Adding plasma example

plasma/lib/no_os.c

@@ -0,0 +1,54 @@
+#include "plasma.h"
+
+#define MemoryRead(A) (*(volatile unsigned int*)(A))
+#define MemoryWrite(A,V) *(volatile unsigned int*)(A)=(V)
+
+int putchar(int value)
+{
+   while((MemoryRead(IRQ_STATUS) & IRQ_UART_WRITE_AVAILABLE) == 0)
+      ;
+   MemoryWrite(UART_WRITE, value);
+   return 0;
+}
+
+int puts(const char *string)
+{
+   while(*string)
+   {
+      if(*string == '\n')
+         putchar('\r');
+      putchar(*string++);
+   }
+   return 0;
+}
+
+void print_hex(unsigned long num)
+{
+   long i;
+   unsigned long j;
+   for(i = 28; i >= 0; i -= 4) 
+   {
+      j = (num >> i) & 0xf;
+      if(j < 10) 
+         putchar('0' + j);
+      else 
+         putchar('a' - 10 + j);
+   }
+}
+
+void OS_InterruptServiceRoutine(unsigned int status)
+{
+   (void)status;
+   putchar('I');
+}
+
+int kbhit(void)
+{
+   return MemoryRead(IRQ_STATUS) & IRQ_UART_READ_AVAILABLE;
+}
+
+int getch(void)
+{
+   while(!kbhit()) ;
+   return MemoryRead(UART_READ);
+}