8000 Merge pull request #635 from menesesleonardo/patch-1 · mike2nl/esp32-snippets@297db2c · GitHub
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nkolbannkolban
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Merge pull request nkolban#635 from menesesleonardo/patch-1
Create pcf8523
2 parents ed1de4b + 1d976d2 commit 297db2c

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‎hardware/rtc/pcf8523.c

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#include <apps/sntp/sntp.h>
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#include <driver/i2c.h>
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#include <esp_log.h>
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#include <freertos/FreeRTOS.h>
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#include <freertos/task.h>
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#include <lwip/sockets.h>
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#include <stdio.h>
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#include <time.h>
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#include "errorhandle_func.h"
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#include "sdkconfig.h"
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#define SDA_PIN 23
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#define SCL_PIN 22
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#define RTC_ADDRESS 0x68 // most I2C rtcs have their address on 0x68. any doubt check with i2c scanner snippet
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static char tag[] = "RTC";
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static uint8_t intToBCD(uint8_t num) {
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return ((num / 10) << 4) | (num%10);
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}
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static uint8_t bcdToInt(uint8_t bcd) {
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// 0x10
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return ((bcd >> 4) * 10) + (bcd & 0x0f);;
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}
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void initI2C() {
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i2c_config_t conf;
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conf.mode = I2C_MODE_MASTER;
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conf.sda_io_num = SDA_PIN;
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conf.scl_io_num = SCL_PIN;
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conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
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conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
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conf.master.clk_speed = 100000;
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ESP_ERROR_CHECK(i2c_param_config(I2C_NUM_0, &conf));
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ESP_ERROR_CHECK(i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, 0, 0, 0));
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}
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/*
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* PCF8523 slightly changed its 7 bytes encoded in BCD:
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* 03h - Seconds - 00-59
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* 04h - Minutes - 00-59
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* 05h - Hours - 00-23
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* 06h - monthday - 01-31
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* 07h - weekday - 00-06
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* 08h - Month - 01-12
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* 09h - Year - 00-99
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*
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*/
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time_t rtc_readValue() {
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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ESP_ERROR_CHECK(i2c_master_start(cmd));
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, (RTC_ADDRESS << 1) | I2C_MASTER_WRITE, true /* expect ack */));
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, 0x03, 1)); // start address
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ESP_ERROR_CHECK(i2c_master_start(cmd));
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, (RTC_ADDRESS << 1) | I2C_MASTER_READ, true /* expect ack */));
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uint8_t data[7];
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ESP_ERROR_CHECK(i2c_master_read(cmd, data, 7, false));
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ESP_ERROR_CHECK(i2c_master_stop(cmd));
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COMMANDCHECKOKERR(i2c_master_cmd_begin(I2C_NUM_0, cmd, 1000/portTICK_PERIOD_MS),"RTC COMMAND");
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i2c_cmd_link_delete(cmd);
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int i;
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for (i=0; i<7; i++) {
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ESP_LOGD(tag, "%d: 0x%.2x", i, data[i]);
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}
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struct tm tm;
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tm.tm_sec = bcdToInt(data[0]);
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tm.tm_min = bcdToInt(data[1]);
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tm.tm_hour = bcdToInt(data[2]);
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tm.tm_mday = bcdToInt(data[3]);
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tm.tm_mon = bcdToInt(data[5]) - 1; // 0-11 - Note: The month on the PCF8523 is 1-12.
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tm.tm_year = bcdToInt(data[6]) + 100; // Years since 1900
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time_t readTime = mktime(&tm);
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return readTime;
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}
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void rtc_writeValue(time_t newTime) {
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ESP_LOGD(tag, ">> writeValue: %ld", newTime);
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struct tm tm;
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gmtime_r(&newTime, &tm);
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char buf[30];
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ESP_LOGD(tag, " - %s", asctime_r(&tm, buf));
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esp_err_t errRc;
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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ESP_ERROR_CHECK(i2c_master_start(cmd));
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, (RTC_ADDRESS << 1) | I2C_MASTER_WRITE, 1 /* expect ack */));
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, 0x03, 1));
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, intToBCD(tm.tm_sec), 1)); // seconds
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, intToBCD(tm.tm_min), 1 )); // minutes
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, intToBCD(tm.tm_hour), 1 )); // hours
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, intToBCD(tm.tm_mday), 1)); // date of month
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, intToBCD(tm.tm_wday+1), 1 )); // week day
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, intToBCD(tm.tm_mon+1), 1)); // month
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ESP_ERROR_CHECK(i2c_master_write_byte(cmd, intToBCD(tm.tm_year-100), 1)); // year
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ESP_ERROR_CHECK(i2c_master_stop(cmd));
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errRc = i2c_master_cmd_begin(I2C_NUM_0, cmd, 1000/portTICK_PERIOD_MS);
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if (errRc != 0) {
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ESP_LOGE(tag, "i2c_master_cmd_begin: %d", errRc);
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}
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i2c_cmd_link_delete(cmd);
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}
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/*
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implement in your time function
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@Kolban created a nice one, here is my contribution.
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esp_err_t sntp_update(){
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static const char *tag = "TIME_SETUP";
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esp_err_t ret;
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char buffer[20];
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EventBits_t bitreturn;
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TickType_t waittime = 10000/portTICK_PERIOD_MS;
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bitreturn = xEventGroupWaitBits(event_group, WIFI_CONNECTED_BIT, pdFALSE, pdTRUE, waittime);
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if((bitreturn & BIT0) != 0){
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printf("going online\n");
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}
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else printf("going offline\n");
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// initialize the SNTP service
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sntp_setoperatingmode(SNTP_OPMODE_POLL);
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// to create SNTP server variable make a #define statement i.e. "pool.ntp.org"
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sntp_setservername(0, CONFIG_SNTP_SERVER);
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sntp_init();
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initI2C();
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time_t t;
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struct tm timertc;
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t = rtc_readValue();
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localtime_r(&t, &timertc);
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strftime(buffer, sizeof(buffer), "%Y/%m/%d %H:%M:%S", &timertc);
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ESP_LOGI(tag,"Current time in rtc (GTM) is: %s\n\n", buffer);
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// wait for the service to set the time
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time_t now;
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struct tm timeinfo;
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time(&now);
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localtime_r(&now, &timeinfo);
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int counter = 0;
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// try for a minute to get time from network
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while((timeinfo.tm_year < (2018 - 1900)) && (counter < 12))
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{
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ESP_LOGW(tag,"Time outdated, waiting...\n");
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vTaskDelay(5000 / portTICK_PERIOD_MS);
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time(&now);
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localtime_r(&now, &timeinfo);
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counter ++;
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}
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if((timeinfo.tm_year < (2018 - 1900)) && (counter == 12)){
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ESP_LOGE(tag, "TIMEOUT");
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// stick to rtc time
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now = rtc_readValue();
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}
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else{
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// update rtc time
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rtc_writeValue(now);
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}
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// to create timezone variable make a #define statement i.e. "COT+5"
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setenv("TZ",CONFIG_TIMEZONE_TZ, 1);
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tzset();
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// print the actual time in location
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localtime_r(&now, &timeinfo);
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strftime(buffer, sizeof(buffer), "%Y/%m/%d %H:%M:%S", &timeinfo);
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ESP_LOGI(tag,"Current time in your Location: %s\n\n", buffer);
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// check time set in rtc in case it was updated from network
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t = rtc_readValue();
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localtime_r(&t, &timertc);
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strftime(buffer, sizeof(buffer), "%Y/%m/%d %H:%M:%S", &timertc);
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ESP_LOGI(tag,"Current time in rtc (GTM) is: %s\n\n", buffer);
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ret = ESP_OK;
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return ret;
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}
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*/

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