X-Git-Url: https://hackdaworld.org/gitweb/?p=my-code%2Farm.git;a=blobdiff_plain;f=betty%2Fsystem.c;fp=betty%2Fsystem.c;h=487680243b87fb1bb14af1b80d3ab19f16333cdc;hp=0000000000000000000000000000000000000000;hb=b4ca71fc214ba3c58cec25661ba1f81cf7b1b871;hpb=d6814c7408b23db8a441f731b44d4b638df24c64

diff --git a/betty/system.c b/betty/system.c
new file mode 100644
index 0000000..4876802
--- /dev/null
+++ b/betty/system.c
@@ -0,0 +1,39 @@
+/*
+ * system.c - misc system specific stuff
+ *
+ * author: hackbard@hackdaworld.org
+ *
+ */
+
+#include "system.h"
+
+/*
+ * functions
+ */
+
+void mmap_init(u8 memtype) {
+
+	MEMMAP=memtype;
+}
+
+void pll_init(void) {
+
+	/* configuration */
+	PLLCFG=0x42;	// multiplier = 3 (for cclk), dividor = 4 (for f_cco)
+	PLLCON=0x03;	// enable and set as clk source for the lpc
+
+	/* feed sequence */
+	PLLFEED=0xaa;
+	PLLFEED=0x55;
+
+	/* wait for lock */
+	while(!(PLLSTAT&(1<<10)))
+		continue;
+}
+
+void pause(int cnt) {
+
+	while(cnt--)
+		asm volatile ("nop");
+}
+