2 * Copyright © 2023 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20 #include <ao_st7565.h>
25 ao_gpio_set(AO_ST7565_RESET_PORT, AO_ST7565_RESET_PIN, 0);
26 ao_delay(AO_MS_TO_TICKS(100));
27 ao_gpio_set(AO_ST7565_RESET_PORT, AO_ST7565_RESET_PIN, 1);
28 ao_delay(AO_MS_TO_TICKS(100));
33 ao_st7565_start(uint8_t a0)
35 ao_gpio_set(AO_ST7565_A0_PORT, AO_ST7565_A0_PIN, a0);
36 ao_spi_get_bit(AO_ST7565_CS_PORT,
45 ao_spi_put_bit(AO_ST7565_CS_PORT,
48 ao_gpio_set(AO_ST7565_A0_PORT, AO_ST7565_A0_PIN, 1);
53 ao_st7565_instruction(uint8_t cmd)
56 ao_spi_send(&cmd, 1, AO_ST7565_SPI_BUS);
61 ao_st7565_instruction_param(uint8_t cmd, uint8_t param)
63 uint8_t b[2] = { cmd, param };
65 ao_spi_send(b, 2, AO_ST7565_SPI_BUS);
70 ao_st7565_instructions(const uint8_t *cmd, uint16_t len)
73 ao_spi_send(cmd, len, AO_ST7565_SPI_BUS);
78 ao_st7565_data(const void *base, uint16_t len)
81 ao_spi_send(base, len, AO_ST7565_SPI_BUS);
85 static uint8_t brightness;
88 ao_st7565_set_brightness(uint8_t val)
93 ao_st7565_instruction_param(ST7565_ELECTRONIC_VOLUME_SET, val);
97 ao_st7565_get_brightness(void)
102 static bool setup_done;
105 ao_st7565_setup(void)
107 static const uint8_t init[] = {
109 * Should be set to one of ST7565_LCD_BIAS_1_9 or
110 * ST7565_LCD_BIAS_1_7
113 ST7565_ADC_SELECT_NORMAL,
114 ST7565_COMMON_MODE_NORMAL,
115 ST7565_DISPLAY_START_LINE_SET(0),
116 ST7565_POWER_CONTROL_SET(0x4),
123 ao_st7565_instructions(init, sizeof(init));
124 ao_delay(AO_MS_TO_TICKS(50));
125 ao_st7565_instruction(ST7565_POWER_CONTROL_SET(0x6));
126 ao_delay(AO_MS_TO_TICKS(50));
127 ao_st7565_instruction(ST7565_POWER_CONTROL_SET(0x7));
128 ao_delay(AO_MS_TO_TICKS(10));
129 ao_st7565_instruction(ST7565_RESISTOR_RATIO_SET(5));
130 ao_st7565_instruction(ST7565_DISPLAY_ON);
131 ao_st7565_set_brightness(13);
134 static uint8_t rotbuf[AO_ST7565_WIDTH];
136 #define WIDTH AO_ST7565_WIDTH
137 #define HEIGHT AO_ST7565_HEIGHT
138 #define STRIDE AO_BITMAP_STRIDE(WIDTH)
140 static uint32_t previous_image[STRIDE * HEIGHT];
143 ao_st7565_update(struct ao_bitmap *bitmap)
145 int16_t col, c, page;
147 uint32_t *line, *prev, *l;
150 int16_t min_col, min_row, max_col, max_row;
151 int16_t min_page, max_page;
155 min_col = STRIDE - 1;
157 min_row = HEIGHT - 1;
160 prev = previous_image;
161 for (row = 0; row < HEIGHT; row++) {
162 for (col = 0; col < STRIDE; col++) {
179 if (min_col > max_col || min_row > max_row)
182 min_page = min_row >> 3;
183 max_page = max_row >> 3;
184 line = bitmap->base + min_page * 8 * STRIDE + min_col;
186 uint8_t first_col = (uint8_t) (min_col * 32);
187 uint8_t num_col = (uint8_t) (max_col + 1 - min_col) * 32;
189 for (page = min_page; page <= max_page; page++) {
191 ST7565_PAGE_ADDRESS_SET(7-(uint8_t) page),
192 ST7565_COLUMN_ADDRESS_SET_MSN(first_col >> 4),
193 ST7565_COLUMN_ADDRESS_SET_LSN(first_col & 0xf),
196 memset(rotbuf, 0, num_col);
197 for (row = 7; row >= 0; row--) {
201 for (col = min_col; col <= max_col; col++) {
203 for (c = 0; c < 32; c++) {
204 *r++ |= ((bits >> c) & 1) << row;
208 ao_st7565_instructions(i, 4);
209 ao_st7565_data(rotbuf, num_col);
216 memset(previous_image, 0xff, sizeof(previous_image));
217 ao_enable_output(AO_ST7565_RESET_PORT, AO_ST7565_RESET_PIN, 1);
218 ao_enable_output(AO_ST7565_A0_PORT, AO_ST7565_A0_PIN, 1);
220 ao_enable_cs(AO_ST7565_CS_PORT, AO_ST7565_CS_PIN);