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- /*
-
- u8g_com_arduino_hw_usart_spi.c
- Universal 8bit Graphics Library
-
- Copyright (c) 2011, olikraus@gmail.com
- All rights reserved.
- Redistribution and use in source and binary forms, with or without modification,
- are permitted provided that the following conditions are met:
- * Redistributions of source code must retain the above copyright notice, this list
- of conditions and the following disclaimer.
-
- * Redistributions in binary form must reproduce the above copyright notice, this
- list of conditions and the following disclaimer in the documentation and/or other
- materials provided with the distribution.
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- SPI Clock Cycle Type
-
- SSD1351 50ns 20 MHz
- SSD1322 300ns 3.3 MHz
- SSD1327 300ns
- SSD1306 300ns
- ST7565 400ns 2.5 MHz
- ST7920 400ns
- */
- #include "u8g.h"
- #if defined(ARDUINO)
- #if defined(__AVR_ATmega32U4__ )
- #include <avr/interrupt.h>
- #include <avr/io.h>
- #if ARDUINO < 100
- #include <WProgram.h>
- #else
- #include <Arduino.h>
- #endif
- static uint8_t u8g_usart_spi_out(uint8_t data)
- {
- /* send data */
- UDR1 = data;
- /* wait for empty transmit buffer */
- while(!(UCSR1A & (1 << UDRE1)));
- return UDR1;
- }
- uint8_t u8g_com_arduino_hw_usart_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
- {
- switch(msg)
- {
- case U8G_COM_MSG_STOP:
- break;
-
- case U8G_COM_MSG_INIT:
- /* SCK is already an output as we overwrite TXLED */
- u8g_com_arduino_assign_pin_output_high(u8g);
- u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
-
- // Init interface at 2MHz
- UBRR1 = 0x00;
- UCSR1C = (1 << UMSEL11) | (1 << UMSEL10);
- UCSR1B = (1 << TXEN1);
- UBRR1 = 3;
-
- break;
-
- case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
- u8g_com_arduino_digital_write(u8g, U8G_PI_A0, arg_val);
- break;
- case U8G_COM_MSG_CHIP_SELECT:
- if ( arg_val == 0 )
- {
- /* disable */
- u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
- }
- else
- {
- /* enable */
- u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
- }
- break;
-
- case U8G_COM_MSG_RESET:
- if ( u8g->pin_list[U8G_PI_RESET] != U8G_PIN_NONE )
- u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val);
- break;
-
- case U8G_COM_MSG_WRITE_BYTE:
- u8g_usart_spi_out(arg_val);
- break;
-
- case U8G_COM_MSG_WRITE_SEQ:
- {
- register uint8_t *ptr = arg_ptr;
- while( arg_val > 0 )
- {
- u8g_usart_spi_out(*ptr++);
- arg_val--;
- }
- }
- break;
- case U8G_COM_MSG_WRITE_SEQ_P:
- {
- register uint8_t *ptr = arg_ptr;
- while( arg_val > 0 )
- {
- u8g_usart_spi_out(u8g_pgm_read(ptr));
- ptr++;
- arg_val--;
- }
- }
- break;
- }
- return 1;
- }
- /* #elif defined(__18CXX) || defined(__PIC32MX) */
- /* #elif defined(__arm__) // Arduino Due, maybe we should better check for __SAM3X8E__ */
- #else /* __AVR_ATmega32U4__ */
- #endif /* __AVR_ATmega32U4__ */
- #else /* ARDUINO */
- uint8_t u8g_com_arduino_hw_usart_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
- {
- return 1;
- }
- #endif /* ARDUINO */
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