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//
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// Created by MightyPork on 2022/12/28.
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//
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#include <stdio.h> |
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#include "pico/stdlib.h" |
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#include "hardware/gpio.h" |
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#include "pico/binary_info.h" |
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#include "hardware/spi.h" |
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#include "framebuffer.h" |
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static const uint DC_PIN = 20; |
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static const uint RST_PIN = 21; |
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#define SSD1309_HEIGHT 64 |
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/* Picotool info */ |
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// Make the SPI pins available to picotool
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bi_decl(bi_2pins_with_func(PICO_DEFAULT_SPI_TX_PIN, PICO_DEFAULT_SPI_SCK_PIN, GPIO_FUNC_SPI)) |
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bi_decl(bi_1pin_with_name(PICO_DEFAULT_SPI_CSN_PIN, "SPI CS")) |
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bi_decl(bi_1pin_with_name(DC_PIN, "OLED DC")) |
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bi_decl(bi_1pin_with_name(RST_PIN, "OLED RST")) |
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static inline void cs_select() { |
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asm volatile("nop \n nop \n nop"); |
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gpio_put(PICO_DEFAULT_SPI_CSN_PIN, 0); // Active low
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asm volatile("nop \n nop \n nop"); |
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} |
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static inline void cs_deselect() { |
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asm volatile("nop \n nop \n nop"); |
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gpio_put(PICO_DEFAULT_SPI_CSN_PIN, 1); |
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asm volatile("nop \n nop \n nop"); |
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} |
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static inline void dc_command() { |
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gpio_put(DC_PIN, 0); |
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} |
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static inline void dc_data() { |
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gpio_put(DC_PIN, 1); |
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} |
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void oled_command16(uint8_t cmd, uint8_t arg) { |
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uint8_t buf[2]; |
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buf[0] = cmd; |
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buf[1] = arg; |
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dc_command(); |
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cs_select(); |
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spi_write_blocking(spi_default, buf, 2); |
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cs_deselect(); |
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} |
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void oled_command(uint8_t cmd) { |
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dc_command(); |
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cs_select(); |
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spi_write_blocking(spi_default, &cmd, 1); |
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cs_deselect(); |
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} |
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void oled_reset() { |
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// Issue a display reset
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gpio_put(RST_PIN, 0); |
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sleep_ms(1); |
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gpio_put(RST_PIN, 1); |
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sleep_ms(1); |
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} |
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void oled_invert(bool invert) { |
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if (invert) { |
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oled_command(0xA6); |
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} else { |
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oled_command(0xA7); |
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} |
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} |
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void oled_init() { |
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// This example will use SPI0 at 10MHz.
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spi_init(spi_default, 10 * 1000 * 1000); |
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gpio_set_function(PICO_DEFAULT_SPI_SCK_PIN, GPIO_FUNC_SPI); |
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gpio_set_function(PICO_DEFAULT_SPI_TX_PIN, GPIO_FUNC_SPI); |
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// Chip select is active-low, so we'll initialise it to a driven-high state
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gpio_init(PICO_DEFAULT_SPI_CSN_PIN); |
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gpio_set_dir(PICO_DEFAULT_SPI_CSN_PIN, GPIO_OUT); |
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gpio_put(PICO_DEFAULT_SPI_CSN_PIN, 1); |
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gpio_init(DC_PIN); |
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gpio_set_dir(DC_PIN, GPIO_OUT); |
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gpio_init(RST_PIN); |
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gpio_set_dir(RST_PIN, GPIO_OUT); |
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oled_reset(); |
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// simplified display init
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oled_command(0xAE); /* Display off */ |
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//oled_command16(0xD5, 0xF0); // set clock speed
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oled_command16(0x20, 0b00); // page addressing mode: 00 - horizontal, 01 vertical, 10 page
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oled_command16(0x81, 0xFF); // contrast
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oled_command(0xAF); /*--turn on SSD1309 panel */ |
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#if 0 |
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/* Init OLED */ |
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oled_command(0xAE); /* Display off */ |
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// Configure the display - only setting things that differ from the default:
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oled_command16(0x20, 0b10); /* Set Memory Addressing Mode */ |
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/* 00,Horizontal Addressing Mode; 01,Vertical Addressing Mode; */ |
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/* 10,Page Addressing Mode (RESET); 11,Invalid */ |
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oled_command(0xB0); /*Set Page Start Address for Page Addressing Mode, B0-B7 */ |
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#ifdef SSD1309_MIRROR_VERT |
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oled_command(0xC1); |
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#else |
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oled_command(0xC0); |
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#endif |
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// lower nibble is value
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oled_command(0x00); /*---set low column address 00~0F */ |
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oled_command(0x10); /*---set high column address 10~1F */ |
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oled_command(0x40); /*--set start line address - 40~7F */ |
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oled_command16(0x81, 0x7F); /*--set contrast control register - ? 0xFF */ |
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#ifdef SSD1309_MIRROR_HORIZ |
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oled_command(0xA1); |
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#else |
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oled_command(0xA0); |
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#endif |
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#ifdef SSD1309_INVERSE_COLOR |
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oled_command(0xA7); /*--set inverse color */ |
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#else |
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oled_command(0xA6); /*--set normal color */ |
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#endif |
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/*--set multiplex ratio(1 to 64) */ |
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#if (SSD1309_HEIGHT == 32) |
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oled_command16(0xA8, 0x1F); |
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#elif (SSD1309_HEIGHT == 64) |
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oled_command16(0xA8, 0x3F); |
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#else |
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#error "bad height" |
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#endif |
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oled_command(0xA4); /* 0xA4, Output follows RAM content;0xa5,Output ignores RAM content */ |
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oled_command16(0xD3, 0x00); /*-set display offset */ |
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oled_command16(0xD5, 0xF0); /*--set display clock divide ratio/oscillator frequency */ |
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oled_command16(0xD9, 0x22); /*--set pre-charge period */ |
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/*--set com pins hardware configuration */ |
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#if (SSD1309_HEIGHT == 32) |
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oled_command16(0xDA, 0x02); |
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#elif (SSD1309_HEIGHT == 64) |
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oled_command16(0xDA, 0x12); |
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#else |
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#error "bad height" |
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#endif |
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oled_command16(0xDB, 0x34); /*--set vcomh */ |
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// ??? not listed in the datasheet
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// oled_command(0x8D); /*--set DC-DC enable */
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// oled_command(0x14); /* */
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oled_command(0xAF); /*--turn on SSD1309 panel */ |
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oled_command(0xA5); // entire display on - for test
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#endif |
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} |
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void oled_data(uint8_t *data, size_t len) { |
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dc_data(); |
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cs_select(); |
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spi_write_blocking(spi_default, data, len); |
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cs_deselect(); |
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} |
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void fb_blit() { |
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oled_data(fb, FB_LEN); |
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} |
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@ -0,0 +1,19 @@ |
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//
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// Created by MightyPork on 2022/12/28.
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//
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#ifndef TEST_PROJECT_OLED_H |
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#define TEST_PROJECT_OLED_H |
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#include <stdint.h> |
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#include <stddef.h> |
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void oled_init(); |
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void oled_reset(); |
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void oled_command(uint8_t cmd); |
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void oled_command16(uint8_t cmd, uint8_t arg); |
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void oled_invert(bool invert); |
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void oled_data(uint8_t *data, size_t len); |
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#endif //TEST_PROJECT_OLED_H
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