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trezor-firmware/oled.c
Jochen Hoenicke 5dae02bbbf
Faster SPI communication 
According to specs, the display can handle up to 10 MHz SPI traffic
(minimum cycle time is 100 ns). This patch sets the SPI port to
7.5 MHz (60 MHz clock with divisor 8).  In my tests the display works
even fine with SPI frequency at 60 MHz.  I also minimized the delays
(the spec doesn't require a long setup time) and use the registers to
check when transfer is done instead of using a fixed delay.

This patch also changes the swipe function to swipe pixel by pixel.
Otherwise, the swipe would happen too fast to be seen.

This changes the display update time from 11 ms to 1.5 ms.
2016-08-26 18:43:16 +02:00

402 lines
10 KiB
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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(1);
for (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 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; i++) {
for (j = 0; j < OLED_HEIGHT / 8; j++) {
for (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)
{
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();
}
}
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