kernels: add slider

kernels/slider/Makefile

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+NAME = slider
+SRCS = main.c image.S
+include $(AM_HOME)/Makefile

kernels/slider/image.S

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+.section .data
+.global image, image_end
+.p2align 3
+image:
+.incbin "images/projectn.bin"
+.incbin "images/litenes.bin"
+image_end:

kernels/slider/images/.gitignore

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+!*.bin

kernels/slider/main.c

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+#include <am.h>
+#include <klib.h>
+#include <klib-macros.h>
+
+extern uint32_t image[][400][300];
+extern uint32_t image_end[][400][300];
+#define NR_IMG (image_end - image)
+
+void display_image(int i) {
+  io_write(AM_GPU_FBDRAW, 0, 0, &image[i][0][0], 400, 300, true);
+}
+
+int main() {
+  ioe_init();
+
+  int i = 0;
+  unsigned long last = 0;
+  unsigned long current;
+
+  display_image(i);
+
+  while (1) {
+    current = io_read(AM_TIMER_UPTIME).us / 1000;
+    if (current - last > 5000) {
+      // change image every 5s
+      i = (i + 1) % NR_IMG;
+      display_image(i);
+      last = current;
+    }
+  }
+  return 0;
+}