forked from trezor/trezor-mcu
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oled.c
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oled.c
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/*
* This file is part of the TREZOR project.
*
* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/spi.h>
#include <string.h>
#include "oled.h"
#include "util.h"
#define OLED_SETCONTRAST 0x81
#define OLED_DISPLAYALLON_RESUME 0xA4
#define OLED_DISPLAYALLON 0xA5
#define OLED_NORMALDISPLAY 0xA6
#define OLED_INVERTDISPLAY 0xA7
#define OLED_DISPLAYOFF 0xAE
#define OLED_DISPLAYON 0xAF
#define OLED_SETDISPLAYOFFSET 0xD3
#define OLED_SETCOMPINS 0xDA
#define OLED_SETVCOMDETECT 0xDB
#define OLED_SETDISPLAYCLOCKDIV 0xD5
#define OLED_SETPRECHARGE 0xD9
#define OLED_SETMULTIPLEX 0xA8
#define OLED_SETLOWCOLUMN 0x00
#define OLED_SETHIGHCOLUMN 0x10
#define OLED_SETSTARTLINE 0x40
#define OLED_MEMORYMODE 0x20
#define OLED_COMSCANINC 0xC0
#define OLED_COMSCANDEC 0xC8
#define OLED_SEGREMAP 0xA0
#define OLED_CHARGEPUMP 0x8D
#define SPI_BASE SPI1
#define OLED_DC_PORT GPIOB
#define OLED_DC_PIN GPIO0 // PB0 | Data/Command
#define OLED_CS_PORT GPIOA
#define OLED_CS_PIN GPIO4 // PA4 | SPI Select
#define OLED_RST_PORT GPIOB
#define OLED_RST_PIN GPIO1 // PB1 | Reset display
/* TREZOR has a display of size OLED_WIDTH x OLED_HEIGHT (128x64).
* The contents of this display are buffered in _oledbuffer. This is
* an array of OLED_WIDTH * OLED_HEIGHT/8 bytes. At byte y*OLED_WIDTH + x
* it stores the column of pixels from (x,8y) to (x,8y+7); the LSB stores
* the top most pixel. The pixel (0,0) is the top left corner of the
* display.
*/
/* Macros to manipulate a single pixel in _oledbuffer:
* OLED_BUFSET(X,Y) sets pixel X,Y (white)
* OLED_BUFCLR(X,Y) clears pixel X,Y (black)
* OLED_BUFTGL(X,Y) toggles pixel X,Y (inverts it)
*/
#define OLED_BUFSET(X,Y) _oledbuffer[OLED_BUFSIZE - 1 - (X) - ((Y)/8)*OLED_WIDTH] |= (1 << (7 - (Y)%8))
#define OLED_BUFCLR(X,Y) _oledbuffer[OLED_BUFSIZE - 1 - (X) - ((Y)/8)*OLED_WIDTH] &= ~(1 << (7 - (Y)%8))
#define OLED_BUFTGL(X,Y) _oledbuffer[OLED_BUFSIZE - 1 - (X) - ((Y)/8)*OLED_WIDTH] ^= (1 << (7 - (Y)%8))
static uint8_t _oledbuffer[OLED_BUFSIZE];
static bool is_debug_mode = 0;
/*
* Send a block of data via the SPI bus.
*/
inline void SPISend(uint32_t base, uint8_t *data, int len)
{
int i;
delay(400);
for (i = 0; i < len; i++) {
spi_send(base, data[i]);
}
delay(800);
}
/*
* Initialize the display.
*/
void oledInit()
{
static uint8_t s[25] = {
OLED_DISPLAYOFF,
OLED_SETDISPLAYCLOCKDIV,
0x80,
OLED_SETMULTIPLEX,
0x3F, // 128x64
OLED_SETDISPLAYOFFSET,
0x00,
OLED_SETSTARTLINE | 0x00,
OLED_CHARGEPUMP,
0x14,
OLED_MEMORYMODE,
0x00,
OLED_SEGREMAP | 0x01,
OLED_COMSCANDEC,
OLED_SETCOMPINS,
0x12, // 128x64
OLED_SETCONTRAST,
0xCF,
OLED_SETPRECHARGE,
0xF1,
OLED_SETVCOMDETECT,
0x40,
OLED_DISPLAYALLON_RESUME,
OLED_NORMALDISPLAY,
OLED_DISPLAYON
};
gpio_clear(OLED_DC_PORT, OLED_DC_PIN); // set to CMD
gpio_set(OLED_CS_PORT, OLED_CS_PIN); // SPI deselect
// Reset the LCD
gpio_set(OLED_RST_PORT, OLED_RST_PIN);
delay(40);
gpio_clear(OLED_RST_PORT, OLED_RST_PIN);
delay(400);
gpio_set(OLED_RST_PORT, OLED_RST_PIN);
// init
gpio_clear(OLED_CS_PORT, OLED_CS_PIN); // SPI select
SPISend(SPI_BASE, s, 25);
gpio_set(OLED_CS_PORT, OLED_CS_PIN); // SPI deselect
oledClear();
oledRefresh();
}
/*
* Clears the display buffer (sets all pixels to black)
*/
void oledClear()
{
memset(_oledbuffer, 0, sizeof(_oledbuffer));
}
/*
* Refresh the display. This copies the buffer to the display to show the
* contents. This must be called after every operation to the buffer to
* make the change visible. All other operations only change the buffer
* not the content of the display.
*/
void oledRefresh()
{
static uint8_t s[3] = {OLED_SETLOWCOLUMN | 0x00, OLED_SETHIGHCOLUMN | 0x00, OLED_SETSTARTLINE | 0x00};
// draw triangle in upper right corner
if (is_debug_mode) {
OLED_BUFTGL(OLED_WIDTH - 5, 0); OLED_BUFTGL(OLED_WIDTH - 4, 0); OLED_BUFTGL(OLED_WIDTH - 3, 0); OLED_BUFTGL(OLED_WIDTH - 2, 0); OLED_BUFTGL(OLED_WIDTH - 1, 0);
OLED_BUFTGL(OLED_WIDTH - 4, 1); OLED_BUFTGL(OLED_WIDTH - 3, 1); OLED_BUFTGL(OLED_WIDTH - 2, 1); OLED_BUFTGL(OLED_WIDTH - 1, 1);
OLED_BUFTGL(OLED_WIDTH - 3, 2); OLED_BUFTGL(OLED_WIDTH - 2, 2); OLED_BUFTGL(OLED_WIDTH - 1, 2);
OLED_BUFTGL(OLED_WIDTH - 2, 3); OLED_BUFTGL(OLED_WIDTH - 1, 3);
OLED_BUFTGL(OLED_WIDTH - 1, 4);
}
gpio_clear(OLED_CS_PORT, OLED_CS_PIN); // SPI select
SPISend(SPI_BASE, s, 3);
gpio_set(OLED_CS_PORT, OLED_CS_PIN); // SPI deselect
gpio_set(OLED_DC_PORT, OLED_DC_PIN); // set to DATA
gpio_clear(OLED_CS_PORT, OLED_CS_PIN); // SPI select
SPISend(SPI_BASE, _oledbuffer, sizeof(_oledbuffer));
gpio_set(OLED_CS_PORT, OLED_CS_PIN); // SPI deselect
gpio_clear(OLED_DC_PORT, OLED_DC_PIN); // set to CMD
// return it back
if (is_debug_mode) {
OLED_BUFTGL(OLED_WIDTH - 5, 0); OLED_BUFTGL(OLED_WIDTH - 4, 0); OLED_BUFTGL(OLED_WIDTH - 3, 0); OLED_BUFTGL(OLED_WIDTH - 2, 0); OLED_BUFTGL(OLED_WIDTH - 1, 0);
OLED_BUFTGL(OLED_WIDTH - 4, 1); OLED_BUFTGL(OLED_WIDTH - 3, 1); OLED_BUFTGL(OLED_WIDTH - 2, 1); OLED_BUFTGL(OLED_WIDTH - 1, 1);
OLED_BUFTGL(OLED_WIDTH - 3, 2); OLED_BUFTGL(OLED_WIDTH - 2, 2); OLED_BUFTGL(OLED_WIDTH - 1, 2);
OLED_BUFTGL(OLED_WIDTH - 2, 3); OLED_BUFTGL(OLED_WIDTH - 1, 3);
OLED_BUFTGL(OLED_WIDTH - 1, 4);
}
}
const uint8_t *oledGetBuffer()
{
return _oledbuffer;
}
void oledSetDebug(bool set)
{
is_debug_mode = set;
oledRefresh();
}
void oledSetBuffer(uint8_t *buf)
{
memcpy(_oledbuffer, buf, sizeof(_oledbuffer));
}
void oledDrawPixel(int x, int y)
{
if ((x < 0) || (y < 0) || (x >= OLED_WIDTH) || (y >= OLED_HEIGHT)) return;
OLED_BUFSET(x,y);
}
void oledClearPixel(int x, int y)
{
if ((x < 0) || (y < 0) || (x >= OLED_WIDTH) || (y >= OLED_HEIGHT)) return;
OLED_BUFCLR(x,y);
}
void oledDrawChar(int x, int y, char c, int zoom)
{
int char_width;
const uint8_t *char_data;
if ((x >= OLED_WIDTH) || (y >= OLED_HEIGHT)) return;
char_width = fontCharWidth(c);
char_data = fontCharData(c);
int xo, yo;
for (xo = 0; xo < char_width; xo++) {
for (yo = 0; yo < FONT_HEIGHT; yo++) {
if (char_data[xo] & (1 << (FONT_HEIGHT - 1 - yo))) {
if (zoom <= 1) {
oledDrawPixel(x + xo, y + yo);
} else {
oledBox(x + xo * zoom, y + yo * zoom, x + (xo + 1) * zoom - 1, y + (yo + 1) * zoom - 1, true);
}
}
}
}
}
char oledConvertChar(const char c) {
uint8_t a = c;
if (a < 0x80) return c;
// UTF-8 handling: https://en.wikipedia.org/wiki/UTF-8#Description
// bytes 11xxxxxx are first byte of UTF-8 characters
// bytes 10xxxxxx are successive UTF-8 characters
if (a >= 0xC0) return '_';
return 0;
}
int oledStringWidth(const char *text) {
if (!text) return 0;
int l = 0;
char c;
for (; *text; text++) {
c = oledConvertChar(*text);
if (c) {
l += fontCharWidth(c) + 1;
}
}
return l;
}
void oledDrawString(int x, int y, const char* text)
{
if (!text) return;
int size = 1;
if (*text == 0x01) { // double size
text++;
size = 2;
}
int l = 0;
char c;
for (; *text; text++) {
c = oledConvertChar(*text);
if (c) {
oledDrawChar(x + l, y, c, size);
l += size * (fontCharWidth(c) + 1);
}
}
}
void oledDrawStringCenter(int y, const char* text)
{
int x = ( OLED_WIDTH - oledStringWidth(text) ) / 2;
oledDrawString(x, y, text);
}
void oledDrawStringRight(int x, int y, const char* text)
{
x -= oledStringWidth(text);
oledDrawString(x, y, text);
}
#define min(X,Y) ((X) < (Y) ? (X) : (Y))
void oledDrawBitmap(int x, int y, const BITMAP *bmp)
{
int i, j;
for (i = 0; i < min(bmp->width, OLED_WIDTH - x); i++) {
for (j = 0; j < min(bmp->height, OLED_HEIGHT - y); j++) {
if (bmp->data[(i / 8) + j * bmp->width / 8] & (1 << (7 - i % 8))) {
OLED_BUFSET(x + i, y + j);
} else {
OLED_BUFCLR(x + i, y + j);
}
}
}
}
void oledInvert(int x1, int y1, int x2, int y2)
{
if ((x1 >= OLED_WIDTH) || (y1 >= OLED_HEIGHT) || (x2 >= OLED_WIDTH) || (y2 >= OLED_HEIGHT)) return;
int x, y;
for (x = x1; x <= x2; x++) {
for (y = y1; y <= y2; y++) {
OLED_BUFTGL(x,y);
}
}
}
/*
* Draw a filled rectangle.
*/
void oledBox(int x1, int y1, int x2, int y2, bool set)
{
int x, y;
for (x = x1; x <= x2; x++) {
for (y = y1; y <= y2; y++) {
set ? oledDrawPixel(x, y) : oledClearPixel(x, y);
}
}
}
void oledHLine(int y) {
int x;
for (x = 0; x < OLED_WIDTH; x++) {
oledDrawPixel(x, y);
}
}
/*
* Draw a rectangle frame.
*/
void oledFrame(int x1, int y1, int x2, int y2)
{
int x, y;
for (x = x1; x <= x2; x++) {
oledDrawPixel(x, y1);
oledDrawPixel(x, y2);
}
for (y = y1 + 1; y < y2; y++) {
oledDrawPixel(x1, y);
oledDrawPixel(x2, y);
}
}
/*
* Animates the display, swiping the current contents out to the left.
* This clears the display.
*/
void oledSwipeLeft(void)
{
int i, j, k;
for (i = 0; i < OLED_WIDTH / 4; i++) {
for (j = 0; j < OLED_HEIGHT / 8; j++) {
for (k = OLED_WIDTH / 4 - 1; k > 0; k--) {
_oledbuffer[k * 4 + 3 + j * OLED_WIDTH] = _oledbuffer[k * 4 - 1 + j * OLED_WIDTH];
_oledbuffer[k * 4 + 2 + j * OLED_WIDTH] = _oledbuffer[k * 4 - 2 + j * OLED_WIDTH];
_oledbuffer[k * 4 + 1 + j * OLED_WIDTH] = _oledbuffer[k * 4 - 3 + j * OLED_WIDTH];
_oledbuffer[k * 4 + 0 + j * OLED_WIDTH] = _oledbuffer[k * 4 - 4 + j * OLED_WIDTH];
}
_oledbuffer[j * OLED_WIDTH] = 0;
_oledbuffer[j * OLED_WIDTH + 1] = 0;
_oledbuffer[j * OLED_WIDTH + 2] = 0;
_oledbuffer[j * OLED_WIDTH + 3] = 0;
}
oledRefresh();
}
}
/*
* Animates the display, swiping the current contents out to the right.
* This clears the display.
*/
void oledSwipeRight(void)
{
int i, j, k;
for (i = 0; i < OLED_WIDTH / 4; i++) {
for (j = 0; j < OLED_HEIGHT / 8; j++) {
for (k = 0; k < OLED_WIDTH / 4 - 1; k++) {
_oledbuffer[k * 4 + 0 + j * OLED_WIDTH] = _oledbuffer[k * 4 + 4 + j * OLED_WIDTH];
_oledbuffer[k * 4 + 1 + j * OLED_WIDTH] = _oledbuffer[k * 4 + 5 + j * OLED_WIDTH];
_oledbuffer[k * 4 + 2 + j * OLED_WIDTH] = _oledbuffer[k * 4 + 6 + j * OLED_WIDTH];
_oledbuffer[k * 4 + 3 + j * OLED_WIDTH] = _oledbuffer[k * 4 + 7 + j * OLED_WIDTH];
}
_oledbuffer[j * OLED_WIDTH + OLED_WIDTH - 1] = 0;
_oledbuffer[j * OLED_WIDTH + OLED_WIDTH - 2] = 0;
_oledbuffer[j * OLED_WIDTH + OLED_WIDTH - 3] = 0;
_oledbuffer[j * OLED_WIDTH + OLED_WIDTH - 4] = 0;
}
oledRefresh();
}
}