge 184:08ed48f1de7f 37
AnnaBridge 184:08ed48f1de7f 38 #define SBI_I2C_SEND 0x00
AnnaBridge 184:08ed48f1de7f 39 #define SBI_I2C_RECEIVE 0x01
AnnaBridge 184:08ed48f1de7f 40 #define MAX_NUM_I2C 3
AnnaBridge 184:08ed48f1de7f 41 #define DELAY_MS_MULTIPLIER 5500
AnnaBridge 184:08ed48f1de7f 42
AnnaBridge 184:08ed48f1de7f 43 struct i2c_xfer {
AnnaBridge 184:08ed48f1de7f 44 int32_t count;
AnnaBridge 184:08ed48f1de7f 45 int32_t len;
AnnaBridge 184:08ed48f1de7f 46 void *done;
AnnaBridge 184:08ed48f1de7f 47 char *buf;
AnnaBridge 184:08ed48f1de7f 48 };
AnnaBridge 184:08ed48f1de7f 49
AnnaBridge 184:08ed48f1de7f 50 // Clock setting structure definition
AnnaBridge 184:08ed48f1de7f 51 typedef struct {
AnnaBridge 184:08ed48f1de7f 52 uint32_t sck;
AnnaBridge 184:08ed48f1de7f 53 uint32_t prsck;
AnnaBridge 184:08ed48f1de7f 54 } I2C_clock_setting_t;
AnnaBridge 184:08ed48f1de7f 55
AnnaBridge 184:08ed48f1de7f 56 static void DelayMS(uint32_t delay)
AnnaBridge 184:08ed48f1de7f 57 {
AnnaBridge 184:08ed48f1de7f 58 volatile uint32_t VarI;
AnnaBridge 184:08ed48f1de7f 59 for (VarI = 0; VarI < delay * DELAY_MS_MULTIPLIER; VarI++);
AnnaBridge 184:08ed48f1de7f 60 }
AnnaBridge 184:08ed48f1de7f 61
AnnaBridge 184:08ed48f1de7f 62 static const uint32_t I2C_SCK_DIVIDER_TBL[8] = {
AnnaBridge 184:08ed48f1de7f 63 20, 24, 32, 48, 80, 144, 272, 528
AnnaBridge 184:08ed48f1de7f 64 }; // SCK Divider value table
AnnaBridge 184:08ed48f1de7f 65
AnnaBridge 184:08ed48f1de7f 66 static I2C_clock_setting_t clk;
AnnaBridge 184:08ed48f1de7f 67 static I2C_InitTypeDef myi2c;
AnnaBridge 184:08ed48f1de7f 68 static int32_t start_flag = 1;
AnnaBridge 184:08ed48f1de7f 69 static struct i2c_xfer xfer[MAX_NUM_I2C];
AnnaBridge 184:08ed48f1de7f 70 static TSB_I2C_TypeDef *i2c_lut[MAX_NUM_I2C] = {TSB_I2C0, TSB_I2C1, TSB_I2C2};
AnnaBridge 184:08ed48f1de7f 71 static char *gI2C_TxData = NULL;
AnnaBridge 184:08ed48f1de7f 72 static char *gI2C_LTxData = NULL;
AnnaBridge 184:08ed48f1de7f 73 static uint8_t send_byte = 0;
AnnaBridge 184:08ed48f1de7f 74 static uint8_t byte_func = 0;
AnnaBridge 184:08ed48f1de7f 75
AnnaBridge 184:08ed48f1de7f 76 // Initialize the I2C peripheral. It sets the default parameters for I2C
AnnaBridge 184:08ed48f1de7f 77 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
AnnaBridge 184:08ed48f1de7f 78 {
AnnaBridge 184:08ed48f1de7f 79 MBED_ASSERT(obj != NULL);
AnnaBridge 184:08ed48f1de7f 80 I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
AnnaBridge 184:08ed48f1de7f 81 I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
AnnaBridge 184:08ed48f1de7f 82 I2CName i2c_name = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
AnnaBridge 184:08ed48f1de7f 83 MBED_ASSERT((int)i2c_name != NC);
AnnaBridge 184:08ed48f1de7f 84
AnnaBridge 184:08ed48f1de7f 85 switch(i2c_name) {
AnnaBridge 184:08ed48f1de7f 86 case I2C_0:
AnnaBridge 184:08ed48f1de7f 87 CG_SetFcPeriphB(CG_FC_PERIPH_I2C0, ENABLE);
AnnaBridge 184:08ed48f1de7f 88 CG_SetFcPeriphA(CG_FC_PERIPH_PORTK, ENABLE);
AnnaBridge 184:08ed48f1de7f 89 obj->i2c = TSB_I2C0;
AnnaBridge 184:08ed48f1de7f 90 obj->index = 0;
AnnaBridge 184:08ed48f1de7f 91 obj->IRQn = INTI2C0_IRQn;
AnnaBridge 184:08ed48f1de7f 92 break;
AnnaBridge 184:08ed48f1de7f 93 case I2C_1:
AnnaBridge 184:08ed48f1de7f 94 CG_SetFcPeriphB(CG_FC_PERIPH_I2C1, ENABLE);
AnnaBridge 184:08ed48f1de7f 95 CG_SetFcPeriphA(CG_FC_PERIPH_PORTF, ENABLE);
AnnaBridge 184:08ed48f1de7f 96 obj->i2c = TSB_I2C1;
AnnaBridge 184:08ed48f1de7f 97 obj->index = 1;
AnnaBridge 184:08ed48f1de7f 98 obj->IRQn = INTI2C1_IRQn;
AnnaBridge 184:08ed48f1de7f 99 break;
AnnaBridge 184:08ed48f1de7f 100 case I2C_2:
AnnaBridge 184:08ed48f1de7f 101 CG_SetFcPeriphB(CG_FC_PERIPH_I2C2, ENABLE);
AnnaBridge 184:08ed48f1de7f 102 CG_SetFcPeriphA(CG_FC_PERIPH_PORTH, ENABLE);
AnnaBridge 184:08ed48f1de7f 103 obj->i2c = TSB_I2C2;
AnnaBridge 184:08ed48f1de7f 104 obj->index = 2;
AnnaBridge 184:08ed48f1de7f 105 obj->IRQn = INTI2C2_IRQn;
AnnaBridge 184:08ed48f1de7f 106 break;
AnnaBridge 184:08ed48f1de7f 107 default:
AnnaBridge 184:08ed48f1de7f 108 error("I2C is not available");
AnnaBridge 184:08ed48f1de7f 109 break;
AnnaBridge 184:08ed48f1de7f 110 }
AnnaBridge 184:08ed48f1de7f 111
AnnaBridge 184:08ed48f1de7f 112 pinmap_pinout(sda, PinMap_I2C_SDA);
AnnaBridge 184:08ed48f1de7f 113 pin_mode(sda, OpenDrain);
AnnaBridge 184:08ed48f1de7f 114 pin_mode(sda, PullUp);
AnnaBridge 184:08ed48f1de7f 115
AnnaBridge 184:08ed48f1de7f 116 pinmap_pinout(scl, PinMap_I2C_SCL);
AnnaBridge 184:08ed48f1de7f 117 pin_mode(scl, OpenDrain);
AnnaBridge 184:08ed48f1de7f 118 pin_mode(scl, PullUp);
AnnaBridge 184:08ed48f1de7f 119
AnnaBridge 184:08ed48f1de7f 120 i2c_reset(obj);
AnnaBridge 184:08ed48f1de7f 121 i2c_frequency(obj, 100000);
AnnaBridge 184:08ed48f1de7f 122 }
AnnaBridge 184:08ed48f1de7f 123
AnnaBridge 184:08ed48f1de7f 124 // Configure the I2C frequency
AnnaBridge 184:08ed48f1de7f 125 void i2c_frequency(i2c_t *obj, int hz)
AnnaBridge 184:08ed48f1de7f 126 {
AnnaBridge 184:08ed48f1de7f 127 uint32_t sck = 0;
AnnaBridge 184:08ed48f1de7f 128 uint32_t tmp_sck = 0;
AnnaBridge 184:08ed48f1de7f 129 uint32_t prsck = 1;
AnnaBridge 184:08ed48f1de7f 130 uint32_t tmp_prsck = 1;
AnnaBridge 184:08ed48f1de7f 131 uint32_t fscl = 0;
AnnaBridge 184:08ed48f1de7f 132 uint32_t tmp_fscl = 0;
AnnaBridge 184:08ed48f1de7f 133 uint64_t fx;
AnnaBridge 184:08ed48f1de7f 134
AnnaBridge 184:08ed48f1de7f 135 if (hz <= 400000) { // Maximum 400khz clock frequency supported by M46B
AnnaBridge 184:08ed48f1de7f 136 for (prsck = 1; prsck <= 32; prsck++) {
AnnaBridge 184:08ed48f1de7f 137 fx = ((uint64_t)SystemCoreClock / prsck);
AnnaBridge 184:08ed48f1de7f 138 if ((fx < 20000000U) && (fx > 6666666U)) {
AnnaBridge 184:08ed48f1de7f 139 for (sck = 0; sck <= 7; sck++) {
AnnaBridge 184:08ed48f1de7f 140 fscl = (fx / (uint64_t)I2C_SCK_DIVIDER_TBL[sck]);
AnnaBridge 184:08ed48f1de7f 141 if ((fscl <= (uint64_t)hz) && (fscl > tmp_fscl)) {
AnnaBridge 184:08ed48f1de7f 142 tmp_fscl = fscl;
AnnaBridge 184:08ed48f1de7f 143 tmp_sck = sck;
AnnaBridge 184:08ed48f1de7f 144 tmp_prsck = (prsck < 32)? prsck: 1;
AnnaBridge 184:08ed48f1de7f 145 }
AnnaBridge 184:08ed48f1de7f 146 }
AnnaBridge 184:08ed48f1de7f 147 }
AnnaBridge 184:08ed48f1de7f 148 }
AnnaBridge 184:08ed48f1de7f 149 clk.sck = (uint32_t)tmp_sck;
AnnaBridge 184:08ed48f1de7f 150 clk.prsck = (tmp_prsck < 32)? (uint32_t)tmp_prsck - 1 : 1;
AnnaBridge 184:08ed48f1de7f 151 } else {
AnnaBridge 184:08ed48f1de7f 152 clk.sck = I2C_SCK_CLK_DIV_24;
AnnaBridge 184:08ed48f1de7f 153 clk.prsck = I2C_PRESCALER_DIV_4;
AnnaBridge 184:08ed48f1de7f 154 }
AnnaBridge 184:08ed48f1de7f 155 myi2c.I2CSelfAddr = 0xE0; // Self Address
AnnaBridge 184:08ed48f1de7f 156 myi2c.I2CDataLen = I2C_DATA_LEN_8;
AnnaBridge 184:08ed48f1de7f 157 myi2c.I2CACKState = ENABLE;
AnnaBridge 184:08ed48f1de7f 158 myi2c.I2CClkDiv = clk.sck;
AnnaBridge 184:08ed48f1de7f 159 myi2c.PrescalerClkDiv = clk.prsck;
AnnaBridge 184:08ed48f1de7f 160
AnnaBridge 184:08ed48f1de7f 161 I2C_SWReset(obj->i2c);
AnnaBridge 184:08ed48f1de7f 162 I2C_Init(obj->i2c, &myi2c);
AnnaBridge 184:08ed48f1de7f 163 NVIC_EnableIRQ(obj->IRQn);
AnnaBridge 184:08ed48f1de7f 164 I2C_SetINTReq(obj->i2c, ENABLE);
AnnaBridge 184:08ed48f1de7f 165 }
AnnaBridge 184:08ed48f1de7f 166
AnnaBridge 184:08ed48f1de7f 167 int i2c_start(i2c_t *obj)
AnnaBridge 184:08ed48f1de7f 168 {
AnnaBridge 184:08ed48f1de7f 169 start_flag = 1;
AnnaBridge 184:08ed48f1de7f 170 return 0;
AnnaBridge 184:08ed48f1de7f 171 }
AnnaBridge 184:08ed48f1de7f 172
AnnaBridge 184:08ed48f1de7f 173 int i2c_stop(i2c_t *obj)
AnnaBridge 184:08ed48f1de7f 174 {
AnnaBridge 184:08ed48f1de7f 175 I2C_GenerateStop(obj->i2c);
AnnaBridge 184:08ed48f1de7f 176 return 0;
AnnaBridge 184:08ed48f1de7f 177 }
AnnaBridge 184:08ed48f1de7f 178
AnnaBridge 184:08ed48f1de7f 179 void i2c_reset(i2c_t *obj)
AnnaBridge 184:08ed48f1de7f 180 {
AnnaBridge 184:08ed48f1de7f 181 I2C_SWReset(obj->i2c);
AnnaBridge 184:08ed48f1de7f 182 }
AnnaBridge 184:08ed48f1de7f 183
AnnaBridge 184:08ed48f1de7f 184 static void wait_i2c_bus_free(i2c_t *obj)
AnnaBridge 184:08ed48f1de7f 185 {
AnnaBridge 184:08ed48f1de7f 186 I2C_State status;
AnnaBridge 184:08ed48f1de7f 187
AnnaBridge 184:08ed48f1de7f 188 do {
AnnaBridge 184:08ed48f1de7f 189 status = I2C_GetState(obj->i2c);
AnnaBridge 184:08ed48f1de7f 190 } while (status.Bit.BusState);
AnnaBridge 184:08ed48f1de7f 191 }
AnnaBridge 184:08ed48f1de7f 192
AnnaBridge 184:08ed48f1de7f 193 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
AnnaBridge 184:08ed48f1de7f 194 {
AnnaBridge 184:08ed48f1de7f 195 TSB_I2C_TypeDef *sbi = obj->i2c;
AnnaBridge 184:08ed48f1de7f 196 uint32_t i2c_num = 0;
AnnaBridge 184:08ed48f1de7f 197 obj->address = address;
AnnaBridge 184:08ed48f1de7f 198
AnnaBridge 184:08ed48f1de7f 199 i2c_num = obj->index;
AnnaBridge 184:08ed48f1de7f 200
AnnaBridge 184:08ed48f1de7f 201 // receive data
AnnaBridge 184:08ed48f1de7f 202 xfer[i2c_num].count = 0;
AnnaBridge 184:08ed48f1de7f 203 xfer[i2c_num].len = length;
AnnaBridge 184:08ed48f1de7f 204 xfer[i2c_num].buf = data;
AnnaBridge 184:08ed48f1de7f 205
AnnaBridge 184:08ed48f1de7f 206 I2C_SetSendData(sbi, address | SBI_I2C_RECEIVE);
AnnaBridge 184:08ed48f1de7f 207 I2C_GenerateStart(sbi);
AnnaBridge 184:08ed48f1de7f 208
AnnaBridge 184:08ed48f1de7f 209 wait_i2c_bus_free(obj);
AnnaBridge 184:08ed48f1de7f 210 return (xfer[i2c_num].count - 1);
AnnaBridge 184:08ed48f1de7f 211 }
AnnaBridge 184:08ed48f1de7f 212
AnnaBridge 184:08ed48f1de7f 213 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
AnnaBridge 184:08ed48f1de7f 214 {
AnnaBridge 184:08ed48f1de7f 215 int8_t i = 0;
AnnaBridge 184:08ed48f1de7f 216 TSB_I2C_TypeDef *sbi = obj->i2c;
AnnaBridge 184:08ed48f1de7f 217 uint32_t i2c_num = 0;
AnnaBridge 184:08ed48f1de7f 218 obj->address = address;
AnnaBridge 184:08ed48f1de7f 219
AnnaBridge 184:08ed48f1de7f 220 i2c_num = obj->index;
AnnaBridge 184:08ed48f1de7f 221 gI2C_TxData = (char *)calloc(length, sizeof(int8_t));
AnnaBridge 184:08ed48f1de7f 222
AnnaBridge 184:08ed48f1de7f 223 for (i = 0; i < length; i++) {
AnnaBridge 184:08ed48f1de7f 224 gI2C_TxData[i] = data[i];
AnnaBridge 184:08ed48f1de7f 225 }
AnnaBridge 184:08ed48f1de7f 226 // receive data
AnnaBridge 184:08ed48f1de7f 227 xfer[i2c_num].count = 0;
AnnaBridge 184:08ed48f1de7f 228 xfer[i2c_num].len = length;
AnnaBridge 184:08ed48f1de7f 229 xfer[i2c_num].buf = gI2C_TxData;
AnnaBridge 184:08ed48f1de7f 230
AnnaBridge 184:08ed48f1de7f 231 I2C_SetSendData(sbi, address | SBI_I2C_SEND);
AnnaBridge 184:08ed48f1de7f 232 I2C_GenerateStart(sbi); // Start condition
AnnaBridge 184:08ed48f1de7f 233
AnnaBridge 184:08ed48f1de7f 234 wait_i2c_bus_free(obj);
AnnaBridge 184:08ed48f1de7f 235 free(gI2C_TxData);
AnnaBridge 184:08ed48f1de7f 236 DelayMS(8);
AnnaBridge 184:08ed48f1de7f 237 if (((xfer[i2c_num].count - 1) == 0) && (byte_func == 1)) {
AnnaBridge 184:08ed48f1de7f 238 send_byte = 1;
AnnaBridge 184:08ed48f1de7f 239 i2c_byte_write(obj, 0x00);
AnnaBridge 184:08ed48f1de7f 240 xfer[i2c_num].count = 1;
AnnaBridge 184:08ed48f1de7f 241 byte_func = 0;
AnnaBridge 184:08ed48f1de7f 242 }
AnnaBridge 184:08ed48f1de7f 243 return (xfer[i2c_num].count - 1);
AnnaBridge 184:08ed48f1de7f 244 }
AnnaBridge 184:08ed48f1de7f 245
AnnaBridge 184:08ed48f1de7f 246 int i2c_byte_read(i2c_t *obj, int last)
AnnaBridge 184:08ed48f1de7f 247 {
AnnaBridge 184:08ed48f1de7f 248 char i2c_ret = 0;
AnnaBridge 184:08ed48f1de7f 249 i2c_read(obj, obj->address, &i2c_ret, 1, last);
AnnaBridge 184:08ed48f1de7f 250 return i2c_ret;
AnnaBridge 184:08ed48f1de7f 251 }
AnnaBridge 184:08ed48f1de7f 252
AnnaBridge 184:08ed48f1de7f 253 int i2c_byte_write(i2c_t *obj, int data)
AnnaBridge 184:08ed48f1de7f 254 {
AnnaBridge 184:08ed48f1de7f 255 uint32_t wb = 1;
AnnaBridge 184:08ed48f1de7f 256 static size_t counter = 1;
AnnaBridge 184:08ed48f1de7f 257
AnnaBridge 184:08ed48f1de7f 258 byte_func = 1;
AnnaBridge 184:08ed48f1de7f 259 if (start_flag == 0 && send_byte == 0) {
AnnaBridge 184:08ed48f1de7f 260 gI2C_LTxData = (char *)realloc(gI2C_LTxData, counter++);
AnnaBridge 184:08ed48f1de7f 261 gI2C_LTxData[counter - 2] = data;
AnnaBridge 184:08ed48f1de7f 262 }
AnnaBridge 184:08ed48f1de7f 263
AnnaBridge 184:08ed48f1de7f 264 if (send_byte == 1) {
AnnaBridge 184:08ed48f1de7f 265 wb = i2c_write(obj, obj->address, gI2C_LTxData, (counter - 1), 0);
AnnaBridge 184:08ed48f1de7f 266 start_flag = 1;
AnnaBridge 184:08ed48f1de7f 267 send_byte = 0;
AnnaBridge 184:08ed48f1de7f 268 byte_func = 0;
AnnaBridge 184:08ed48f1de7f 269 counter = 1;
AnnaBridge 184:08ed48f1de7f 270 return wb;
AnnaBridge 184:08ed48f1de7f 271 } else {
AnnaBridge 184:08ed48f1de7f 272 if (start_flag == 1) {
AnnaBridge 184:08ed48f1de7f 273 obj->address = data;
AnnaBridge 184:08ed48f1de7f 274 start_flag = 0;
AnnaBridge 184:08ed48f1de7f 275 } else {
AnnaBridge 184:08ed48f1de7f 276 // Store the number of written bytes
AnnaBridge 184:08ed48f1de7f 277 wb = i2c_write(obj, obj->address, (char*)&data, 1, 0);
AnnaBridge 184:08ed48f1de7f 278 }
AnnaBridge 184:08ed48f1de7f 279 if (wb == 1)
AnnaBridge 184:08ed48f1de7f 280 return 1;
AnnaBridge 184:08ed48f1de7f 281 else
AnnaBridge 184:08ed48f1de7f 282 return 0;
AnnaBridge 184:08ed48f1de7f 283 }
AnnaBridge 184:08ed48f1de7f 284 }
AnnaBridge 184:08ed48f1de7f 285
AnnaBridge 184:08ed48f1de7f 286 static void i2c_irq_handler(int i2c_num)
AnnaBridge 184:08ed48f1de7f 287 {
AnnaBridge 184:08ed48f1de7f 288 uint32_t tmp = 0U;
AnnaBridge 184:08ed48f1de7f 289 TSB_I2C_TypeDef *sbi = i2c_lut[i2c_num];
AnnaBridge 184:08ed48f1de7f 290 I2C_State sbi_sr;
AnnaBridge 184:08ed48f1de7f 291
AnnaBridge 184:08ed48f1de7f 292 sbi_sr = I2C_GetState(sbi);
AnnaBridge 184:08ed48f1de7f 293
AnnaBridge 184:08ed48f1de7f 294 // we don't support slave mode
AnnaBridge 184:08ed48f1de7f 295 if (!sbi_sr.Bit.MasterSlave)
AnnaBridge 184:08ed48f1de7f 296 return;
AnnaBridge 184:08ed48f1de7f 297
AnnaBridge 184:08ed48f1de7f 298 if (sbi_sr.Bit.TRx) { // Tx mode
AnnaBridge 184:08ed48f1de7f 299 if (sbi_sr.Bit.LastRxBit) { // LRB=1: the receiver requires no further data.
AnnaBridge 184:08ed48f1de7f 300 I2C_GenerateStop(sbi);
AnnaBridge 184:08ed48f1de7f 301 } else { // LRB=0: the receiver requires further data.
AnnaBridge 184:08ed48f1de7f 302 if (xfer[i2c_num].count < xfer[i2c_num].len) {
AnnaBridge 184:08ed48f1de7f 303 I2C_SetSendData(sbi, xfer[i2c_num].buf[xfer[i2c_num].count]); // Send next data
AnnaBridge 184:08ed48f1de7f 304 } else if (xfer[i2c_num].count == xfer[i2c_num].len) { // I2C data send finished.
AnnaBridge 184:08ed48f1de7f 305 I2C_GenerateStop(sbi);
AnnaBridge 184:08ed48f1de7f 306 } else {
AnnaBridge 184:08ed48f1de7f 307 // Do nothing
AnnaBridge 184:08ed48f1de7f 308 }
AnnaBridge 184:08ed48f1de7f 309 xfer[i2c_num].count++;
AnnaBridge 184:08ed48f1de7f 310 }
AnnaBridge 184:08ed48f1de7f 311 } else { // Rx Mode
AnnaBridge 184:08ed48f1de7f 312 if (xfer[i2c_num].count > xfer[i2c_num].len) {
AnnaBridge 184:08ed48f1de7f 313 I2C_GenerateStop(sbi);
AnnaBridge 184:08ed48f1de7f 314 I2C_SetACK(sbi, ENABLE);
AnnaBridge 184:08ed48f1de7f 315 } else {
AnnaBridge 184:08ed48f1de7f 316 if (xfer[i2c_num].count == xfer[i2c_num].len) { // Rx last data
AnnaBridge 184:08ed48f1de7f 317 I2C_SetBitNum(sbi, I2C_DATA_LEN_1);
AnnaBridge 184:08ed48f1de7f 318 } else if (xfer[i2c_num].count == (xfer[i2c_num].len - 1)) { // Rx the data second to last
AnnaBridge 184:08ed48f1de7f 319 // Not generate ACK for next data Rx end.
AnnaBridge 184:08ed48f1de7f 320 I2C_SetACK(sbi, DISABLE);
AnnaBridge 184:08ed48f1de7f 321 } else {
AnnaBridge 184:08ed48f1de7f 322 // Do nothing
AnnaBridge 184:08ed48f1de7f 323 }
AnnaBridge 184:08ed48f1de7f 324 tmp = I2C_GetReceiveData(sbi);
AnnaBridge 184:08ed48f1de7f 325 if (xfer[i2c_num].count > 0) {
AnnaBridge 184:08ed48f1de7f 326 xfer[i2c_num].buf[xfer[i2c_num].count - 1U] = tmp;
AnnaBridge 184:08ed48f1de7f 327 } else {
AnnaBridge 184:08ed48f1de7f 328 // first read is dummy read
AnnaBridge 184:08ed48f1de7f 329 }
AnnaBridge 184:08ed48f1de7f 330 xfer[i2c_num].count++;
AnnaBridge 184:08ed48f1de7f 331 }
AnnaBridge 184:08ed48f1de7f 332 }
AnnaBridge 184:08ed48f1de7f 333 }
AnnaBridge 184:08ed48f1de7f 334
AnnaBridge 184:08ed48f1de7f 335 void INTI2C0_IRQHandler(void)
AnnaBridge 184:08ed48f1de7f 336 {
AnnaBridge 184:08ed48f1de7f 337 i2c_irq_handler(0);
AnnaBridge 184:08ed48f1de7f 338 }
AnnaBridge 184:08ed48f1de7f 339
AnnaBridge 184:08ed48f1de7f 340 void INTI2C1_IRQHandler(void)
AnnaBridge 184:08ed48f1de7f 341 {
AnnaBridge 184:08ed48f1de7f 342 i2c_irq_handler(1);
AnnaBridge 184:08ed48f1de7f 343 }
AnnaBridge 184:08ed48f1de7f 344
AnnaBridge 184:08ed48f1de7f 345 void INTI2C2_IRQHandler(void)
AnnaBridge 184:08ed48f1de7f 346 {
AnnaBridge 184:08ed48f1de7f 347 i2c_irq_handler(2);
AnnaBridge 184:08ed48f1de7f 348 }