first commit

basic-setup/components/u8g2/sys/avr/avr-libc/atmega328p/Makefile

@@ -0,0 +1,46 @@
+CC = avr-gcc
+OBJCPY = avr-objcopy
+SIZE = avr-size
+MCU = atmega328p
+F_CPU = 16000000
+U8G2_SRC = ../../../../csrc
+CFLAGS = \
+	-mmcu=$(MCU) \
+	-DF_CPU=$(F_CPU)UL \
+	-Os \
+	-std=gnu99 \
+	-Werror \
+	-ffunction-sections \
+	-fdata-sections \
+	-I$(U8G2_SRC)/ \
+	-I../lib/ \
+	-DAVR_USE_HW_SPI \
+	-DSCK_DDR=DDRB \
+	-DSCK_BIT=5 \
+	-DMOSI_DDR=DDRB \
+	-DMOSI_BIT=3
+LDFLAGS = \
+	-Wl,--gc-sections \
+	-mmcu=$(MCU)
+AVRDUDE=avrdude
+PORT=/dev/serial/by-id/usb-FTDI_FT232R_USB_UART_A4008fhY-if00-port0
+
+SRC = $(shell ls $(U8G2_SRC)/*.c) $(shell ls ../lib/*.c) $(shell ls ./*.c)
+
+OBJ = $(SRC:.c=.o)
+
+main.hex: main.elf
+	$(OBJCPY) -O ihex -R .eeprom -R .fuse -R .lock -R .signature main.elf main.hex
+
+main.elf: $(OBJ)
+	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ) -o $@
+
+size: main.elf
+	$(SIZE) --mcu=$(MCU) --format=avr main.elf
+
+clean:
+	rm -f $(OBJ) main.elf main.hex
+
+# Example for Arduino Duemilanove
+upload: main.hex
+	$(AVRDUDE) -p$(MCU) -carduino -P$(PORT) -b57600 -D -Uflash:w:main.hex:i

basic-setup/components/u8g2/sys/avr/avr-libc/atmega328p/main.c

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+#include <u8g2.h>
+#include <util/delay.h>
+#include <u8x8_avr.h>
+#include <avr/power.h>
+
+#define CS_DDR DDRB
+#define CS_PORT PORTB
+#define CS_BIT 2
+
+#define DC_DDR DDRB
+#define DC_PORT PORTB
+#define DC_BIT 1
+
+#define RESET_DDR DDRB
+#define RESET_PORT PORTB
+#define RESET_BIT 0
+
+
+u8g2_t u8g2;
+
+uint8_t
+u8x8_gpio_and_delay (u8x8_t * u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) {
+  // Re-use library for delays
+  if (u8x8_avr_delay(u8x8, msg, arg_int, arg_ptr))
+    return 1;
+
+  switch (msg) {
+    // called once during init phase of u8g2/u8x8
+    // can be used to setup pins
+    case U8X8_MSG_GPIO_AND_DELAY_INIT:
+      CS_DDR |= _BV(CS_BIT);
+      DC_DDR |= _BV(DC_BIT);
+      RESET_DDR |= _BV(RESET_BIT);
+      break;
+    // CS (chip select) pin: Output level in arg_int
+    case U8X8_MSG_GPIO_CS:
+      if (arg_int)
+        CS_PORT |= _BV(CS_BIT);
+      else
+        CS_PORT &= ~_BV(CS_BIT);
+      break;
+    // DC (data/cmd, A0, register select) pin: Output level in arg_int
+    case U8X8_MSG_GPIO_DC:
+      if (arg_int)
+        DC_PORT |= _BV(DC_BIT);
+      else
+        DC_PORT &= ~_BV(DC_BIT);
+      break;
+    // Reset pin: Output level in arg_int
+    case U8X8_MSG_GPIO_RESET:
+      if (arg_int)
+        RESET_PORT |= _BV(RESET_BIT);
+      else
+        RESET_PORT &= ~_BV(RESET_BIT);
+      break;
+    default:
+      u8x8_SetGPIOResult(u8x8, 1);
+      break;
+  }
+  return 1;
+}
+
+int main (void) {
+  u8g2_Setup_sh1106_128x64_noname_f(
+    &u8g2, U8G2_R0,
+    u8x8_byte_avr_hw_spi,
+    u8x8_gpio_and_delay
+  );
+  u8g2_InitDisplay(&u8g2);
+  u8g2_SetPowerSave(&u8g2, 0);
+
+  while (1) {
+    u8g2_ClearBuffer(&u8g2);
+    u8g2_SetFont(&u8g2, u8g2_font_ncenB14_tr);
+    u8g2_DrawStr(&u8g2, 0, 15, "Hello!");
+    u8g2_SendBuffer(&u8g2);
+  }
+}