mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
targets/TARGET_TT/TARGET_TT_M3HQ/i2c_api.c@189:f392fc9709a3, 2019-02-20 (annotated)
- Committer:
- AnnaBridge
- Date:
- Wed Feb 20 22:31:08 2019 +0000
- Revision:
- 189:f392fc9709a3
mbed library release version 165
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
AnnaBridge | 189:f392fc9709a3 | 1 | /* mbed Microcontroller Library |
AnnaBridge | 189:f392fc9709a3 | 2 | * (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2018 All rights reserved |
AnnaBridge | 189:f392fc9709a3 | 3 | * SPDX-License-Identifier: Apache-2.0 |
AnnaBridge | 189:f392fc9709a3 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
AnnaBridge | 189:f392fc9709a3 | 5 | * you may not use this file except in compliance with the License. |
AnnaBridge | 189:f392fc9709a3 | 6 | * You may obtain a copy of the License at |
AnnaBridge | 189:f392fc9709a3 | 7 | * |
AnnaBridge | 189:f392fc9709a3 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
AnnaBridge | 189:f392fc9709a3 | 9 | * |
AnnaBridge | 189:f392fc9709a3 | 10 | * Unless required by applicable law or agreed to in writing, software |
AnnaBridge | 189:f392fc9709a3 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
AnnaBridge | 189:f392fc9709a3 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
AnnaBridge | 189:f392fc9709a3 | 13 | * See the License for the specific language governing permissions and |
AnnaBridge | 189:f392fc9709a3 | 14 | * limitations under the License. |
AnnaBridge | 189:f392fc9709a3 | 15 | */ |
AnnaBridge | 189:f392fc9709a3 | 16 | #include "i2c_api.h" |
AnnaBridge | 189:f392fc9709a3 | 17 | #include "mbed_error.h" |
AnnaBridge | 189:f392fc9709a3 | 18 | #include "pinmap.h" |
AnnaBridge | 189:f392fc9709a3 | 19 | #include "gpio_include.h" |
AnnaBridge | 189:f392fc9709a3 | 20 | |
AnnaBridge | 189:f392fc9709a3 | 21 | static const PinMap PinMap_I2C_SDA[] = { |
AnnaBridge | 189:f392fc9709a3 | 22 | {PC1, I2C_0, PIN_DATA(1, 2)}, |
AnnaBridge | 189:f392fc9709a3 | 23 | {PA5, I2C_1, PIN_DATA(1, 2)}, |
AnnaBridge | 189:f392fc9709a3 | 24 | {PL1, I2C_2, PIN_DATA(3, 2)}, |
AnnaBridge | 189:f392fc9709a3 | 25 | {PT0, I2C_3, PIN_DATA(1, 2)}, |
AnnaBridge | 189:f392fc9709a3 | 26 | {NC, NC, 0} |
AnnaBridge | 189:f392fc9709a3 | 27 | }; |
AnnaBridge | 189:f392fc9709a3 | 28 | |
AnnaBridge | 189:f392fc9709a3 | 29 | static const PinMap PinMap_I2C_SCL[] = { |
AnnaBridge | 189:f392fc9709a3 | 30 | {PC0, I2C_0, PIN_DATA(1, 2)}, |
AnnaBridge | 189:f392fc9709a3 | 31 | {PA4, I2C_1, PIN_DATA(1, 2)}, |
AnnaBridge | 189:f392fc9709a3 | 32 | {PL0, I2C_2, PIN_DATA(3, 2)}, |
AnnaBridge | 189:f392fc9709a3 | 33 | {PT1, I2C_3, PIN_DATA(1, 2)}, |
AnnaBridge | 189:f392fc9709a3 | 34 | {NC, NC, 0} |
AnnaBridge | 189:f392fc9709a3 | 35 | }; |
AnnaBridge | 189:f392fc9709a3 | 36 | |
AnnaBridge | 189:f392fc9709a3 | 37 | // Clock setting structure definition |
AnnaBridge | 189:f392fc9709a3 | 38 | typedef struct { |
AnnaBridge | 189:f392fc9709a3 | 39 | uint32_t sck; |
AnnaBridge | 189:f392fc9709a3 | 40 | uint32_t prsck; |
AnnaBridge | 189:f392fc9709a3 | 41 | } I2C_clock_setting_t; |
AnnaBridge | 189:f392fc9709a3 | 42 | |
AnnaBridge | 189:f392fc9709a3 | 43 | static const uint32_t I2C_SCK_DIVIDER_TBL[8] = { |
AnnaBridge | 189:f392fc9709a3 | 44 | 20, 24, 32, 48, 80, 144, 272, 528 |
AnnaBridge | 189:f392fc9709a3 | 45 | }; // SCK Divider value table |
AnnaBridge | 189:f392fc9709a3 | 46 | |
AnnaBridge | 189:f392fc9709a3 | 47 | I2C_clock_setting_t clk; |
AnnaBridge | 189:f392fc9709a3 | 48 | static uint32_t start_flag = 0; |
AnnaBridge | 189:f392fc9709a3 | 49 | |
AnnaBridge | 189:f392fc9709a3 | 50 | static int32_t wait_status(i2c_t *p_obj); |
AnnaBridge | 189:f392fc9709a3 | 51 | static void i2c_start_bit(i2c_t *obj); |
AnnaBridge | 189:f392fc9709a3 | 52 | |
AnnaBridge | 189:f392fc9709a3 | 53 | // Initialize the I2C peripheral. It sets the default parameters for I2C |
AnnaBridge | 189:f392fc9709a3 | 54 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) |
AnnaBridge | 189:f392fc9709a3 | 55 | { |
AnnaBridge | 189:f392fc9709a3 | 56 | MBED_ASSERT(obj != NULL); |
AnnaBridge | 189:f392fc9709a3 | 57 | I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA); |
AnnaBridge | 189:f392fc9709a3 | 58 | I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL); |
AnnaBridge | 189:f392fc9709a3 | 59 | I2CName i2c_name = (I2CName)pinmap_merge(i2c_sda, i2c_scl); |
AnnaBridge | 189:f392fc9709a3 | 60 | MBED_ASSERT((int)i2c_name != NC); |
AnnaBridge | 189:f392fc9709a3 | 61 | |
AnnaBridge | 189:f392fc9709a3 | 62 | switch (i2c_name) { |
AnnaBridge | 189:f392fc9709a3 | 63 | case I2C_0: |
AnnaBridge | 189:f392fc9709a3 | 64 | TSB_CG_FSYSENB_IPENB11 = ENABLE; |
AnnaBridge | 189:f392fc9709a3 | 65 | TSB_CG_FSYSENA_IPENA02 = ENABLE; |
AnnaBridge | 189:f392fc9709a3 | 66 | obj->i2c = TSB_I2C0; |
AnnaBridge | 189:f392fc9709a3 | 67 | break; |
AnnaBridge | 189:f392fc9709a3 | 68 | case I2C_1: |
AnnaBridge | 189:f392fc9709a3 | 69 | TSB_CG_FSYSENB_IPENB12 = ENABLE; |
AnnaBridge | 189:f392fc9709a3 | 70 | TSB_CG_FSYSENA_IPENA00 = ENABLE; |
AnnaBridge | 189:f392fc9709a3 | 71 | obj->i2c = TSB_I2C1; |
AnnaBridge | 189:f392fc9709a3 | 72 | break; |
AnnaBridge | 189:f392fc9709a3 | 73 | case I2C_2: |
AnnaBridge | 189:f392fc9709a3 | 74 | TSB_CG_FSYSENB_IPENB13 = ENABLE; |
AnnaBridge | 189:f392fc9709a3 | 75 | TSB_CG_FSYSENA_IPENA10 = ENABLE; |
AnnaBridge | 189:f392fc9709a3 | 76 | obj->i2c = TSB_I2C2; |
AnnaBridge | 189:f392fc9709a3 | 77 | case I2C_3: |
AnnaBridge | 189:f392fc9709a3 | 78 | TSB_CG_FSYSENB_IPENB14 = ENABLE; |
AnnaBridge | 189:f392fc9709a3 | 79 | TSB_CG_FSYSENA_IPENA15 = ENABLE; |
AnnaBridge | 189:f392fc9709a3 | 80 | obj->i2c = TSB_I2C3; |
AnnaBridge | 189:f392fc9709a3 | 81 | break; |
AnnaBridge | 189:f392fc9709a3 | 82 | default: |
AnnaBridge | 189:f392fc9709a3 | 83 | error("I2C is not available"); |
AnnaBridge | 189:f392fc9709a3 | 84 | break; |
AnnaBridge | 189:f392fc9709a3 | 85 | } |
AnnaBridge | 189:f392fc9709a3 | 86 | |
AnnaBridge | 189:f392fc9709a3 | 87 | pinmap_pinout(sda, PinMap_I2C_SDA); |
AnnaBridge | 189:f392fc9709a3 | 88 | pin_mode(sda, OpenDrain); |
AnnaBridge | 189:f392fc9709a3 | 89 | pin_mode(sda, PullUp); |
AnnaBridge | 189:f392fc9709a3 | 90 | |
AnnaBridge | 189:f392fc9709a3 | 91 | pinmap_pinout(scl, PinMap_I2C_SCL); |
AnnaBridge | 189:f392fc9709a3 | 92 | pin_mode(scl, OpenDrain); |
AnnaBridge | 189:f392fc9709a3 | 93 | pin_mode(scl, PullUp); |
AnnaBridge | 189:f392fc9709a3 | 94 | |
AnnaBridge | 189:f392fc9709a3 | 95 | i2c_reset(obj); |
AnnaBridge | 189:f392fc9709a3 | 96 | i2c_frequency(obj, 100000); |
AnnaBridge | 189:f392fc9709a3 | 97 | obj->i2c->CR2 = (I2CxCR2_I2CM_ENABLE | I2CxCR2_TRX | I2CxCR2_PIN_CLEAR | |
AnnaBridge | 189:f392fc9709a3 | 98 | I2CxCR2_INIT); |
AnnaBridge | 189:f392fc9709a3 | 99 | obj->i2c->OP = I2CxOP_INIT; |
AnnaBridge | 189:f392fc9709a3 | 100 | obj->i2c->IE = I2CxIE_CLEAR; |
AnnaBridge | 189:f392fc9709a3 | 101 | } |
AnnaBridge | 189:f392fc9709a3 | 102 | |
AnnaBridge | 189:f392fc9709a3 | 103 | // Configure the I2C frequency |
AnnaBridge | 189:f392fc9709a3 | 104 | void i2c_frequency(i2c_t *obj, int hz) |
AnnaBridge | 189:f392fc9709a3 | 105 | { |
AnnaBridge | 189:f392fc9709a3 | 106 | uint64_t sck, tmp_sck; |
AnnaBridge | 189:f392fc9709a3 | 107 | uint64_t prsck, tmp_prsck; |
AnnaBridge | 189:f392fc9709a3 | 108 | uint64_t fscl, tmp_fscl; |
AnnaBridge | 189:f392fc9709a3 | 109 | uint64_t fx; |
AnnaBridge | 189:f392fc9709a3 | 110 | |
AnnaBridge | 189:f392fc9709a3 | 111 | SystemCoreClockUpdate(); |
AnnaBridge | 189:f392fc9709a3 | 112 | |
AnnaBridge | 189:f392fc9709a3 | 113 | if (hz <= 1000000) { |
AnnaBridge | 189:f392fc9709a3 | 114 | sck = tmp_sck = 0; |
AnnaBridge | 189:f392fc9709a3 | 115 | prsck = tmp_prsck = 1; |
AnnaBridge | 189:f392fc9709a3 | 116 | fscl = tmp_fscl = 0; |
AnnaBridge | 189:f392fc9709a3 | 117 | for (prsck = 1; prsck <= 32; prsck++) { |
AnnaBridge | 189:f392fc9709a3 | 118 | fx = ((uint64_t)SystemCoreClock / prsck); |
AnnaBridge | 189:f392fc9709a3 | 119 | if ((fx < 20000000U) && (fx > 6666666U)) { |
AnnaBridge | 189:f392fc9709a3 | 120 | for (sck = 0; sck <= 7; sck++) { |
AnnaBridge | 189:f392fc9709a3 | 121 | fscl = (fx / (uint64_t)I2C_SCK_DIVIDER_TBL[sck]); |
AnnaBridge | 189:f392fc9709a3 | 122 | if ((fscl <= (uint64_t)hz) && (fscl > tmp_fscl)) { |
AnnaBridge | 189:f392fc9709a3 | 123 | tmp_fscl = fscl; |
AnnaBridge | 189:f392fc9709a3 | 124 | tmp_sck = sck; |
AnnaBridge | 189:f392fc9709a3 | 125 | tmp_prsck = (prsck < 32) ? prsck : 0; |
AnnaBridge | 189:f392fc9709a3 | 126 | } |
AnnaBridge | 189:f392fc9709a3 | 127 | } |
AnnaBridge | 189:f392fc9709a3 | 128 | } |
AnnaBridge | 189:f392fc9709a3 | 129 | } |
AnnaBridge | 189:f392fc9709a3 | 130 | clk.sck = (uint32_t)tmp_sck; |
AnnaBridge | 189:f392fc9709a3 | 131 | clk.prsck = (tmp_prsck < 32) ? (uint32_t)(tmp_prsck - 1) : 0; |
AnnaBridge | 189:f392fc9709a3 | 132 | } |
AnnaBridge | 189:f392fc9709a3 | 133 | |
AnnaBridge | 189:f392fc9709a3 | 134 | obj->i2c->CR1 = (I2CxCR1_ACK | clk.sck); |
AnnaBridge | 189:f392fc9709a3 | 135 | obj->i2c->PRS = (I2CxPRS_PRCK & clk.prsck); |
AnnaBridge | 189:f392fc9709a3 | 136 | } |
AnnaBridge | 189:f392fc9709a3 | 137 | |
AnnaBridge | 189:f392fc9709a3 | 138 | int i2c_start(i2c_t *obj) |
AnnaBridge | 189:f392fc9709a3 | 139 | { |
AnnaBridge | 189:f392fc9709a3 | 140 | start_flag = 1; // Start Condition |
AnnaBridge | 189:f392fc9709a3 | 141 | return 0; |
AnnaBridge | 189:f392fc9709a3 | 142 | } |
AnnaBridge | 189:f392fc9709a3 | 143 | |
AnnaBridge | 189:f392fc9709a3 | 144 | int i2c_stop(i2c_t *obj) |
AnnaBridge | 189:f392fc9709a3 | 145 | { |
AnnaBridge | 189:f392fc9709a3 | 146 | uint32_t timeout = I2C_TIMEOUT; |
AnnaBridge | 189:f392fc9709a3 | 147 | |
AnnaBridge | 189:f392fc9709a3 | 148 | obj->i2c->CR2 = I2CxCR2_STOP_CONDITION; |
AnnaBridge | 189:f392fc9709a3 | 149 | while ((obj->i2c->SR & I2CxSR_BB) == I2CxSR_BB) { |
AnnaBridge | 189:f392fc9709a3 | 150 | if (timeout == 0) |
AnnaBridge | 189:f392fc9709a3 | 151 | break; |
AnnaBridge | 189:f392fc9709a3 | 152 | timeout--; |
AnnaBridge | 189:f392fc9709a3 | 153 | } |
AnnaBridge | 189:f392fc9709a3 | 154 | return 0; |
AnnaBridge | 189:f392fc9709a3 | 155 | } |
AnnaBridge | 189:f392fc9709a3 | 156 | |
AnnaBridge | 189:f392fc9709a3 | 157 | void i2c_reset(i2c_t *obj) |
AnnaBridge | 189:f392fc9709a3 | 158 | { |
AnnaBridge | 189:f392fc9709a3 | 159 | obj->i2c->CR2 = I2CxCR2_SWRES_10; |
AnnaBridge | 189:f392fc9709a3 | 160 | obj->i2c->CR2 = I2CxCR2_SWRES_01; |
AnnaBridge | 189:f392fc9709a3 | 161 | } |
AnnaBridge | 189:f392fc9709a3 | 162 | |
AnnaBridge | 189:f392fc9709a3 | 163 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) |
AnnaBridge | 189:f392fc9709a3 | 164 | { |
AnnaBridge | 189:f392fc9709a3 | 165 | int32_t result = 0; |
AnnaBridge | 189:f392fc9709a3 | 166 | int32_t count = 0; |
AnnaBridge | 189:f392fc9709a3 | 167 | int32_t pdata = 0; |
AnnaBridge | 189:f392fc9709a3 | 168 | |
AnnaBridge | 189:f392fc9709a3 | 169 | if (length > 0) { |
AnnaBridge | 189:f392fc9709a3 | 170 | start_flag = 1; // Start Condition |
AnnaBridge | 189:f392fc9709a3 | 171 | if (i2c_byte_write(obj, (int32_t)((uint32_t)address | 1U)) == I2C_ACK) { |
AnnaBridge | 189:f392fc9709a3 | 172 | while (count < length) { |
AnnaBridge | 189:f392fc9709a3 | 173 | pdata = i2c_byte_read(obj, ((count < (length - 1)) ? 0 : 1)); |
AnnaBridge | 189:f392fc9709a3 | 174 | if (pdata < 0) { |
AnnaBridge | 189:f392fc9709a3 | 175 | break; |
AnnaBridge | 189:f392fc9709a3 | 176 | } |
AnnaBridge | 189:f392fc9709a3 | 177 | data[count++] = (uint8_t)pdata; |
AnnaBridge | 189:f392fc9709a3 | 178 | } |
AnnaBridge | 189:f392fc9709a3 | 179 | result = count; |
AnnaBridge | 189:f392fc9709a3 | 180 | } else { |
AnnaBridge | 189:f392fc9709a3 | 181 | stop = 1; |
AnnaBridge | 189:f392fc9709a3 | 182 | result = I2C_ERROR_NO_SLAVE; |
AnnaBridge | 189:f392fc9709a3 | 183 | } |
AnnaBridge | 189:f392fc9709a3 | 184 | |
AnnaBridge | 189:f392fc9709a3 | 185 | if (stop) { // Stop Condition |
AnnaBridge | 189:f392fc9709a3 | 186 | i2c_stop(obj); |
AnnaBridge | 189:f392fc9709a3 | 187 | } |
AnnaBridge | 189:f392fc9709a3 | 188 | } |
AnnaBridge | 189:f392fc9709a3 | 189 | return (result); |
AnnaBridge | 189:f392fc9709a3 | 190 | } |
AnnaBridge | 189:f392fc9709a3 | 191 | |
AnnaBridge | 189:f392fc9709a3 | 192 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) |
AnnaBridge | 189:f392fc9709a3 | 193 | { |
AnnaBridge | 189:f392fc9709a3 | 194 | int32_t result = 0; |
AnnaBridge | 189:f392fc9709a3 | 195 | int32_t count = 0; |
AnnaBridge | 189:f392fc9709a3 | 196 | |
AnnaBridge | 189:f392fc9709a3 | 197 | start_flag = 1; // Start Condition |
AnnaBridge | 189:f392fc9709a3 | 198 | if (i2c_byte_write(obj, address) == I2C_ACK) { |
AnnaBridge | 189:f392fc9709a3 | 199 | while (count < length) { |
AnnaBridge | 189:f392fc9709a3 | 200 | if (i2c_byte_write(obj, (int32_t)data[count++]) < I2C_ACK) { |
AnnaBridge | 189:f392fc9709a3 | 201 | break; |
AnnaBridge | 189:f392fc9709a3 | 202 | } |
AnnaBridge | 189:f392fc9709a3 | 203 | } |
AnnaBridge | 189:f392fc9709a3 | 204 | result = count; |
AnnaBridge | 189:f392fc9709a3 | 205 | } else { |
AnnaBridge | 189:f392fc9709a3 | 206 | stop = 1; |
AnnaBridge | 189:f392fc9709a3 | 207 | result = I2C_ERROR_NO_SLAVE; |
AnnaBridge | 189:f392fc9709a3 | 208 | } |
AnnaBridge | 189:f392fc9709a3 | 209 | |
AnnaBridge | 189:f392fc9709a3 | 210 | if (stop) { // Stop Condition |
AnnaBridge | 189:f392fc9709a3 | 211 | i2c_stop(obj); |
AnnaBridge | 189:f392fc9709a3 | 212 | } |
AnnaBridge | 189:f392fc9709a3 | 213 | return (result); |
AnnaBridge | 189:f392fc9709a3 | 214 | } |
AnnaBridge | 189:f392fc9709a3 | 215 | |
AnnaBridge | 189:f392fc9709a3 | 216 | int i2c_byte_read(i2c_t *obj, int last) |
AnnaBridge | 189:f392fc9709a3 | 217 | { |
AnnaBridge | 189:f392fc9709a3 | 218 | int32_t result; |
AnnaBridge | 189:f392fc9709a3 | 219 | |
AnnaBridge | 189:f392fc9709a3 | 220 | obj->i2c->ST = I2CxST_CLEAR; |
AnnaBridge | 189:f392fc9709a3 | 221 | if (last) { |
AnnaBridge | 189:f392fc9709a3 | 222 | obj->i2c->OP |= I2CxOP_MFACK; |
AnnaBridge | 189:f392fc9709a3 | 223 | } else { |
AnnaBridge | 189:f392fc9709a3 | 224 | obj->i2c->OP &= ~I2CxOP_MFACK; |
AnnaBridge | 189:f392fc9709a3 | 225 | } |
AnnaBridge | 189:f392fc9709a3 | 226 | obj->i2c->DBR = (0 & I2CxDBR_DB_MASK); |
AnnaBridge | 189:f392fc9709a3 | 227 | if (wait_status(obj) < 0) { |
AnnaBridge | 189:f392fc9709a3 | 228 | result = -1; |
AnnaBridge | 189:f392fc9709a3 | 229 | } else { |
AnnaBridge | 189:f392fc9709a3 | 230 | result = (int32_t)(obj->i2c->DBR & I2CxDBR_DB_MASK); |
AnnaBridge | 189:f392fc9709a3 | 231 | } |
AnnaBridge | 189:f392fc9709a3 | 232 | return (result); |
AnnaBridge | 189:f392fc9709a3 | 233 | } |
AnnaBridge | 189:f392fc9709a3 | 234 | |
AnnaBridge | 189:f392fc9709a3 | 235 | int i2c_byte_write(i2c_t *obj, int data) |
AnnaBridge | 189:f392fc9709a3 | 236 | { |
AnnaBridge | 189:f392fc9709a3 | 237 | int32_t result; |
AnnaBridge | 189:f392fc9709a3 | 238 | |
AnnaBridge | 189:f392fc9709a3 | 239 | obj->i2c->ST = I2CxST_CLEAR; |
AnnaBridge | 189:f392fc9709a3 | 240 | if (start_flag == 1) { |
AnnaBridge | 189:f392fc9709a3 | 241 | obj->i2c->DBR = (data & I2CxDBR_DB_MASK); |
AnnaBridge | 189:f392fc9709a3 | 242 | i2c_start_bit(obj); |
AnnaBridge | 189:f392fc9709a3 | 243 | start_flag = 0; |
AnnaBridge | 189:f392fc9709a3 | 244 | } else { |
AnnaBridge | 189:f392fc9709a3 | 245 | obj->i2c->DBR = (data & I2CxDBR_DB_MASK); |
AnnaBridge | 189:f392fc9709a3 | 246 | } |
AnnaBridge | 189:f392fc9709a3 | 247 | |
AnnaBridge | 189:f392fc9709a3 | 248 | if (wait_status(obj) < 0) { |
AnnaBridge | 189:f392fc9709a3 | 249 | return (-1); |
AnnaBridge | 189:f392fc9709a3 | 250 | } |
AnnaBridge | 189:f392fc9709a3 | 251 | |
AnnaBridge | 189:f392fc9709a3 | 252 | if (!((obj->i2c->SR & I2CxSR_LRB) == I2CxSR_LRB)) { |
AnnaBridge | 189:f392fc9709a3 | 253 | result = 1; |
AnnaBridge | 189:f392fc9709a3 | 254 | } else { |
AnnaBridge | 189:f392fc9709a3 | 255 | result = 0; |
AnnaBridge | 189:f392fc9709a3 | 256 | } |
AnnaBridge | 189:f392fc9709a3 | 257 | return (result); |
AnnaBridge | 189:f392fc9709a3 | 258 | } |
AnnaBridge | 189:f392fc9709a3 | 259 | |
AnnaBridge | 189:f392fc9709a3 | 260 | static void i2c_start_bit(i2c_t *obj) // Send START command |
AnnaBridge | 189:f392fc9709a3 | 261 | { |
AnnaBridge | 189:f392fc9709a3 | 262 | uint32_t opreg; |
AnnaBridge | 189:f392fc9709a3 | 263 | opreg = obj->i2c->OP; |
AnnaBridge | 189:f392fc9709a3 | 264 | opreg &= ~(I2CxOP_RSTA | I2CxOP_SREN); |
AnnaBridge | 189:f392fc9709a3 | 265 | if ((obj->i2c->SR & I2CxSR_BB)) { |
AnnaBridge | 189:f392fc9709a3 | 266 | opreg |= I2CxOP_SREN; |
AnnaBridge | 189:f392fc9709a3 | 267 | } |
AnnaBridge | 189:f392fc9709a3 | 268 | obj->i2c->OP = opreg; |
AnnaBridge | 189:f392fc9709a3 | 269 | obj->i2c->CR2 |= I2CxCR2_START_CONDITION; |
AnnaBridge | 189:f392fc9709a3 | 270 | } |
AnnaBridge | 189:f392fc9709a3 | 271 | |
AnnaBridge | 189:f392fc9709a3 | 272 | static int32_t wait_status(i2c_t *p_obj) |
AnnaBridge | 189:f392fc9709a3 | 273 | { |
AnnaBridge | 189:f392fc9709a3 | 274 | volatile int32_t timeout; |
AnnaBridge | 189:f392fc9709a3 | 275 | timeout = I2C_TIMEOUT; |
AnnaBridge | 189:f392fc9709a3 | 276 | while (!((p_obj->i2c->ST & I2CxST_I2C) == I2CxST_I2C)) { |
AnnaBridge | 189:f392fc9709a3 | 277 | if ((timeout--) == 0) { |
AnnaBridge | 189:f392fc9709a3 | 278 | return (-1); |
AnnaBridge | 189:f392fc9709a3 | 279 | } |
AnnaBridge | 189:f392fc9709a3 | 280 | } |
AnnaBridge | 189:f392fc9709a3 | 281 | return (0); |
AnnaBridge | 189:f392fc9709a3 | 282 | } |
AnnaBridge | 189:f392fc9709a3 | 283 | |
AnnaBridge | 189:f392fc9709a3 | 284 | void i2c_slave_mode(i2c_t *obj, int enable_slave) |
AnnaBridge | 189:f392fc9709a3 | 285 | { |
AnnaBridge | 189:f392fc9709a3 | 286 | if (enable_slave) { |
AnnaBridge | 189:f392fc9709a3 | 287 | obj->i2c->OP = I2CxOP_SLAVE_INIT; |
AnnaBridge | 189:f392fc9709a3 | 288 | obj->i2c->CR1 = (I2CxCR1_ACK | clk.sck); |
AnnaBridge | 189:f392fc9709a3 | 289 | obj->i2c->CR2 = (I2CxCR2_INIT | I2CxCR2_PIN_CLEAR); |
AnnaBridge | 189:f392fc9709a3 | 290 | obj->i2c->PRS = (I2CxPRS_PRCK & clk.prsck); |
AnnaBridge | 189:f392fc9709a3 | 291 | obj->i2c->AR = (obj->address & I2CAR_SA_MASK); |
AnnaBridge | 189:f392fc9709a3 | 292 | obj->i2c->IE = I2CxIE_INTI2C; |
AnnaBridge | 189:f392fc9709a3 | 293 | } else { |
AnnaBridge | 189:f392fc9709a3 | 294 | i2c_reset(obj); |
AnnaBridge | 189:f392fc9709a3 | 295 | obj->i2c->CR2 = (I2CxCR2_I2CM_ENABLE | I2CxCR2_TRX | I2CxCR2_PIN_CLEAR | |
AnnaBridge | 189:f392fc9709a3 | 296 | I2CxCR2_INIT); |
AnnaBridge | 189:f392fc9709a3 | 297 | obj->i2c->OP = I2CxOP_INIT; |
AnnaBridge | 189:f392fc9709a3 | 298 | obj->i2c->CR1 = (I2CxCR1_ACK | clk.sck); |
AnnaBridge | 189:f392fc9709a3 | 299 | obj->i2c->PRS = (I2CxPRS_PRCK & clk.prsck); |
AnnaBridge | 189:f392fc9709a3 | 300 | NVIC_DisableIRQ(obj->IRQn); |
AnnaBridge | 189:f392fc9709a3 | 301 | NVIC_ClearPendingIRQ(obj->IRQn); |
AnnaBridge | 189:f392fc9709a3 | 302 | obj->i2c->ST = I2CxST_CLEAR; |
AnnaBridge | 189:f392fc9709a3 | 303 | } |
AnnaBridge | 189:f392fc9709a3 | 304 | } |
AnnaBridge | 189:f392fc9709a3 | 305 | |
AnnaBridge | 189:f392fc9709a3 | 306 | int i2c_slave_receive(i2c_t *obj) |
AnnaBridge | 189:f392fc9709a3 | 307 | { |
AnnaBridge | 189:f392fc9709a3 | 308 | int32_t result = I2C_NO_DATA; |
AnnaBridge | 189:f392fc9709a3 | 309 | |
AnnaBridge | 189:f392fc9709a3 | 310 | if ((obj->i2c->ST & I2CxST_I2C) && (obj->i2c->OP & I2CxOP_SAST)) { |
AnnaBridge | 189:f392fc9709a3 | 311 | if ((obj->i2c->SR & I2CxSR_TRX) == I2CxSR_TRX) { |
AnnaBridge | 189:f392fc9709a3 | 312 | result = I2C_READ_ADDRESSED; |
AnnaBridge | 189:f392fc9709a3 | 313 | } else { |
AnnaBridge | 189:f392fc9709a3 | 314 | result = I2C_WRITE_ADDRESSED; |
AnnaBridge | 189:f392fc9709a3 | 315 | } |
AnnaBridge | 189:f392fc9709a3 | 316 | } |
AnnaBridge | 189:f392fc9709a3 | 317 | return (result); |
AnnaBridge | 189:f392fc9709a3 | 318 | } |
AnnaBridge | 189:f392fc9709a3 | 319 | |
AnnaBridge | 189:f392fc9709a3 | 320 | int i2c_slave_read(i2c_t *obj, char *data, int length) |
AnnaBridge | 189:f392fc9709a3 | 321 | { |
AnnaBridge | 189:f392fc9709a3 | 322 | int32_t count = 0; |
AnnaBridge | 189:f392fc9709a3 | 323 | |
AnnaBridge | 189:f392fc9709a3 | 324 | while (count < length) { |
AnnaBridge | 189:f392fc9709a3 | 325 | int32_t pdata = i2c_byte_read(obj, ((count < (length - 1)) ? 0 : 1)); |
AnnaBridge | 189:f392fc9709a3 | 326 | if ((obj->i2c->SR & I2CxSR_TRX)) { |
AnnaBridge | 189:f392fc9709a3 | 327 | return (count); |
AnnaBridge | 189:f392fc9709a3 | 328 | } else { |
AnnaBridge | 189:f392fc9709a3 | 329 | if (pdata < 0) { |
AnnaBridge | 189:f392fc9709a3 | 330 | break; |
AnnaBridge | 189:f392fc9709a3 | 331 | } |
AnnaBridge | 189:f392fc9709a3 | 332 | data[count++] = (uint8_t)pdata; |
AnnaBridge | 189:f392fc9709a3 | 333 | } |
AnnaBridge | 189:f392fc9709a3 | 334 | } |
AnnaBridge | 189:f392fc9709a3 | 335 | i2c_slave_mode(obj,1); |
AnnaBridge | 189:f392fc9709a3 | 336 | return (count); |
AnnaBridge | 189:f392fc9709a3 | 337 | } |
AnnaBridge | 189:f392fc9709a3 | 338 | |
AnnaBridge | 189:f392fc9709a3 | 339 | int i2c_slave_write(i2c_t *obj, const char *data, int length) |
AnnaBridge | 189:f392fc9709a3 | 340 | { |
AnnaBridge | 189:f392fc9709a3 | 341 | int32_t count = 0; |
AnnaBridge | 189:f392fc9709a3 | 342 | |
AnnaBridge | 189:f392fc9709a3 | 343 | while (count < length) { |
AnnaBridge | 189:f392fc9709a3 | 344 | if (i2c_byte_write(obj, (int32_t)data[count++]) < I2C_ACK) { |
AnnaBridge | 189:f392fc9709a3 | 345 | break; |
AnnaBridge | 189:f392fc9709a3 | 346 | } |
AnnaBridge | 189:f392fc9709a3 | 347 | } |
AnnaBridge | 189:f392fc9709a3 | 348 | i2c_slave_mode(obj,1); |
AnnaBridge | 189:f392fc9709a3 | 349 | return (count); |
AnnaBridge | 189:f392fc9709a3 | 350 | } |
AnnaBridge | 189:f392fc9709a3 | 351 | |
AnnaBridge | 189:f392fc9709a3 | 352 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) |
AnnaBridge | 189:f392fc9709a3 | 353 | { |
AnnaBridge | 189:f392fc9709a3 | 354 | obj->address = address & I2CAR_SA_MASK; |
AnnaBridge | 189:f392fc9709a3 | 355 | i2c_slave_mode(obj,1); |
AnnaBridge | 189:f392fc9709a3 | 356 | } |