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LC7981 issue #2191

This commit is contained in:
kraus 2023-08-29 00:14:01 +02:00
parent f710bae7e5
commit 9aa64b7180
2 changed files with 72 additions and 2 deletions
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2
csrc/u8x8_d_lc7981.c
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@ -363,7 +363,7 @@ static const uint8_t u8x8_d_lc7981_240x128_init_seq[] = {
U8X8_CA(0x00, 0x32), /* display on (bit 5), master mode on (bit 4), graphics mode on (bit 1) */
U8X8_CA(0x01, 0x07), /* character/bits per pixel pitch */
U8X8_CA(0x02, 240/8-1), /* number of chars/byte width of the screen */
U8X8_CA(0x03, 128), /* time division, issue https://github.com/olikraus/u8g2/issues/1581 */
U8X8_CA(0x03, 16*8-1), /* time division */
U8X8_CA(0x08, 0x00), /* display start low */
U8X8_CA(0x09, 0x00), /* display start high */

72
sys/arduino/u8g2_page_buffer/I2CLCDBoard/I2CLCDBoard.ino
View File

@ -71,6 +71,7 @@
/* default value for the LED control gpio line */
#define I2C_LCD_LED_DEFAULT I2C_LCD_LED
//#define I2C_LCD_LED_DEFAULT 0
#define I2C_LCD_CTRL_ADR 0x3e
#define I2C_LCD_DATA_ADR 0x3f
@ -177,6 +178,74 @@ uint8_t u8x8_byte_i2c_lcd_gfx_board_t6963_8080(u8x8_t *u8x8, uint8_t msg, uint8_
}
/*
This is an example byte level procedure for a LC7981 board.
This procedure will assume, that the LC7981 is configured in 6800 mode.
Probably the same procedure can be also used for T6963 displays.
In general chip select and write strobe signals may differ and need to be checked.
*/
uint8_t u8x8_byte_i2c_lcd_gfx_board_lc7981_6800(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
/* usually only the following two varibables need to be modified */
uint8_t rw_line = I2C_LCD_RW;
uint8_t write_strobe = I2C_LCD_E; // 6800 mode
uint8_t chip_select = I2C_LCD_CS;
uint8_t *data;
switch(msg)
{
case U8X8_MSG_BYTE_SEND:
u8x8_set_ctrl_bit(u8x8, rw_line, 0);
data = (uint8_t *)arg_ptr;
while( arg_int > 0 )
{
Wire.beginTransmission(I2C_LCD_DATA_ADR);
Wire.write(*data);
Wire.endTransmission();
data++;
arg_int--;
// Assumption: u8x8_set_ctrl_bit() will be slow enough, so that no extra delay is required
//u8x8_gpio_Delay(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->data_setup_time_ns);
u8x8_set_ctrl_bit(u8x8, write_strobe, 1);
//u8x8_gpio_Delay(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->write_pulse_width_ns);
u8x8_set_ctrl_bit(u8x8, write_strobe, 0); // in 6800 mode, data is taken over with the falling edge of the E data line
}
break;
case U8X8_MSG_BYTE_INIT:
Wire.begin();
Wire.setClock(400000); // Assumption: PCF8574A supports fast I2C mode
/* disable chipselect */
u8x8_set_ctrl_bit(u8x8, chip_select, u8x8->display_info->chip_disable_level); // disable display controller
/* low signal level for the R/W line */
u8x8_set_ctrl_bit(u8x8, rw_line, 0); // in 6800 mode, the R/W signal must be low for writing
/* ensure that the enable signal is low */
u8x8_set_ctrl_bit(u8x8, write_strobe, 0); // in 8080 mode, the RW signal is the /WR signal
break;
case U8X8_MSG_BYTE_SET_DC:
u8x8_set_ctrl_bit(u8x8, I2C_LCD_CD, arg_int); // command/data data/command
break;
case U8X8_MSG_BYTE_START_TRANSFER:
u8x8_set_ctrl_bit(u8x8, chip_select, u8x8->display_info->chip_enable_level); // command/data data/command
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->post_chip_enable_wait_ns, NULL);
break;
case U8X8_MSG_BYTE_END_TRANSFER:
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->pre_chip_disable_wait_ns, NULL);
u8x8_set_ctrl_bit(u8x8, chip_select, u8x8->display_info->chip_disable_level); // command/data data/command
break;
default:
return 0;
}
return 1;
}
/*
This is an example byte level procedure for SED1520 / SBN1661 displays.
The display needs to be configured in 6800 mode.
@ -330,7 +399,8 @@ void setup(void)
//u8g2_Setup_t6963_240x128_2(u8g2.getU8g2(), U8G2_R0, u8x8_byte_i2c_lcd_gfx_board_t6963_8080, u8x8_gpio_and_delay_i2c_lcd_gfx_board); // J4
//u8g2_Setup_t6963_128x128_2(u8g2.getU8g2(), U8G2_R0, u8x8_byte_i2c_lcd_gfx_board_t6963_8080, u8x8_gpio_and_delay_i2c_lcd_gfx_board); // J2
//u8g2_Setup_sed1520_122x32_2(u8g2.getU8g2(), U8G2_R0, u8x8_byte_i2c_lcd_gfx_board_sed1520_6800, u8x8_gpio_and_delay_i2c_lcd_gfx_board); // J5
u8g2_Setup_st7920_128x64_2(u8g2.getU8g2(), U8G2_R0, u8x8_byte_i2c_lcd_gfx_board_st7920, u8x8_gpio_and_delay_i2c_lcd_gfx_board); // J3
//u8g2_Setup_st7920_128x64_2(u8g2.getU8g2(), U8G2_R0, u8x8_byte_i2c_lcd_gfx_board_st7920, u8x8_gpio_and_delay_i2c_lcd_gfx_board); // J3
u8g2_Setup_lc7981_240x128_2(u8g2.getU8g2(), U8G2_R0, u8x8_byte_i2c_lcd_gfx_board_lc7981_6800, u8x8_gpio_and_delay_i2c_lcd_gfx_board); // J3
/*
After providing the callback function, start the communication with the display by using u8g2.begin()