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- /*
-
- u8g_com_arduino_st7920_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.
-
- A special SPI interface for ST7920 controller
-
- Update for ATOMIC operation done (01 Jun 2013)
- U8G_ATOMIC_OR(ptr, val)
- U8G_ATOMIC_AND(ptr, val)
- U8G_ATOMIC_START();
- U8G_ATOMIC_END();
-
-
- */
-
- #include "u8g.h"
-
- #if defined(ARDUINO)
-
- #if ARDUINO < 100
- #include <WProgram.h>
- #include "wiring_private.h"
- #include "pins_arduino.h"
-
- #else
- #include <Arduino.h>
- #include "wiring_private.h"
- #endif
-
- #if defined(__AVR__)
-
- static uint8_t u8g_bitData, u8g_bitNotData;
- static uint8_t u8g_bitClock, u8g_bitNotClock;
- static volatile uint8_t *u8g_outData;
- static volatile uint8_t *u8g_outClock;
-
- static void u8g_com_arduino_init_shift_out(uint8_t dataPin, uint8_t clockPin)
- {
- u8g_outData = portOutputRegister(digitalPinToPort(dataPin));
- u8g_outClock = portOutputRegister(digitalPinToPort(clockPin));
- u8g_bitData = digitalPinToBitMask(dataPin);
- u8g_bitClock = digitalPinToBitMask(clockPin);
-
- u8g_bitNotClock = u8g_bitClock;
- u8g_bitNotClock ^= 0x0ff;
-
- u8g_bitNotData = u8g_bitData;
- u8g_bitNotData ^= 0x0ff;
- }
-
- static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val) U8G_NOINLINE;
- static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val)
- {
- uint8_t cnt = 8;
- uint8_t bitData = u8g_bitData;
- uint8_t bitNotData = u8g_bitNotData;
- uint8_t bitClock = u8g_bitClock;
- uint8_t bitNotClock = u8g_bitNotClock;
- volatile uint8_t *outData = u8g_outData;
- volatile uint8_t *outClock = u8g_outClock;
-
-
- U8G_ATOMIC_START();
- bitData |= *outData;
- bitNotData &= *outData;
- do
- {
- if ( val & 128 )
- *outData = bitData;
- else
- *outData = bitNotData;
-
- /*
- *outClock |= bitClock;
- val <<= 1;
- cnt--;
- *outClock &= bitNotClock;
- */
-
- val <<= 1;
- *outClock &= bitNotClock;
- cnt--;
- // removed micro delays, because AVRs are too slow and the delay is not required
- //u8g_MicroDelay();
- *outClock |= bitClock;
- //u8g_MicroDelay();
- } while( cnt != 0 );
- U8G_ATOMIC_END();
- }
-
- #elif defined(__18CXX) || defined(__PIC32MX)
-
- uint16_t dog_bitData, dog_bitNotData;
- uint16_t dog_bitClock, dog_bitNotClock;
- volatile uint32_t *dog_outData;
- volatile uint32_t *dog_outClock;
- volatile uint32_t dog_pic32_spi_tmp;
-
- static void u8g_com_arduino_init_shift_out(uint8_t dataPin, uint8_t clockPin)
- {
- dog_outData = portOutputRegister(digitalPinToPort(dataPin));
- dog_outClock = portOutputRegister(digitalPinToPort(clockPin));
- dog_bitData = digitalPinToBitMask(dataPin);
- dog_bitClock = digitalPinToBitMask(clockPin);
-
- dog_bitNotClock = dog_bitClock;
- dog_bitNotClock ^= 0x0ffff;
-
- dog_bitNotData = dog_bitData;
- dog_bitNotData ^= 0x0ffff;
- }
-
- static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val)
- {
- uint8_t cnt = 8;
- U8G_ATOMIC_START();
- do
- {
- if ( val & 128 )
- *dog_outData |= dog_bitData;
- else
- *dog_outData &= dog_bitNotData;
- val <<= 1;
- //u8g_MicroDelay();
- //*dog_outClock |= dog_bitClock;
- *dog_outClock &= dog_bitNotClock;
- cnt--;
- u8g_MicroDelay();
- //*dog_outClock &= dog_bitNotClock;
- *dog_outClock |= dog_bitClock;
- u8g_MicroDelay();
-
- } while( cnt != 0 );
- U8G_ATOMIC_END();
- }
-
- #else
-
- /* default interface, Arduino DUE (__arm__) */
-
- uint8_t u8g_data_pin;
- uint8_t u8g_clock_pin;
-
- static void u8g_com_arduino_init_shift_out(uint8_t dataPin, uint8_t clockPin)
- {
- u8g_data_pin = dataPin;
- u8g_clock_pin = clockPin;
- }
-
- static void u8g_com_arduino_do_shift_out_msb_first(uint8_t val)
- {
- uint8_t cnt = 8;
- do
- {
- if ( val & 128 )
- digitalWrite(u8g_data_pin, HIGH);
- else
- digitalWrite(u8g_data_pin, LOW);
- val <<= 1;
- //u8g_MicroDelay();
- digitalWrite(u8g_clock_pin, LOW);
- cnt--;
- u8g_MicroDelay();
- digitalWrite(u8g_clock_pin, HIGH);
- u8g_MicroDelay();
- } while( cnt != 0 );
- }
-
- #endif
-
-
- static void u8g_com_arduino_st7920_write_byte_seq(uint8_t rs, uint8_t *ptr, uint8_t len)
- {
- uint8_t i;
-
- if ( rs == 0 )
- {
- /* command */
- u8g_com_arduino_do_shift_out_msb_first(0x0f8);
- }
- else if ( rs == 1 )
- {
- /* data */
- u8g_com_arduino_do_shift_out_msb_first(0x0fa);
- }
-
- while( len > 0 )
- {
- u8g_com_arduino_do_shift_out_msb_first(*ptr & 0x0f0);
- u8g_com_arduino_do_shift_out_msb_first(*ptr << 4);
- ptr++;
- len--;
- u8g_10MicroDelay();
- }
-
- for( i = 0; i < 4; i++ )
- u8g_10MicroDelay();
- }
-
- static void u8g_com_arduino_st7920_write_byte(uint8_t rs, uint8_t val)
- {
- uint8_t i;
-
- if ( rs == 0 )
- {
- /* command */
- u8g_com_arduino_do_shift_out_msb_first(0x0f8);
- }
- else if ( rs == 1 )
- {
- /* data */
- u8g_com_arduino_do_shift_out_msb_first(0x0fa);
- }
-
- u8g_com_arduino_do_shift_out_msb_first(val & 0x0f0);
- u8g_com_arduino_do_shift_out_msb_first(val << 4);
-
- for( i = 0; i < 4; i++ )
- u8g_10MicroDelay();
-
- }
-
-
- uint8_t u8g_com_arduino_st7920_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_assign_pin_output_high(u8g);
- u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
- // u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, LOW);
- u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, HIGH);
- u8g_com_arduino_digital_write(u8g, U8G_PI_MOSI, LOW);
- u8g_com_arduino_init_shift_out(u8g->pin_list[U8G_PI_MOSI], u8g->pin_list[U8G_PI_SCK]);
- u8g->pin_list[U8G_PI_A0_STATE] = 0; /* inital RS state: command mode */
- 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, note: the st7920 has an active high chip select */
- u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW);
- }
- else
- {
- /* enable */
- //u8g_com_arduino_digital_write(u8g, U8G_PI_SCK, HIGH);
- u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH);
- /* 28 Dec 2013 reassign pins, fixes issue with more than one display */
- /* issue 227 */
- u8g_com_arduino_init_shift_out(u8g->pin_list[U8G_PI_MOSI], u8g->pin_list[U8G_PI_SCK]);
- }
- break;
-
- case U8G_COM_MSG_WRITE_BYTE:
- u8g_com_arduino_st7920_write_byte( u8g->pin_list[U8G_PI_A0_STATE], arg_val);
- //u8g->pin_list[U8G_PI_A0_STATE] = 2;
- //u8g_arduino_sw_spi_shift_out(u8g->pin_list[U8G_PI_MOSI], u8g->pin_list[U8G_PI_SCK], arg_val);
- break;
-
- case U8G_COM_MSG_WRITE_SEQ:
- u8g_com_arduino_st7920_write_byte_seq(u8g->pin_list[U8G_PI_A0_STATE], (uint8_t *)arg_ptr, arg_val);
- break;
-
- case U8G_COM_MSG_WRITE_SEQ_P:
- {
- register uint8_t *ptr = arg_ptr;
- while( arg_val > 0 )
- {
- u8g_com_arduino_st7920_write_byte(u8g->pin_list[U8G_PI_A0_STATE], u8g_pgm_read(ptr) );
- //u8g->pin_list[U8G_PI_A0_STATE] = 2;
- ptr++;
- arg_val--;
- }
- }
- break;
-
- case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
- u8g->pin_list[U8G_PI_A0_STATE] = arg_val;
- break;
- }
- return 1;
- }
-
- #else /* ARDUINO */
-
- uint8_t u8g_com_arduino_st7920_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
- {
- return 1;
- }
-
- #endif /* ARDUINO */
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