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- /*
-
- u8g_arduino_ATtiny85_std_hw_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.
-
- */
- // Uses code from tinySPI Written by Nick Gammon
- // March 2013
- // ATMEL ATTINY45 / ARDUINO pin mappings
- //
- // +-\/-+
- // RESET Ain0 (D 5) PB5 1| |8 Vcc
- // CLK1 Ain3 (D 3) PB3 2| |7 PB2 (D 2) Ain1 SCK / USCK / SCL
- // CLK0 Ain2 (D 4) PB4 3| |6 PB1 (D 1) pwm1 MISO / DO
- // GND 4| |5 PB0 (D 0) pwm0 MOSI / DI / SDA
- // +----+
- #include "u8g.h"
- #if defined(ARDUINO) && defined(__AVR_ATtiny85__)
- #if ARDUINO < 100
- #include <WProgram.h>
- #else
- #include <Arduino.h>
- #endif
- const byte DI = 0; // D0, pin 5 Data In
- const byte DO = 1; // D1, pin 6 Data Out (this is *not* MOSI)
- const byte USCK = 2; // D2, pin 7 Universal Serial Interface clock
- uint8_t u8g_arduino_ATtiny85_spi_out(uint8_t val)
- {
- USIDR = val; // byte to output
- USISR = _BV (USIOIF); // clear Counter Overflow Interrupt Flag, set count to zero
- do
- {
- USICR = _BV (USIWM0) // 3-wire mode
- | _BV (USICS1) | _BV (USICLK) // Software clock strobe
- | _BV (USITC); // Toggle Clock Port Pin
- }
- while ((USISR & _BV (USIOIF)) == 0); // until Counter Overflow Interrupt Flag set
-
- return USIDR; // return read data
- }
- uint8_t u8g_com_arduino_ATtiny85_std_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
- {
- switch(msg)
- {
- case U8G_COM_MSG_INIT:
- u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH); // ensure SS stays high until needed
- pinMode (USCK, OUTPUT);
- pinMode (DO, OUTPUT);
- pinMode (u8g->pin_list[U8G_PI_CS], OUTPUT);
- pinMode (u8g->pin_list[U8G_PI_A0], OUTPUT);
- USICR = _BV (USIWM0); // 3-wire mode
- u8g_MicroDelay();
- break;
-
- case U8G_COM_MSG_STOP:
- 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_CHIP_SELECT:
- if ( arg_val == 0 )
- {
- /* disable */
- u8g_MicroDelay();
- u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
- u8g_MicroDelay();
- }
- else
- {
- /* enable */
- u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
- u8g_MicroDelay();
- }
- break;
- case U8G_COM_MSG_WRITE_BYTE:
- u8g_arduino_ATtiny85_spi_out(arg_val);
- u8g_MicroDelay();
- break;
-
- case U8G_COM_MSG_WRITE_SEQ:
- {
- register uint8_t *ptr = arg_ptr;
- while( arg_val > 0 )
- {
- u8g_arduino_ATtiny85_spi_out(*ptr++);
- arg_val--;
- }
- }
- break;
- case U8G_COM_MSG_WRITE_SEQ_P:
- {
- register uint8_t *ptr = arg_ptr;
- while( arg_val > 0 )
- {
- u8g_arduino_ATtiny85_spi_out(u8g_pgm_read(ptr));
- ptr++;
- arg_val--;
- }
- }
- 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);
- u8g_MicroDelay();
- break;
- }
- return 1;
- }
- #else /* ARDUINO */
- uint8_t u8g_com_arduino_ATtiny85_std_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
- {
- return 1;
- }
- #endif /* ARDUINO */
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