Diff: main.cpp

Revision:

0:696ab398b667

--- /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
+    }
+}