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oled.c
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oled.c
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/*
* (c) Copyright 2018 by Coinkite Inc. This file is covered by license found in COPYING-CC.
*/
#include "oled.h"
#include "delay.h"
#include "stm32l4xx_hal_gpio.h"
#include "stm32l4xx_hal_rcc.h"
#include "stm32l4xx_hal_dma.h"
#include "stm32l4xx_hal_spi.h"
#include <string.h>
// Reset and config sequence.
//
// As measured! No attempt to understand them here.
static const uint8_t reset_commands[] = {
0xae, // display off
0x20, 0x00, // horz addr-ing mode
0x40, // ram display start line: 0
0xa1, // cold addr 127 mapped to seg0
0xa8, 0x3f, // set multiplex ratio: 64
0xc8, // remapped mode: scan from COMn to COM0
0xd3, 0x00, // display offset (vertical shift): 0
0xda, 0x12, // seq com pin conf: alt com pin
0xd5, 0x80, // set display clock divide ratio
0xd9, 0xf1, // set pre-change period
0xdb, 0x30, // Cvomh deselect level
0x81, 0xff, // Contrast: max
0xa4, // display ram contents (not all on)
0xa6, // normal not inverted
0x8d, 0x14, // enable charge pump
0xaf // display on
};
// Bytes to send before sending the 1024 bytes of pixel data.
//
static const uint8_t before_show[] = {
0x21, 0x00, 0x7f, // setup column address range (start, end): 0-127
0x22, 0x00, 0x07 // setup page start/end address: 0 - 7
};
// OLED connections:
// - all on port A
// - all push/pull outputs
//
#define RESET_PIN GPIO_PIN_6
#define DC_PIN GPIO_PIN_8
#define CS_PIN GPIO_PIN_4
#define SPI_SCK GPIO_PIN_5
#define SPI_MOSI GPIO_PIN_7
HAL_StatusTypeDef HAL_SPI_Transmit(SPI_HandleTypeDef *hspi, uint8_t *pData, uint16_t Size, uint32_t Timeout);
static SPI_HandleTypeDef spi_port;
// write_bytes()
//
static inline void
write_bytes(int len, const uint8_t *buf)
{
// send via SPI(1)
HAL_SPI_Transmit(&spi_port, (uint8_t *)buf, len, HAL_MAX_DELAY);
}
// oled_write_cmd()
//
void
oled_write_cmd(uint8_t cmd)
{
HAL_GPIO_WritePin(GPIOA, CS_PIN, 1);
HAL_GPIO_WritePin(GPIOA, DC_PIN, 0);
HAL_GPIO_WritePin(GPIOA, CS_PIN, 0);
write_bytes(1, &cmd);
HAL_GPIO_WritePin(GPIOA, CS_PIN, 1);
}
// oled_write_cmd_sequence()
//
void
oled_write_cmd_sequence(int len, const uint8_t *cmds)
{
for(int i=0; i<len; i++) {
oled_write_cmd(cmds[i]);
}
}
// oled_write_data()
//
void
oled_write_data(int len, const uint8_t *pixels)
{
HAL_GPIO_WritePin(GPIOA, CS_PIN, 1);
HAL_GPIO_WritePin(GPIOA, DC_PIN, 1);
HAL_GPIO_WritePin(GPIOA, CS_PIN, 0);
write_bytes(len, pixels);
HAL_GPIO_WritePin(GPIOA, CS_PIN, 1);
}
// oled_spi_setup()
//
// Just setup SPI, do not reset display, etc.
//
void
oled_spi_setup(void)
{
// might already be setup
if(spi_port.Instance == SPI1) return;
memset(&spi_port, 0, sizeof(spi_port));
spi_port.Instance = SPI1;
// see SPI_InitTypeDef
spi_port.Init.Mode = SPI_MODE_MASTER;
spi_port.Init.Direction = SPI_DIRECTION_2LINES;
spi_port.Init.DataSize = SPI_DATASIZE_8BIT;
spi_port.Init.CLKPolarity = SPI_POLARITY_LOW;
spi_port.Init.CLKPhase = SPI_PHASE_1EDGE;
spi_port.Init.NSS = SPI_NSS_SOFT;
spi_port.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16; // conservative
spi_port.Init.FirstBit = SPI_FIRSTBIT_MSB;
spi_port.Init.TIMode = SPI_TIMODE_DISABLED;
spi_port.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
HAL_SPI_Init(&spi_port);
}
// oled_setup()
//
// Ok to call this lots.
//
void
oled_setup(void)
{
static uint32_t inited;
if(inited == 0x238a572F) {
return;
}
inited = 0x238a572F;
// enable some internal clocks
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_SPI1_CLK_ENABLE();
// simple pins
GPIO_InitTypeDef setup = {
.Pin = RESET_PIN | DC_PIN | CS_PIN,
.Mode = GPIO_MODE_OUTPUT_PP,
.Pull = GPIO_NOPULL,
.Speed = GPIO_SPEED_FREQ_MEDIUM,
.Alternate = 0,
};
HAL_GPIO_Init(GPIOA, &setup);
// starting values
HAL_GPIO_WritePin(GPIOA, RESET_PIN | CS_PIN | DC_PIN, 1);
// SPI pins
setup.Pin = SPI_SCK | SPI_MOSI;
setup.Mode = GPIO_MODE_AF_PP;
setup.Alternate = GPIO_AF5_SPI1;
HAL_GPIO_Init(GPIOA, &setup);
// lock the RESET pin so that St's DFU code doesn't clear screen
// it might be trying to use it a MISO signal for SPI loading
HAL_GPIO_LockPin(GPIOA, RESET_PIN | CS_PIN | DC_PIN);
// 10ms low-going pulse on reset pin
delay_ms(1);
HAL_GPIO_WritePin(GPIOA, RESET_PIN, 0);
delay_ms(10);
HAL_GPIO_WritePin(GPIOA, RESET_PIN, 1);
oled_spi_setup();
// where: SPI1->CR1, CR2, SR
// mpy settings:
// '0x354', '0x1700', '0x002'
// this code:
// '0x37c', '0x1700', '0x603'
//SPI1->CR1 = 0x354;
// write a sequence to reset things
oled_write_cmd_sequence(sizeof(reset_commands), reset_commands);
}
// oled_show_raw()
//
// No decompression.
//
void
oled_show_raw(uint32_t len, const uint8_t *pixels)
{
oled_setup();
oled_write_cmd_sequence(sizeof(before_show), before_show);
HAL_GPIO_WritePin(GPIOA, CS_PIN, 1);
HAL_GPIO_WritePin(GPIOA, DC_PIN, 1);
HAL_GPIO_WritePin(GPIOA, CS_PIN, 0);
write_bytes(len, pixels);
HAL_GPIO_WritePin(GPIOA, CS_PIN, 1);
}
// oled_show()
//
// Perform simple RLE decompression.
//
void
oled_show(const uint8_t *pixels)
{
oled_setup();
oled_write_cmd_sequence(sizeof(before_show), before_show);
HAL_GPIO_WritePin(GPIOA, CS_PIN, 1);
HAL_GPIO_WritePin(GPIOA, DC_PIN, 1);
HAL_GPIO_WritePin(GPIOA, CS_PIN, 0);
uint8_t buf[127];
const uint8_t *p = pixels;
// NOTE: must also update code in oled_show_progress, which dups this heavily.
while(1) {
uint8_t hdr = *(p++);
if(!hdr) break;
uint8_t len = hdr & 0x7f;
if(hdr & 0x80) {
// random bytes follow
memcpy(buf, p, len);
p += len;
} else {
// repeat same byte
memset(buf, *p, len);
p++;
}
write_bytes(len, buf);
}
HAL_GPIO_WritePin(GPIOA, CS_PIN, 1);
}
// oled_show_progress()
//
// Perform simple RLE decompression, and add a bar on final screen line.
//
void
oled_show_progress(const uint8_t *pixels, int progress)
{
oled_setup();
oled_write_cmd_sequence(sizeof(before_show), before_show);
HAL_GPIO_WritePin(GPIOA, CS_PIN, 1);
HAL_GPIO_WritePin(GPIOA, DC_PIN, 1);
HAL_GPIO_WritePin(GPIOA, CS_PIN, 0);
uint8_t buf[127];
const uint8_t *p = pixels;
const uint16_t p_start = 896;
uint32_t p_count = 1280 * progress / 1000;
if(p_count > 128) p_count = 128;
if(p_count < 0) p_count = 0;
bool last_line = false;
uint16_t offset = 0;
while(1) {
uint8_t hdr = *(p++);
if(hdr == 0) break;
uint8_t len = hdr & 0x7f;
if(hdr & 0x80) {
// random bytes follow
memcpy(buf, p, len);
p += len;
} else {
// repeat same byte
memset(buf, *p, len);
p++;
}
if(!last_line && (offset+len) >= p_start) {
last_line = true;
// adjust so we're aligned w/ last line
int h = p_start - offset;
if(h) {
write_bytes(h, buf);
memmove(buf, buf+h, len-h);
len -= h;
offset += h;
}
}
if(last_line) {
for(int j=0; (p_count > 0) && (j<len); j++, p_count--) {
buf[j] |= 0x80;
}
}
write_bytes(len, buf);
offset += len;
}
HAL_GPIO_WritePin(GPIOA, CS_PIN, 1);
}
#if 0
// oled_busy_bar()
//
void
oled_busy_bar(bool en)
{
// Render a continuous activity (not progress) bar in lower 8 lines of display
// - using OLED itself to do the animation, so smooth and CPU free
// - cannot preserve bottom 8 lines, since we have to destructively write there
oled_spi_setup();
static const uint8_t setup[] = {
//0x20, 0x00, // horz addr-ing mode (normal)
0x21, 0x00, 0x7f, // setup column address range (start, end): 0-127
0x22, 7, 7, // setup page start/end address: page 7=last 8 lines
};
static const uint8_t animate[] = {
0x2e, // stop animations in progress
0x26, // scroll leftwards (stock ticker mode)
0, // placeholder
7, // start 'page' (vertical)
7, // scroll speed: 7=fastest,
7, // end 'page'
0, 0xff, // placeholders
0x2f // start
};
static const uint8_t cleanup[] = {
0x2e, // stop animation
0x20, 0x00, // horz addr-ing mode
0x21, 0x00, 0x7f, // setup column address range (start, end): 0-127
0x22, 7, 7, // setup page start/end address: page 7=last 8 lines
};
uint8_t data[128];
if(!en) {
// clear it, stop animation
memset(data, 0, sizeof(data));
oled_write_cmd_sequence(sizeof(cleanup), cleanup);
oled_write_data(sizeof(data), data);
return;
}
// some diagonal lines
for(int x=0; x<128; x++) {
// each byte here is a vertical column, 8 pixels tall, MSB at bottom
switch(x % 4) {
default:
data[x] = 0x0;
break;
case 0 ... 1:
data[x] = 0x80;
break;
}
}
oled_write_cmd_sequence(sizeof(setup), setup);
oled_write_data(sizeof(data), data);
oled_write_cmd_sequence(sizeof(animate), animate);
}
// oled_draw_bar()
//
void
oled_draw_bar(int percent)
{
// Render a continuous activity (progress) bar in lower 8 lines of display
// - cannot preserve bottom 8 lines, since we have to destructively write there
// - requires OLED and GPIO's already setup by other code.
oled_spi_setup();
static const uint8_t setup[] = {
0x21, 0x00, 0x7f, // setup column address range (start, end): 0-127
0x22, 7, 7, // setup page start/end address: page 7=last 8 lines
};
uint8_t data[128];
int cut = percent * 128 / 100;
// each byte here is a vertical column, 8 pixels tall, MSB at bottom
memset(data, 0x80, cut);
memset(data+cut, 0x0, 128-cut);
oled_write_cmd_sequence(sizeof(setup), setup);
oled_write_data(sizeof(data), data);
}
#endif
// oled_factory_busy()
//
void
oled_factory_busy(void)
{
// Render a continuous activity (not progress) bar in lower 8 lines of display
// - using OLED itself to do the animation, so smooth and CPU free
// - cannot preserve bottom 8 lines, since we have to destructively write there
//oled_spi_setup();
static const uint8_t setup[] = {
0x21, 0x00, 0x7f, // setup column address range (start, end): 0-127
0x22, 7, 7, // setup page start/end address: page 7=last 8 lines
};
static const uint8_t animate[] = {
0x2e, // stop animations in progress
0x26, // scroll leftwards (stock ticker mode)
0, // placeholder
7, // start 'page' (vertical)
7, // scroll speed: 7=fastest,
7, // end 'page'
0, 0xff, // placeholders
0x2f // start
};
uint8_t data[128];
for(int x=0; x<128; x++) {
// each byte here is a vertical column, 8 pixels tall, MSB at bottom
data[x] = (1<<(7 - (x%8)));
}
oled_write_cmd_sequence(sizeof(setup), setup);
oled_write_data(sizeof(data), data);
oled_write_cmd_sequence(sizeof(animate), animate);
}
// EOF