add img2code

examples/badapple/.gitignore

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+build
+Drivers
+startup*.s
+*.svd
+*.ld

examples/badapple/Makefile

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+# Tools
+CC=arm-none-eabi-gcc
+LD=arm-none-eabi-gcc
+
+# Code Paths
+BUILD_DIR = build
+SSD1306_DIR = ../../ssd1306
+LDSCRIPT = STM32F411CEUx_FLASH.ld
+STARTUP = startup_stm32f411xe.s
+
+# SSD1306 flags
+SSD1306_MCU = STM32F4
+SSD1306_I2C = hi2c1
+SSD1306_SPI = hspi1
+SSD1306_FLAGS= -D${SSD1306_MCU}
+SSD1306_FLAGS+= -DSSD1306_I2C_PORT=${SSD1306_I2C}
+SSD1306_FLAGS+= -DSSD1306_SPI_PORT=${SSD1306_SPI}
+
+# Sources
+SRCS =  \
+${STARTUP} \
+src/main.c \
+src/badapple.c \
+src/system_stm32f4xx.c \
+${SSD1306_DIR}/ssd1306.c
+SRCS+=$(wildcard Drivers/STM32F4xx_HAL_Driver/Src/*.c)
+
+# Objects
+OBJS=$(patsubst %.c,%.o,$(patsubst %.s,%.o,$(SRCS)))
+OBJECTS=$(addprefix $(BUILD_DIR)/,$(notdir $(OBJS)))
+vpath %.c $(sort $(dir $(SRCS)))
+
+# CPU
+CPU = -mcpu=cortex-m4
+FPU = 
+FLOAT-ABI = 
+MCU = $(CPU) -mthumb $(FPU) $(FLOAT-ABI)
+
+# CMSIS
+DEVICE = Drivers/CMSIS/Device/ST/STM32F4xx/Include
+CORE = Drivers/CMSIS/Include
+
+# HAL
+HAL = Drivers/STM32F4xx_HAL_Driver/Inc
+
+# Compilation Flags
+LDFLAGS= -T${LDSCRIPT} ${MCU} --specs=nosys.specs -flto -Wl,--gc-sections -Wl,--print-memory-usage
+CFLAGS= ${MCU} --specs=nosys.specs -fdata-sections -ffunction-sections -Og -g -gdwarf-2
+CFLAGS+= -I$(DEVICE) -I$(CORE) -I${HAL} -I$(SSD1306_DIR) -Ibuild -Isrc
+CFLAGS+= -DUSE_HAL_DRIVER -DSTM32F411xE
+CFLAGS+= $(SSD1306_FLAGS)
+
+# Build executable 
+
+.PHONY: i2c
+i2c: CFLAGS+= -DSSD1306_USE_I2C
+i2c: $(BUILD_DIR)/i2c.elf
+
+.PHONY: spi
+spi: CFLAGS+= -DSSD1306_USE_SPI
+spi: $(BUILD_DIR)/spi.elf
+
+$(BUILD_DIR)/ssd1306_conf.h: $(BUILD_DIR)
+	touch $(BUILD_DIR)/ssd1306_conf.h
+
+$(BUILD_DIR)/%.o: %.c Makefile | $(BUILD_DIR)
+	$(CC) -c $(CFLAGS) $< -o $@
+
+$(BUILD_DIR)/%.o: %.s Makefile | $(BUILD_DIR)
+	$(CC) -c $(CFLAGS) $< -o $@
+
+$(BUILD_DIR)/%.elf: $(BUILD_DIR)/ssd1306_conf.h $(OBJECTS) Makefile
+	$(CC) $(OBJECTS) $(LDFLAGS) -o $@
+
+$(BUILD_DIR):
+	mkdir $@
+

examples/badapple/README.md

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+# Bad Apple!! Demo
+
+Touhou - Bad Apple!! ~3FPS animation demo.
+
+Tested with BlackPill STM32F411CEU6 and CH1115 128X64.
+
+## Requirements
+
+- MCU with at least 512 KB Flash memory
+- 128x64 OLED display
+- ARM GNU Toolchain
+- make
+- STM32F4 HAL
+- Linker script and startup assembler
+
+## Build
+
+Feel free to edit `Makefile` for your configuration
+(I2C/SPI port, resolution, etc.).
+
+**I2C:**
+
+```bash
+make i2c
+```
+
+**SPI:**
+
+```bash
+make spi
+```
+
+## Disclaimer
+
+The rights to the graphic materials used belong to
+[Alstroemeria Records](https://youtu.be/i41KoE0iMYU?si=yKNadXjtwOtBxE6J).

examples/badapple/src/main.c

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+#include "ssd1306.h"
+#include "stm32f4xx_hal.h"
+
+extern const SSD1306_animation_t badapple;
+
+#ifdef SSD1306_USE_I2C
+
+I2C_HandleTypeDef SSD1306_I2C_PORT;
+
+static void I2C_Init(void) {
+  SSD1306_I2C_PORT.Instance = I2C1;
+  SSD1306_I2C_PORT.Init.ClockSpeed = 400000;
+  SSD1306_I2C_PORT.Init.DutyCycle = I2C_DUTYCYCLE_2;
+  SSD1306_I2C_PORT.Init.OwnAddress1 = 0;
+  SSD1306_I2C_PORT.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
+  SSD1306_I2C_PORT.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
+  SSD1306_I2C_PORT.Init.OwnAddress2 = 0;
+  SSD1306_I2C_PORT.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
+  SSD1306_I2C_PORT.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
+  HAL_I2C_Init(&SSD1306_I2C_PORT);
+}
+
+void HAL_I2C_MspInit(I2C_HandleTypeDef *hi2c) {
+  GPIO_InitTypeDef GPIO_InitStruct;
+  if (hi2c->Instance == I2C1) {
+    /* Peripheral clock enable */
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    __HAL_RCC_I2C1_CLK_ENABLE();
+
+    /**I2C1 GPIO Configuration
+    PB8     ------> I2C1_SCL
+    PB9     ------> I2C1_SDA
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_8 | GPIO_PIN_9;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
+    GPIO_InitStruct.Pull = GPIO_PULLUP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
+    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+  }
+}
+
+#elif defined(SSD1306_USE_SPI)
+
+SPI_HandleTypeDef SSD1306_SPI_PORT;
+
+static void SPI_Init(void) {
+  /* SPI1 parameter configuration*/
+  SSD1306_SPI_PORT.Instance = SPI1;
+  SSD1306_SPI_PORT.Init.Mode = SPI_MODE_MASTER;
+  SSD1306_SPI_PORT.Init.Direction = SPI_DIRECTION_2LINES;
+  SSD1306_SPI_PORT.Init.DataSize = SPI_DATASIZE_8BIT;
+  SSD1306_SPI_PORT.Init.CLKPolarity = SPI_POLARITY_LOW;
+  SSD1306_SPI_PORT.Init.CLKPhase = SPI_PHASE_1EDGE;
+  SSD1306_SPI_PORT.Init.NSS = SPI_NSS_SOFT;
+  SSD1306_SPI_PORT.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;
+  SSD1306_SPI_PORT.Init.FirstBit = SPI_FIRSTBIT_MSB;
+  SSD1306_SPI_PORT.Init.TIMode = SPI_TIMODE_DISABLE;
+  SSD1306_SPI_PORT.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
+  SSD1306_SPI_PORT.Init.CRCPolynomial = 10;
+  HAL_SPI_Init(&SSD1306_SPI_PORT);
+}
+
+void HAL_SPI_MspInit(SPI_HandleTypeDef* hspi) {
+  GPIO_InitTypeDef GPIO_InitStruct;
+
+  __HAL_RCC_GPIOA_CLK_ENABLE();
+  __HAL_RCC_GPIOB_CLK_ENABLE();
+
+  HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_RESET);
+  HAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_RESET);
+  HAL_GPIO_WritePin(SSD1306_Reset_Port, SSD1306_Reset_Pin, GPIO_PIN_RESET);
+
+  /*Configure GPIO pin : SSD1306_CS_Pin */
+  GPIO_InitStruct.Pin = SSD1306_CS_Pin;
+  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
+  GPIO_InitStruct.Pull = GPIO_NOPULL;
+  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
+  HAL_GPIO_Init(SSD1306_CS_Port, &GPIO_InitStruct);
+
+  /*Configure GPIO pin : SSD1306_DC_Pin */
+  GPIO_InitStruct.Pin = SSD1306_DC_Pin;
+  HAL_GPIO_Init(SSD1306_DC_Port, &GPIO_InitStruct);
+
+  /*Configure GPIO pin : SSD1306_Reset_Pin */
+  GPIO_InitStruct.Pin = SSD1306_Reset_Pin;
+  HAL_GPIO_Init(SSD1306_Reset_Port, &GPIO_InitStruct);
+
+  if (hspi->Instance == SPI1) {
+    /* Peripheral clock enable */
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    __HAL_RCC_SPI1_CLK_ENABLE();
+
+    /**SPI1 GPIO Configuration
+    PA5     ------> SPI1_SCK
+    PA7     ------> SPI1_MOSI
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_5 | GPIO_PIN_7;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+  }
+}
+#endif  // SSD1306_USE_I2C
+
+int main(void) {
+  HAL_Init();
+
+  /* Initialize peripherals */
+#ifdef SSD1306_USE_I2C
+  I2C_Init();
+#elif defined(SSD1306_USE_SPI)
+  SPI_Init();
+#endif  // SSD1306_USE_I2C
+  ssd1306_Init();
+  uint32_t tick;
+  const uint32_t frametime = 306;
+  while (1) {
+    tick = HAL_GetTick();
+    for (uint32_t i = 0; i < badapple.frames; i++) {
+      tick += frametime;
+      ssd1306_Fill(Black);
+      ssd1306_DrawBitmap(21, 0, badapple.frame[i], badapple.w, badapple.h,
+                         White);
+      ssd1306_UpdateScreen();
+      while (HAL_GetTick() < tick) {
+      }
+    }
+  }
+}
+
+void SysTick_Handler(void) {
+  HAL_IncTick();
+  HAL_SYSTICK_IRQHandler();
+}