From: Keith Packard Date: Wed, 8 Mar 2023 23:14:53 +0000 (-0800) Subject: altos: Add ST7565 LCD driver X-Git-Tag: 1.9.18~2^2~85 X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=d65652ac9027475d32510feac9eb8b57a2080d48 altos: Add ST7565 LCD driver This is the chip used by various NewHaven LCD displays Signed-off-by: Keith Packard --- diff --git a/src/drivers/ao_st7565.c b/src/drivers/ao_st7565.c new file mode 100644 index 00000000..e45db4d2 --- /dev/null +++ b/src/drivers/ao_st7565.c @@ -0,0 +1,158 @@ +/* + * Copyright © 2023 Keith Packard + * + * 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, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#include +#include + +static void +ao_st7565_reset(void) +{ + ao_gpio_set(AO_ST7565_RESET_PORT, AO_ST7565_RESET_PIN, 0); + ao_delay(AO_MS_TO_TICKS(100)); + ao_gpio_set(AO_ST7565_RESET_PORT, AO_ST7565_RESET_PIN, 1); + ao_delay(AO_MS_TO_TICKS(100)); +} + + +static void +ao_st7565_start(uint8_t a0) +{ + ao_gpio_set(AO_ST7565_A0_PORT, AO_ST7565_A0_PIN, a0); + ao_spi_get_bit(AO_ST7565_CS_PORT, + AO_ST7565_CS_PIN, + AO_ST7565_SPI_BUS, + AO_ST7565_SPI_SPEED); +} + +static void +ao_st7565_stop(void) +{ + ao_spi_put_bit(AO_ST7565_CS_PORT, + AO_ST7565_CS_PIN, + AO_ST7565_SPI_BUS); + ao_gpio_set(AO_ST7565_A0_PORT, AO_ST7565_A0_PIN, 1); +} + + +static void +ao_st7565_instruction(uint8_t cmd) +{ + ao_st7565_start(0); + ao_spi_send(&cmd, 1, AO_ST7565_SPI_BUS); + ao_st7565_stop(); +} + +static void +ao_st7565_instruction_param(uint8_t cmd, uint8_t param) +{ + uint8_t b[2] = { cmd, param }; + ao_st7565_start(0); + ao_spi_send(b, 2, AO_ST7565_SPI_BUS); + ao_st7565_stop(); +} + +static void +ao_st7565_instructions(uint8_t *cmd, uint16_t len) +{ + ao_st7565_start(0); + ao_spi_send(cmd, len, AO_ST7565_SPI_BUS); + ao_st7565_stop(); +} + +static void +ao_st7565_data(const void *base, uint16_t len) +{ + ao_st7565_start(1); + ao_spi_send(base, len, AO_ST7565_SPI_BUS); + ao_st7565_stop(); +} + +static void +ao_st7565_set_brightness(uint8_t val) +{ + ao_st7565_instruction_param(AO_ST7565_ELECTRONIC_VOLUME_SET, val); +} + +static bool setup_done; + +static void +ao_st7565_setup(void) +{ + if (setup_done) + return; + setup_done = true; + ao_st7565_reset(); + ao_st7565_instruction(AO_ST7565_BIAS); + ao_st7565_instruction(AO_ST7565_ADC_SELECT_NORMAL); + + ao_st7565_instruction(AO_ST7565_COMMON_MODE_NORMAL); + ao_st7565_instruction(AO_ST7565_DISPLAY_START_LINE_SET(0)); + ao_st7565_instruction(AO_ST7565_POWER_CONTROL_SET(0x4)); + ao_delay(AO_MS_TO_TICKS(50)); + ao_st7565_instruction(AO_ST7565_POWER_CONTROL_SET(0x6)); + ao_delay(AO_MS_TO_TICKS(50)); + ao_st7565_instruction(AO_ST7565_POWER_CONTROL_SET(0x7)); + ao_delay(AO_MS_TO_TICKS(10)); + ao_st7565_instruction(AO_ST7565_RESISTOR_RATIO_SET(5)); + ao_st7565_instruction(AO_ST7565_DISPLAY_ON); + ao_st7565_set_brightness(0x10); +} + +static uint8_t rotbuf[AO_ST7565_WIDTH]; + +void +ao_st7565_update(struct ao_bitmap *bitmap) +{ + uint8_t col, c, page; + int row; + uint32_t *line; + uint8_t *r; + + ao_st7565_setup(); + + line = bitmap->base; + for (page = 0; page < 8; page++) { + uint8_t i[4] = { + AO_ST7565_PAGE_ADDRESS_SET(7-page), + AO_ST7565_COLUMN_ADDRESS_SET_MSN(0 >> 4), + AO_ST7565_COLUMN_ADDRESS_SET_MSN(0 & 0xf), + AO_ST7565_RMW + }; + memset(rotbuf, 0, sizeof(rotbuf)); + for (row = 7; row >= 0; row--) { + r = rotbuf; + for (col = 0; col < AO_BITMAP_STRIDE(AO_ST7565_WIDTH); col++) { + uint32_t bits = ~*line++; + for (c = 0; c < 32; c++) { + *r++ |= ((bits >> c) & 1) << row; + } + } + } + ao_st7565_instructions(i, 4); + ao_st7565_data(rotbuf, AO_ST7565_WIDTH); + } +} + +void +ao_st7565_init(void) +{ + ao_enable_output(AO_ST7565_RESET_PORT, AO_ST7565_RESET_PIN, 1); + ao_enable_output(AO_ST7565_A0_PORT, AO_ST7565_A0_PIN, 1); + + ao_enable_cs(AO_ST7565_CS_PORT, AO_ST7565_CS_PIN); +} diff --git a/src/drivers/ao_st7565.h b/src/drivers/ao_st7565.h new file mode 100644 index 00000000..c3f8f1bf --- /dev/null +++ b/src/drivers/ao_st7565.h @@ -0,0 +1,58 @@ +/* + * Copyright © 2023 Keith Packard + * + * 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, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#ifndef _AO_ST7565_H_ +#define _AO_ST7565_H_ + +#include + +#define AO_ST7565_DISPLAY_OFF 0xae +#define AO_ST7565_DISPLAY_ON 0xaf +#define AO_ST7565_DISPLAY_START_LINE_SET(line) (0x40 | (line)) +#define AO_ST7565_PAGE_ADDRESS_SET(page) (0xb0 | (page)) +#define AO_ST7565_COLUMN_ADDRESS_SET_MSN(nib) (0x10 | (nib)) +#define AO_ST7565_COLUMN_ADDRESS_SET_LSN(nib) (0x00 | (nib)) +#define AO_ST7565_ADC_SELECT_NORMAL 0xa0 +#define AO_ST7565_ADC_SELECT_REVERSE 0xa1 +#define AO_ST7565_DISPLAY_NORMAL 0xa6 +#define AO_ST7565_DISPLAY_REVERSE 0xa7 +#define AO_ST7565_DISPLAY_ALL_POINTS_OFF 0xa4 +#define AO_ST7565_DISPLAY_ALL_POINTS_ON 0xa5 +#define AO_ST7565_LCD_BIAS_1_9 0xa2 +#define AO_ST7565_LCD_BIAS_1_7 0xa3 +#define AO_ST7565_RMW 0xe0 +#define AO_ST7565_RMW_END 0xee +#define AO_ST7565_RESET 0xe2 +#define AO_ST7565_COMMON_MODE_NORMAL 0xc0 +#define AO_ST7565_COMMON_MODE_REVERSE 0xc8 +#define AO_ST7565_POWER_CONTROL_SET(pc) (0x28 | (pc)) +#define AO_ST7565_RESISTOR_RATIO_SET(rr) (0x20 | (rr)) +#define AO_ST7565_ELECTRONIC_VOLUME_SET 0x81 +#define AO_ST7565_SLEEP_MODE 0xac +#define AO_ST7565_BOOSTER_RATIO_SET 0xf8 +#define AO_ST7565_NOP 0xe3 + +#define AO_ST7565_SPI_SPEED ao_spi_speed(20000000) + +void +ao_st7565_update(struct ao_bitmap *bitmap); + +void +ao_st7565_init(void); + +#endif /* _AO_ST7565_H_ */