diff -r 000000000000 -r 88d965579617 components/u8g2/csrc/u8x8_d_st7920.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/components/u8g2/csrc/u8x8_d_st7920.c Tue Oct 08 12:00:31 2019 +0200 @@ -0,0 +1,236 @@ +/* + + u8x8_d_st7920.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_init_seq[] = { + + U8X8_DLY(100), + U8X8_START_TRANSFER(), /* enable chip, delay is part of the transfer start */ + U8X8_DLY(10), + + U8X8_C(0x038), /* 8 Bit interface (DL=1), basic instruction set (RE=0) */ + U8X8_C(0x008), /* 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(4), /* delay 2ms */ + + + U8X8_END_TRANSFER(), /* disable chip */ + U8X8_END() /* end of sequence */ +}; + +static const uint8_t u8x8_d_st7920_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_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_C(0x034), /* 8 Bit interface (DL=1), extended instruction set (RE=1) */ + U8X8_C(0x001), /* Standby mode */ + + U8X8_END_TRANSFER(), /* disable chip */ + U8X8_END() /* end of sequence */ +}; + + +uint8_t u8x8_d_st7920_common(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) +{ + uint8_t x, y, c, i; + uint8_t *ptr; + switch(msg) + { + /* U8X8_MSG_DISPLAY_SETUP_MEMORY is handled by the calling function */ + /* + case U8X8_MSG_DISPLAY_SETUP_MEMORY: + break; + */ + case U8X8_MSG_DISPLAY_INIT: + u8x8_d_helper_display_init(u8x8); + u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_init_seq); + break; + case U8X8_MSG_DISPLAY_SET_POWER_SAVE: + if ( arg_int == 0 ) + u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_powersave0_seq); + else + u8x8_cad_SendSequence(u8x8, u8x8_d_st7920_powersave1_seq); + break; + case U8X8_MSG_DISPLAY_DRAW_TILE: + y = (((u8x8_tile_t *)arg_ptr)->y_pos); + y*=8; + x = ((u8x8_tile_t *)arg_ptr)->x_pos; + x /= 2; /* not sure whether this is a clever idea, problem is, the ST7920 can address only every second tile */ + + if ( y >= 32 ) /* this is the adjustment for 128x64 displays */ + { + y-=32; + x+=8; + } + + u8x8_cad_StartTransfer(u8x8); + + + /* + Tile structure is reused here for the ST7920, however u8x8 is not supported + tile_ptr points to data which has cnt*8 bytes (same as SSD1306 tiles) + Buffer is expected to have 8 lines of code fitting to the ST7920 internal memory + "cnt" includes the number of horizontal bytes. width is equal to cnt*8 + Also important: Width must be a multiple of 16 (ST7920 requirement), so cnt must be even. + + TODO: Consider arg_int, however arg_int is not used by u8g2 + */ + c = ((u8x8_tile_t *)arg_ptr)->cnt; /* number of tiles */ + ptr = ((u8x8_tile_t *)arg_ptr)->tile_ptr; /* data ptr to the tiles */ + /* The following byte is sent to allow the ST7920 to sync up with the data */ + /* it solves some issues with garbage data */ + u8x8_cad_SendCmd(u8x8, 0x03e ); /* enable extended mode */ + u8x8_cad_SendCmd(u8x8, 0x03e ); /* enable extended mode, issue 487 */ + for( i = 0; i < 8; i++ ) + { + //u8x8_cad_SendCmd(u8x8, 0x03e ); /* enable extended mode */ + u8x8_cad_SendCmd(u8x8, 0x080 | (y+i) ); /* y pos */ + u8x8_cad_SendCmd(u8x8, 0x080 | x ); /* set x pos */ + c = ((u8x8_tile_t *)arg_ptr)->cnt; /* number of tiles */ + + //u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, 200, NULL); /* extra dely required */ + u8x8_cad_SendData(u8x8, c, ptr); /* note: SendData can not handle more than 255 bytes, send one line of data */ + ptr += c; + //u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, 200, NULL); /* extra dely required */ + } + + u8x8_cad_EndTransfer(u8x8); + + break; + default: + return 0; + } + return 1; +} + +static const u8x8_display_info_t u8x8_st7920_192x32_display_info = +{ + /* chip_enable_level = */ 1, + /* chip_disable_level = */ 0, + + /* 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 = */ 20, + /* sck_pulse_width_ns = */ 140, /* datasheet ST7920 */ + /* sck_clock_hz = */ 1000000UL, /* since Arduino 1.6.0, the SPI bus speed in Hz. Should be 1000000000/sck_pulse_width_ns */ + /* 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 */ + /* Arduino mode 3: aktive low clock, but use rising edge */ + /* i2c_bus_clock_100kHz = */ 4, + /* data_setup_time_ns = */ 30, + /* write_pulse_width_ns = */ 40, + /* tile_width = */ 24, + /* tile_hight = */ 4, + /* default_x_offset = */ 0, + /* flipmode_x_offset = */ 0, + /* pixel_width = */ 192, + /* pixel_height = */ 32 +}; + +static const u8x8_display_info_t u8x8_st7920_128x64_display_info = +{ + /* chip_enable_level = */ 1, + /* chip_disable_level = */ 0, + + /* 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 = */ 20, + /* sck_pulse_width_ns = */ 140, /* datasheet ST7920 */ + /* sck_clock_hz = */ 1000000UL, /* since Arduino 1.6.0, the SPI bus speed in Hz. Should be 1000000000/sck_pulse_width_ns */ + /* ST7920+Due work with 1MHz but not with 2MHz, ST7920+Uno works with 2MHz */ + /* spi_mode = */ 3, /* active high, rising edge, 18 Aug 16: changed from 1 to 3 which works for 101 */ + /* in theory mode 3 should be correct */ + /* i2c_bus_clock_100kHz = */ 4, + /* data_setup_time_ns = */ 30, + /* write_pulse_width_ns = */ 40, + /* tile_width = */ 16, + /* tile_hight = */ 8, + /* default_x_offset = */ 0, + /* flipmode_x_offset = */ 0, + /* pixel_width = */ 128, + /* pixel_height = */ 64 +}; + +uint8_t u8x8_d_st7920_192x32(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) +{ + switch(msg) + { + case U8X8_MSG_DISPLAY_SETUP_MEMORY: + u8x8_d_helper_display_setup_memory(u8x8, &u8x8_st7920_192x32_display_info); + break; + default: + return u8x8_d_st7920_common(u8x8, msg, arg_int, arg_ptr); + } + return 1; +} + +uint8_t u8x8_d_st7920_128x64(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) +{ + switch(msg) + { + case U8X8_MSG_DISPLAY_SETUP_MEMORY: + u8x8_d_helper_display_setup_memory(u8x8, &u8x8_st7920_128x64_display_info); + break; + default: + return u8x8_d_st7920_common(u8x8, msg, arg_int, arg_ptr); + } + return 1; +} + + + + + + \ No newline at end of file