diff options
Diffstat (limited to 'drivers/lcd/st7565.c')
| -rw-r--r-- | drivers/lcd/st7565.c | 479 |
1 files changed, 479 insertions, 0 deletions
diff --git a/drivers/lcd/st7565.c b/drivers/lcd/st7565.c new file mode 100644 index 0000000000..4b4891ce71 --- /dev/null +++ b/drivers/lcd/st7565.c @@ -0,0 +1,479 @@ +/* +Copyright 2021 + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "st7565.h" + +#include <string.h> + +#include "keyboard.h" +#include "progmem.h" +#include "timer.h" +#include "wait.h" + +#include ST7565_FONT_H + +// Fundamental Commands +#define CONTRAST 0x81 +#define DISPLAY_ALL_ON 0xA5 +#define DISPLAY_ALL_ON_RESUME 0xA4 +#define NORMAL_DISPLAY 0xA6 +#define DISPLAY_ON 0xAF +#define DISPLAY_OFF 0xAE +#define NOP 0xE3 + +// Addressing Setting Commands +#define PAM_SETCOLUMN_LSB 0x00 +#define PAM_SETCOLUMN_MSB 0x10 +#define PAM_PAGE_ADDR 0xB0 // 0xb0 -- 0xb7 + +// Hardware Configuration Commands +#define DISPLAY_START_LINE 0x40 +#define SEGMENT_REMAP 0xA0 +#define SEGMENT_REMAP_INV 0xA1 +#define COM_SCAN_INC 0xC0 +#define COM_SCAN_DEC 0xC8 +#define LCD_BIAS_7 0xA3 +#define LCD_BIAS_9 0xA2 +#define RESISTOR_RATIO 0x20 +#define POWER_CONTROL 0x28 + +// Misc defines +#ifndef ST7565_BLOCK_COUNT +# define ST7565_BLOCK_COUNT (sizeof(ST7565_BLOCK_TYPE) * 8) +#endif +#ifndef ST7565_BLOCK_SIZE +# define ST7565_BLOCK_SIZE (ST7565_MATRIX_SIZE / ST7565_BLOCK_COUNT) +#endif + +#define ST7565_ALL_BLOCKS_MASK (((((ST7565_BLOCK_TYPE)1 << (ST7565_BLOCK_COUNT - 1)) - 1) << 1) | 1) + +#define HAS_FLAGS(bits, flags) ((bits & flags) == flags) + +// Display buffer's is the same as the display memory layout +// this is so we don't end up with rounding errors with +// parts of the display unusable or don't get cleared correctly +// and also allows for drawing & inverting +uint8_t st7565_buffer[ST7565_MATRIX_SIZE]; +uint8_t * st7565_cursor; +ST7565_BLOCK_TYPE st7565_dirty = 0; +bool st7565_initialized = false; +bool st7565_active = false; +display_rotation_t st7565_rotation = DISPLAY_ROTATION_0; +#if ST7565_TIMEOUT > 0 +uint32_t st7565_timeout; +#endif +#if ST7565_UPDATE_INTERVAL > 0 +uint16_t st7565_update_timeout; +#endif + +// Flips the rendering bits for a character at the current cursor position +static void InvertCharacter(uint8_t *cursor) { + const uint8_t *end = cursor + ST7565_FONT_WIDTH; + while (cursor < end) { + *cursor = ~(*cursor); + cursor++; + } +} + +bool st7565_init(display_rotation_t rotation) { + setPinOutput(ST7565_A0_PIN); + writePinHigh(ST7565_A0_PIN); + setPinOutput(ST7565_RST_PIN); + writePinHigh(ST7565_RST_PIN); + + st7565_rotation = st7565_init_user(rotation); + + spi_init(); + spi_start(ST7565_SS_PIN, false, 0, ST7565_SPI_CLK_DIVISOR); + + st7565_reset(); + + st7565_send_cmd(LCD_BIAS_7); + if (!HAS_FLAGS(st7565_rotation, DISPLAY_ROTATION_180)) { + st7565_send_cmd(SEGMENT_REMAP); + st7565_send_cmd(COM_SCAN_DEC); + } else { + st7565_send_cmd(SEGMENT_REMAP_INV); + st7565_send_cmd(COM_SCAN_INC); + } + st7565_send_cmd(DISPLAY_START_LINE | 0x00); + st7565_send_cmd(CONTRAST); + st7565_send_cmd(ST7565_CONTRAST); + st7565_send_cmd(RESISTOR_RATIO | 0x01); + st7565_send_cmd(POWER_CONTROL | 0x04); + wait_ms(50); + st7565_send_cmd(POWER_CONTROL | 0x06); + wait_ms(50); + st7565_send_cmd(POWER_CONTROL | 0x07); + wait_ms(10); + st7565_send_cmd(DISPLAY_ON); + st7565_send_cmd(DISPLAY_ALL_ON_RESUME); + st7565_send_cmd(NORMAL_DISPLAY); + + spi_stop(); + +#if ST7565_TIMEOUT > 0 + st7565_timeout = timer_read32() + ST7565_TIMEOUT; +#endif + + st7565_clear(); + st7565_initialized = true; + st7565_active = true; + return true; +} + +__attribute__((weak)) display_rotation_t st7565_init_user(display_rotation_t rotation) { return rotation; } + +void st7565_clear(void) { + memset(st7565_buffer, 0, sizeof(st7565_buffer)); + st7565_cursor = &st7565_buffer[0]; + st7565_dirty = ST7565_ALL_BLOCKS_MASK; +} + +uint8_t crot(uint8_t a, int8_t n) { + const uint8_t mask = 0x7; + n &= mask; + return a << n | a >> (-n & mask); +} + +void st7565_render(void) { + if (!st7565_initialized) { + return; + } + + // Do we have work to do? + st7565_dirty &= ST7565_ALL_BLOCKS_MASK; + if (!st7565_dirty) { + return; + } + + // Find first dirty block + uint8_t update_start = 0; + while (!(st7565_dirty & ((ST7565_BLOCK_TYPE)1 << update_start))) { + ++update_start; + } + + // Calculate commands to set memory addressing bounds. + uint8_t start_page = ST7565_BLOCK_SIZE * update_start / ST7565_DISPLAY_WIDTH; + uint8_t start_column = ST7565_BLOCK_SIZE * update_start % ST7565_DISPLAY_WIDTH; + // IC has 132 segment drivers, for panels with less width we need to offset the starting column + if (HAS_FLAGS(st7565_rotation, DISPLAY_ROTATION_180)) { + start_column += (132 - ST7565_DISPLAY_WIDTH); + } + + spi_start(ST7565_SS_PIN, false, 0, ST7565_SPI_CLK_DIVISOR); + + st7565_send_cmd(PAM_PAGE_ADDR | start_page); + st7565_send_cmd(PAM_SETCOLUMN_LSB | ((ST7565_COLUMN_OFFSET + start_column) & 0x0f)); + st7565_send_cmd(PAM_SETCOLUMN_MSB | ((ST7565_COLUMN_OFFSET + start_column) >> 4 & 0x0f)); + + st7565_send_data(&st7565_buffer[ST7565_BLOCK_SIZE * update_start], ST7565_BLOCK_SIZE); + + // Turn on display if it is off + st7565_on(); + + // Clear dirty flag + st7565_dirty &= ~((ST7565_BLOCK_TYPE)1 << update_start); +} + +void st7565_set_cursor(uint8_t col, uint8_t line) { + uint16_t index = line * ST7565_DISPLAY_WIDTH + col * ST7565_FONT_WIDTH; + + // Out of bounds? + if (index >= ST7565_MATRIX_SIZE) { + index = 0; + } + + st7565_cursor = &st7565_buffer[index]; +} + +void st7565_advance_page(bool clearPageRemainder) { + uint16_t index = st7565_cursor - &st7565_buffer[0]; + uint8_t remaining = ST7565_DISPLAY_WIDTH - (index % ST7565_DISPLAY_WIDTH); + + if (clearPageRemainder) { + // Remaining Char count + remaining = remaining / ST7565_FONT_WIDTH; + + // Write empty character until next line + while (remaining--) st7565_write_char(' ', false); + } else { + // Next page index out of bounds? + if (index + remaining >= ST7565_MATRIX_SIZE) { + index = 0; + remaining = 0; + } + + st7565_cursor = &st7565_buffer[index + remaining]; + } +} + +void st7565_advance_char(void) { + uint16_t nextIndex = st7565_cursor - &st7565_buffer[0] + ST7565_FONT_WIDTH; + uint8_t remainingSpace = ST7565_DISPLAY_WIDTH - (nextIndex % ST7565_DISPLAY_WIDTH); + + // Do we have enough space on the current line for the next character + if (remainingSpace < ST7565_FONT_WIDTH) { + nextIndex += remainingSpace; + } + + // Did we go out of bounds + if (nextIndex >= ST7565_MATRIX_SIZE) { + nextIndex = 0; + } + + // Update cursor position + st7565_cursor = &st7565_buffer[nextIndex]; +} + +// Main handler that writes character data to the display buffer +void st7565_write_char(const char data, bool invert) { + // Advance to the next line if newline + if (data == '\n') { + // Old source wrote ' ' until end of line... + st7565_advance_page(true); + return; + } + + if (data == '\r') { + st7565_advance_page(false); + return; + } + + // copy the current render buffer to check for dirty after + static uint8_t st7565_temp_buffer[ST7565_FONT_WIDTH]; + memcpy(&st7565_temp_buffer, st7565_cursor, ST7565_FONT_WIDTH); + + _Static_assert(sizeof(font) >= ((ST7565_FONT_END + 1 - ST7565_FONT_START) * ST7565_FONT_WIDTH), "ST7565_FONT_END references outside array"); + + // set the reder buffer data + uint8_t cast_data = (uint8_t)data; // font based on unsigned type for index + if (cast_data < ST7565_FONT_START || cast_data > ST7565_FONT_END) { + memset(st7565_cursor, 0x00, ST7565_FONT_WIDTH); + } else { + const uint8_t *glyph = &font[(cast_data - ST7565_FONT_START) * ST7565_FONT_WIDTH]; + memcpy_P(st7565_cursor, glyph, ST7565_FONT_WIDTH); + } + + // Invert if needed + if (invert) { + InvertCharacter(st7565_cursor); + } + + // Dirty check + if (memcmp(&st7565_temp_buffer, st7565_cursor, ST7565_FONT_WIDTH)) { + uint16_t index = st7565_cursor - &st7565_buffer[0]; + st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (index / ST7565_BLOCK_SIZE)); + // Edgecase check if the written data spans the 2 chunks + st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << ((index + ST7565_FONT_WIDTH - 1) / ST7565_BLOCK_SIZE)); + } + + // Finally move to the next char + st7565_advance_char(); +} + +void st7565_write(const char *data, bool invert) { + const char *end = data + strlen(data); + while (data < end) { + st7565_write_char(*data, invert); + data++; + } +} + +void st7565_write_ln(const char *data, bool invert) { + st7565_write(data, invert); + st7565_advance_page(true); +} + +void st7565_pan(bool left) { + uint16_t i = 0; + for (uint16_t y = 0; y < ST7565_DISPLAY_HEIGHT / 8; y++) { + if (left) { + for (uint16_t x = 0; x < ST7565_DISPLAY_WIDTH - 1; x++) { + i = y * ST7565_DISPLAY_WIDTH + x; + st7565_buffer[i] = st7565_buffer[i + 1]; + } + } else { + for (uint16_t x = ST7565_DISPLAY_WIDTH - 1; x > 0; x--) { + i = y * ST7565_DISPLAY_WIDTH + x; + st7565_buffer[i] = st7565_buffer[i - 1]; + } + } + } + st7565_dirty = ST7565_ALL_BLOCKS_MASK; +} + +display_buffer_reader_t st7565_read_raw(uint16_t start_index) { + if (start_index > ST7565_MATRIX_SIZE) start_index = ST7565_MATRIX_SIZE; + display_buffer_reader_t ret_reader; + ret_reader.current_element = &st7565_buffer[start_index]; + ret_reader.remaining_element_count = ST7565_MATRIX_SIZE - start_index; + return ret_reader; +} + +void st7565_write_raw_byte(const char data, uint16_t index) { + if (index > ST7565_MATRIX_SIZE) index = ST7565_MATRIX_SIZE; + if (st7565_buffer[index] == data) return; + st7565_buffer[index] = data; + st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (index / ST7565_BLOCK_SIZE)); +} + +void st7565_write_raw(const char *data, uint16_t size) { + uint16_t cursor_start_index = st7565_cursor - &st7565_buffer[0]; + if ((size + cursor_start_index) > ST7565_MATRIX_SIZE) size = ST7565_MATRIX_SIZE - cursor_start_index; + for (uint16_t i = cursor_start_index; i < cursor_start_index + size; i++) { + if (st7565_buffer[i] == data[i]) continue; + st7565_buffer[i] = data[i]; + st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (i / ST7565_BLOCK_SIZE)); + } +} + +void st7565_write_pixel(uint8_t x, uint8_t y, bool on) { + if (x >= ST7565_DISPLAY_WIDTH) { + return; + } + uint16_t index = x + (y / 8) * ST7565_DISPLAY_WIDTH; + if (index >= ST7565_MATRIX_SIZE) { + return; + } + uint8_t data = st7565_buffer[index]; + if (on) { + data |= (1 << (y % 8)); + } else { + data &= ~(1 << (y % 8)); + } + if (st7565_buffer[index] != data) { + st7565_buffer[index] = data; + st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (index / ST7565_BLOCK_SIZE)); + } +} + +#if defined(__AVR__) +void st7565_write_P(const char *data, bool invert) { + uint8_t c = pgm_read_byte(data); + while (c != 0) { + st7565_write_char(c, invert); + c = pgm_read_byte(++data); + } +} + +void st7565_write_ln_P(const char *data, bool invert) { + st7565_write_P(data, invert); + st7565_advance_page(true); +} + +void st7565_write_raw_P(const char *data, uint16_t size) { + uint16_t cursor_start_index = st7565_cursor - &st7565_buffer[0]; + if ((size + cursor_start_index) > ST7565_MATRIX_SIZE) size = ST7565_MATRIX_SIZE - cursor_start_index; + for (uint16_t i = cursor_start_index; i < cursor_start_index + size; i++) { + uint8_t c = pgm_read_byte(data++); + if (st7565_buffer[i] == c) continue; + st7565_buffer[i] = c; + st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (i / ST7565_BLOCK_SIZE)); + } +} +#endif // defined(__AVR__) + +bool st7565_on(void) { + if (!st7565_initialized) { + return st7565_active; + } + +#if ST7565_TIMEOUT > 0 + st7565_timeout = timer_read32() + ST7565_TIMEOUT; +#endif + + if (!st7565_active) { + spi_start(ST7565_SS_PIN, false, 0, ST7565_SPI_CLK_DIVISOR); + st7565_send_cmd(DISPLAY_ON); + spi_stop(); + st7565_active = true; + st7565_on_user(); + } + return st7565_active; +} + +__attribute__((weak)) void st7565_on_user(void) {} + +bool st7565_off(void) { + if (!st7565_initialized) { + return !st7565_active; + } + + if (st7565_active) { + spi_start(ST7565_SS_PIN, false, 0, ST7565_SPI_CLK_DIVISOR); + st7565_send_cmd(DISPLAY_OFF); + spi_stop(); + st7565_active = false; + st7565_off_user(); + } + return !st7565_active; +} + +__attribute__((weak)) void st7565_off_user(void) {} + +bool st7565_is_on(void) { return st7565_active; } + +uint8_t st7565_max_chars(void) { return ST7565_DISPLAY_WIDTH / ST7565_FONT_WIDTH; } + +uint8_t st7565_max_lines(void) { return ST7565_DISPLAY_HEIGHT / ST7565_FONT_HEIGHT; } + +void st7565_task(void) { + if (!st7565_initialized) { + return; + } + +#if ST7565_UPDATE_INTERVAL > 0 + if (timer_elapsed(st7565_update_timeout) >= ST7565_UPDATE_INTERVAL) { + st7565_update_timeout = timer_read(); + st7565_set_cursor(0, 0); + 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) { + writePinLow(ST7565_RST_PIN); + wait_ms(20); + writePinHigh(ST7565_RST_PIN); + wait_ms(20); +} + +spi_status_t st7565_send_cmd(uint8_t cmd) { + writePinLow(ST7565_A0_PIN); + return spi_write(cmd); +} + +spi_status_t st7565_send_data(uint8_t *data, uint16_t length) { + writePinHigh(ST7565_A0_PIN); + return spi_transmit(data, length); +} |