diff options
Diffstat (limited to 'ArduinoAddons/Arduino_1.5.x/hardware/marlin/avr/libraries/U8glib/utility/u8g_com_atmega_hw_spi.c')
| -rwxr-xr-x | ArduinoAddons/Arduino_1.5.x/hardware/marlin/avr/libraries/U8glib/utility/u8g_com_atmega_hw_spi.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/ArduinoAddons/Arduino_1.5.x/hardware/marlin/avr/libraries/U8glib/utility/u8g_com_atmega_hw_spi.c b/ArduinoAddons/Arduino_1.5.x/hardware/marlin/avr/libraries/U8glib/utility/u8g_com_atmega_hw_spi.c new file mode 100755 index 000000000..30ee808ea --- /dev/null +++ b/ArduinoAddons/Arduino_1.5.x/hardware/marlin/avr/libraries/U8glib/utility/u8g_com_atmega_hw_spi.c @@ -0,0 +1,174 @@ +/* + + u8g_com_atmega_hw_spi.c + + Universal 8bit Graphics Library + + Copyright (c) 2012, 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. + + + Assumes, that + MOSI is at PORTB, Pin 3 + and + SCK is at PORTB, Pin 5 + +*/ + +#include "u8g.h" + + +#if defined(__AVR__) +#define U8G_ATMEGA_HW_SPI + +/* remove the definition for attiny */ +#if __AVR_ARCH__ == 2 +#undef U8G_ATMEGA_HW_SPI +#endif +#if __AVR_ARCH__ == 25 +#undef U8G_ATMEGA_HW_SPI +#endif +#endif + + +#if defined(U8G_ATMEGA_HW_SPI) + +#include <avr/interrupt.h> +#include <avr/io.h> + + +static uint8_t u8g_atmega_spi_out(uint8_t data) +{ + /* unsigned char x = 100; */ + /* send data */ + SPDR = data; + /* wait for transmission */ + while (!(SPSR & (1<<SPIF))) + ; + /* clear the SPIF flag by reading SPDR */ + return SPDR; +} + + +uint8_t u8g_com_atmega_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) +{ + switch(msg) + { + case U8G_COM_MSG_STOP: + break; + + case U8G_COM_MSG_INIT: + + u8g_SetPIOutput(u8g, U8G_PI_CS); + u8g_SetPIOutput(u8g, U8G_PI_A0); + + 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 */ + u8g_SetPILevel(u8g, U8G_PI_CS, 1); + + /* + SPR1 SPR0 + 0 0 fclk/4 x + 0 1 fclk/16 + 1 0 fclk/64 + 1 1 fclk/128 + */ + SPCR = 0; + SPCR = (1<<SPE) | (1<<MSTR)|(0<<SPR1)|(0<<SPR0)|(0<<CPOL)|(0<<CPHA); +#ifdef U8G_HW_SPI_2X + SPSR = (1 << SPI2X); /* double speed, issue 89 */ +#endif + + break; + + case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */ + u8g_SetPILevel(u8g, U8G_PI_A0, arg_val); + break; + + case U8G_COM_MSG_CHIP_SELECT: + + if ( arg_val == 0 ) + { + /* disable */ + u8g_SetPILevel(u8g, U8G_PI_CS, 1); + } + else + { + PORTB &= ~_BV(5); /* SCK = 0 */ + /* enable */ + u8g_SetPILevel(u8g, U8G_PI_CS, 0); /* CS = 0 (low active) */ + } + + break; + + case U8G_COM_MSG_RESET: + u8g_SetPILevel(u8g, U8G_PI_RESET, arg_val); + break; + + case U8G_COM_MSG_WRITE_BYTE: + u8g_atmega_spi_out(arg_val); + break; + + case U8G_COM_MSG_WRITE_SEQ: + { + register uint8_t *ptr = arg_ptr; + while( arg_val > 0 ) + { + u8g_atmega_spi_out(*ptr++); + arg_val--; + } + } + break; + case U8G_COM_MSG_WRITE_SEQ_P: + { + register uint8_t *ptr = arg_ptr; + while( arg_val > 0 ) + { + u8g_atmega_spi_out(u8g_pgm_read(ptr)); + ptr++; + arg_val--; + } + } + break; + } + return 1; +} + +#else + +uint8_t u8g_com_atmega_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) +{ + return 1; +} + +#endif + + |