István Cserny / Mbed 2 deprecated Lab06_oled_clock

OLED clock using the builtin RTC of the STM32F446RE

Dependencies:   mbed OLED_SSD1306_SH1106

main.cpp@0:696ab398b667, 2022-02-03 (annotated)

Committer:
cspista
Date:
Thu Feb 03 14:54:24 2022 +0000
Revision:
0:696ab398b667
Final version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cspista 0:696ab398b667 1 #include "mbed.h"
cspista 0:696ab398b667 2 #include "Adafruit_SSD1306.h"
cspista 0:696ab398b667 3
cspista 0:696ab398b667 4 I2C i2c(D14,D15);
cspista 0:696ab398b667 5 Adafruit_SH1106_I2c oled(i2c, NC, 0x78, 64, 128); // SH1106 I2C 128x64, with no reset pin
cspista 0:696ab398b667 6 Serial pc(USBTX,USBRX); //UART0 via OpenSDA
cspista 0:696ab398b667 7 DigitalOut myled(LED1);
cspista 0:696ab398b667 8 Ticker myticker;
cspista 0:696ab398b667 9 static char msg[20]; // character buffer
cspista 0:696ab398b667 10 volatile uint8_t myflag = 0;
cspista 0:696ab398b667 11 #define DATE_20200222_222222 1582377742 // 2020/2/22 22:22:22
cspista 0:696ab398b667 12
cspista 0:696ab398b667 13 void processSerialCommand();
cspista 0:696ab398b667 14
cspista 0:696ab398b667 15 void setflag(void)
cspista 0:696ab398b667 16 {
cspista 0:696ab398b667 17 myflag = 1;
cspista 0:696ab398b667 18 }
cspista 0:696ab398b667 19
cspista 0:696ab398b667 20 int main()
cspista 0:696ab398b667 21 {
cspista 0:696ab398b667 22 pc.baud(115200);
cspista 0:696ab398b667 23 time_t seconds;
cspista 0:696ab398b667 24 seconds = time(NULL);
cspista 0:696ab398b667 25 if (seconds < DATE_20200222_222222) {
cspista 0:696ab398b667 26 set_time(DATE_20200222_222222);
cspista 0:696ab398b667 27 }
cspista 0:696ab398b667 28 i2c.frequency(400000);
cspista 0:696ab398b667 29 oled.setRotation(0);
cspista 0:696ab398b667 30 oled.clearDisplay();
cspista 0:696ab398b667 31 oled.setTextColor(1);
cspista 0:696ab398b667 32 oled.setTextSize(1);
cspista 0:696ab398b667 33 oled.setTextCursor(10,8);
cspista 0:696ab398b667 34 oled.display();
cspista 0:696ab398b667 35 myticker.attach(&setflag,1);
cspista 0:696ab398b667 36 while(1) {
cspista 0:696ab398b667 37 if(pc.readable()) {
cspista 0:696ab398b667 38 processSerialCommand();
cspista 0:696ab398b667 39 }
cspista 0:696ab398b667 40 if(myflag) {
cspista 0:696ab398b667 41 seconds = time(NULL);
cspista 0:696ab398b667 42 oled.clearDisplay();
cspista 0:696ab398b667 43 oled.setTextSize(1);
cspista 0:696ab398b667 44 oled.setTextCursor(14,1);
cspista 0:696ab398b667 45 strftime (msg, 15, "%Y-%b-%d %a ", localtime(&seconds)); // Display date
cspista 0:696ab398b667 46 oled.printf("%s",msg);
cspista 0:696ab398b667 47 strftime (msg, 10, "%T ", localtime(&seconds)); // Display time
cspista 0:696ab398b667 48 oled.setTextSize(2);
cspista 0:696ab398b667 49 oled.setTextCursor(10,12);
cspista 0:696ab398b667 50 oled.printf("%s",msg);
cspista 0:696ab398b667 51 oled.display();
cspista 0:696ab398b667 52 pc.printf("RTC time: %s\r\n",ctime(&seconds));
cspista 0:696ab398b667 53 myflag = 0;
cspista 0:696ab398b667 54 }
cspista 0:696ab398b667 55 }
cspista 0:696ab398b667 56 }
cspista 0:696ab398b667 57
cspista 0:696ab398b667 58 void processSerialCommand()
cspista 0:696ab398b667 59 {
cspista 0:696ab398b667 60 char c = pc.getc();
cspista 0:696ab398b667 61 switch(c) {
cspista 0:696ab398b667 62 case 'T':
cspista 0:696ab398b667 63 // Command to set RTC time
cspista 0:696ab398b667 64 // Command format: TYYMMDDHHMMSS
cspista 0:696ab398b667 65 // Example: 2012 Oct 21 1:23pm is T121021132300
cspista 0:696ab398b667 66 struct tm tme;
cspista 0:696ab398b667 67 time_t newTime;
cspista 0:696ab398b667 68
cspista 0:696ab398b667 69 // Parse incomming 12 ASCII charaters into time_t
cspista 0:696ab398b667 70 // no error checking for numeric values in YYMDDHHMMSS fields, so be careful!
cspista 0:696ab398b667 71 c = pc.getc();
cspista 0:696ab398b667 72 tme.tm_year = c - '0';
cspista 0:696ab398b667 73 c = pc.getc();
cspista 0:696ab398b667 74 tme.tm_year = 10*tme.tm_year;
cspista 0:696ab398b667 75 tme.tm_year += c-'0';
cspista 0:696ab398b667 76 tme.tm_year += 100; //Years are counted from 1900!
cspista 0:696ab398b667 77 c = pc.getc();
cspista 0:696ab398b667 78 tme.tm_mon = c - '0';
cspista 0:696ab398b667 79 c = pc.getc();
cspista 0:696ab398b667 80 tme.tm_mon = 10*tme.tm_mon;
cspista 0:696ab398b667 81 tme.tm_mon += c-'0'-1; //corrected by -1 due to a stupid error
cspista 0:696ab398b667 82 c = pc.getc();
cspista 0:696ab398b667 83 tme.tm_mday = c - '0';
cspista 0:696ab398b667 84 c = pc.getc();
cspista 0:696ab398b667 85 tme.tm_mday = 10*tme.tm_mday;
cspista 0:696ab398b667 86 tme.tm_mday += c-'0';
cspista 0:696ab398b667 87 c = pc.getc();
cspista 0:696ab398b667 88 tme.tm_hour = c - '0';
cspista 0:696ab398b667 89 c = pc.getc();
cspista 0:696ab398b667 90 tme.tm_hour = 10*tme.tm_hour;
cspista 0:696ab398b667 91 tme.tm_hour += c-'0';
cspista 0:696ab398b667 92 c = pc.getc();
cspista 0:696ab398b667 93 tme.tm_min = c - '0';
cspista 0:696ab398b667 94 c = pc.getc();
cspista 0:696ab398b667 95 tme.tm_min = 10*tme.tm_min;
cspista 0:696ab398b667 96 tme.tm_min += c-'0';
cspista 0:696ab398b667 97 c = pc.getc();
cspista 0:696ab398b667 98 tme.tm_sec = c - '0';
cspista 0:696ab398b667 99 c = pc.getc();
cspista 0:696ab398b667 100 tme.tm_sec = 10*tme.tm_sec;
cspista 0:696ab398b667 101 tme.tm_sec += c-'0';
cspista 0:696ab398b667 102 newTime = mktime(&tme);
cspista 0:696ab398b667 103 set_time(newTime);
cspista 0:696ab398b667 104 pc.printf("RTC set to: %s\r\n",ctime(&newTime));
cspista 0:696ab398b667 105 }
cspista 0:696ab398b667 106 while(pc.readable()) {
cspista 0:696ab398b667 107 pc.getc(); // clear serial buffer
cspista 0:696ab398b667 108 }
cspista 0:696ab398b667 109 }