ioport: Added an IRQ for the port pin direction changes

[simavr] / simavr / sim / avr_ioport.c

diff --git a/simavr/sim/avr_ioport.c b/simavr/sim/avr_ioport.c
index be30652..010e62e 100644 (file)
--- a/simavr/sim/avr_ioport.c
+++ b/simavr/sim/avr_ioport.c
@@ -64,6 +64,18 @@ static void avr_ioport_pin_write(struct avr_t * avr, avr_io_addr_t addr, uint8_t
        avr_ioport_write(avr, p->r_port, avr->data[p->r_port] ^ v, param);
 }
 
+/*
+ * This is a the callback for the DDR register. There is nothing much to do here, apart
+ * from triggering an IRQ in case any 'client' code is interested in the information.
+ */
+static void avr_ioport_ddr_write(struct avr_t * avr, avr_io_addr_t addr, uint8_t v, void * param)
+{
+       avr_ioport_t * p = (avr_ioport_t *)param;
+
+       avr_raise_irq(p->io.irq + IOPORT_IRQ_DIRECTION_ALL, v);
+       avr_core_watch_write(avr, addr, v);
+}
+
 /*
  * this is our "main" pin change callback, it can be triggered by either the
  * AVR code, or any external piece of code that see fit to do it.
@@ -172,5 +184,6 @@ void avr_ioport_init(avr_t * avr, avr_ioport_t * p)
        avr_register_io_write(avr, p->r_port, avr_ioport_write, p);
        avr_register_io_read(avr, p->r_pin, avr_ioport_read, p);
        avr_register_io_write(avr, p->r_pin, avr_ioport_pin_write, p);
+       avr_register_io_write(avr, p->r_ddr, avr_ioport_ddr_write, p);
 }