commit d9ce836371d07161cf3a0263abbd0095ee9454ef
Author: Florian Loeffler <loe.florian@gmail.com>
Date:   Fri Feb 19 10:09:41 2021 +0100

    initial commit

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..77008af
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,5 @@
+all:
+	gcc uart.c
+
+clean:
+	rm uart
diff --git a/a.out b/a.out
new file mode 100755
index 0000000..59841f2
Binary files /dev/null and b/a.out differ
diff --git a/uart b/uart
new file mode 100755
index 0000000..59841f2
Binary files /dev/null and b/uart differ
diff --git a/uart.c b/uart.c
new file mode 100644
index 0000000..a322424
--- /dev/null
+++ b/uart.c
@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <termios.h>
+
+int main() {
+	
+int uart0_filestream = -1;
+uart0_filestream = open("/dev/ttyAMA0", O_RDWR | O_NOCTTY | O_NDELAY);
+if (uart0_filestream == -1) {
+	printf("[ERROR] UART open()\n");
+}
+
+struct termios options;
+tcgetattr(uart0_filestream, &options);
+	options.c_cflag = B9600 | CS8 | CLOCAL | CREAD; 
+	options.c_iflag = IGNPAR;
+	options.c_oflag = 0;
+	options.c_lflag = 0;
+tcflush(uart0_filestream, TCIFLUSH);
+tcsetattr(uart0_filestream, TCSANOW, &options);
+
+
+// Bytes senden
+unsigned char BUF_TX[20];
+unsigned char *TX;
+
+TX = &BUF_TX[0];
+*TX++ = 'R';
+/*
+*TX++ = 'a';
+*TX++ = 's';
+*TX++ = 'p';
+*TX++ = 'b';
+*TX++ = 'e';
+*TX++ = 'r';
+*TX++ = 'r';
+*TX++ = 'y';
+*TX++ = ' ';
+*TX++ = 'P';
+*TX++ = 'i';
+*/	
+if (uart0_filestream != -1)	{
+	int out = write(uart0_filestream, &BUF_TX[0], (TX - &BUF_TX[0])); // 
+	if (out < 0) {
+		printf("[ERROR] UART TX\n");
+	} else {
+        //printf("[STATUS: TX %i Bytes] %s\n", out, BUF_TX);
+	}
+} // if uart0
+
+sleep(1);
+
+// Bytes empfangen
+if (uart0_filestream != -1) {
+	unsigned char BUF_RX[50];
+	int rx_length = read(uart0_filestream, (void*)BUF_RX, 50);
+
+	if (rx_length < 0) {
+		printf("[ERROR] UART RX\n");
+	} else if (rx_length == 0) {
+		printf("[ERROR] UART RX - no data\n");
+	} else {
+		BUF_RX[rx_length] = '\0';
+		//printf("[STATUS: RX %i Bytes] %s\n", rx_length, BUF_RX);
+		printf("%s", BUF_RX);
+	} //rx_length check
+} //if uart0
+
+close(uart0_filestream);
+	
+return 0;
+}