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王立帮
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/*
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u8g_com_arduino_st7920_custom.c
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Additional COM device, initially introduced for 3D Printer community
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Implements a fast SW SPI com subsystem
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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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A special SPI interface for ST7920 controller
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Update for ATOMIC operation done (01 Jun 2013)
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U8G_ATOMIC_OR(ptr, val)
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U8G_ATOMIC_AND(ptr, val)
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U8G_ATOMIC_START();
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U8G_ATOMIC_END();
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*/
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#include "u8g.h"
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#if defined(ARDUINO)
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#if ARDUINO < 100
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#include <WProgram.h>
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#include "wiring_private.h"
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#include "pins_arduino.h"
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#else
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#include <Arduino.h>
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#include "wiring_private.h"
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#endif
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#if defined(__AVR__)
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static uint8_t u8g_bitData, u8g_bitNotData;
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static uint8_t u8g_bitClock, u8g_bitNotClock;
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static volatile uint8_t *u8g_outData;
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static volatile uint8_t *u8g_outClock;
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static void u8g_com_arduino_init_shift_out(uint8_t dataPin, uint8_t clockPin)
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{
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u8g_outData = portOutputRegister(digitalPinToPort(dataPin));
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u8g_outClock = portOutputRegister(digitalPinToPort(clockPin));
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u8g_bitData = digitalPinToBitMask(dataPin);
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u8g_bitClock = digitalPinToBitMask(clockPin);
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u8g_bitNotClock = u8g_bitClock;
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u8g_bitNotClock ^= 0x0ff;
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u8g_bitNotData = u8g_bitData;
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u8g_bitNotData ^= 0x0ff;
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}
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static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val) U8G_NOINLINE;
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static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val)
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{
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uint8_t cnt = 8;
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uint8_t bitData = u8g_bitData;
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uint8_t bitNotData = u8g_bitNotData;
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uint8_t bitClock = u8g_bitClock;
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uint8_t bitNotClock = u8g_bitNotClock;
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volatile uint8_t *outData = u8g_outData;
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volatile uint8_t *outClock = u8g_outClock;
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U8G_ATOMIC_START();
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bitData |= *outData;
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bitNotData &= *outData;
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do
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{
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if ( val & 128 )
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*outData = bitData;
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else
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*outData = bitNotData;
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/*
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*outClock |= bitClock;
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val <<= 1;
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cnt--;
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*outClock &= bitNotClock;
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*/
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val <<= 1;
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*outClock &= bitNotClock;
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cnt--;
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// removed micro delays, because AVRs are too slow and the delay is not required
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//u8g_MicroDelay();
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*outClock |= bitClock;
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//u8g_MicroDelay();
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} while( cnt != 0 );
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U8G_ATOMIC_END();
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}
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#elif defined(__18CXX) || defined(__PIC32MX)
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uint16_t dog_bitData, dog_bitNotData;
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uint16_t dog_bitClock, dog_bitNotClock;
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volatile uint32_t *dog_outData;
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volatile uint32_t *dog_outClock;
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volatile uint32_t dog_pic32_spi_tmp;
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static void u8g_com_arduino_init_shift_out(uint8_t dataPin, uint8_t clockPin)
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{
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dog_outData = portOutputRegister(digitalPinToPort(dataPin));
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dog_outClock = portOutputRegister(digitalPinToPort(clockPin));
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dog_bitData = digitalPinToBitMask(dataPin);
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dog_bitClock = digitalPinToBitMask(clockPin);
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dog_bitNotClock = dog_bitClock;
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dog_bitNotClock ^= 0x0ffff;
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dog_bitNotData = dog_bitData;
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dog_bitNotData ^= 0x0ffff;
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}
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static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val)
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{
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uint8_t cnt = 8;
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U8G_ATOMIC_START();
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do
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{
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if ( val & 128 )
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*dog_outData |= dog_bitData;
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else
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*dog_outData &= dog_bitNotData;
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val <<= 1;
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//u8g_MicroDelay();
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//*dog_outClock |= dog_bitClock;
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*dog_outClock &= dog_bitNotClock;
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cnt--;
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u8g_MicroDelay();
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//*dog_outClock &= dog_bitNotClock;
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*dog_outClock |= dog_bitClock;
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u8g_MicroDelay();
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} while( cnt != 0 );
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U8G_ATOMIC_END();
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}
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#else
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/* default interface, Arduino DUE (__arm__) */
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uint8_t u8g_data_custom_pin;
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uint8_t u8g_clock_custom_pin;
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static void u8g_com_arduino_init_shift_out(uint8_t dataPin, uint8_t clockPin)
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{
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u8g_data_custom_pin = dataPin;
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u8g_clock_custom_pin = clockPin;
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}
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static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val)
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{
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uint8_t cnt = 8;
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do
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{
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if ( val & 128 )
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digitalWrite(u8g_data_custom_pin, HIGH);
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else
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digitalWrite(u8g_data_custom_pin, LOW);
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val <<= 1;
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//u8g_MicroDelay();
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digitalWrite(u8g_clock_custom_pin, LOW);
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cnt--;
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u8g_MicroDelay();
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digitalWrite(u8g_clock_custom_pin, HIGH);
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u8g_MicroDelay();
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} while( cnt != 0 );
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}
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#endif
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static void u8g_com_arduino_st7920_write_byte_seq(uint8_t rs, uint8_t *ptr, uint8_t len)
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{
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uint8_t i;
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if ( rs == 0 )
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{
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/* command */
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u8g_com_arduino_do_shift_out_msb_first(0x0f8);
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}
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else if ( rs == 1 )
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{
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/* data */
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u8g_com_arduino_do_shift_out_msb_first(0x0fa);
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}
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while( len > 0 )
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{
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u8g_com_arduino_do_shift_out_msb_first(*ptr & 0x0f0);
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u8g_com_arduino_do_shift_out_msb_first(*ptr << 4);
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ptr++;
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len--;
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u8g_10MicroDelay();
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}
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for( i = 0; i < 4; i++ )
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u8g_10MicroDelay();
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}
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static void u8g_com_arduino_st7920_write_byte(uint8_t rs, uint8_t val)
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{
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uint8_t i;
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if ( rs == 0 )
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{
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/* command */
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u8g_com_arduino_do_shift_out_msb_first(0x0f8);
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}
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else if ( rs == 1 )
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{
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/* data */
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u8g_com_arduino_do_shift_out_msb_first(0x0fa);
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}
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u8g_com_arduino_do_shift_out_msb_first(val & 0x0f0);
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u8g_com_arduino_do_shift_out_msb_first(val << 4);
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for( i = 0; i < 4; i++ )
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u8g_10MicroDelay();
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}
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uint8_t u8g_com_arduino_st7920_custom_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_assign_pin_output_high(u8g);
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u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
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// u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, LOW);
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u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, HIGH);
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u8g_com_arduino_digital_write(u8g, U8G_PI_MOSI, LOW);
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u8g_com_arduino_init_shift_out(u8g->pin_list[U8G_PI_MOSI], u8g->pin_list[U8G_PI_SCK]);
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u8g->pin_list[U8G_PI_A0_STATE] = 0; /* inital RS state: command mode */
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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, note: the st7920 has an active high chip select */
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u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
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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_SCK, HIGH);
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u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
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}
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break;
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case U8G_COM_MSG_WRITE_BYTE:
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u8g_com_arduino_st7920_write_byte( u8g->pin_list[U8G_PI_A0_STATE], arg_val);
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//u8g->pin_list[U8G_PI_A0_STATE] = 2;
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//u8g_arduino_sw_spi_shift_out(u8g->pin_list[U8G_PI_MOSI], u8g->pin_list[U8G_PI_SCK], arg_val);
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break;
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case U8G_COM_MSG_WRITE_SEQ:
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u8g_com_arduino_st7920_write_byte_seq(u8g->pin_list[U8G_PI_A0_STATE], (uint8_t *)arg_ptr, arg_val);
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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_com_arduino_st7920_write_byte(u8g->pin_list[U8G_PI_A0_STATE], u8g_pgm_read(ptr) );
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//u8g->pin_list[U8G_PI_A0_STATE] = 2;
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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->pin_list[U8G_PI_A0_STATE] = arg_val;
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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_st7920_custom_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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