Add smile demo

smile/Makefile

@@ -0,0 +1,29 @@
+
+ARMGNU = arm-none-eabi
+#ARMGNU = arm-linux-gnueabi
+
+AOPS = --warn --fatal-warnings -mcpu=cortex-m0
+COPS = -Wall -Werror -O2 -nostdlib -nostartfiles -ffreestanding  -mcpu=cortex-m0
+
+all : notmain.bin
+
+clean:
+	rm -f *.bin
+	rm -f *.o
+	rm -f *.elf
+	rm -f *.list
+
+#---------------------------------
+
+flash.o : flash.S
+	$(ARMGNU)-as $(AOPS) flash.S -o flash.o
+
+notmain.o : notmain.c
+	$(ARMGNU)-gcc $(COPS) -mthumb -c notmain.c -o notmain.o
+
+notmain.bin : flash.ld flash.o notmain.o
+	$(ARMGNU)-ld -o notmain.elf -T flash.ld flash.o notmain.o
+	$(ARMGNU)-objdump -D notmain.elf > notmain.list
+	$(ARMGNU)-objcopy notmain.elf notmain.bin -O binary
+
+

smile/README

@@ -0,0 +1,2 @@
+This is a simple demo that will create an image on the MicroBit  
+LED matrix.

smile/flash.S

@@ -0,0 +1,50 @@
+.cpu cortex-m0
+.thumb
+
+
+.thumb_func
+.global _start
+_start:
+stacktop: .word 0x20004000
+.word reset
+.word hang
+.word hang
+.word hang
+.word hang
+.word hang
+.word hang
+.word hang
+.word hang
+.word hang
+.word hang
+.word hang
+.word hang
+.word hang
+.word hang
+
+.thumb_func
+reset:
+    bl notmain
+    b hang
+
+.thumb_func
+hang:   b .
+
+.thumb_func
+.globl PUT32
+PUT32:
+    str r1,[r0]
+    bx lr
+
+.thumb_func
+.globl GET32
+GET32:
+    ldr r0,[r0]
+    bx lr
+
+.thumb_func
+.globl dummy
+dummy:
+    bx lr
+
+.end

smile/flash.ld

@@ -0,0 +1,12 @@
+MEMORY
+{
+    rom : ORIGIN = 0x00000000, LENGTH = 0x40000
+    ram : ORIGIN = 0x20000000, LENGTH = 0x4000
+}
+
+SECTIONS
+{
+    .text : { *(.text*) } > rom
+    .rodata : { *(.rodata*) } > rom
+    .bss : { *(.bss*) } > ram
+}

smile/notmain.c

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+// Formatted to allman style
+void PUT32(unsigned int, unsigned int);
+void dummy(unsigned int);
+
+#define GPIOBASE 0x50000000
+#define GPIO_OUTSET (GPIOBASE + 0x508)
+#define GPIO_OUTCLR (GPIOBASE + 0x50C)
+#define GPIO_DIRSET (GPIOBASE + 0x518)
+
+unsigned char grid[5][5][2] =
+{
+    {{13, 4},{14, 7},{13, 5},{14, 8},{13, 6}},
+    {{15, 7},{15, 8},{15, 9},{15,10},{15,11}},
+    {{14, 5},{13,12},{14, 6},{15,12},{14, 4}},
+    {{13,11},{13,10},{13, 9},{13, 8},{13, 7}},
+    {{15, 6},{14,10},{15, 4},{14, 9},{15, 5}}
+};
+
+unsigned char image[5][5] =
+{
+    {0, 1, 0, 1, 0},
+    {0, 1, 0, 1, 0},
+    {0, 0, 0, 0, 0},
+    {1, 0, 0, 0, 1},
+    {0, 1, 1, 1, 0}
+};
+
+void delay()
+{
+    for (unsigned int ra = 0; ra < 20; ra++);
+}
+
+void pixel(unsigned int x, unsigned int y)
+{
+    PUT32(GPIO_OUTSET, 1 << grid[x][y][0]);
+    PUT32(GPIO_OUTCLR, 1 << grid[x][y][1]);
+    delay();
+    PUT32(GPIO_OUTCLR, 1 << grid[x][y][0]);
+    PUT32(GPIO_OUTSET, 1 << grid[x][y][1]);
+}
+
+void notmain()
+{
+    PUT32(GPIO_DIRSET, 0xFFF0);
+    PUT32(GPIO_OUTCLR, 0xE000);
+    PUT32(GPIO_OUTSET, 0x1FF0);
+
+    while (1)
+    {
+        for (unsigned int x = 0; x < 5; x++)
+        {
+            for (unsigned int y = 0; y < 5; y++)
+            {
+                if (image[x][y])
+                {
+                    pixel(x, y);
+                }
+            }
+        }
+    }
+}