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160 lines
4.0 KiB
160 lines
4.0 KiB
/*
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u8g_com_arduino_hw_usart_spi.c
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Universal 8bit Graphics Library
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Copyright (c) 2011, 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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SPI Clock Cycle Type
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SSD1351 50ns 20 MHz
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SSD1322 300ns 3.3 MHz
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SSD1327 300ns
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SSD1306 300ns
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ST7565 400ns 2.5 MHz
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ST7920 400ns
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*/
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#include "u8g.h"
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#if defined(ARDUINO)
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#if defined(__AVR_ATmega32U4__ )
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#if ARDUINO < 100
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#include <WProgram.h>
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#else
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#include <Arduino.h>
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#endif
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static uint8_t u8g_usart_spi_out(uint8_t data)
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{
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/* send data */
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UDR1 = data;
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/* wait for empty transmit buffer */
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while(!(UCSR1A & (1 << UDRE1)));
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return UDR1;
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}
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uint8_t u8g_com_arduino_hw_usart_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
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{
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switch(msg)
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{
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case U8G_COM_MSG_STOP:
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break;
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case U8G_COM_MSG_INIT:
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/* SCK is already an output as we overwrite TXLED */
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u8g_com_arduino_assign_pin_output_high(u8g);
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u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
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// Init interface at 2MHz
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UBRR1 = 0x00;
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UCSR1C = (1 << UMSEL11) | (1 << UMSEL10);
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UCSR1B = (1 << TXEN1);
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UBRR1 = 3;
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break;
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case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
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u8g_com_arduino_digital_write(u8g, U8G_PI_A0, arg_val);
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break;
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case U8G_COM_MSG_CHIP_SELECT:
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if ( arg_val == 0 )
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{
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/* disable */
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u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
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}
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else
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{
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/* enable */
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u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
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}
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break;
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case U8G_COM_MSG_RESET:
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if ( u8g->pin_list[U8G_PI_RESET] != U8G_PIN_NONE )
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u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val);
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break;
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case U8G_COM_MSG_WRITE_BYTE:
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u8g_usart_spi_out(arg_val);
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break;
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case U8G_COM_MSG_WRITE_SEQ:
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{
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register uint8_t *ptr = arg_ptr;
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while( arg_val > 0 )
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{
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u8g_usart_spi_out(*ptr++);
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arg_val--;
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}
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}
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break;
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case U8G_COM_MSG_WRITE_SEQ_P:
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{
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register uint8_t *ptr = arg_ptr;
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while( arg_val > 0 )
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{
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u8g_usart_spi_out(u8g_pgm_read(ptr));
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ptr++;
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arg_val--;
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}
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}
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break;
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}
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return 1;
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}
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/* #elif defined(__18CXX) || defined(__PIC32MX) */
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/* #elif defined(__arm__) // Arduino Due, maybe we should better check for __SAM3X8E__ */
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#else /* __AVR_ATmega32U4__ */
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#endif /* __AVR_ATmega32U4__ */
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#else /* ARDUINO */
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uint8_t u8g_com_arduino_hw_usart_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
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{
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return 1;
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}
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#endif /* ARDUINO */
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