Organize into arch, board, and ec modules

src/arch/8051/delay.c

@@ -0,0 +1,18 @@
+#include <8051.h>
+
+#include <arch/delay.h>
+#include <arch/timer.h>
+
+// One millisecond in ticks is determined as follows:
+//   9.2 MHz is the clock rate
+//   The timer divider is 12
+//   The timer rate is 12 / 9.2 MHz = 1.304 us
+//   The ticks are 1000 ms / (1.304 us) = 766.667
+//   65536 - 766.667 = 64769.33
+void delay_ms(int ms) {
+    for (int i = 0; i < ms; i++) {
+        timer_mode_1(64769);
+        timer_wait();
+        timer_stop();
+    }
+}

src/arch/8051/include/arch/delay.h

@@ -0,0 +1,6 @@
+#ifndef _ARCH_DELAY_H
+#define _ARCH_DELAY_H
+
+void delay_ms(int ms);
+
+#endif // _ARCH_DELAY_H

src/arch/8051/include/arch/reset.h

@@ -0,0 +1,6 @@
+#ifndef _ARCH_RESET_H
+#define _ARCH_RESET_H
+
+void reset(void);
+
+#endif // _ARCH_RESET_H

src/arch/8051/include/arch/timer.h

@@ -0,0 +1,8 @@
+#ifndef _ARCH_TIMER_H
+#define _ARCH_TIMER_H
+
+void timer_mode_1(int value);
+void timer_wait(void);
+void timer_stop(void);
+
+#endif // _ARCH_TIMER_H

src/arch/8051/reset.c

@@ -0,0 +1,5 @@
+#include <arch/reset.h>
+
+void reset(void) {
+    __asm__("ljmp 0");
+}

src/arch/8051/timer.c

@@ -0,0 +1,20 @@
+#include <8051.h>
+
+#include <arch/timer.h>
+
+void timer_mode_1(int value) {
+    timer_stop();
+    TMOD = 0x01;
+    TH0 = (unsigned char)(value >> 8);
+    TL0 = (unsigned char)value;
+    TR0 = 1;
+}
+
+void timer_wait(void) {
+    while (TF0 == 0) {}
+}
+
+void timer_stop(void) {
+    TR0 = 0;
+    TF0 = 0;
+}