1 files changed, 38 insertions, 0 deletions
diff --git a/openpcd/firmware/src/os/pit.c b/openpcd/firmware/src/os/pit.c
new file mode 100644
index 0000000..409faef
--- /dev/null
+++ b/openpcd/firmware/src/os/pit.c
@@ -0,0 +1,38 @@
+
+
+#include <errno.h>
+#include <sys/types.h>
+#include <lib_AT91SAM7.h>
+#include <AT91SAM7.h>
+#include "../openpcd.h"
+
+/* PIT runs at MCK/16 (= 3MHz) */
+#define PIV_MS(x)		(x * 3000)
+
+static void pit_irq(void)
+{
+	/* FIXME: do something */	
+}
+
+void pit_mdelay(u_int32_t ms)
+{
+	u_int32_t end;
+
+	end = (AT91F_PITGetPIIR(AT91C_BASE_PITC) + ms) % 20;
+
+	while (end < AT91F_PITGetPIIR(AT91C_BASE_PITC)) { }
+}
+
+void pit_init(void)
+{
+	AT91F_PITC_CfgPMC();
+
+	AT91F_PITInit(AT91C_BASE_PITC, 1000 /* uS */, 48 /* MHz */);
+
+	AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_SYS,
+			      OPENPCD_IRQ_PRIO_PIT,
+			      AT91C_AIC_SRCTYPE_INT_POSITIVE_EDGE,
+			      &pit_irq);
+
+	//AT91F_PITEnableInt(AT91C_BASE_PITC);
+}