mirror of
https://github.com/Lurkars/esp-ena.git
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121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
// Copyright 2020 Lukas Haubaum
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//
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// Licensed under the GNU Affero General Public License, Version 3;
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// https://www.gnu.org/licenses/agpl-3.0.html
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdio.h>
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#include <time.h>
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#include "driver/i2c.h"
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#include "esp_log.h"
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#include "rtc.h"
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#include "i2c-main.h"
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#include "ds3231.h"
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uint8_t ds3231_dec2bcd(uint8_t value)
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{
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return ((value / 10 * 16) + (value % 10));
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}
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uint8_t ds3231_bcd2dec(uint8_t value)
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{
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return ((value / 16 * 10) + (value % 16));
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}
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void rtc_get_time(struct tm *time)
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{
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if (!i2c_is_initialized())
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{
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i2c_main_init();
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}
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uint8_t data[7];
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i2c_cmd_handle_t cmd;
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cmd = i2c_cmd_link_create();
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (DS3231_ADDRESS << 1) | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(cmd, DS3231_TIME, true);
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (DS3231_ADDRESS << 1) | I2C_MASTER_READ, true);
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i2c_master_read(cmd, data, 7, I2C_MASTER_LAST_NACK);
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i2c_master_stop(cmd);
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ESP_ERROR_CHECK_WITHOUT_ABORT(i2c_master_cmd_begin(I2C_NUM_0, cmd, 10 / portTICK_PERIOD_MS));
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i2c_cmd_link_delete(cmd);
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time->tm_sec = ds3231_bcd2dec(data[0]);
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time->tm_min = ds3231_bcd2dec(data[1]);
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if (data[2] & DS3231_12_HOUR_FLAG)
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{
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time->tm_hour = ds3231_bcd2dec(data[2] & DS3231_12_HOUR_MASK) - 1;
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if (data[2] & DS3231_PM_HOUR_FLAG)
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{
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time->tm_hour += 12;
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}
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}
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else
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{
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time->tm_hour = ds3231_bcd2dec(data[2]);
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}
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time->tm_wday = ds3231_bcd2dec(data[3]) - 1;
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time->tm_mday = ds3231_bcd2dec(data[4]);
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time->tm_mon = ds3231_bcd2dec(data[5] & DS3231_MONTH_MASK) - 1;
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uint8_t century = (data[5] & DS3231_CENTURY_FLAG) >> 7;
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if (century)
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{
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time->tm_year = ds3231_bcd2dec(data[6]) + 100;
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}
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else
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{
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time->tm_year = ds3231_bcd2dec(data[6]);
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}
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time->tm_isdst = 0;
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}
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void rtc_set_time(struct tm *time)
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{
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if (!i2c_is_initialized())
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{
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i2c_main_init();
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}
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uint8_t data[7] = {0};
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data[0] = ds3231_dec2bcd(time->tm_sec);
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data[1] = ds3231_dec2bcd(time->tm_min);
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data[2] = ds3231_dec2bcd(time->tm_hour); // write 24h format
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data[3] = ds3231_dec2bcd(time->tm_wday + 1);
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data[4] = ds3231_dec2bcd(time->tm_mday);
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uint8_t century = 0;
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if (time->tm_year > 100)
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{
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century = DS3231_CENTURY_FLAG;
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data[6] = ds3231_dec2bcd(time->tm_year - 100);
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}
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else
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{
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data[6] = ds3231_dec2bcd(time->tm_year);
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}
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data[5] = ds3231_dec2bcd(time->tm_mon + 1) + century;
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i2c_cmd_handle_t cmd;
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cmd = i2c_cmd_link_create();
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (DS3231_ADDRESS << 1) | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(cmd, DS3231_TIME, true);
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i2c_master_write(cmd, data, 7, true);
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i2c_master_stop(cmd);
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ESP_ERROR_CHECK_WITHOUT_ABORT(i2c_master_cmd_begin(I2C_NUM_0, cmd, 10 / portTICK_PERIOD_MS));
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i2c_cmd_link_delete(cmd);
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}
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