506 lines
15 KiB
C
506 lines
15 KiB
C
/*
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Copyright 2021
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "st7565.h"
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#include <string.h>
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#include "keyboard.h"
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#include "progmem.h"
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#include "timer.h"
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#include "wait.h"
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#include ST7565_FONT_H
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// Fundamental Commands
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#define CONTRAST 0x81
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#define DISPLAY_ALL_ON 0xA5
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#define DISPLAY_ALL_ON_RESUME 0xA4
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#define NORMAL_DISPLAY 0xA6
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#define INVERT_DISPLAY 0xA7
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#define DISPLAY_ON 0xAF
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#define DISPLAY_OFF 0xAE
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#define NOP 0xE3
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// Addressing Setting Commands
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#define PAM_SETCOLUMN_LSB 0x00
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#define PAM_SETCOLUMN_MSB 0x10
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#define PAM_PAGE_ADDR 0xB0 // 0xb0 -- 0xb7
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// Hardware Configuration Commands
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#define DISPLAY_START_LINE 0x40
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#define SEGMENT_REMAP 0xA0
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#define SEGMENT_REMAP_INV 0xA1
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#define COM_SCAN_INC 0xC0
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#define COM_SCAN_DEC 0xC8
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#define LCD_BIAS_7 0xA3
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#define LCD_BIAS_9 0xA2
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#define RESISTOR_RATIO 0x20
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#define POWER_CONTROL 0x28
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// Misc defines
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#ifndef ST7565_BLOCK_COUNT
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# define ST7565_BLOCK_COUNT (sizeof(ST7565_BLOCK_TYPE) * 8)
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#endif
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#ifndef ST7565_BLOCK_SIZE
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# define ST7565_BLOCK_SIZE (ST7565_MATRIX_SIZE / ST7565_BLOCK_COUNT)
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#endif
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#define ST7565_ALL_BLOCKS_MASK (((((ST7565_BLOCK_TYPE)1 << (ST7565_BLOCK_COUNT - 1)) - 1) << 1) | 1)
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#define HAS_FLAGS(bits, flags) ((bits & flags) == flags)
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// Display buffer's is the same as the display memory layout
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// this is so we don't end up with rounding errors with
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// parts of the display unusable or don't get cleared correctly
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// and also allows for drawing & inverting
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uint8_t st7565_buffer[ST7565_MATRIX_SIZE];
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uint8_t * st7565_cursor;
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ST7565_BLOCK_TYPE st7565_dirty = 0;
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bool st7565_initialized = false;
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bool st7565_active = false;
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bool st7565_inverted = false;
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display_rotation_t st7565_rotation = DISPLAY_ROTATION_0;
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#if ST7565_TIMEOUT > 0
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uint32_t st7565_timeout;
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#endif
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#if ST7565_UPDATE_INTERVAL > 0
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uint16_t st7565_update_timeout;
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#endif
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// Flips the rendering bits for a character at the current cursor position
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static void InvertCharacter(uint8_t *cursor) {
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const uint8_t *end = cursor + ST7565_FONT_WIDTH;
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while (cursor < end) {
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*cursor = ~(*cursor);
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cursor++;
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}
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}
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bool st7565_init(display_rotation_t rotation) {
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gpio_set_pin_output(ST7565_A0_PIN);
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gpio_write_pin_high(ST7565_A0_PIN);
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gpio_set_pin_output(ST7565_RST_PIN);
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gpio_write_pin_high(ST7565_RST_PIN);
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st7565_rotation = st7565_init_user(rotation);
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spi_init();
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spi_start(ST7565_SS_PIN, false, 0, ST7565_SPI_CLK_DIVISOR);
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st7565_reset();
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st7565_send_cmd(LCD_BIAS_7);
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if (!HAS_FLAGS(st7565_rotation, DISPLAY_ROTATION_180)) {
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st7565_send_cmd(SEGMENT_REMAP);
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st7565_send_cmd(COM_SCAN_DEC);
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} else {
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st7565_send_cmd(SEGMENT_REMAP_INV);
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st7565_send_cmd(COM_SCAN_INC);
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}
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st7565_send_cmd(DISPLAY_START_LINE | 0x00);
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st7565_send_cmd(CONTRAST);
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st7565_send_cmd(ST7565_CONTRAST);
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st7565_send_cmd(RESISTOR_RATIO | 0x01);
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st7565_send_cmd(POWER_CONTROL | 0x04);
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wait_ms(50);
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st7565_send_cmd(POWER_CONTROL | 0x06);
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wait_ms(50);
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st7565_send_cmd(POWER_CONTROL | 0x07);
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wait_ms(10);
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st7565_send_cmd(DISPLAY_ON);
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st7565_send_cmd(DISPLAY_ALL_ON_RESUME);
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st7565_send_cmd(NORMAL_DISPLAY);
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spi_stop();
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#if ST7565_TIMEOUT > 0
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st7565_timeout = timer_read32() + ST7565_TIMEOUT;
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#endif
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st7565_clear();
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st7565_initialized = true;
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st7565_active = true;
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return true;
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}
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__attribute__((weak)) display_rotation_t st7565_init_user(display_rotation_t rotation) {
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return rotation;
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}
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void st7565_clear(void) {
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memset(st7565_buffer, 0, sizeof(st7565_buffer));
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st7565_cursor = &st7565_buffer[0];
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st7565_dirty = ST7565_ALL_BLOCKS_MASK;
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}
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uint8_t crot(uint8_t a, int8_t n) {
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const uint8_t mask = 0x7;
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n &= mask;
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return a << n | a >> (-n & mask);
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}
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void st7565_render(void) {
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if (!st7565_initialized) {
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return;
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}
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// Do we have work to do?
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st7565_dirty &= ST7565_ALL_BLOCKS_MASK;
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if (!st7565_dirty) {
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return;
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}
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// Find first dirty block
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uint8_t update_start = 0;
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while (!(st7565_dirty & ((ST7565_BLOCK_TYPE)1 << update_start))) {
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++update_start;
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}
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// Calculate commands to set memory addressing bounds.
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uint8_t start_page = ST7565_BLOCK_SIZE * update_start / ST7565_DISPLAY_WIDTH;
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uint8_t start_column = ST7565_BLOCK_SIZE * update_start % ST7565_DISPLAY_WIDTH;
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// IC has 132 segment drivers, for panels with less width we need to offset the starting column
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if (HAS_FLAGS(st7565_rotation, DISPLAY_ROTATION_180)) {
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start_column += (132 - ST7565_DISPLAY_WIDTH);
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}
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spi_start(ST7565_SS_PIN, false, 0, ST7565_SPI_CLK_DIVISOR);
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st7565_send_cmd(PAM_PAGE_ADDR | start_page);
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st7565_send_cmd(PAM_SETCOLUMN_LSB | ((ST7565_COLUMN_OFFSET + start_column) & 0x0f));
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st7565_send_cmd(PAM_SETCOLUMN_MSB | ((ST7565_COLUMN_OFFSET + start_column) >> 4 & 0x0f));
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st7565_send_data(&st7565_buffer[ST7565_BLOCK_SIZE * update_start], ST7565_BLOCK_SIZE);
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// Turn on display if it is off
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st7565_on();
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// Clear dirty flag
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st7565_dirty &= ~((ST7565_BLOCK_TYPE)1 << update_start);
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}
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void st7565_set_cursor(uint8_t col, uint8_t line) {
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uint16_t index = line * ST7565_DISPLAY_WIDTH + col * ST7565_FONT_WIDTH;
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// Out of bounds?
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if (index >= ST7565_MATRIX_SIZE) {
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index = 0;
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}
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st7565_cursor = &st7565_buffer[index];
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}
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void st7565_advance_page(bool clearPageRemainder) {
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uint16_t index = st7565_cursor - &st7565_buffer[0];
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uint8_t remaining = ST7565_DISPLAY_WIDTH - (index % ST7565_DISPLAY_WIDTH);
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if (clearPageRemainder) {
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// Remaining Char count
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remaining = remaining / ST7565_FONT_WIDTH;
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// Write empty character until next line
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while (remaining--)
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st7565_write_char(' ', false);
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} else {
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// Next page index out of bounds?
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if (index + remaining >= ST7565_MATRIX_SIZE) {
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index = 0;
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remaining = 0;
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}
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st7565_cursor = &st7565_buffer[index + remaining];
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}
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}
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void st7565_advance_char(void) {
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uint16_t nextIndex = st7565_cursor - &st7565_buffer[0] + ST7565_FONT_WIDTH;
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uint8_t remainingSpace = ST7565_DISPLAY_WIDTH - (nextIndex % ST7565_DISPLAY_WIDTH);
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// Do we have enough space on the current line for the next character
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if (remainingSpace < ST7565_FONT_WIDTH) {
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nextIndex += remainingSpace;
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}
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// Did we go out of bounds
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if (nextIndex >= ST7565_MATRIX_SIZE) {
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nextIndex = 0;
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}
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// Update cursor position
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st7565_cursor = &st7565_buffer[nextIndex];
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}
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// Main handler that writes character data to the display buffer
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void st7565_write_char(const char data, bool invert) {
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// Advance to the next line if newline
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if (data == '\n') {
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// Old source wrote ' ' until end of line...
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st7565_advance_page(true);
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return;
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}
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if (data == '\r') {
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st7565_advance_page(false);
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return;
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}
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// copy the current render buffer to check for dirty after
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static uint8_t st7565_temp_buffer[ST7565_FONT_WIDTH];
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memcpy(&st7565_temp_buffer, st7565_cursor, ST7565_FONT_WIDTH);
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_Static_assert(sizeof(font) >= ((ST7565_FONT_END + 1 - ST7565_FONT_START) * ST7565_FONT_WIDTH), "ST7565_FONT_END references outside array");
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// set the reder buffer data
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uint8_t cast_data = (uint8_t)data; // font based on unsigned type for index
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if (cast_data < ST7565_FONT_START || cast_data > ST7565_FONT_END) {
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memset(st7565_cursor, 0x00, ST7565_FONT_WIDTH);
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} else {
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const uint8_t *glyph = &font[(cast_data - ST7565_FONT_START) * ST7565_FONT_WIDTH];
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memcpy_P(st7565_cursor, glyph, ST7565_FONT_WIDTH);
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}
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// Invert if needed
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if (invert) {
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InvertCharacter(st7565_cursor);
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}
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// Dirty check
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if (memcmp(&st7565_temp_buffer, st7565_cursor, ST7565_FONT_WIDTH)) {
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uint16_t index = st7565_cursor - &st7565_buffer[0];
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st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (index / ST7565_BLOCK_SIZE));
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// Edgecase check if the written data spans the 2 chunks
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st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << ((index + ST7565_FONT_WIDTH - 1) / ST7565_BLOCK_SIZE));
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}
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// Finally move to the next char
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st7565_advance_char();
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}
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void st7565_write(const char *data, bool invert) {
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const char *end = data + strlen(data);
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while (data < end) {
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st7565_write_char(*data, invert);
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data++;
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}
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}
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void st7565_write_ln(const char *data, bool invert) {
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st7565_write(data, invert);
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st7565_advance_page(true);
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}
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void st7565_pan(bool left) {
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uint16_t i = 0;
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for (uint16_t y = 0; y < ST7565_DISPLAY_HEIGHT / 8; y++) {
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if (left) {
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for (uint16_t x = 0; x < ST7565_DISPLAY_WIDTH - 1; x++) {
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i = y * ST7565_DISPLAY_WIDTH + x;
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st7565_buffer[i] = st7565_buffer[i + 1];
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}
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} else {
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for (uint16_t x = ST7565_DISPLAY_WIDTH - 1; x > 0; x--) {
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i = y * ST7565_DISPLAY_WIDTH + x;
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st7565_buffer[i] = st7565_buffer[i - 1];
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}
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}
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}
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st7565_dirty = ST7565_ALL_BLOCKS_MASK;
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}
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display_buffer_reader_t st7565_read_raw(uint16_t start_index) {
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if (start_index > ST7565_MATRIX_SIZE) start_index = ST7565_MATRIX_SIZE;
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display_buffer_reader_t ret_reader;
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ret_reader.current_element = &st7565_buffer[start_index];
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ret_reader.remaining_element_count = ST7565_MATRIX_SIZE - start_index;
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return ret_reader;
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}
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void st7565_write_raw_byte(const char data, uint16_t index) {
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if (index > ST7565_MATRIX_SIZE) index = ST7565_MATRIX_SIZE;
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if (st7565_buffer[index] == data) return;
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st7565_buffer[index] = data;
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st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (index / ST7565_BLOCK_SIZE));
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}
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void st7565_write_raw(const char *data, uint16_t size) {
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uint16_t cursor_start_index = st7565_cursor - &st7565_buffer[0];
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if ((size + cursor_start_index) > ST7565_MATRIX_SIZE) size = ST7565_MATRIX_SIZE - cursor_start_index;
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for (uint16_t i = cursor_start_index; i < cursor_start_index + size; i++) {
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uint8_t c = *data++;
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if (st7565_buffer[i] == c) continue;
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st7565_buffer[i] = c;
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st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (i / ST7565_BLOCK_SIZE));
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}
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}
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void st7565_write_pixel(uint8_t x, uint8_t y, bool on) {
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if (x >= ST7565_DISPLAY_WIDTH) {
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return;
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}
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uint16_t index = x + (y / 8) * ST7565_DISPLAY_WIDTH;
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if (index >= ST7565_MATRIX_SIZE) {
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return;
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}
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uint8_t data = st7565_buffer[index];
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if (on) {
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data |= (1 << (y % 8));
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} else {
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data &= ~(1 << (y % 8));
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}
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if (st7565_buffer[index] != data) {
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st7565_buffer[index] = data;
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st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (index / ST7565_BLOCK_SIZE));
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}
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}
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#if defined(__AVR__)
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void st7565_write_P(const char *data, bool invert) {
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uint8_t c = pgm_read_byte(data);
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while (c != 0) {
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st7565_write_char(c, invert);
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c = pgm_read_byte(++data);
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}
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}
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void st7565_write_ln_P(const char *data, bool invert) {
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st7565_write_P(data, invert);
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st7565_advance_page(true);
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}
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void st7565_write_raw_P(const char *data, uint16_t size) {
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uint16_t cursor_start_index = st7565_cursor - &st7565_buffer[0];
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if ((size + cursor_start_index) > ST7565_MATRIX_SIZE) size = ST7565_MATRIX_SIZE - cursor_start_index;
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for (uint16_t i = cursor_start_index; i < cursor_start_index + size; i++) {
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uint8_t c = pgm_read_byte(data++);
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if (st7565_buffer[i] == c) continue;
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st7565_buffer[i] = c;
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st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (i / ST7565_BLOCK_SIZE));
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}
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}
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#endif // defined(__AVR__)
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bool st7565_on(void) {
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if (!st7565_initialized) {
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return st7565_active;
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}
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#if ST7565_TIMEOUT > 0
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st7565_timeout = timer_read32() + ST7565_TIMEOUT;
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#endif
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if (!st7565_active) {
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spi_start(ST7565_SS_PIN, false, 0, ST7565_SPI_CLK_DIVISOR);
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st7565_send_cmd(DISPLAY_ON);
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spi_stop();
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st7565_active = true;
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st7565_on_user();
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}
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return st7565_active;
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}
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__attribute__((weak)) void st7565_on_user(void) {}
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bool st7565_off(void) {
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if (!st7565_initialized) {
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return !st7565_active;
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}
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if (st7565_active) {
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spi_start(ST7565_SS_PIN, false, 0, ST7565_SPI_CLK_DIVISOR);
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st7565_send_cmd(DISPLAY_OFF);
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spi_stop();
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st7565_active = false;
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st7565_off_user();
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}
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return !st7565_active;
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}
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__attribute__((weak)) void st7565_off_user(void) {}
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bool st7565_is_on(void) {
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return st7565_active;
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}
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bool st7565_invert(bool invert) {
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if (!st7565_initialized) {
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return st7565_inverted;
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}
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if (invert != st7565_inverted) {
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spi_start(ST7565_SS_PIN, false, 0, ST7565_SPI_CLK_DIVISOR);
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st7565_send_cmd(invert ? INVERT_DISPLAY : NORMAL_DISPLAY);
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spi_stop();
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st7565_inverted = invert;
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}
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return st7565_inverted;
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}
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uint8_t st7565_max_chars(void) {
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return ST7565_DISPLAY_WIDTH / ST7565_FONT_WIDTH;
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}
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uint8_t st7565_max_lines(void) {
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return ST7565_DISPLAY_HEIGHT / ST7565_FONT_HEIGHT;
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}
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void st7565_task(void) {
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if (!st7565_initialized) {
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return;
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}
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#if ST7565_UPDATE_INTERVAL > 0
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if (timer_elapsed(st7565_update_timeout) >= ST7565_UPDATE_INTERVAL) {
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st7565_update_timeout = timer_read();
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st7565_set_cursor(0, 0);
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st7565_task_user();
|
|
}
|
|
#else
|
|
st7565_set_cursor(0, 0);
|
|
st7565_task_user();
|
|
#endif
|
|
|
|
// Smart render system, no need to check for dirty
|
|
st7565_render();
|
|
|
|
// Display timeout check
|
|
#if ST7565_TIMEOUT > 0
|
|
if (st7565_active && timer_expired32(timer_read32(), st7565_timeout)) {
|
|
st7565_off();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
__attribute__((weak)) void st7565_task_user(void) {}
|
|
|
|
void st7565_reset(void) {
|
|
gpio_write_pin_low(ST7565_RST_PIN);
|
|
wait_ms(20);
|
|
gpio_write_pin_high(ST7565_RST_PIN);
|
|
wait_ms(20);
|
|
}
|
|
|
|
spi_status_t st7565_send_cmd(uint8_t cmd) {
|
|
gpio_write_pin_low(ST7565_A0_PIN);
|
|
return spi_write(cmd);
|
|
}
|
|
|
|
spi_status_t st7565_send_data(uint8_t *data, uint16_t length) {
|
|
gpio_write_pin_high(ST7565_A0_PIN);
|
|
return spi_transmit(data, length);
|
|
}
|