initial stc rpn calculator project

src/main.c

@@ -0,0 +1,62 @@
+//
+// STC15 RPN calculator
+//
+
+#include "stc15.h"
+#include <stdint.h>
+#include "lcd.h"
+#include "utils.h"
+
+#define FOSC 11059200
+
+// clear wdt
+#define WDT_CLEAR() (WDT_CONTR |= 1 << 4)
+void timer0_isr() __interrupt 1 __using 1
+{
+	P3_1 ^= 1;
+}
+
+
+// Call timer0_isr() 10000/sec: 0.0001 sec
+// Initialize the timer count so that it overflows after 0.0001 sec
+// THTL = 0x10000 - FOSC / 12 / 10000 = 0x10000 - 92.16 = 65444 = 0xFFA4
+void Timer0Init(void)		//100us @ 11.0592MHz
+{
+	// TMOD = 0;	// default: 16-bit auto-reload
+	// AUXR = 0;	// default: traditional 8051 timer frequency of FOSC / 12
+	// Initial values of TL0 and TH0 are stored in hidden reload registers: RL_TL0 and RL_TH0
+	TL0 = 0xA4;		// Initial timer value
+	TH0 = 0xFF;		// Initial timer value
+	TF0 = 0;		// Clear overflow flag
+	TR0 = 1;		// Timer0 start run
+	ET0 = 1;		// Enable timer0 interrupt
+	EA  = 1;		// Enable global interrupt
+}
+
+
+char buf[17];
+
+/*********************************************/
+int main()
+{
+	uint32_t i;
+	Timer0Init(); // display refresh & switch read
+	LCD_Open();
+	P3_4 = 0; //turn on led backlight
+	LCD_OutString("Hello world !!!!");
+	LCD_GoTo(1,0);
+	LCD_OutString(".......");
+
+	i = 0;
+	// LOOP
+	while (1)
+	{
+		LCD_GoTo(1,7);
+		LCD_OutString(u32str(i, buf, 10));
+		i++;
+
+		WDT_CLEAR();
+	}
+}
+/* ------------------------------------------------------------------------- */
+