You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
216 lines
5.7 KiB
216 lines
5.7 KiB
/*
|
|
|
|
u8g_com_atmega_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 SPI interface for ST7920 controller with HW SPI Support
|
|
|
|
Assumes, that
|
|
MOSI is at PORTB, Pin 3
|
|
and
|
|
SCK is at PORTB, Pin 5
|
|
|
|
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(__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_st7920_hw_spi_shift_out(u8g_t *u8g, uint8_t val) U8G_NOINLINE;
|
|
static uint8_t u8g_atmega_st7920_hw_spi_shift_out(u8g_t *u8g, uint8_t val)
|
|
{
|
|
/* send data */
|
|
SPDR = val;
|
|
/* wait for transmission */
|
|
while (!(SPSR & (1<<SPIF)))
|
|
;
|
|
/* clear the SPIF flag by reading SPDR */
|
|
return SPDR;
|
|
}
|
|
|
|
|
|
static void u8g_com_atmega_st7920_write_byte_hw_spi(u8g_t *u8g, uint8_t rs, uint8_t val) U8G_NOINLINE;
|
|
static void u8g_com_atmega_st7920_write_byte_hw_spi(u8g_t *u8g, uint8_t rs, uint8_t val)
|
|
{
|
|
uint8_t i;
|
|
|
|
if ( rs == 0 )
|
|
{
|
|
/* command */
|
|
u8g_atmega_st7920_hw_spi_shift_out(u8g, 0x0f8);
|
|
}
|
|
else if ( rs == 1 )
|
|
{
|
|
/* data */
|
|
u8g_atmega_st7920_hw_spi_shift_out(u8g, 0x0fa);
|
|
}
|
|
|
|
u8g_atmega_st7920_hw_spi_shift_out(u8g, val & 0x0f0);
|
|
u8g_atmega_st7920_hw_spi_shift_out(u8g, val << 4);
|
|
|
|
for( i = 0; i < 4; i++ )
|
|
u8g_10MicroDelay();
|
|
}
|
|
|
|
|
|
uint8_t u8g_com_atmega_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_SetPIOutput(u8g, U8G_PI_CS);
|
|
//u8g_SetPIOutput(u8g, U8G_PI_A0);
|
|
|
|
U8G_ATOMIC_START();
|
|
|
|
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_ATOMIC_END();
|
|
|
|
u8g_SetPILevel(u8g, U8G_PI_CS, 1);
|
|
|
|
/*
|
|
SPR1 SPR0
|
|
0 0 fclk/4
|
|
0 1 fclk/16
|
|
1 0 fclk/64
|
|
1 1 fclk/128
|
|
*/
|
|
SPCR = 0;
|
|
|
|
/* maybe set CPOL and CPHA to 1 */
|
|
/* 20 Dez 2012: did set CPOL and CPHA to 1 in Arduino variant! */
|
|
/* 24 Jan 2014: implemented, see also issue 221 */
|
|
SPCR = (1<<SPE) | (1<<MSTR)|(0<<SPR1)|(0<<SPR0)|(1<<CPOL)|(1<<CPHA);
|
|
#ifdef U8G_HW_SPI_2X
|
|
SPSR = (1 << SPI2X); /* double speed, issue 89 */
|
|
#endif
|
|
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:
|
|
u8g_SetPILevel(u8g, U8G_PI_RESET, 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;
|
|
|
|
case U8G_COM_MSG_CHIP_SELECT:
|
|
if ( arg_val == 0 )
|
|
{
|
|
/* disable, note: the st7920 has an active high chip select */
|
|
u8g_SetPILevel(u8g, U8G_PI_CS, 0);
|
|
}
|
|
else
|
|
{
|
|
/* u8g_SetPILevel(u8g, U8G_PI_SCK, 0 ); */
|
|
/* enable */
|
|
u8g_SetPILevel(u8g, U8G_PI_CS, 1); /* CS = 1 (high active) */
|
|
}
|
|
break;
|
|
|
|
|
|
case U8G_COM_MSG_WRITE_BYTE:
|
|
u8g_com_atmega_st7920_write_byte_hw_spi(u8g, u8g->pin_list[U8G_PI_A0_STATE], arg_val);
|
|
//u8g->pin_list[U8G_PI_A0_STATE] = 2;
|
|
break;
|
|
|
|
case U8G_COM_MSG_WRITE_SEQ:
|
|
{
|
|
register uint8_t *ptr = arg_ptr;
|
|
while( arg_val > 0 )
|
|
{
|
|
u8g_com_atmega_st7920_write_byte_hw_spi(u8g, u8g->pin_list[U8G_PI_A0_STATE], *ptr++);
|
|
//u8g->pin_list[U8G_PI_A0_STATE] = 2;
|
|
arg_val--;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case U8G_COM_MSG_WRITE_SEQ_P:
|
|
{
|
|
register uint8_t *ptr = arg_ptr;
|
|
while( arg_val > 0 )
|
|
{
|
|
u8g_com_atmega_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;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#else
|
|
|
|
|
|
uint8_t u8g_com_atmega_st7920_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
|