István Cserny
OLED clock using the builtin RTC of the STM32F446RE
Dependencies: mbed OLED_SSD1306_SH1106
Revision 0:696ab398b667, committed 2022-02-03
- Comitter:
- cspista
- Date:
- Thu Feb 03 14:54:24 2022 +0000
- Commit message:
- Final version
Changed in this revision
diff -r 000000000000 -r 696ab398b667 OLED_SSD1306_SH1106.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/OLED_SSD1306_SH1106.lib Thu Feb 03 14:54:24 2022 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/cspista/code/OLED_SSD1306_SH1106/#da33cca77ce5
diff -r 000000000000 -r 696ab398b667 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Feb 03 14:54:24 2022 +0000
@@ -0,0 +1,109 @@
+#include "mbed.h"
+#include "Adafruit_SSD1306.h"
+
+I2C i2c(D14,D15);
+Adafruit_SH1106_I2c oled(i2c, NC, 0x78, 64, 128); // SH1106 I2C 128x64, with no reset pin
+Serial pc(USBTX,USBRX); //UART0 via OpenSDA
+DigitalOut myled(LED1);
+Ticker myticker;
+static char msg[20]; // character buffer
+volatile uint8_t myflag = 0;
+#define DATE_20200222_222222 1582377742 // 2020/2/22 22:22:22
+
+void processSerialCommand();
+
+void setflag(void)
+{
+ myflag = 1;
+}
+
+int main()
+{
+ pc.baud(115200);
+ time_t seconds;
+ seconds = time(NULL);
+ if (seconds < DATE_20200222_222222) {
+ set_time(DATE_20200222_222222);
+ }
+ i2c.frequency(400000);
+ oled.setRotation(0);
+ oled.clearDisplay();
+ oled.setTextColor(1);
+ oled.setTextSize(1);
+ oled.setTextCursor(10,8);
+ oled.display();
+ myticker.attach(&setflag,1);
+ while(1) {
+ if(pc.readable()) {
+ processSerialCommand();
+ }
+ if(myflag) {
+ seconds = time(NULL);
+ oled.clearDisplay();
+ oled.setTextSize(1);
+ oled.setTextCursor(14,1);
+ strftime (msg, 15, "%Y-%b-%d %a ", localtime(&seconds)); // Display date
+ oled.printf("%s",msg);
+ strftime (msg, 10, "%T ", localtime(&seconds)); // Display time
+ oled.setTextSize(2);
+ oled.setTextCursor(10,12);
+ oled.printf("%s",msg);
+ oled.display();
+ pc.printf("RTC time: %s\r\n",ctime(&seconds));
+ myflag = 0;
+ }
+ }
+}
+
+void processSerialCommand()
+{
+ char c = pc.getc();
+ switch(c) {
+ case 'T':
+ // Command to set RTC time
+ // Command format: TYYMMDDHHMMSS
+ // Example: 2012 Oct 21 1:23pm is T121021132300
+ struct tm tme;
+ time_t newTime;
+
+ // Parse incomming 12 ASCII charaters into time_t
+ // no error checking for numeric values in YYMDDHHMMSS fields, so be careful!
+ c = pc.getc();
+ tme.tm_year = c - '0';
+ c = pc.getc();
+ tme.tm_year = 10*tme.tm_year;
+ tme.tm_year += c-'0';
+ tme.tm_year += 100; //Years are counted from 1900!
+ c = pc.getc();
+ tme.tm_mon = c - '0';
+ c = pc.getc();
+ tme.tm_mon = 10*tme.tm_mon;
+ tme.tm_mon += c-'0'-1; //corrected by -1 due to a stupid error
+ c = pc.getc();
+ tme.tm_mday = c - '0';
+ c = pc.getc();
+ tme.tm_mday = 10*tme.tm_mday;
+ tme.tm_mday += c-'0';
+ c = pc.getc();
+ tme.tm_hour = c - '0';
+ c = pc.getc();
+ tme.tm_hour = 10*tme.tm_hour;
+ tme.tm_hour += c-'0';
+ c = pc.getc();
+ tme.tm_min = c - '0';
+ c = pc.getc();
+ tme.tm_min = 10*tme.tm_min;
+ tme.tm_min += c-'0';
+ c = pc.getc();
+ tme.tm_sec = c - '0';
+ c = pc.getc();
+ tme.tm_sec = 10*tme.tm_sec;
+ tme.tm_sec += c-'0';
+ newTime = mktime(&tme);
+ set_time(newTime);
+ pc.printf("RTC set to: %s\r\n",ctime(&newTime));
+ }
+ while(pc.readable()) {
+ pc.getc(); // clear serial buffer
+ }
+}
diff -r 000000000000 -r 696ab398b667 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Thu Feb 03 14:54:24 2022 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400 \ No newline at end of file