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st7920

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olikraus 2016-02-10 07:58:13 +01:00
parent e2c76c7800
commit 8a56121da7
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csrc/u8x8_d_st7920_192x32.c Normal file
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/*
u8x8_d_st7920_192x32.c
Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
Copyright (c) 2016, 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.
The ST7920 controller does not support hardware graphics flip.
Contrast adjustment is done by an external resistor --> no support for contrast adjustment
*/
#include "u8x8.h"
static const uint8_t u8x8_d_st7920_192x32_init_seq[] = {
U8X8_DLY(1000),
U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */
U8X8_DLY(1000),
U8X8_C(0x038), /* 8 Bit interface (DL=1), basic instruction set (RE=0) */
U8X8_C(0x00c), /* display on, cursor & blink off; 0x08: all off */
U8X8_C(0x006), /* Entry mode: Cursor move to right ,DDRAM address counter (AC) plus 1, no shift */
U8X8_C(0x002), /* disable scroll, enable CGRAM adress */
//U8X8_C(0x001), /* clear RAM, needs 1.6 ms */
U8X8_DLY(2), /* delay 2ms */
U8X8_C(0x03e), /* enable extended instruction set */
U8X8_C(0x080), /* x */
U8X8_C(0x080), /* y */
U8X8_D1(0x0ff), /* data */
U8X8_D1(0x0ff), /* data */
U8X8_D1(0x0ff), /* data */
U8X8_D1(0x0ff), /* data */
U8X8_D1(0x0ff), /* data */
U8X8_D1(0x0ff), /* data */
U8X8_D1(0x0ff), /* data */
U8X8_D1(0x0ff), /* data */
U8X8_END_TRANSFER(), /* disable chip */
U8X8_END() /* end of sequence */
};
static const uint8_t u8x8_d_st7920_192x32_powersave0_seq[] = {
U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */
U8X8_C(0x038), /* 8 Bit interface (DL=1), basic instruction set (RE=0) */
U8X8_C(0x00c), /* display on, cursor & blink off */
U8X8_END_TRANSFER(), /* disable chip */
U8X8_END() /* end of sequence */
};
static const uint8_t u8x8_d_st7920_192x32_powersave1_seq[] = {
U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */
U8X8_C(0x038), /* 8 Bit interface (DL=1), basic instruction set (RE=0) */
U8X8_C(0x008), /* display off */
U8X8_END_TRANSFER(), /* disable chip */
U8X8_END() /* end of sequence */
};
static const u8x8_display_info_t u8x8_st7920_192x32_display_info =
{
/* chip_enable_level = */ 0,
/* chip_disable_level = */ 1,
/* post_chip_enable_wait_ns = */ 5,
/* pre_chip_disable_wait_ns = */ 5,
/* reset_pulse_width_ms = */ 1,
/* post_reset_wait_ms = */ 6,
/* sda_setup_time_ns = */ 12,
/* sck_pulse_width_ns = */ 75, /* half of cycle time (100ns according to datasheet), AVR: below 70: 8 MHz, >= 70 --> 4MHz clock */
/* sck_takeover_edge = */ 1, /* rising edge */
/* i2c_bus_clock_100kHz = */ 37,
/* data_setup_time_ns = */ 30,
/* write_pulse_width_ns = */ 40,
/* tile_width = */ 24,
/* tile_hight = */ 4,
/* default_x_offset = */ 0,
/* pixel_width = */ 192,
/* pixel_height = */ 32
};
uint8_t u8x8_d_st7920_192x32(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
uint8_t x, y, c;
uint8_t *ptr;
switch(msg)
{
case U8X8_MSG_DISPLAY_SETUP_MEMORY:
u8x8_d_helper_display_setup_memory(u8x8, &u8x8_st7920_192x32_display_info);
break;
case U8X8_MSG_DISPLAY_INIT:
u8x8_d_helper_display_init(u8x8);
u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_192x32_init_seq);
break;
case U8X8_MSG_DISPLAY_SET_POWER_SAVE:
if ( arg_int == 0 )
u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_192x32_powersave0_seq);
else
u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_192x32_powersave1_seq);
break;
case U8X8_MSG_DISPLAY_DRAW_TILE:
y = (((u8x8_tile_t *)arg_ptr)->y_pos);
x = ((u8x8_tile_t *)arg_ptr)->x_pos;
//x *= 8;
//x += u8x8->x_offset;
u8x8_cad_StartTransfer(u8x8);
u8x8_cad_SendCmd(u8x8, 0x03e ); /* enable extended mode */
u8x8_cad_SendCmd(u8x8, 0x080 | y ); /* y pos */
u8x8_cad_SendCmd(u8x8, 0x080 | x ); /* set x pos */
do
{
c = ((u8x8_tile_t *)arg_ptr)->cnt;
ptr = ((u8x8_tile_t *)arg_ptr)->tile_ptr;
u8x8_cad_SendData(u8x8, c*8, ptr); /* note: SendData can not handle more than 255 bytes */
arg_int--;
} while( arg_int > 0 );
u8x8_cad_EndTransfer(u8x8);
break;
default:
return 0;
}
return 1;
}