Adding a simple plasma example read write char short int, adding simulations

for this example

plasma/gpio/Makefile

@@ -0,0 +1,43 @@
+VHDL_DIR  = ../logic
+TOOLS_DIR = ../bin
+LIB_DIR   = ../lib
+TARGET    = gpio
+CROSS     = mips-elf
+GCC       = $(CROSS)-gcc
+AS        = $(CROSS)-as
+LD        = $(CROSS)-ld
+DUMP      = $(CROSS)-objdump
+OBJCOPY   = $(CROSS)-objcopy
+INC_PATH  = ../include
+CFLAGS    = -O2 -I$(INC_PATH) -Wall -c -s 
+ILDFLAGS  = -Ttext 0 -eentry -Map $@.map -s -N
+LDFLAGS   = -Ttext 0x10000000 -eentry -Map $@.map -s -N
+
+#Internal RAM 0x00
+#External RAM 0x10000000
+
+vpath %.c $(LIB_DIR)
+vpath %.S $(LIB_DIR)
+
+.c.o:
+	$(GCC) $(CFLAGS) $< 
+.S.o:
+	$(AS)  -o $@ $< 
+
+all: $(TARGET)
+
+clean: 
+	-rm -rf *.o *.txt *.map *.lst *.bin opcodes_iram opcodes_ram test bootldr $(TARGET)
+
+$(TARGET): crt0.o $(TARGET).o no_os.o ddr_init.o
+	$(LD) $(ILDFLAGS) -o $@ $^
+	$(OBJCOPY) -I elf32-big -O binary $@ $@.bin
+
+vhdl_mem: $(TARGET)
+	$(TOOLS_DIR)/ramimage $(VHDL_DIR)/ram_xilinx.vhd $^.bin $(VHDL_DIR)/ram_image.vhd
+
+upload: $(TARGET)
+	sudo cat $^.bin > /dev/ttyUSB0
+
+run: $(TARGET)
+	$(TOOLS_DIR)/mlite $^.bin 

plasma/gpio/gpio.c

@@ -0,0 +1,61 @@
+#include "plasma.h"
+
+#define MemoryRead(A) (*(volatile unsigned long*)(A))
+#define MemoryWrite(A,V) *(volatile unsigned long*)(A)=(V)
+
+typedef unsigned long uint32;
+typedef unsigned short uint16;
+
+
+int main(void)
+{
+  volatile unsigned char    *data8; 
+  volatile unsigned short   *data16;
+  volatile unsigned int     *data32;
+
+  unsigned char    test8; 
+  unsigned short   test16;
+  unsigned int     test32, tmp;
+
+  data8  = (unsigned char  *)(0x20001000);
+  data16 = (unsigned short *)(0x20002000);
+  data32 = (unsigned int   *)(0x20003000);
+
+  *data8  = 0x10;
+  data8++;
+  *data8  = 0x11;
+  data8++;
+  *data8  = 0x12;
+  data8++;
+  *data8  = 0x13;
+  data8++;
+  *data8  = 0x14;
+
+  *data16 = 0x2020;
+  data16++;
+  *data16 = 0x2121;
+  data16++;
+  *data16 = 0x2222;
+  data16++;
+
+  *data32 = 0x30303030;
+
+  test8  = *data8;
+  test16 = *data16;
+  test32 = *data32;
+  data8 += 4;
+  data16++;
+  data32++;
+  test8  = *data8;
+  test16 = *data16;
+  test32 = *data32;
+
+
+
+  tmp = test8 + test16 + test32; 
+
+  *data32 = 0xAAAAAAAA;
+
+  return 0;
+}
+