Add implementation of USART and more ground changes

1 files changed, 25 insertions, 0 deletions

diff --git a/examples/usartecho/echo.c b/examples/usartecho/echo.c
new file mode 100644
index 0000000..4d978f7
--- /dev/null
+++ b/examples/usartecho/echo.c
@@ -0,0 +1,25 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include <string.h>
+#include "../../usart.h"
+
+void rec(uint8_t data) {
+    if (data)
+        usart_send(data);
+}
+
+int main() {
+    DDRB |= _BV(DDB1) | _BV(DDB2);
+    usart_init_uart();
+    SREG |= _BV(7);
+    usart_send('a');
+    usart_send('b');
+    usart_send('c');
+    usart_send('d');
+    usart_send_str("\n\rHello, there is UART echo!\n\r");
+    usart_receive = rec;
+
+    while (1);
+}
+
+