/* u8g_com_arduino_st7920_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. A special HW SPI interface for ST7920 controller */ #include "u8g.h" #if defined(ARDUINO) #if ARDUINO < 100 #include #include "wiring_private.h" #include "pins_arduino.h" #else #include #include "wiring_private.h" #endif #if defined(__AVR__) #define U8G_ARDUINO_ATMEGA_HW_SPI /* remove the definition for attiny */ #if __AVR_ARCH__ == 2 #undef U8G_ARDUINO_ATMEGA_HW_SPI #endif #if __AVR_ARCH__ == 25 #undef U8G_ARDUINO_ATMEGA_HW_SPI #endif #endif #if defined(U8G_ARDUINO_ATMEGA_HW_SPI) #include #include #if ARDUINO < 100 /* fixed pins */ #if defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__) // Sanguino.cc board #define PIN_SCK 7 #define PIN_MISO 6 #define PIN_MOSI 5 #define PIN_CS 4 #else // Arduino Board #define PIN_SCK 13 #define PIN_MISO 12 #define PIN_MOSI 11 #define PIN_CS 10 #endif // (__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__) #else /* use Arduino pin definitions */ #define PIN_SCK SCK #define PIN_MISO MISO #define PIN_MOSI MOSI #define PIN_CS SS #endif static uint8_t u8g_arduino_st7920_hw_spi_shift_out(u8g_t *u8g, uint8_t val) U8G_NOINLINE; static uint8_t u8g_arduino_st7920_hw_spi_shift_out(u8g_t *u8g, uint8_t val) { /* send data */ SPDR = val; /* wait for transmission */ while (!(SPSR & (1< 0 ) { u8g_arduino_st7920_hw_spi_shift_out(u8g, *ptr & 0x0f0); u8g_arduino_st7920_hw_spi_shift_out(u8g, *ptr << 4); ptr++; len--; u8g_10MicroDelay(); } for( i = 0; i < 4; i++ ) u8g_10MicroDelay(); } static void u8g_com_arduino_st7920_write_byte_hw_spi(u8g_t *u8g, uint8_t rs, uint8_t val) U8G_NOINLINE; static void u8g_com_arduino_st7920_write_byte_hw_spi(u8g_t *u8g, uint8_t rs, uint8_t val) { uint8_t i; if ( rs == 0 ) { /* command */ u8g_arduino_st7920_hw_spi_shift_out(u8g, 0x0f8); } else if ( rs == 1 ) { /* data */ u8g_arduino_st7920_hw_spi_shift_out(u8g, 0x0fa); } else { /* do nothing, keep same state */ } u8g_arduino_st7920_hw_spi_shift_out(u8g, val & 0x0f0); u8g_arduino_st7920_hw_spi_shift_out(u8g, val << 4); for( i = 0; i < 4; i++ ) u8g_10MicroDelay(); } uint8_t u8g_com_arduino_st7920_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_assign_pin_output_high(u8g); /* code from u8g_com-arduino_hw_spi.c */ pinMode(PIN_SCK, OUTPUT); digitalWrite(PIN_SCK, LOW); pinMode(PIN_MOSI, OUTPUT); digitalWrite(PIN_MOSI, LOW); /* pinMode(PIN_MISO, INPUT); */ pinMode(PIN_CS, OUTPUT); /* system chip select for the atmega board */ digitalWrite(PIN_CS, HIGH); //u8g_com_arduino_digital_write(u8g, U8G_PI_CS, LOW); #ifdef OBSOLETE DDRB |= _BV(3); /* D0, MOSI */ DDRB |= _BV(5); /* SCK */ DDRB |= _BV(2); /* slave select */ PORTB &= ~_BV(3); /* D0, MOSI = 0 */ PORTB &= ~_BV(5); /* SCK = 0 */ #endif /* SPR1 SPR0 0 0 fclk/4 0 1 fclk/16 1 0 fclk/64 1 1 fclk/128 */ SPCR = 0; /* 20 Dez 2012: set CPOL and CPHA to 1 !!! */ SPCR = (1<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, LOW); u8g_com_arduino_digital_write(u8g, U8G_PI_CS, HIGH); } break; case U8G_COM_MSG_WRITE_BYTE: u8g_com_arduino_st7920_write_byte_hw_spi(u8g, 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_hw_spi_seq(u8g, u8g->pin_list[U8G_PI_A0_STATE], (uint8_t *)arg_ptr, arg_val); /* { register uint8_t *ptr = arg_ptr; while( arg_val > 0 ) { u8g_com_arduino_st7920_write_byte_hw_spi(u8g, u8g->pin_list[U8G_PI_A0_STATE], *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_hw_spi(u8g, 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 uint8_t u8g_com_arduino_st7920_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) { return 1; } #endif #else /* ARDUINO */ uint8_t u8g_com_arduino_st7920_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) { return 1; } #endif /* ARDUINO */