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toaster-oven-bluepill/Core/Src/app_oled.c

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5.7 KiB

//
// Created by MightyPork on 2022/12/28.
//
#include "ufb/framebuffer.h"
#include "gpio.h"
#define SSD1309_HEIGHT 64
static inline void cs_select()
{
//asm volatile("nop \n nop \n nop");
LL_GPIO_ResetOutputPin(OLED_CS_GPIO_Port, OLED_CS_Pin); // Active low
//asm volatile("nop \n nop \n nop");
}
static inline void cs_deselect()
{
//asm volatile("nop \n nop \n nop");
LL_GPIO_SetOutputPin(OLED_CS_GPIO_Port, OLED_CS_Pin);
//asm volatile("nop \n nop \n nop");
}
static inline void dc_command()
{
LL_GPIO_ResetOutputPin(OLED_DC_GPIO_Port, OLED_DC_Pin); // 0
}
static inline void dc_data()
{
LL_GPIO_SetOutputPin(OLED_DC_GPIO_Port, OLED_DC_Pin); // 1
}
void oled_command16(uint8_t cmd, uint8_t arg)
{
dc_command();
cs_select();
LL_SPI_TransmitData8(SPI_OLED, cmd);
while (!LL_SPI_IsActiveFlag_TXE(SPI_OLED)) {}
LL_SPI_TransmitData8(SPI_OLED, arg);
while (!LL_SPI_IsActiveFlag_TXE(SPI_OLED) || LL_SPI_IsActiveFlag_BSY(SPI_OLED)) {}
cs_deselect();
}
void oled_command(uint8_t cmd)
{
dc_command();
cs_select();
LL_SPI_TransmitData8(SPI_OLED, cmd);
while (!LL_SPI_IsActiveFlag_TXE(SPI_OLED) || LL_SPI_IsActiveFlag_BSY(SPI_OLED)) {}
cs_deselect();
}
void oled_reset()
{
// Issue a display reset
LL_GPIO_ResetOutputPin(OLED_RST_GPIO_Port, OLED_RST_Pin);
LL_mDelay(1);
LL_GPIO_SetOutputPin(OLED_RST_GPIO_Port, OLED_RST_Pin);
LL_mDelay(1);
}
void oled_invert(bool invert)
{
if (invert) {
oled_command(0xA6);
} else {
oled_command(0xA7);
}
}
void oled_init()
{
LL_SPI_Enable(SPI_OLED);
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
}
static void transpose8_and_reverse(const uint8_t *a, uint8_t *b)
{
uint32_t x, y, t;
// Load the array and pack it into x and y.
x = (a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3];
y = (a[4] << 24) | (a[5] << 16) | (a[6] << 8) | a[7];
t = (x ^ (x >> 7)) & 0x00AA00AA;
x = x ^ t ^ (t << 7);
t = (y ^ (y >> 7)) & 0x00AA00AA;
y = y ^ t ^ (t << 7);
t = (x ^ (x >> 14)) & 0x0000CCCC;
x = x ^ t ^ (t << 14);
t = (y ^ (y >> 14)) & 0x0000CCCC;
y = y ^ t ^ (t << 14);
t = (x & 0xF0F0F0F0) | ((y >> 4) & 0x0F0F0F0F);
y = ((x << 4) & 0xF0F0F0F0) | (y & 0x0F0F0F0F);
x = t;
// a[0] = x >> 24;
// a[1] = x >> 16;
// a[2] = x >> 8;
// a[3] = x;
// a[4] = y >> 24;
// a[5] = y >> 16;
// a[6] = y >> 8;
// a[7] = y;
b[7] = x >> 24;
b[6] = x >> 16;
b[5] = x >> 8;
b[4] = x;
b[3] = y >> 24;
b[2] = y >> 16;
b[1] = y >> 8;
b[0] = y;
}
void oled_data(uint8_t *data, int len)
{
dc_data();
cs_select();
while (len-- > 0) {
LL_SPI_TransmitData8(SPI_OLED, *data++);
while (!LL_SPI_IsActiveFlag_TXE(SPI_OLED)) {}
}
while (LL_SPI_IsActiveFlag_BSY(SPI_OLED)) {}
cs_deselect();
}
void fb_blit()
{
#if 0
oled_data(fb, FB_LEN);
#else
dc_data();
cs_select();
// 90deg
uint8_t buf[8];
for (int j = FBW / 8 - 1; j >= 0; j--) {
for (int i = 0; i < FBH / 8; i++) {
// i, j are "square coords" (8x8)
transpose8_and_reverse(&fb[i * FBW + j * 8], buf);
for (int b = 0; b < 8; b++) {
LL_SPI_TransmitData8(SPI_OLED, buf[b]);
while (!LL_SPI_IsActiveFlag_TXE(SPI_OLED)) {}
}
}
}
while (LL_SPI_IsActiveFlag_BSY(SPI_OLED)) {}
cs_deselect();
#endif
}