reconstruct main.c
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kraus
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/*
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main.c
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AVR Test Project
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This project will use 4-Wire SW SPI
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Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
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Copyright (c) 2018, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <avr/io.h>
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#include <u8g2.h>
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#include <util/delay.h>
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#define DISPLAY_CLK_DIR DDRB
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#define DISPLAY_CLK_PORT PORTB
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#define DISPLAY_CLK_PIN 5
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#define DISPLAY_DATA_DIR DDRB
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#define DISPLAY_DATA_PORT PORTB
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#define DISPLAY_DATA_PIN 3
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#define DISPLAY_CS_DIR DDRB
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#define DISPLAY_CS_PORT PORTB
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#define DISPLAY_CS_PIN 2
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#define DISPLAY_DC_DIR DDRB
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#define DISPLAY_DC_PORT PORTB
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#define DISPLAY_DC_PIN 1
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#define DISPLAY_RESET_DIR DDRB
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#define DISPLAY_RESET_PORT PORTB
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#define DISPLAY_RESET_PIN 0
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#define P_CPU_NS (1000000000UL / F_CPU)
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u8g2_t u8g2;
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uint8_t u8x8_avr_delay(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
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{
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uint8_t cycles;
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switch(msg)
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{
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case U8X8_MSG_DELAY_NANO: // delay arg_int * 1 nano second
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// At 20Mhz, each cycle is 50ns, the call itself is slower.
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break;
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case U8X8_MSG_DELAY_100NANO: // delay arg_int * 100 nano seconds
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// Approximate best case values...
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#define CALL_CYCLES 26UL
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#define CALC_CYCLES 4UL
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#define RETURN_CYCLES 4UL
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#define CYCLES_PER_LOOP 4UL
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cycles = (100UL * arg_int) / (P_CPU_NS * CYCLES_PER_LOOP);
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if(cycles > CALL_CYCLES + RETURN_CYCLES + CALC_CYCLES)
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break;
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__asm__ __volatile__ (
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"1: sbiw %0,1" "\n\t" // 2 cycles
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"brne 1b" : "=w" (cycles) : "0" (cycles) // 2 cycles
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);
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break;
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case U8X8_MSG_DELAY_10MICRO: // delay arg_int * 10 micro seconds
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for(int i=0 ; i < arg_int ; i++)
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_delay_us(10);
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break;
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case U8X8_MSG_DELAY_MILLI: // delay arg_int * 1 milli second
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for(int i=0 ; i < arg_int ; i++)
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_delay_ms(1);
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break;
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default:
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return 0;
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}
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return 1;
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}
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uint8_t u8x8_avr_gpio_and_delay(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
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{
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// Re-use library for delays
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switch(msg)
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{
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case U8X8_MSG_GPIO_AND_DELAY_INIT: // called once during init phase of u8g2/u8x8
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DISPLAY_CLK_DIR |= 1<<DISPLAY_CLK_PIN;
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DISPLAY_DATA_DIR |= 1<<DISPLAY_DATA_PIN;
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DISPLAY_CS_DIR |= 1<<DISPLAY_CS_PIN;
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DISPLAY_DC_DIR |= 1<<DISPLAY_DC_PIN;
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DISPLAY_RESET_DIR |= 1<<DISPLAY_RESET_PIN;
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break; // can be used to setup pins
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case U8X8_MSG_GPIO_SPI_CLOCK: // Clock pin: Output level in arg_int
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if(arg_int)
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DISPLAY_CLK_PORT |= (1<<DISPLAY_CLK_PIN);
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else
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DISPLAY_CLK_PORT &= ~(1<<DISPLAY_CLK_PIN);
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break;
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case U8X8_MSG_GPIO_SPI_DATA: // MOSI pin: Output level in arg_int
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if(arg_int)
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DISPLAY_DATA_PORT |= (1<<DISPLAY_DATA_PIN);
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else
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DISPLAY_DATA_PORT &= ~(1<<DISPLAY_DATA_PIN);
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break;
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case U8X8_MSG_GPIO_CS: // CS (chip select) pin: Output level in arg_int
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if(arg_int)
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DISPLAY_CS_PORT |= (1<<DISPLAY_CS_PIN);
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else
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DISPLAY_CS_PORT &= ~(1<<DISPLAY_CS_PIN);
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break;
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case U8X8_MSG_GPIO_DC: // DC (data/cmd, A0, register select) pin: Output level in arg_int
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if(arg_int)
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DISPLAY_DC_PORT |= (1<<DISPLAY_DC_PIN);
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else
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DISPLAY_DC_PORT &= ~(1<<DISPLAY_DC_PIN);
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break;
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case U8X8_MSG_GPIO_RESET: // Reset pin: Output level in arg_int
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if(arg_int)
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DISPLAY_RESET_PORT |= (1<<DISPLAY_RESET_PIN);
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else
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DISPLAY_RESET_PORT &= ~(1<<DISPLAY_RESET_PIN);
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break;
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default:
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if (u8x8_avr_delay(u8x8, msg, arg_int, arg_ptr)) // check for any delay msgs
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return 1;
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u8x8_SetGPIOResult(u8x8, 1); // default return value
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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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{
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/*
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Select a setup procedure for your display from here: https://github.com/olikraus/u8g2/wiki/u8g2setupc
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1. Arg: Address of an empty u8g2 structure
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2. Arg: Usually U8G2_R0, others are listed here: https://github.com/olikraus/u8g2/wiki/u8g2reference#carduino-example
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3. Arg: Protocol procedure (u8g2-byte), list is here: https://github.com/olikraus/u8g2/wiki/Porting-to-new-MCU-platform#communication-callback-eg-u8x8_byte_hw_i2c
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4. Arg: Defined in this code itself (see above)
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*/
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u8g2_Setup_st7565_ea_dogm132_f( &u8g2, U8G2_R0, u8x8_byte_4wire_sw_spi, u8x8_avr_gpio_and_delay );
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u8g2_InitDisplay(&u8g2);
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u8g2_SetPowerSave(&u8g2, 0);
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/* full buffer example, setup procedure ends in _f */
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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, 1, 18, "U8g2 on AVR");
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u8g2_SendBuffer(&u8g2);
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while(1){
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}
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}
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