79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
#include <u8g2.h>
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#include <util/delay.h>
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#include <u8x8_avr.h>
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#include <avr/power.h>
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#define CS_DDR DDRB
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#define CS_PORT PORTB
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#define CS_BIT 0
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#define DC_DDR DDRB
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#define DC_PORT PORTB
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#define DC_BIT 4
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#define RESET_DDR DDRA
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#define RESET_PORT PORTA
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#define RESET_BIT 7
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u8g2_t u8g2;
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uint8_t
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u8x8_gpio_and_delay (u8x8_t * u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) {
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// Re-use library for delays
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if (u8x8_avr_delay(u8x8, msg, arg_int, arg_ptr))
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return 1;
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switch (msg) {
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// called once during init phase of u8g2/u8x8
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// can be used to setup pins
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case U8X8_MSG_GPIO_AND_DELAY_INIT:
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CS_DDR |= _BV(CS_BIT);
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DC_DDR |= _BV(DC_BIT);
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RESET_DDR |= _BV(RESET_BIT);
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break;
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// CS (chip select) pin: Output level in arg_int
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case U8X8_MSG_GPIO_CS:
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if (arg_int)
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CS_PORT |= _BV(CS_BIT);
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else
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CS_PORT &= ~_BV(CS_BIT);
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break;
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// DC (data/cmd, A0, register select) pin: Output level in arg_int
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case U8X8_MSG_GPIO_DC:
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if (arg_int)
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DC_PORT |= _BV(DC_BIT);
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else
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DC_PORT &= ~_BV(DC_BIT);
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break;
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// Reset pin: Output level in arg_int
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case U8X8_MSG_GPIO_RESET:
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if (arg_int)
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RESET_PORT |= _BV(RESET_BIT);
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else
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RESET_PORT &= ~_BV(RESET_BIT);
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break;
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default:
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u8x8_SetGPIOResult(u8x8, 1);
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break;
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}
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return 1;
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}
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int main (void) {
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u8g2_Setup_sh1106_128x64_vcomh0_f(
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&u8g2, U8G2_R0,
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u8x8_byte_avr_hw_spi,
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u8x8_gpio_and_delay
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);
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u8g2_InitDisplay(&u8g2);
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u8g2_SetPowerSave(&u8g2, 0);
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while (1) {
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u8g2_ClearBuffer(&u8g2);
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u8g2_SetFont(&u8g2, u8g2_font_ncenB14_tr);
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u8g2_DrawStr(&u8g2, 0, 15, "Hello!");
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u8g2_SendBuffer(&u8g2);
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}
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}
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