.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/Display_Avr_3.iml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="CPP_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/Display_Avr_3.iml" filepath="$PROJECT_DIR$/.idea/Display_Avr_3.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

hdlc/hdlc.c

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+#include "hdlc.h"
+#include <string.h>
+
+#include "setup.h"
+
+__weak void uart_putchar(char ch)
+{
+    // implement function to send character via UART
+}
+
+static hdlc_t hdlc;
+
+// Static buffer allocations
+static uint8_t  _hdlc_rx_frame[HDLC_MRU];   // rx frame buffer allocation
+static uint8_t  _hdlc_tx_frame[HDLC_MRU];   // tx frame buffer allocation
+static uint8_t  _hdlc_payload[HDLC_MRU];    // payload buffer allocation
+
+
+
+/** Приватная функция для отправки байтов по uart */
+static void hdlc_tx_byte(uint8_t byte)
+{
+    uart_putchar((char)byte);
+}
+
+/*  инициализация конечного автомата HDLC, указателей буфера и переменных состояния */
+void hdlc_init(void)
+{
+    hdlc.rx_frame_index         = 0;
+    hdlc.rx_frame_fcs           = HDLC_CRC_INIT_VAL;
+    hdlc.p_rx_frame 	        = _hdlc_rx_frame;
+    memset(hdlc.p_rx_frame, 0, HDLC_MRU);
+    hdlc.p_tx_frame 	        = _hdlc_tx_frame;
+    memset(hdlc.p_tx_frame, 0, HDLC_MRU);
+    hdlc.p_payload 	            = _hdlc_payload;
+    memset(hdlc.p_payload, 0, HDLC_MRU);
+    hdlc.state					= HDLC_SOF_WAIT;
+    hdlc.own_addr				= SETUP_OWNADDRESS;
+}
+
+//Эта функция должна вызываться при получении нового символа через UART
+static void hdlc_esc_tx_byte(uint8_t byte)
+{
+    if((byte == HDLC_CONTROL_ESCAPE) || (byte == HDLC_FLAG_SOF))
+    {
+        hdlc_tx_byte(HDLC_CONTROL_ESCAPE);
+        byte ^= HDLC_ESCAPE_BIT;
+        hdlc_tx_byte(byte);
+    }
+    else
+        hdlc_tx_byte(byte);
+}
+
+void hdlc_process_rx_frame(uint8_t *buf, uint16_t len){
+    return;
+}
+
+void hdlc_tx_frame(const uint8_t *txbuffer, uint8_t len){
+    return;
+}

hdlc/hdlc.h

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+#ifndef DISPLAY_AVR_3_HDLC_H
+#define DISPLAY_AVR_3_HDLC_H
+
+#define HDLC_MRU    256
+// HDLC constants --- RFC 1662
+#define HDLC_FLAG_SOF				  0x7e   // Flag
+#define HDLC_CONTROL_ESCAPE 	0x7d   // Control Escape octet
+#define HDLC_ESCAPE_BIT     	0x20   // Transparency modifier octet (XOR bit)
+#define HDLC_CRC_INIT_VAL   	0xffff
+#define HDLC_CRC_MAGIC_VAL   	0xf0b8
+#define HDLC_CRC_POLYNOMIAL  	0x8408
+#define HDLC_UI_CMD						0x03     // Unnumbered Information with payload
+#define HDLC_FINAL_FLAG       0x10     // F flag
+#define HDLC_POLL_FLAG       0x10      // P flag
+
+typedef enum
+{
+    HDLC_SOF_WAIT,
+    HDLC_DATARX,
+    HDLC_PROC_ESC,
+} hdlc_state_t;
+
+typedef struct
+{
+    uint8_t				own_addr;
+    uint8_t				src_addr;
+    uint8_t  			dest_addr;
+    uint8_t 			ctrl;
+    uint8_t				*p_tx_frame;			// tx frame buffer
+    uint8_t 			*p_rx_frame;			// rx frame buffer
+    uint8_t				*p_payload;				// payload pointer
+    uint16_t   		rx_frame_index;
+    uint16_t			rx_frame_fcs;
+    hdlc_state_t	state;
+} hdlc_t;
+
+
+void hdlc_init(void);
+
+void hdlc_process_rx_frame(uint8_t *buf, uint16_t len);
+void hdlc_tx_frame(const uint8_t *txbuffer, uint8_t len);
+
+#endif //DISPLAY_AVR_3_HDLC_H