Innitial commit, blinky

.gitignore

@@ -0,0 +1,2 @@
+./cmake-build-debug
+./.idea

CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.21)
+set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_C_STANDARD 99)
+project(vfdprog C)
+
+set(CMAKE_C_COMPILER avr-gcc)
+set(TARGET_CPU ATmega88)
+
+add_compile_definitions("__AVR_${TARGET_CPU}__")
+include_directories(/usr/lib/avr/include)
+
+add_link_options(-Wl,--print-memory-usage)
+add_executable(${PROJECT_NAME} main.c
+        #PT6302.c PT6302.h
+        )
+
+add_custom_target(
+        FLASH
+        avrdude -p ${TARGET_CPU} -c USBasp -v -U flash:w:${PROJECT_BINARY_DIR}/${PROJECT_NAME}:a
+        DEPENDS ${PROJECT_NAME}
+        COMMENT "Flash to ${TARGET_CPU}"
+)

PT6302.c

@@ -0,0 +1,73 @@
+//
+// Created by lacko on 02/03/2022.
+//
+#include <avr/io.h>
+#include <util/delay.h>
+#include "PT6302.h"
+
+void PT6302_startup (void)
+{
+  PORTB |= (CSBpin | CLKBpin);
+  PORTB &= ~DINpin;
+  PORTC |= RSTpin;
+  DDRB |= (CSBpin | CLKBpin | DINpin);
+  DDRC |= RSTpin;
+  _delay_us (TPRZ);
+  PORTC &= ~RSTpin;
+  _delay_us (TWRSTB);
+};
+
+void transmit_bytes (const uint8_t *payload, const uint8_t size)
+{
+  PORTB &= ~CSBpin;
+  for (int i = 0; i < size; ++i)
+    {
+      uint8_t data = payload[i];
+      for (int j = 0; j < 8; ++j)
+        {
+          PORTB &= ~CLKBpin;
+          if ((data & 0x01) == 0)
+            {
+              PORTB |= DINpin;
+            }
+          else
+            {
+              PORTB &= ~DINpin;
+            }
+          _delay_us (TCW);
+          PORTB |= CLKBpin;
+          _delay_us (TCW);
+          data >> 1;
+        }
+      _delay_us (TDOFF);
+    }
+  _delay_us (DTCSH);
+  PORTB |= CSBpin;
+}
+
+void send_command (const uint8_t command)
+{
+  transmit_bytes (&command, 1);
+}
+
+
+void set_display_brightness (uint8_t level)
+{
+  switch (level)
+    {
+      case 0:send_command (0x0A);
+      break;
+      case 1:send_command (0x2A);
+      break;
+      case 2:send_command (0x4A);
+      break;
+      case 3:send_command (0x6A);
+      break;
+      case 4:send_command (0x8A);
+      break;
+      case 5:send_command (0xAA);
+      break;
+      case 6:send_command (0xCA);
+      default:send_command (0xEA);
+    }
+}

PT6302.h

@@ -0,0 +1,42 @@
+//
+// Created by lacko on 02/03/2022.
+//
+
+#ifndef _PT6302_H_
+#define _PT6302_H_
+
+/* PT6302 timing constants, all in usec */
+#define TCW 1     //CLKB pulse width
+#define TDOFF 8   //Data processing time
+#define DTCSH 16  //time difference between tDOFF and tCSH
+#define TPRZ 100  //VDD rise time
+#define TWRSTB 1  //RSTB pulse width
+
+#define RSTpin (uint8_t) (1 << PC2)
+#define CSBpin (uint8_t) (1 << PB0)
+#define CLKBpin (uint8_t) (1 << PB6)
+#define DINpin (uint8_t) (1 << PB7)
+
+
+/* -------------------------------------------------------------
+ * Innitial setup for the VFD controller interface
+ * Sets up the connected pins and leaves them in inactive state.
+ * ------------------------------------------------------------- */
+void PT6302_startup(void);
+
+
+/* -------------------------------------------------------------------------------
+ * Transmits size byte of data through the VFD controller's interface from payload
+ * Handles CLKB, CSB and timing constraints
+ * ------------------------------------------------------------------------------- */
+void transmit_bytes (const uint8_t* payload, uint8_t size);
+
+
+/* --------------------------------------------------------------
+ * Set the brightness of the VFD
+ * level can be between 0-7, 7 and larger will set max brightness
+ * It sets the display's duty cycle to conroll the brightness
+ * -------------------------------------------------------------- */
+void set_display_brightness (uint8_t level);
+
+#endif //_PT6302_H_

main.c

@@ -0,0 +1,18 @@
+#define F_CPU 8000000UL
+#include <avr/io.h>
+#include <util/delay.h>
+
+
+int main ()
+{
+  uint8_t ledpin = (1 << PC4);
+  DDRC |= ledpin;
+
+  while (1)
+    {
+      PORTC |= ledpin;
+      _delay_ms (1000);
+      PORTC &= ~ledpin;
+      _delay_ms (1000);
+    }
+}