Created xua_buffer.h.

Added dummy hw config calls to simple app.
Tmp added gpio_access

examples/app_xua_simple/src/gpio_access.c

@@ -0,0 +1,50 @@
+#include "gpio_access.h"
+//#include "swlock.h"
+#include <xs1.h>
+
+//swlock_t gpo_swlock = SWLOCK_INITIAL_VALUE;
+
+void p_gpio_lock()
+{
+    //swlock_acquire(&gpo_swlock);
+}
+
+void p_gpio_unlock()
+{
+    //swlock_release(&gpo_swlock);
+}
+
+unsigned p_gpio_peek()
+{
+    unsigned portId, x;
+
+    // Wrapped in lock to ensure it's safe from multiple logical cores
+   // swlock_acquire(&gpo_swlock);
+
+    asm("ldw %0, dp[p_gpio]":"=r"(portId));
+    asm volatile("peek %0, res[%1]":"=r"(x):"r"(portId));
+
+    return x;
+}
+
+void p_gpio_out(unsigned x)
+{
+    unsigned portId;
+
+    asm("ldw %0, dp[p_gpio]":"=r"(portId));
+    asm volatile("out res[%0], %1"::"r"(portId),"r"(x));
+
+    // Wrapped in lock to ensure it's safe from multiple logical cores
+    //swlock_release(&gpo_swlock);
+}
+
+void set_gpio(unsigned bit, unsigned value)
+{
+	unsigned port_shadow;
+	port_shadow = p_gpio_peek();         // Read port pin value
+	if (value == 0) port_shadow &= ~bit; // If writing a 0, generate mask and AND with current val
+	else port_shadow |= bit;             // Else use mask and OR to set bit
+	p_gpio_out(port_shadow);             // Write back to port. Will make port an output if not already
+}
+
+