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trezor-firmware/legacy/oled.c

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/*
* This file is part of the Trezor project, https://trezor.io/
*
* 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 "memzero.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.
*/
static uint8_t _oledbuffer[OLED_BUFSIZE];
static bool is_debug_link = 0;
/*
* macros to convert coordinate to bit position
*/
#define OLED_OFFSET(x, y) (OLED_BUFSIZE - 1 - (x) - ((y) / 8) * OLED_WIDTH)
#define OLED_MASK(x, y) (1 << (7 - (y) % 8))
/*
* Return the state of the pixel at x, y
*/
bool oledGetPixel(int x, int y) {
return _oledbuffer[OLED_OFFSET(x, y)] & OLED_MASK(x, y);
}
/*
* Draws a white pixel at x, y
*/
void oledDrawPixel(int x, int y) {
if ((x < 0) || (y < 0) || (x >= OLED_WIDTH) || (y >= OLED_HEIGHT)) {
return;
}
_oledbuffer[OLED_OFFSET(x, y)] |= OLED_MASK(x, y);
}
/*
* Clears pixel at x, y
*/
void oledClearPixel(int x, int y) {
if ((x < 0) || (y < 0) || (x >= OLED_WIDTH) || (y >= OLED_HEIGHT)) {
return;
}
_oledbuffer[OLED_OFFSET(x, y)] &= ~OLED_MASK(x, y);
}
/*
* Inverts pixel at x, y
*/
void oledInvertPixel(int x, int y) {
if ((x < 0) || (y < 0) || (x >= OLED_WIDTH) || (y >= OLED_HEIGHT)) {
return;
}
_oledbuffer[OLED_OFFSET(x, y)] ^= OLED_MASK(x, y);
}
#if !EMULATOR
/*
* Send a block of data via the SPI bus.
*/
static inline void SPISend(uint32_t base, const uint8_t *data, int len) {
delay(1);
for (int i = 0; i < len; i++) {
spi_send(base, data[i]);
}
while (!(SPI_SR(base) & SPI_SR_TXE))
;
while ((SPI_SR(base) & SPI_SR_BSY))
;
}
/*
* Initialize the display.
*/
void oledInit() {
static const 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();
}
#endif
/*
* Clears the display buffer (sets all pixels to black)
*/
void oledClear() { memzero(_oledbuffer, sizeof(_oledbuffer)); }
void oledInvertDebugLink() {
if (is_debug_link) {
oledInvertPixel(OLED_WIDTH - 5, 0);
oledInvertPixel(OLED_WIDTH - 4, 0);
oledInvertPixel(OLED_WIDTH - 3, 0);
oledInvertPixel(OLED_WIDTH - 2, 0);
oledInvertPixel(OLED_WIDTH - 1, 0);
oledInvertPixel(OLED_WIDTH - 4, 1);
oledInvertPixel(OLED_WIDTH - 3, 1);
oledInvertPixel(OLED_WIDTH - 2, 1);
oledInvertPixel(OLED_WIDTH - 1, 1);
oledInvertPixel(OLED_WIDTH - 3, 2);
oledInvertPixel(OLED_WIDTH - 2, 2);
oledInvertPixel(OLED_WIDTH - 1, 2);
oledInvertPixel(OLED_WIDTH - 2, 3);
oledInvertPixel(OLED_WIDTH - 1, 3);
oledInvertPixel(OLED_WIDTH - 1, 4);
}
}
/*
* 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.
*/
#if !EMULATOR
void oledRefresh() {
static const uint8_t s[3] = {OLED_SETLOWCOLUMN | 0x00,
OLED_SETHIGHCOLUMN | 0x00,
OLED_SETSTARTLINE | 0x00};
// draw triangle in upper right corner
oledInvertDebugLink();
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
oledInvertDebugLink();
}
#endif
const uint8_t *oledGetBuffer() { return _oledbuffer; }
void oledSetDebugLink(bool set) {
is_debug_link = set;
oledRefresh();
}
void oledSetBuffer(uint8_t *buf) {
memcpy(_oledbuffer, buf, sizeof(_oledbuffer));
}
void oledDrawChar(int x, int y, char c, uint8_t font) {
if (x >= OLED_WIDTH || y >= OLED_HEIGHT || y <= -FONT_HEIGHT) {
return;
}
int zoom = (font & FONT_DOUBLE) ? 2 : 1;
int char_width = fontCharWidth(font & 0x7f, (uint8_t)c);
const uint8_t *char_data = fontCharData(font & 0x7f, (uint8_t)c);
if (x <= -char_width) {
return;
}
for (int xo = 0; xo < char_width; xo++) {
for (int 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, y + yo * zoom, x + (xo + 1) - 1,
y + (yo + 1) * zoom - 1, true);
}
}
}
}
}
static uint8_t convert_char(const char a) {
static char last_was_utf8 = 0;
uint8_t c = a;
// non-printable ASCII character
if (c < ' ') {
last_was_utf8 = 0;
return 0x7f;
}
// regular ASCII character
if (c < 0x80) {
last_was_utf8 = 0;
return c;
}
// UTF-8 handling: https://en.wikipedia.org/wiki/UTF-8#Description
// bytes 11xxxxxx are first bytes of UTF-8 characters
if (c >= 0xC0) {
last_was_utf8 = 1;
return 0x7f;
}
if (last_was_utf8) {
// bytes 10xxxxxx can be successive UTF-8 characters ...
return 0; // skip glyph
} else {
// ... or they are just non-printable ASCII characters
return 0x7f;
}
return 0;
}
int oledStringWidth(const char *text, uint8_t font) {
if (!text) return 0;
int space = (font & FONT_DOUBLE) ? 2 : 1;
int l = 0;
for (; *text; text++) {
uint8_t c = convert_char(*text);
if (c) {
l += fontCharWidth(font & 0x7f, c) + space;
}
}
return l;
}
void oledDrawString(int x, int y, const char *text, uint8_t font) {
if (!text) return;
int l = 0;
int space = (font & FONT_DOUBLE) ? 2 : 1;
for (; *text; text++) {
uint8_t c = convert_char(*text);
if (c) {
oledDrawChar(x + l, y, c, font);
l += fontCharWidth(font & 0x7f, c) + space;
}
}
}
void oledDrawStringCenter(int x, int y, const char *text, uint8_t font) {
x = x - oledStringWidth(text, font) / 2;
oledDrawString(x, y, text, font);
}
void oledDrawStringRight(int x, int y, const char *text, uint8_t font) {
x -= oledStringWidth(text, font);
oledDrawString(x, y, text, font);
}
void oledDrawBitmap(int x, int y, const BITMAP *bmp) {
for (int i = 0; i < bmp->width; i++) {
for (int j = 0; j < bmp->height; j++) {
if (bmp->data[(i / 8) + j * bmp->width / 8] & (1 << (7 - i % 8))) {
oledDrawPixel(x + i, y + j);
} else {
oledClearPixel(x + i, y + j);
}
}
}
}
/*
* Inverts box between (x1,y1) and (x2,y2) inclusive.
*/
void oledInvert(int x1, int y1, int x2, int y2) {
x1 = MAX(x1, 0);
y1 = MAX(y1, 0);
x2 = MIN(x2, OLED_WIDTH - 1);
y2 = MIN(y2, OLED_HEIGHT - 1);
for (int x = x1; x <= x2; x++) {
for (int y = y1; y <= y2; y++) {
oledInvertPixel(x, y);
}
}
}
/*
* Draw a filled rectangle.
*/
void oledBox(int x1, int y1, int x2, int y2, bool set) {
x1 = MAX(x1, 0);
y1 = MAX(y1, 0);
x2 = MIN(x2, OLED_WIDTH - 1);
y2 = MIN(y2, OLED_HEIGHT - 1);
for (int x = x1; x <= x2; x++) {
for (int y = y1; y <= y2; y++) {
set ? oledDrawPixel(x, y) : oledClearPixel(x, y);
}
}
}
void oledHLine(int y) {
if (y < 0 || y >= OLED_HEIGHT) {
return;
}
for (int x = 0; x < OLED_WIDTH; x++) {
oledDrawPixel(x, y);
}
}
/*
* Draw a rectangle frame.
*/
void oledFrame(int x1, int y1, int x2, int y2) {
for (int x = x1; x <= x2; x++) {
oledDrawPixel(x, y1);
oledDrawPixel(x, y2);
}
for (int 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) {
for (int i = 0; i < OLED_WIDTH; i++) {
for (int j = 0; j < OLED_HEIGHT / 8; j++) {
for (int k = OLED_WIDTH - 1; k > 0; k--) {
_oledbuffer[j * OLED_WIDTH + k] = _oledbuffer[j * OLED_WIDTH + k - 1];
}
_oledbuffer[j * OLED_WIDTH] = 0;
}
oledRefresh();
}
}
/*
* Animates the display, swiping the current contents out to the right.
* This clears the display.
*/
void oledSwipeRight(void) {
for (int i = 0; i < OLED_WIDTH / 4; i++) {
for (int j = 0; j < OLED_HEIGHT / 8; j++) {
for (int 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();
}
}
/*
* Mitigate SCA on lines y1-y2 by setting at least width pixels white
* Pixels grow from the outside (left/right border of the screen)
*/
void oledSCA(int y1, int y2, int width) {
y1 = MAX(y1, 0);
y2 = MIN(y2, OLED_HEIGHT - 1);
for (int y = y1; y <= y2; y++) {
int pix = 0;
for (int x = 0; x < OLED_WIDTH; x++) {
pix += oledGetPixel(x, y);
}
if (width > pix) {
pix = width - pix;
for (int x = 0; x < pix / 2; x++) {
oledDrawPixel(x, y);
}
for (int x = OLED_WIDTH - ((pix + 1) / 2); x < OLED_WIDTH; x++) {
oledDrawPixel(x, y);
}
}
}
}
/*
* Mitigate SCA on lines y1-y2 by setting at least width pixels white
* Pixels grow from the inside (from columns a/b to the right/left)
*/
void oledSCAInside(int y1, int y2, int width, int a, int b) {
y1 = MAX(y1, 0);
y2 = MIN(y2, OLED_HEIGHT - 1);
for (int y = y1; y <= y2; y++) {
int pix = 0;
for (int x = 0; x < OLED_WIDTH; x++) {
pix += oledGetPixel(x, y);
}
if (width > pix) {
pix = width - pix;
for (int x = a - pix / 2; x < a; x++) {
oledDrawPixel(x, y);
}
for (int x = b; x < b + (pix + 1) / 2; x++) {
oledDrawPixel(x, y);
}
}
}
}
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