From c745cd330fcf30f4ffe3542c5167e96caa3f33dd Mon Sep 17 00:00:00 2001
From: Ain <41307858+nero@users.noreply.github.com>
Date: Mon, 29 Jan 2018 19:29:02 +0000
Subject: [PATCH] Add uart synchronous transmit

---
 drivers/uart_tx.c | 13 +++++++++++++
 drivers/uart_tx.h |  1 +
 2 files changed, 14 insertions(+)
 create mode 100644 drivers/uart_tx.c
 create mode 100644 drivers/uart_tx.h

diff --git a/drivers/uart_tx.c b/drivers/uart_tx.c
new file mode 100644
index 0000000..6f9df31
--- /dev/null
+++ b/drivers/uart_tx.c
@@ -0,0 +1,13 @@
+#include "uart_tx.h"
+#include "uart.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+void __attribute__ ((naked)) __attribute__ ((section (".init6"))) uart_tx_init() {
+  UCSR0B |= (1<<TXEN0);
+}
+
+void uart_putc(unsigned char c) {
+        while( ( UCSR0A & ( 1 << UDRE0 ) ) == 0 ) {}
+        UDR0 = c;
+}
diff --git a/drivers/uart_tx.h b/drivers/uart_tx.h
new file mode 100644
index 0000000..5a0caeb
--- /dev/null
+++ b/drivers/uart_tx.h
@@ -0,0 +1 @@
+void uart_putc(unsigned char c);