From ff3fa235236f2d6d92f7869fb4f55e3655b0502a Mon Sep 17 00:00:00 2001
From: xengineering <me@xengineering.eu>
Date: Fri, 31 May 2024 10:33:56 +0200
Subject: firmware: Separate data link related code

---
 firmware/CMakeLists.txt  |  1 +
 firmware/src/data_link.c | 24 ++++++++++++++++++++++++
 firmware/src/data_link.h | 10 ++++++++++
 firmware/src/main.c      | 32 ++++----------------------------
 4 files changed, 39 insertions(+), 28 deletions(-)
 create mode 100644 firmware/src/data_link.c
 create mode 100644 firmware/src/data_link.h

diff --git a/firmware/CMakeLists.txt b/firmware/CMakeLists.txt
index 8af1e4a..0a18295 100644
--- a/firmware/CMakeLists.txt
+++ b/firmware/CMakeLists.txt
@@ -4,4 +4,5 @@ project(iot-core)
 
 target_sources(app PRIVATE
 	src/main.c
+	src/data_link.c
 	src/eui64.c)
diff --git a/firmware/src/data_link.c b/firmware/src/data_link.c
new file mode 100644
index 0000000..a6d091a
--- /dev/null
+++ b/firmware/src/data_link.c
@@ -0,0 +1,24 @@
+#include <zephyr/drivers/uart.h>
+
+#include "data_link.h"
+
+void dl_send_frame(const struct device *const uart_dev, uint8_t *buffer,
+                   size_t len) {
+	for (size_t i = 0; i < len; i++) {
+		uint8_t octet = *(buffer + i);
+		switch (octet) {
+			case DL_SLIP_END:
+				uart_poll_out(uart_dev, DL_SLIP_ESC);
+				uart_poll_out(uart_dev, DL_SLIP_ESC_END);
+				break;
+			case DL_SLIP_ESC:
+				uart_poll_out(uart_dev, DL_SLIP_ESC);
+				uart_poll_out(uart_dev, DL_SLIP_ESC_ESC);
+				break;
+			default:
+				uart_poll_out(uart_dev, octet);
+				break;
+		}
+	}
+	uart_poll_out(uart_dev, DL_SLIP_END);
+}
diff --git a/firmware/src/data_link.h b/firmware/src/data_link.h
new file mode 100644
index 0000000..359cb2b
--- /dev/null
+++ b/firmware/src/data_link.h
@@ -0,0 +1,10 @@
+#include <sys/types.h>
+#include <zephyr/device.h>
+
+#define DL_SLIP_END     0xC0
+#define DL_SLIP_ESC     0xDB
+#define DL_SLIP_ESC_END 0xDC
+#define DL_SLIP_ESC_ESC 0xDD
+
+void dl_send_frame(const struct device *const uart_dev, uint8_t *buffer,
+                   size_t len);
diff --git a/firmware/src/main.c b/firmware/src/main.c
index dedd603..18e4564 100644
--- a/firmware/src/main.c
+++ b/firmware/src/main.c
@@ -1,39 +1,15 @@
 #include <stdbool.h>
-#include <stdint.h>
 
 #include <zephyr/device.h>
 #include <zephyr/drivers/uart.h>
 #include <zephyr/kernel.h>
 #include <zephyr/sys/util.h>
 
+#include "data_link.h"
+
 #define UART_DEVICE_NODE DT_CHOSEN(zephyr_shell_uart)
 static const struct device *const uart_dev = DEVICE_DT_GET(UART_DEVICE_NODE);
 
-#define SLIP_END         0xC0
-#define SLIP_ESC         0xDB
-#define SLIP_ESC_END     0xDC
-#define SLIP_ESC_ESC     0xDD
-
-void send_frame(uint8_t *buffer, size_t len) {
-	for (size_t i = 0; i < len; i++) {
-		uint8_t octet = *(buffer + i);
-		switch (octet) {
-			case SLIP_END:
-				uart_poll_out(uart_dev, SLIP_ESC);
-				uart_poll_out(uart_dev, SLIP_ESC_END);
-				break;
-			case SLIP_ESC:
-				uart_poll_out(uart_dev, SLIP_ESC);
-				uart_poll_out(uart_dev, SLIP_ESC_ESC);
-				break;
-			default:
-				uart_poll_out(uart_dev, octet);
-				break;
-		}
-	}
-	uart_poll_out(uart_dev, SLIP_END);
-}
-
 int main(void)
 {
 	if (!device_is_ready(uart_dev)) {
@@ -41,11 +17,11 @@ int main(void)
 		return 0;
 	}
 
-	uint8_t frame[] = {0xDE, SLIP_END, SLIP_ESC, 0xAD};
+	uint8_t frame[] = {0xDE, DL_SLIP_END, DL_SLIP_ESC, 0xAD};
 
 	while (true) {
 		k_sleep(K_MSEC(1000));
-		send_frame(frame, ARRAY_SIZE(frame));
+		dl_send_frame(uart_dev, frame, ARRAY_SIZE(frame));
 	}
 
 	return 0;
-- 
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