playground project testing RP2040 (Pico) with SSD1309 2.42" OLED from AliExpress
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pico-ssd1309-test/oled.c

200 lines
4.7 KiB

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