6f4873329e
In Travis we already test against 1.17.
160 lines
No EOL
4.6 KiB
C
160 lines
No EOL
4.6 KiB
C
/*
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u8g_arduino_ATtiny85_std_hw_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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*/
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// Uses code from tinySPI Written by Nick Gammon
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// March 2013
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// ATMEL ATTINY45 / ARDUINO pin mappings
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//
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// +-\/-+
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// RESET Ain0 (D 5) PB5 1| |8 Vcc
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// CLK1 Ain3 (D 3) PB3 2| |7 PB2 (D 2) Ain1 SCK / USCK / SCL
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// CLK0 Ain2 (D 4) PB4 3| |6 PB1 (D 1) pwm1 MISO / DO
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// GND 4| |5 PB0 (D 0) pwm0 MOSI / DI / SDA
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// +----+
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#include "u8g.h"
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#if defined(ARDUINO) && defined(__AVR_ATtiny85__)
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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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const byte DI = 0; // D0, pin 5 Data In
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const byte DO = 1; // D1, pin 6 Data Out (this is *not* MOSI)
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const byte USCK = 2; // D2, pin 7 Universal Serial Interface clock
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uint8_t u8g_arduino_ATtiny85_spi_out(uint8_t val)
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{
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USIDR = val; // byte to output
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USISR = _BV (USIOIF); // clear Counter Overflow Interrupt Flag, set count to zero
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do
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{
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USICR = _BV (USIWM0) // 3-wire mode
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| _BV (USICS1) | _BV (USICLK) // Software clock strobe
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| _BV (USITC); // Toggle Clock Port Pin
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}
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while ((USISR & _BV (USIOIF)) == 0); // until Counter Overflow Interrupt Flag set
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return USIDR; // return read data
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}
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uint8_t u8g_com_arduino_ATtiny85_std_hw_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_INIT:
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u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH); // ensure SS stays high until needed
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pinMode (USCK, OUTPUT);
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pinMode (DO, OUTPUT);
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pinMode (u8g->pin_list[U8G_PI_CS], OUTPUT);
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pinMode (u8g->pin_list[U8G_PI_A0], OUTPUT);
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USICR = _BV (USIWM0); // 3-wire mode
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u8g_MicroDelay();
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break;
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case U8G_COM_MSG_STOP:
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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_CHIP_SELECT:
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if ( arg_val == 0 )
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{
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/* disable */
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u8g_MicroDelay();
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u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
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u8g_MicroDelay();
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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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u8g_MicroDelay();
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}
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break;
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case U8G_COM_MSG_WRITE_BYTE:
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u8g_arduino_ATtiny85_spi_out(arg_val);
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u8g_MicroDelay();
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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_arduino_ATtiny85_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_arduino_ATtiny85_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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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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u8g_MicroDelay();
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break;
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}
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return 1;
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}
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#else /* ARDUINO */
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uint8_t u8g_com_arduino_ATtiny85_std_hw_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 */ |