+/*
+ * This small section tells simavr to generate a VCD trace dump with changes to these
+ * registers.
+ * Opening it with gtkwave will show you the data being pumped out into the data register
+ * UDR0, and the UDRE0 bit being set, then cleared
+ */
+const struct avr_mmcu_vcd_trace_t _mytrace[] _MMCU_ = {
+ { AVR_MCU_VCD_SYMBOL("UDR0"), .what = (void*)&UDR0, },
+ { AVR_MCU_VCD_SYMBOL("UDRE0"), .mask = (1 << UDRE0), .what = (void*)&UCSR0A, },
+ { AVR_MCU_VCD_SYMBOL("GPIOR1"), .what = (void*)&GPIOR1, },
+};
+
+static int uart_putchar(char c, FILE *stream)
+{
+ if (c == '\n')