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/*
* Copyright 2021 Daniel Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Driver for 4.2" Pervasive Aurora Mb (V230/V231) E-Paper displays with
* internal Timing Controller (iTC) connected to a Pervasive EPD Extension
* Board Gen 2 (EXT2)-02. Configured for the 300x400px 4.2" E-Paper variant;
* register contents and LUTs for other resolutions and revisions may differ.
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*/
#include "driver/pervasive_aurora_mb.h"
#include "driver/spi.h"
#include "driver/gpio.h"
#include "arch.h"
void PervasiveAuroraMb::setup()
{
gpio.output(PERVASIVE_AURORA_RESET_PIN, 0);
gpio.output(PERVASIVE_AURORA_CS_PIN, 0);
gpio.output(PERVASIVE_AURORA_DC_PIN, 0);
gpio.output(PERVASIVE_AURORA_VCC_PIN, 0);
gpio.input(PERVASIVE_AURORA_BUSY_PIN);
}
void PervasiveAuroraMb::powerOn()
{
gpio.write(PERVASIVE_AURORA_VCC_PIN, 1);
arch.delay_ms(5);
gpio.write(PERVASIVE_AURORA_RESET_PIN, 1);
arch.delay_ms(1);
gpio.write(PERVASIVE_AURORA_CS_PIN, 1);
}
void PervasiveAuroraMb::initialize(signed char temperature)
{
// "Input Temperature"
spiWrite(0xe5, (const unsigned char*)&temperature, 1);
// "Active Temperature"
spiWrite(0xe0, (const unsigned char[]){0x02}, 1);
// "Panel Settings"
spiWrite(0x00, (const unsigned char[]){0x0f}, 1);
// "Panel Settings"
spiWrite(0x00, (const unsigned char[]){0x0f}, 1);
// "Booster soft start settings"
spiWrite(0x06, (const unsigned char[]){0x17, 0x17, 0x27}, 3);
// "Resolution settings": 300 x 400 -> 0x12c x 0x190
spiWrite(0x61, (const unsigned char[]){0x01, 0x90, 0x01, 0x2c}, 4);
// "Vcom and data interval setting"
spiWrite(0x50, (const unsigned char[]){0x87}, 1);
// "Power Saving"
spiWrite(0xe3, (const unsigned char[]){0x88}, 1);
}
void PervasiveAuroraMb::sendImage(unsigned char *frame, unsigned int x, unsigned int y, unsigned int w, unsigned int h)
{
unsigned char null_int[2] = {0x00, 0x00};
spiWrite(0x10, 0, 0);
gpio.write(PERVASIVE_AURORA_CS_PIN, 0);
spi.xmit(300*(400/8), frame, 0, frame);
gpio.write(PERVASIVE_AURORA_CS_PIN, 1);
/*
* Second Pass: All zeroes (-> update entire display).
* A 1 bit indicates that the corresponding pixel should be skipped.
*/
spiWrite(0x13, 0, 0);
gpio.write(PERVASIVE_AURORA_CS_PIN, 0);
if (w == 0 || h == 0) {
for (unsigned int i = 0; i < 300*(400/16); i++) {
spi.xmit(2, null_int, 0, frame);
}
} else {
unsigned int y1_mod = y % 8;
unsigned int y2_mod = (y + h) % 8;
for (unsigned int x_pos = 0; x_pos < 300; x_pos++) {
for (unsigned int y_pos = 0; y_pos < 400/8; y_pos++) {
if (x_pos < x || x_pos >= x+w || y_pos < y/8 || y_pos > (y+h)/8) {
// outside of update area
null_int[0] = 0xff;
} else if (y/8 == (y+h)/8) {
null_int[0] = (0xff << y2_mod) | (0xff >> (8-y1_mod));
} else if (y_pos == y/8) {
null_int[0] = 0xff << y1_mod;
} else if (y_pos == (y+h)/8) {
null_int[0] = 0xff >> (8-y2_mod);
} else {
null_int[0] = 0x00;
}
spi.xmit(1, null_int, 0, frame);
}
}
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}
gpio.write(PERVASIVE_AURORA_CS_PIN, 1);
}
void PervasiveAuroraMb::sendUpdate()
{
while (isBusy()) ;
spiWrite(0x04, 0, 0);
while (isBusy()) ;
spiWrite(0x12, 0, 0);
while (isBusy()) ;
}
void PervasiveAuroraMb::powerOff()
{
spiWrite(0x02, 0, 0);
while (isBusy()) ;
gpio.output(PERVASIVE_AURORA_RESET_PIN, 0);
gpio.output(PERVASIVE_AURORA_CS_PIN, 0);
gpio.output(PERVASIVE_AURORA_DC_PIN, 0);
gpio.output(PERVASIVE_AURORA_VCC_PIN, 0);
}
bool PervasiveAuroraMb::isBusy()
{
return !gpio.read(PERVASIVE_AURORA_BUSY_PIN);
}
void PervasiveAuroraMb::spiWrite(unsigned char reg, const unsigned char *txbuf, unsigned int length)
{
gpio.write(PERVASIVE_AURORA_DC_PIN, 0);
gpio.write(PERVASIVE_AURORA_CS_PIN, 0);
spi.xmit(1, ®, 0, 0);
gpio.write(PERVASIVE_AURORA_CS_PIN, 1);
gpio.write(PERVASIVE_AURORA_DC_PIN, 1);
if (length) {
arch.delay_us(1);
gpio.write(PERVASIVE_AURORA_CS_PIN, 0);
spi.xmit(length, (unsigned char*)txbuf, 0, 0);
gpio.write(PERVASIVE_AURORA_CS_PIN, 1);
}
}
PervasiveAuroraMb pervasiveAuroraMb;