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Dependencies:   mbed

sensirion/sensirion_i2c.c@0:c8ecd653066c, 2021-08-16 (annotated)

Committer:
Picard22
Date:
Mon Aug 16 13:00:07 2021 +0000
Revision:
0:c8ecd653066c
Sensirion_Test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Picard22 0:c8ecd653066c 1 /*
Picard22 0:c8ecd653066c 2 * Copyright (c) 2018, Sensirion AG
Picard22 0:c8ecd653066c 3 * All rights reserved.
Picard22 0:c8ecd653066c 4 *
Picard22 0:c8ecd653066c 5 * Redistribution and use in source and binary forms, with or without
Picard22 0:c8ecd653066c 6 * modification, are permitted provided that the following conditions are met:
Picard22 0:c8ecd653066c 7 *
Picard22 0:c8ecd653066c 8 * * Redistributions of source code must retain the above copyright notice, this
Picard22 0:c8ecd653066c 9 * list of conditions and the following disclaimer.
Picard22 0:c8ecd653066c 10 *
Picard22 0:c8ecd653066c 11 * * Redistributions in binary form must reproduce the above copyright notice,
Picard22 0:c8ecd653066c 12 * this list of conditions and the following disclaimer in the documentation
Picard22 0:c8ecd653066c 13 * and/or other materials provided with the distribution.
Picard22 0:c8ecd653066c 14 *
Picard22 0:c8ecd653066c 15 * * Neither the name of Sensirion AG nor the names of its
Picard22 0:c8ecd653066c 16 * contributors may be used to endorse or promote products derived from
Picard22 0:c8ecd653066c 17 * this software without specific prior written permission.
Picard22 0:c8ecd653066c 18 *
Picard22 0:c8ecd653066c 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Picard22 0:c8ecd653066c 20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Picard22 0:c8ecd653066c 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Picard22 0:c8ecd653066c 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
Picard22 0:c8ecd653066c 23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
Picard22 0:c8ecd653066c 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
Picard22 0:c8ecd653066c 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Picard22 0:c8ecd653066c 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Picard22 0:c8ecd653066c 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
Picard22 0:c8ecd653066c 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Picard22 0:c8ecd653066c 29 * POSSIBILITY OF SUCH DAMAGE.
Picard22 0:c8ecd653066c 30 */
Picard22 0:c8ecd653066c 31
Picard22 0:c8ecd653066c 32 #include "sensirion_i2c.h"
Picard22 0:c8ecd653066c 33 #include "sensirion_common.h"
Picard22 0:c8ecd653066c 34 #include "sensirion_config.h"
Picard22 0:c8ecd653066c 35 #include "sensirion_i2c_hal.h"
Picard22 0:c8ecd653066c 36
Picard22 0:c8ecd653066c 37 uint8_t sensirion_i2c_generate_crc(const uint8_t* data, uint16_t count) {
Picard22 0:c8ecd653066c 38 uint16_t current_byte;
Picard22 0:c8ecd653066c 39 uint8_t crc = CRC8_INIT;
Picard22 0:c8ecd653066c 40 uint8_t crc_bit;
Picard22 0:c8ecd653066c 41
Picard22 0:c8ecd653066c 42 /* calculates 8-Bit checksum with given polynomial */
Picard22 0:c8ecd653066c 43 for (current_byte = 0; current_byte < count; ++current_byte) {
Picard22 0:c8ecd653066c 44 crc ^= (data[current_byte]);
Picard22 0:c8ecd653066c 45 for (crc_bit = 8; crc_bit > 0; --crc_bit) {
Picard22 0:c8ecd653066c 46 if (crc & 0x80)
Picard22 0:c8ecd653066c 47 crc = (crc << 1) ^ CRC8_POLYNOMIAL;
Picard22 0:c8ecd653066c 48 else
Picard22 0:c8ecd653066c 49 crc = (crc << 1);
Picard22 0:c8ecd653066c 50 }
Picard22 0:c8ecd653066c 51 }
Picard22 0:c8ecd653066c 52 return crc;
Picard22 0:c8ecd653066c 53 }
Picard22 0:c8ecd653066c 54
Picard22 0:c8ecd653066c 55 int8_t sensirion_i2c_check_crc(const uint8_t* data, uint16_t count,
Picard22 0:c8ecd653066c 56 uint8_t checksum) {
Picard22 0:c8ecd653066c 57 if (sensirion_i2c_generate_crc(data, count) != checksum)
Picard22 0:c8ecd653066c 58 return CRC_ERROR;
Picard22 0:c8ecd653066c 59 return NO_ERROR;
Picard22 0:c8ecd653066c 60 }
Picard22 0:c8ecd653066c 61
Picard22 0:c8ecd653066c 62 int16_t sensirion_i2c_general_call_reset(void) {
Picard22 0:c8ecd653066c 63 const uint8_t data = 0x06;
Picard22 0:c8ecd653066c 64 return sensirion_i2c_hal_write(0, &data, (uint16_t)sizeof(data));
Picard22 0:c8ecd653066c 65 }
Picard22 0:c8ecd653066c 66
Picard22 0:c8ecd653066c 67 uint16_t sensirion_i2c_fill_cmd_send_buf(uint8_t* buf, uint16_t cmd,
Picard22 0:c8ecd653066c 68 const uint16_t* args,
Picard22 0:c8ecd653066c 69 uint8_t num_args) {
Picard22 0:c8ecd653066c 70 uint8_t i;
Picard22 0:c8ecd653066c 71 uint16_t idx = 0;
Picard22 0:c8ecd653066c 72
Picard22 0:c8ecd653066c 73 buf[idx++] = (uint8_t)((cmd & 0xFF00) >> 8);
Picard22 0:c8ecd653066c 74 buf[idx++] = (uint8_t)((cmd & 0x00FF) >> 0);
Picard22 0:c8ecd653066c 75
Picard22 0:c8ecd653066c 76 for (i = 0; i < num_args; ++i) {
Picard22 0:c8ecd653066c 77 buf[idx++] = (uint8_t)((args[i] & 0xFF00) >> 8);
Picard22 0:c8ecd653066c 78 buf[idx++] = (uint8_t)((args[i] & 0x00FF) >> 0);
Picard22 0:c8ecd653066c 79
Picard22 0:c8ecd653066c 80 uint8_t crc = sensirion_i2c_generate_crc((uint8_t*)&buf[idx - 2],
Picard22 0:c8ecd653066c 81 SENSIRION_WORD_SIZE);
Picard22 0:c8ecd653066c 82 buf[idx++] = crc;
Picard22 0:c8ecd653066c 83 }
Picard22 0:c8ecd653066c 84 return idx;
Picard22 0:c8ecd653066c 85 }
Picard22 0:c8ecd653066c 86
Picard22 0:c8ecd653066c 87 int16_t sensirion_i2c_read_words_as_bytes(uint8_t address, uint8_t* data,
Picard22 0:c8ecd653066c 88 uint16_t num_words) {
Picard22 0:c8ecd653066c 89 int16_t ret;
Picard22 0:c8ecd653066c 90 uint16_t i, j;
Picard22 0:c8ecd653066c 91 uint16_t size = num_words * (SENSIRION_WORD_SIZE + CRC8_LEN);
Picard22 0:c8ecd653066c 92 uint16_t word_buf[SENSIRION_MAX_BUFFER_WORDS];
Picard22 0:c8ecd653066c 93 uint8_t* const buf8 = (uint8_t*)word_buf;
Picard22 0:c8ecd653066c 94
Picard22 0:c8ecd653066c 95 ret = sensirion_i2c_hal_read(address, buf8, size);
Picard22 0:c8ecd653066c 96 if (ret != NO_ERROR)
Picard22 0:c8ecd653066c 97 return ret;
Picard22 0:c8ecd653066c 98
Picard22 0:c8ecd653066c 99 /* check the CRC for each word */
Picard22 0:c8ecd653066c 100 for (i = 0, j = 0; i < size; i += SENSIRION_WORD_SIZE + CRC8_LEN) {
Picard22 0:c8ecd653066c 101
Picard22 0:c8ecd653066c 102 ret = sensirion_i2c_check_crc(&buf8[i], SENSIRION_WORD_SIZE,
Picard22 0:c8ecd653066c 103 buf8[i + SENSIRION_WORD_SIZE]);
Picard22 0:c8ecd653066c 104 if (ret != NO_ERROR)
Picard22 0:c8ecd653066c 105 return ret;
Picard22 0:c8ecd653066c 106
Picard22 0:c8ecd653066c 107 data[j++] = buf8[i];
Picard22 0:c8ecd653066c 108 data[j++] = buf8[i + 1];
Picard22 0:c8ecd653066c 109 }
Picard22 0:c8ecd653066c 110
Picard22 0:c8ecd653066c 111 return NO_ERROR;
Picard22 0:c8ecd653066c 112 }
Picard22 0:c8ecd653066c 113
Picard22 0:c8ecd653066c 114 int16_t sensirion_i2c_read_words(uint8_t address, uint16_t* data_words,
Picard22 0:c8ecd653066c 115 uint16_t num_words) {
Picard22 0:c8ecd653066c 116 int16_t ret;
Picard22 0:c8ecd653066c 117 uint8_t i;
Picard22 0:c8ecd653066c 118
Picard22 0:c8ecd653066c 119 ret = sensirion_i2c_read_words_as_bytes(address, (uint8_t*)data_words,
Picard22 0:c8ecd653066c 120 num_words);
Picard22 0:c8ecd653066c 121 if (ret != NO_ERROR)
Picard22 0:c8ecd653066c 122 return ret;
Picard22 0:c8ecd653066c 123
Picard22 0:c8ecd653066c 124 for (i = 0; i < num_words; ++i) {
Picard22 0:c8ecd653066c 125 const uint8_t* word_bytes = (uint8_t*)&data_words[i];
Picard22 0:c8ecd653066c 126 data_words[i] = ((uint16_t)word_bytes[0] << 8) | word_bytes[1];
Picard22 0:c8ecd653066c 127 }
Picard22 0:c8ecd653066c 128
Picard22 0:c8ecd653066c 129 return NO_ERROR;
Picard22 0:c8ecd653066c 130 }
Picard22 0:c8ecd653066c 131
Picard22 0:c8ecd653066c 132 int16_t sensirion_i2c_write_cmd(uint8_t address, uint16_t command) {
Picard22 0:c8ecd653066c 133 uint8_t buf[SENSIRION_COMMAND_SIZE];
Picard22 0:c8ecd653066c 134
Picard22 0:c8ecd653066c 135 sensirion_i2c_fill_cmd_send_buf(buf, command, NULL, 0);
Picard22 0:c8ecd653066c 136 return sensirion_i2c_hal_write(address, buf, SENSIRION_COMMAND_SIZE);
Picard22 0:c8ecd653066c 137 }
Picard22 0:c8ecd653066c 138
Picard22 0:c8ecd653066c 139 int16_t sensirion_i2c_write_cmd_with_args(uint8_t address, uint16_t command,
Picard22 0:c8ecd653066c 140 const uint16_t* data_words,
Picard22 0:c8ecd653066c 141 uint16_t num_words) {
Picard22 0:c8ecd653066c 142 uint8_t buf[SENSIRION_MAX_BUFFER_WORDS];
Picard22 0:c8ecd653066c 143 uint16_t buf_size;
Picard22 0:c8ecd653066c 144
Picard22 0:c8ecd653066c 145 buf_size =
Picard22 0:c8ecd653066c 146 sensirion_i2c_fill_cmd_send_buf(buf, command, data_words, num_words);
Picard22 0:c8ecd653066c 147 return sensirion_i2c_hal_write(address, buf, buf_size);
Picard22 0:c8ecd653066c 148 }
Picard22 0:c8ecd653066c 149
Picard22 0:c8ecd653066c 150 int16_t sensirion_i2c_delayed_read_cmd(uint8_t address, uint16_t cmd,
Picard22 0:c8ecd653066c 151 uint32_t delay_us, uint16_t* data_words,
Picard22 0:c8ecd653066c 152 uint16_t num_words) {
Picard22 0:c8ecd653066c 153 int16_t ret;
Picard22 0:c8ecd653066c 154 uint8_t buf[SENSIRION_COMMAND_SIZE];
Picard22 0:c8ecd653066c 155
Picard22 0:c8ecd653066c 156 sensirion_i2c_fill_cmd_send_buf(buf, cmd, NULL, 0);
Picard22 0:c8ecd653066c 157 ret = sensirion_i2c_hal_write(address, buf, SENSIRION_COMMAND_SIZE);
Picard22 0:c8ecd653066c 158 if (ret != NO_ERROR)
Picard22 0:c8ecd653066c 159 return ret;
Picard22 0:c8ecd653066c 160
Picard22 0:c8ecd653066c 161 if (delay_us)
Picard22 0:c8ecd653066c 162 sensirion_i2c_hal_sleep_usec(delay_us);
Picard22 0:c8ecd653066c 163
Picard22 0:c8ecd653066c 164 return sensirion_i2c_read_words(address, data_words, num_words);
Picard22 0:c8ecd653066c 165 }
Picard22 0:c8ecd653066c 166
Picard22 0:c8ecd653066c 167 int16_t sensirion_i2c_read_cmd(uint8_t address, uint16_t cmd,
Picard22 0:c8ecd653066c 168 uint16_t* data_words, uint16_t num_words) {
Picard22 0:c8ecd653066c 169 return sensirion_i2c_delayed_read_cmd(address, cmd, 0, data_words,
Picard22 0:c8ecd653066c 170 num_words);
Picard22 0:c8ecd653066c 171 }
Picard22 0:c8ecd653066c 172
Picard22 0:c8ecd653066c 173 uint16_t sensirion_i2c_add_command_to_buffer(uint8_t* buffer, uint16_t offset,
Picard22 0:c8ecd653066c 174 uint16_t command) {
Picard22 0:c8ecd653066c 175 buffer[offset++] = (uint8_t)((command & 0xFF00) >> 8);
Picard22 0:c8ecd653066c 176 buffer[offset++] = (uint8_t)((command & 0x00FF) >> 0);
Picard22 0:c8ecd653066c 177 return offset;
Picard22 0:c8ecd653066c 178 }
Picard22 0:c8ecd653066c 179
Picard22 0:c8ecd653066c 180 uint16_t sensirion_i2c_add_uint32_t_to_buffer(uint8_t* buffer, uint16_t offset,
Picard22 0:c8ecd653066c 181 uint32_t data) {
Picard22 0:c8ecd653066c 182 buffer[offset++] = (uint8_t)((data & 0xFF000000) >> 24);
Picard22 0:c8ecd653066c 183 buffer[offset++] = (uint8_t)((data & 0x00FF0000) >> 16);
Picard22 0:c8ecd653066c 184 buffer[offset] = sensirion_i2c_generate_crc(
Picard22 0:c8ecd653066c 185 &buffer[offset - SENSIRION_WORD_SIZE], SENSIRION_WORD_SIZE);
Picard22 0:c8ecd653066c 186 offset++;
Picard22 0:c8ecd653066c 187 buffer[offset++] = (uint8_t)((data & 0x0000FF00) >> 8);
Picard22 0:c8ecd653066c 188 buffer[offset++] = (uint8_t)((data & 0x000000FF) >> 0);
Picard22 0:c8ecd653066c 189 buffer[offset] = sensirion_i2c_generate_crc(
Picard22 0:c8ecd653066c 190 &buffer[offset - SENSIRION_WORD_SIZE], SENSIRION_WORD_SIZE);
Picard22 0:c8ecd653066c 191 offset++;
Picard22 0:c8ecd653066c 192
Picard22 0:c8ecd653066c 193 return offset;
Picard22 0:c8ecd653066c 194 }
Picard22 0:c8ecd653066c 195
Picard22 0:c8ecd653066c 196 uint16_t sensirion_i2c_add_int32_t_to_buffer(uint8_t* buffer, uint16_t offset,
Picard22 0:c8ecd653066c 197 int32_t data) {
Picard22 0:c8ecd653066c 198 return sensirion_i2c_add_uint32_t_to_buffer(buffer, offset, (uint32_t)data);
Picard22 0:c8ecd653066c 199 }
Picard22 0:c8ecd653066c 200
Picard22 0:c8ecd653066c 201 uint16_t sensirion_i2c_add_uint16_t_to_buffer(uint8_t* buffer, uint16_t offset,
Picard22 0:c8ecd653066c 202 uint16_t data) {
Picard22 0:c8ecd653066c 203 buffer[offset++] = (uint8_t)((data & 0xFF00) >> 8);
Picard22 0:c8ecd653066c 204 buffer[offset++] = (uint8_t)((data & 0x00FF) >> 0);
Picard22 0:c8ecd653066c 205 buffer[offset] = sensirion_i2c_generate_crc(
Picard22 0:c8ecd653066c 206 &buffer[offset - SENSIRION_WORD_SIZE], SENSIRION_WORD_SIZE);
Picard22 0:c8ecd653066c 207 offset++;
Picard22 0:c8ecd653066c 208
Picard22 0:c8ecd653066c 209 return offset;
Picard22 0:c8ecd653066c 210 }
Picard22 0:c8ecd653066c 211
Picard22 0:c8ecd653066c 212 uint16_t sensirion_i2c_add_int16_t_to_buffer(uint8_t* buffer, uint16_t offset,
Picard22 0:c8ecd653066c 213 int16_t data) {
Picard22 0:c8ecd653066c 214 return sensirion_i2c_add_uint16_t_to_buffer(buffer, offset, (uint16_t)data);
Picard22 0:c8ecd653066c 215 }
Picard22 0:c8ecd653066c 216
Picard22 0:c8ecd653066c 217 uint16_t sensirion_i2c_add_float_to_buffer(uint8_t* buffer, uint16_t offset,
Picard22 0:c8ecd653066c 218 float data) {
Picard22 0:c8ecd653066c 219 union {
Picard22 0:c8ecd653066c 220 uint32_t uint32_data;
Picard22 0:c8ecd653066c 221 float float_data;
Picard22 0:c8ecd653066c 222 } convert;
Picard22 0:c8ecd653066c 223
Picard22 0:c8ecd653066c 224 convert.float_data = data;
Picard22 0:c8ecd653066c 225
Picard22 0:c8ecd653066c 226 buffer[offset++] = (uint8_t)((convert.uint32_data & 0xFF000000) >> 24);
Picard22 0:c8ecd653066c 227 buffer[offset++] = (uint8_t)((convert.uint32_data & 0x00FF0000) >> 16);
Picard22 0:c8ecd653066c 228 buffer[offset] = sensirion_i2c_generate_crc(
Picard22 0:c8ecd653066c 229 &buffer[offset - SENSIRION_WORD_SIZE], SENSIRION_WORD_SIZE);
Picard22 0:c8ecd653066c 230 offset++;
Picard22 0:c8ecd653066c 231 buffer[offset++] = (uint8_t)((convert.uint32_data & 0x0000FF00) >> 8);
Picard22 0:c8ecd653066c 232 buffer[offset++] = (uint8_t)((convert.uint32_data & 0x000000FF) >> 0);
Picard22 0:c8ecd653066c 233 buffer[offset] = sensirion_i2c_generate_crc(
Picard22 0:c8ecd653066c 234 &buffer[offset - SENSIRION_WORD_SIZE], SENSIRION_WORD_SIZE);
Picard22 0:c8ecd653066c 235 offset++;
Picard22 0:c8ecd653066c 236
Picard22 0:c8ecd653066c 237 return offset;
Picard22 0:c8ecd653066c 238 }
Picard22 0:c8ecd653066c 239
Picard22 0:c8ecd653066c 240 uint16_t sensirion_i2c_add_bytes_to_buffer(uint8_t* buffer, uint16_t offset,
Picard22 0:c8ecd653066c 241 uint8_t* data,
Picard22 0:c8ecd653066c 242 uint16_t data_length) {
Picard22 0:c8ecd653066c 243 uint16_t i;
Picard22 0:c8ecd653066c 244
Picard22 0:c8ecd653066c 245 if (data_length % SENSIRION_WORD_SIZE != 0) {
Picard22 0:c8ecd653066c 246 return BYTE_NUM_ERROR;
Picard22 0:c8ecd653066c 247 }
Picard22 0:c8ecd653066c 248
Picard22 0:c8ecd653066c 249 for (i = 0; i < data_length; i += 2) {
Picard22 0:c8ecd653066c 250 buffer[offset++] = data[i];
Picard22 0:c8ecd653066c 251 buffer[offset++] = data[i + 1];
Picard22 0:c8ecd653066c 252
Picard22 0:c8ecd653066c 253 buffer[offset] = sensirion_i2c_generate_crc(
Picard22 0:c8ecd653066c 254 &buffer[offset - SENSIRION_WORD_SIZE], SENSIRION_WORD_SIZE);
Picard22 0:c8ecd653066c 255 offset++;
Picard22 0:c8ecd653066c 256 }
Picard22 0:c8ecd653066c 257
Picard22 0:c8ecd653066c 258 return offset;
Picard22 0:c8ecd653066c 259 }
Picard22 0:c8ecd653066c 260
Picard22 0:c8ecd653066c 261 int16_t sensirion_i2c_write_data(uint8_t address, const uint8_t* data,
Picard22 0:c8ecd653066c 262 uint16_t data_length) {
Picard22 0:c8ecd653066c 263 return sensirion_i2c_hal_write(address, data, data_length);
Picard22 0:c8ecd653066c 264 }
Picard22 0:c8ecd653066c 265
Picard22 0:c8ecd653066c 266 int16_t sensirion_i2c_read_data_inplace(uint8_t address, uint8_t* buffer,
Picard22 0:c8ecd653066c 267 uint16_t expected_data_length) {
Picard22 0:c8ecd653066c 268 int16_t error;
Picard22 0:c8ecd653066c 269 uint16_t i, j;
Picard22 0:c8ecd653066c 270 uint16_t size = (expected_data_length / SENSIRION_WORD_SIZE) *
Picard22 0:c8ecd653066c 271 (SENSIRION_WORD_SIZE + CRC8_LEN);
Picard22 0:c8ecd653066c 272
Picard22 0:c8ecd653066c 273 if (expected_data_length % SENSIRION_WORD_SIZE != 0) {
Picard22 0:c8ecd653066c 274 return BYTE_NUM_ERROR;
Picard22 0:c8ecd653066c 275 }
Picard22 0:c8ecd653066c 276
Picard22 0:c8ecd653066c 277 error = sensirion_i2c_hal_read(address, buffer, size);
Picard22 0:c8ecd653066c 278 if (error) {
Picard22 0:c8ecd653066c 279 return error;
Picard22 0:c8ecd653066c 280 }
Picard22 0:c8ecd653066c 281
Picard22 0:c8ecd653066c 282 for (i = 0, j = 0; i < size; i += SENSIRION_WORD_SIZE + CRC8_LEN) {
Picard22 0:c8ecd653066c 283
Picard22 0:c8ecd653066c 284 error = sensirion_i2c_check_crc(&buffer[i], SENSIRION_WORD_SIZE,
Picard22 0:c8ecd653066c 285 buffer[i + SENSIRION_WORD_SIZE]);
Picard22 0:c8ecd653066c 286 if (error) {
Picard22 0:c8ecd653066c 287 return error;
Picard22 0:c8ecd653066c 288 }
Picard22 0:c8ecd653066c 289 buffer[j++] = buffer[i];
Picard22 0:c8ecd653066c 290 buffer[j++] = buffer[i + 1];
Picard22 0:c8ecd653066c 291 }
Picard22 0:c8ecd653066c 292
Picard22 0:c8ecd653066c 293 return NO_ERROR;
Picard22 0:c8ecd653066c 294 }