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/*
* GraphLCD driver library
*
* usbserlcd.c - USBserLCD driver class
*
* This file is released under the GNU General Public License. Refer
* to the COPYING file distributed with this package.
*
* (c) 2017 Manuel Reimer <manuel.reimer@gmx.de>
*/
#include <syslog.h>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include "common.h"
#include "config.h"
#include "port.h"
#include "usbserlcd.h"
#include "stdint.h"
const int BAUD_RATE = 150000;
const int BOOT_TIME = 300000;
// Possible serial package types
enum glcd_pkgtype: char {
PKGTYPE_DATA,
PKGTYPE_BRIGHTNESS
};
namespace GLCD
{
cDriverUSBserLCD::cDriverUSBserLCD(cDriverConfig * config)
: cDriver(config)
{
port = new cSerialPort();
refreshCounter = 0;
FS = 8;
brightness = 255;
}
cDriverUSBserLCD::~cDriverUSBserLCD()
{
delete port;
}
int cDriverUSBserLCD::Init()
{
width = config->width;
if (width <= 0)
width = 240;
height = config->height;
if (height <= 0)
height = 128;
// setup lcd array (wanted state)
newLCD = new unsigned char*[(width + (FS - 1)) / FS];
if (newLCD)
{
for (int x = 0; x < (width + (FS - 1)) / FS; x++)
{
newLCD[x] = new unsigned char[height];
memset(newLCD[x], 0, height);
}
}
// setup lcd array (current state)
oldLCD = new unsigned char*[(width + (FS - 1)) / FS];
if (oldLCD)
{
for (int x = 0; x < (width + (FS - 1)) / FS; x++)
{
oldLCD[x] = new unsigned char[height];
memset(oldLCD[x], 0, height);
}
}
if (config->device == "")
return -1;
if (port->Open(config->device.c_str()) != 0)
return -1;
port->SetBaudRate(BAUD_RATE);
*oldConfig = *config;
// clear display
Clear();
// Disable the "hangup" signal to prevent Arduino reboots on connect.
// We can't catch the first reboot with this (Hangup flag was set).
// In this case, wait some milliseconds and do a full refresh.
if (port->DisableHangup()) {
usleep(BOOT_TIME);
Refresh(true);
}
syslog(LOG_INFO, "%s: USBserLCD initialized.\n", config->name.c_str());
return 0;
}
int cDriverUSBserLCD::DeInit()
{
int x;
// free lcd array (wanted state)
if (newLCD)
{
for (x = 0; x < (width + (FS - 1)) / FS; x++)
{
delete[] newLCD[x];
}
delete[] newLCD;
}
// free lcd array (current state)
if (oldLCD)
{
for (x = 0; x < (width + (FS - 1)) / FS; x++)
{
delete[] oldLCD[x];
}
delete[] oldLCD;
}
if (port->Close() != 0)
return -1;
return 0;
}
int cDriverUSBserLCD::CheckSetup()
{
if (config->device != oldConfig->device ||
config->width != oldConfig->width ||
config->height != oldConfig->height)
{
DeInit();
Init();
return 0;
}
if (config->upsideDown != oldConfig->upsideDown ||
config->invert != oldConfig->invert)
{
oldConfig->upsideDown = config->upsideDown;
oldConfig->invert = config->invert;
return 1;
}
return 0;
}
void cDriverUSBserLCD::Clear()
{
for (int x = 0; x < (width + (FS - 1)) / FS; x++)
memset(newLCD[x], 0, height);
}
void cDriverUSBserLCD::SetPixel(int x, int y, uint32_t data)
{
if (x >= width || y >= height)
return;
int pos = x % 8;
if (config->upsideDown)
{
x = width - 1 - x;
y = height - 1 - y;
} else {
pos = 7 - pos; // reverse bit position
}
if (data == GRAPHLCD_White)
newLCD[x / 8][y] |= (1 << pos);
else
newLCD[x / 8][y] &= ( 0xFF ^ (1 << pos) );
}
void cDriverUSBserLCD::Refresh(bool refreshAll)
{
int x,y;
uint16_t addr = 0;
if (CheckSetup() == 1)
refreshAll = true;
if (config->refreshDisplay > 0)
{
refreshCounter = (refreshCounter + 1) % config->refreshDisplay;
if (!refreshAll && !refreshCounter)
refreshAll = true;
}
// draw all
cDriverUSBserLCDBuffer full_seq(8500);
std::string bytes = "";
bytes.reserve(8500);
for (y = 0; y < height; y++)
{
for (x = 0; x < (width + (FS - 1)) / FS; x++)
{
char byte = (newLCD[x][y]) ^ (config->invert ? 0xff : 0x00);
bytes.append(&byte, 1);
if (refreshAll)
oldLCD[x][y] = newLCD[x][y];
}
}
full_seq.Append(bytes, 0);
if (refreshAll) {
port->WriteData(full_seq.GetString());
// and reset RefreshCounter
refreshCounter = 0;
return;
}
// draw only the changed bytes
cDriverUSBserLCDBuffer part_seq(8500);
bool cs = false;
bytes = "";
for (y = 0; y < height; y++)
{
for (x = 0; x < (width + (FS - 1)) / FS; x++)
{
if (oldLCD[x][y] != newLCD[x][y])
{
if (!cs)
{
if (width % FS == 0)
addr = (y * (width / FS)) + x;
else
addr = (y * (width / FS + 1)) + x;
bytes = "";
cs = true;
}
char byte = (newLCD[x][y]) ^ (config->invert ? 0xff : 0x00);
bytes.append(&byte, 1);
oldLCD[x][y] = newLCD[x][y];
}
else if (bytes != "")
{
part_seq.Append(bytes, addr);
cs = false;
bytes = "";
}
}
}
if (bytes != "")
part_seq.Append(bytes, addr);
// Send the smaller data block.
if (part_seq.GetLength() < full_seq.GetLength())
port->WriteData(part_seq.GetString());
else
port->WriteData(full_seq.GetString());
}
void cDriverUSBserLCD::SetBrightness(unsigned int percent)
{
unsigned char brightness = 255 * percent / 100;
std::string pkg = "GLCD";
pkg += PKGTYPE_BRIGHTNESS;
pkg += brightness;
port->WriteData(pkg);
}
cDriverUSBserLCDBuffer::cDriverUSBserLCDBuffer(int aExpectedBytes)
{
buffer = "";
buffer.reserve(aExpectedBytes);
}
void cDriverUSBserLCDBuffer::Append(std::string aBytes, uint16_t aAddress)
{
buffer += "GLCD";
buffer += PKGTYPE_DATA;
buffer.append((char*)&aAddress, 2);
uint16_t len = aBytes.length();
buffer.append((char*)&len, 2);
buffer.append(aBytes);
}
int cDriverUSBserLCDBuffer::GetLength() const
{
return buffer.length();
}
std::string cDriverUSBserLCDBuffer::GetString() const
{
return buffer;
}
} // end of namespace
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