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236 lines
8.5 KiB
236 lines
8.5 KiB
/* |
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u8x8_d_st7920.c |
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Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/) |
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Copyright (c) 2016, olikraus@gmail.com |
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All rights reserved. |
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Redistribution and use in source and binary forms, with or without modification, |
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are permitted provided that the following conditions are met: |
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* Redistributions of source code must retain the above copyright notice, this list |
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of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright notice, this |
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list of conditions and the following disclaimer in the documentation and/or other |
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materials provided with the distribution. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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The ST7920 controller does not support hardware graphics flip. |
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Contrast adjustment is done by an external resistor --> no support for contrast adjustment |
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*/ |
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#include "u8x8.h" |
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static const uint8_t u8x8_d_st7920_init_seq[] = { |
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U8X8_DLY(100), |
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U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */ |
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U8X8_DLY(10), |
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U8X8_C(0x038), /* 8 Bit interface (DL=1), basic instruction set (RE=0) */ |
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U8X8_C(0x008), /* display on, cursor & blink off; 0x08: all off */ |
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U8X8_C(0x006), /* Entry mode: Cursor move to right ,DDRAM address counter (AC) plus 1, no shift */ |
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U8X8_C(0x002), /* disable scroll, enable CGRAM adress */ |
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U8X8_C(0x001), /* clear RAM, needs 1.6 ms */ |
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U8X8_DLY(4), /* delay 2ms */ |
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U8X8_END_TRANSFER(), /* disable chip */ |
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U8X8_END() /* end of sequence */ |
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}; |
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static const uint8_t u8x8_d_st7920_powersave0_seq[] = { |
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U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */ |
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U8X8_C(0x038), /* 8 Bit interface (DL=1), basic instruction set (RE=0) */ |
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U8X8_C(0x00c), /* display on, cursor & blink off */ |
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U8X8_END_TRANSFER(), /* disable chip */ |
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U8X8_END() /* end of sequence */ |
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}; |
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static const uint8_t u8x8_d_st7920_powersave1_seq[] = { |
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U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */ |
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U8X8_C(0x038), /* 8 Bit interface (DL=1), basic instruction set (RE=0) */ |
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U8X8_C(0x008), /* display off */ |
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U8X8_C(0x034), /* 8 Bit interface (DL=1), extended instruction set (RE=1) */ |
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U8X8_C(0x001), /* Standby mode */ |
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U8X8_END_TRANSFER(), /* disable chip */ |
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U8X8_END() /* end of sequence */ |
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}; |
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uint8_t u8x8_d_st7920_common(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) |
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{ |
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uint8_t x, y, c, i; |
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uint8_t *ptr; |
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switch(msg) |
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{ |
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/* U8X8_MSG_DISPLAY_SETUP_MEMORY is handled by the calling function */ |
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/* |
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case U8X8_MSG_DISPLAY_SETUP_MEMORY: |
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break; |
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*/ |
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case U8X8_MSG_DISPLAY_INIT: |
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u8x8_d_helper_display_init(u8x8); |
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u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_init_seq); |
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break; |
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case U8X8_MSG_DISPLAY_SET_POWER_SAVE: |
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if ( arg_int == 0 ) |
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u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_powersave0_seq); |
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else |
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u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_powersave1_seq); |
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break; |
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case U8X8_MSG_DISPLAY_DRAW_TILE: |
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y = (((u8x8_tile_t *)arg_ptr)->y_pos); |
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y*=8; |
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x = ((u8x8_tile_t *)arg_ptr)->x_pos; |
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x /= 2; /* not sure whether this is a clever idea, problem is, the ST7920 can address only every second tile */ |
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if ( y >= 32 ) /* this is the adjustment for 128x64 displays */ |
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{ |
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y-=32; |
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x+=8; |
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} |
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u8x8_cad_StartTransfer(u8x8); |
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/* |
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Tile structure is reused here for the ST7920, however u8x8 is not supported |
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tile_ptr points to data which has cnt*8 bytes (same as SSD1306 tiles) |
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Buffer is expected to have 8 lines of code fitting to the ST7920 internal memory |
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"cnt" includes the number of horizontal bytes. width is equal to cnt*8 |
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Also important: Width must be a multiple of 16 (ST7920 requirement), so cnt must be even. |
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TODO: Consider arg_int, however arg_int is not used by u8g2 |
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*/ |
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c = ((u8x8_tile_t *)arg_ptr)->cnt; /* number of tiles */ |
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ptr = ((u8x8_tile_t *)arg_ptr)->tile_ptr; /* data ptr to the tiles */ |
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/* The following byte is sent to allow the ST7920 to sync up with the data */ |
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/* it solves some issues with garbage data */ |
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u8x8_cad_SendCmd(u8x8, 0x03e ); /* enable extended mode */ |
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u8x8_cad_SendCmd(u8x8, 0x03e ); /* enable extended mode, issue 487 */ |
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for( i = 0; i < 8; i++ ) |
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{ |
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//u8x8_cad_SendCmd(u8x8, 0x03e ); /* enable extended mode */ |
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u8x8_cad_SendCmd(u8x8, 0x080 | (y+i) ); /* y pos */ |
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u8x8_cad_SendCmd(u8x8, 0x080 | x ); /* set x pos */ |
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c = ((u8x8_tile_t *)arg_ptr)->cnt; /* number of tiles */ |
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//u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, 200, NULL); /* extra dely required */ |
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u8x8_cad_SendData(u8x8, c, ptr); /* note: SendData can not handle more than 255 bytes, send one line of data */ |
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ptr += c; |
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//u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, 200, NULL); /* extra dely required */ |
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} |
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u8x8_cad_EndTransfer(u8x8); |
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break; |
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default: |
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return 0; |
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} |
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return 1; |
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} |
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static const u8x8_display_info_t u8x8_st7920_192x32_display_info = |
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{ |
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/* chip_enable_level = */ 1, |
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/* chip_disable_level = */ 0, |
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/* post_chip_enable_wait_ns = */ 5, |
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/* pre_chip_disable_wait_ns = */ 5, |
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/* reset_pulse_width_ms = */ 1, |
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/* post_reset_wait_ms = */ 6, |
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/* sda_setup_time_ns = */ 20, |
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/* sck_pulse_width_ns = */ 140, /* datasheet ST7920 */ |
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/* sck_clock_hz = */ 1000000UL, /* since Arduino 1.6.0, the SPI bus speed in Hz. Should be 1000000000/sck_pulse_width_ns */ |
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/* spi_mode = */ 3, /* old: sck_takeover_edge, new: active high (bit 1), rising edge (bit 0), 18 Aug 16: changed from 1 to 3 which works for 101 */ |
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/* Arduino mode 3: aktive low clock, but use rising edge */ |
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/* i2c_bus_clock_100kHz = */ 4, |
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/* data_setup_time_ns = */ 30, |
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/* write_pulse_width_ns = */ 40, |
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/* tile_width = */ 24, |
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/* tile_hight = */ 4, |
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/* default_x_offset = */ 0, |
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/* flipmode_x_offset = */ 0, |
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/* pixel_width = */ 192, |
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/* pixel_height = */ 32 |
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}; |
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static const u8x8_display_info_t u8x8_st7920_128x64_display_info = |
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{ |
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/* chip_enable_level = */ 1, |
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/* chip_disable_level = */ 0, |
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/* post_chip_enable_wait_ns = */ 5, |
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/* pre_chip_disable_wait_ns = */ 5, |
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/* reset_pulse_width_ms = */ 1, |
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/* post_reset_wait_ms = */ 6, |
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/* sda_setup_time_ns = */ 20, |
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/* sck_pulse_width_ns = */ 140, /* datasheet ST7920 */ |
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/* sck_clock_hz = */ 1000000UL, /* since Arduino 1.6.0, the SPI bus speed in Hz. Should be 1000000000/sck_pulse_width_ns */ |
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/* ST7920+Due work with 1MHz but not with 2MHz, ST7920+Uno works with 2MHz */ |
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/* spi_mode = */ 3, /* active high, rising edge, 18 Aug 16: changed from 1 to 3 which works for 101 */ |
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/* in theory mode 3 should be correct */ |
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/* i2c_bus_clock_100kHz = */ 4, |
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/* data_setup_time_ns = */ 30, |
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/* write_pulse_width_ns = */ 40, |
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/* tile_width = */ 16, |
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/* tile_hight = */ 8, |
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/* default_x_offset = */ 0, |
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/* flipmode_x_offset = */ 0, |
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/* pixel_width = */ 128, |
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/* pixel_height = */ 64 |
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}; |
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uint8_t u8x8_d_st7920_192x32(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) |
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{ |
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switch(msg) |
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{ |
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case U8X8_MSG_DISPLAY_SETUP_MEMORY: |
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u8x8_d_helper_display_setup_memory(u8x8, &u8x8_st7920_192x32_display_info); |
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break; |
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default: |
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return u8x8_d_st7920_common(u8x8, msg, arg_int, arg_ptr); |
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} |
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return 1; |
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} |
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uint8_t u8x8_d_st7920_128x64(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) |
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{ |
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switch(msg) |
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{ |
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case U8X8_MSG_DISPLAY_SETUP_MEMORY: |
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u8x8_d_helper_display_setup_memory(u8x8, &u8x8_st7920_128x64_display_info); |
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break; |
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default: |
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return u8x8_d_st7920_common(u8x8, msg, arg_int, arg_ptr); |
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} |
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return 1; |
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} |
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