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main.cpp
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main.cpp
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// PD-Camera project by Tom Granger
// Highly experimental, use at your own risk :)
#include <Arduino.h>
#include <EEPROM.h>
#include <Dither.h>
#include <OV7670.h>
#include <SD.h>
#include "USBHost_t36.h"
// Adds a ton of debug info to the Teensy's serial
// including a mirror of the Playdate's serial output.
// #define DEBUG 1
#ifdef DEBUG
#define DEBUG_PRINT(x) Serial.println(x)
#else
#define DEBUG_PRINT(x)
#endif
const int ledpin = 13;
const char *PLAYDATE_PRODUCT_NAME = "Playdate";
const unsigned int MAX_INPUT = 80;
elapsedMillis sinceLastMessage;
uint32_t baud = 115200;
USBHost myusb;
USBHub hub1(myusb);
USBSerial_BigBuffer userial(myusb, 1);
USBDriver *drivers[] = {&hub1, &userial};
#define CNT_DEVICES (sizeof(drivers) / sizeof(drivers[0]))
const char *driver_names[CNT_DEVICES] = {"Hub1", "USERIAL1"};
bool driver_active[CNT_DEVICES] = {false, false};
// Put all the buffers in DMAMEM
uint8_t fcaptbuff[320l * 240l * 2] DMAMEM;
uint8_t cbuff1[320l * 240l * 2] DMAMEM;
uint8_t cbuff2[320l * 240l * 2] DMAMEM;
Dither image(320, 240);
const char compileTime[] = " Compiled on " __DATE__ " " __TIME__;
#define LEDON digitalWriteFast(ledpin, HIGH); // Also marks IRQ handler timing
#define LEDOFF digitalWriteFast(ledpin, LOW);
void blinkN(int times)
{
for (int i = 0; i < times; i++)
{
delay(200);
LEDON;
delay(200);
LEDOFF;
}
}
void blinkForever(void)
{
while (1)
{
blinkN(1);
}
}
const int pinCamReset = 14;
// Dither library overrides
#define fastEDDither_remove_artifacts true
#define _size 4
enum CameraStatus {
INITIALIZING,
AWAITING_CONNECTION,
CONNECTED,
FRAME_REQUESTED,
SENDING_FRAME,
};
CameraStatus status = INITIALIZING;
enum DitherType
{
STUCKI,
ATKINSON,
FS,
FAST,
BAYER,
RNDM,
THRESHOLD
};
DitherType currDitherType = STUCKI;
uint8_t thresh = 128;
/*
These are the 2 Lua functions sent by the Teensy via eval command.
See https://github.com/t0mg/pd-camera-hardware/lua/readme.md for details.
*/
static const int statusCharIndex = 87;
static const int evalStatusCodeLength = 107;
static const byte evalStatusCode[evalStatusCodeLength] PROGMEM = {
27, 76, 117, 97, 84, 0, 25, 147, 13, 10, 26, 10, 4, 4, 4, 120,
86, 0, 0, 0, 64, 185, 67, 1, 147, 64, 112, 114, 111, 99, 101, 115,
115, 83, 116, 97, 116, 117, 115, 46, 108, 117, 97, 128, 128, 0, 1, 2,
133, 79, 0, 0, 0, 9, 0, 0, 0, 131, 128, 0, 0, 66, 0, 2,
1, 68, 0, 1, 1, 130, 4, 142, 95, 99, 97, 109, 101, 114, 97, 83,
116, 97, 116, 117, 115, 4, 130, 49, 129, 1, 0, 0, 128, 133, 1, 0,
0, 0, 0, 128, 128, 129, 133, 95, 69, 78, 86};
enum StatusCode
{
INIT = 48, // 0 in ASCII
READY = 49, // 1
STREAMING = 50, // 2
OK = 51, // 3
ERROR = 52 // 4
};
void sendStatusCode(StatusCode code)
{
byte statusMessage[evalStatusCodeLength];
memcpy(statusMessage, evalStatusCode, evalStatusCodeLength);
statusMessage[statusCharIndex] = code;
userial.flush();
userial.println("eval 107");
userial.write(statusMessage, evalStatusCodeLength);
sinceLastMessage = 0;
}
static const int headerLength = 86;
static const byte evalPayloadHeader[headerLength] PROGMEM = {
27, 76, 117, 97, 84, 0, 25, 147, 13, 10, 26, 10, 4, 4, 4, 120,
86, 0, 0, 0, 64, 185, 67, 1, 146, 64, 112, 114, 111, 99, 101, 115,
115, 73, 109, 97, 103, 101, 46, 108, 117, 97, 128, 128, 0, 1, 2, 133,
79, 0, 0, 0, 9, 0, 0, 0, 131, 128, 0, 0, 66, 0, 2, 1,
68, 0, 1, 1, 130, 4, 141, 95, 99, 97, 109, 101, 114, 97, 73, 109,
97, 103, 101, 20, 75, 129}; // for 320x240 (QVGA) image
// 93, 225}; for 400x240 image
static const int footerLength = 19;
static const byte evalPayloadFooter[footerLength] PROGMEM = {
129, 1, 0, 0, 128, 133, 1, 0, 0, 0,
0, 128, 128, 129, 133, 95, 69, 78, 86};
static const int imageWidth = 320;
static const int imageHeight = 240;
static const int packedImageLength = imageWidth * imageHeight / 8;
static const int payloadLength = headerLength + packedImageLength + footerLength;
char evalCommand[12];
void processImage(void)
{
if (status != FRAME_REQUESTED) {
return;
}
status = SENDING_FRAME;
uint32_t imagesize = OV7670.ImageSize();
OV7670.ClearFrameReady();
// wait until cbuff2 is ready
while (OV7670.FrameReady() != 2)
{
}
// pack Y values at the first half of the buffer
for (uint32_t i = 0u; i < imagesize / 2; i++)
{
fcaptbuff[i] = cbuff2[2 * i];
}
// apply dithering to the first half of the buffer
switch (currDitherType)
{
case STUCKI:
image.StuckiDither(fcaptbuff);
break;
case ATKINSON:
image.AtkinsonDither(fcaptbuff);
break;
case FS:
image.FSDither(fcaptbuff);
break;
case FAST:
image.fastEDDither(fcaptbuff);
break;
case BAYER:
image.patternDither(fcaptbuff);
break;
case RNDM:
image.randomDither(fcaptbuff, false);
break;
default:
image.thresholding(fcaptbuff, thresh);
break;
}
// pack the image as 1bit in a new byte array
byte payload[payloadLength];
memcpy(payload, evalPayloadHeader, headerLength);
memcpy(&payload[headerLength + packedImageLength], evalPayloadFooter, footerLength);
int byteIndex = headerLength;
int pixelIndex = 0;
int bufferIndex = 0;
while (byteIndex < headerLength + packedImageLength)
{
byte currentByte = 0;
for (int n = 7; n >= 0; n--)
{
uint8_t val = fcaptbuff[bufferIndex++];
if (val == 0u)
{
// clear bit at byteindex
currentByte &= ~(1 << n);
}
else
{
// set bit at byteindex
currentByte |= (1 << n);
}
pixelIndex++;
pixelIndex = pixelIndex % imageWidth;
}
payload[byteIndex++] = currentByte;
}
if (status != SENDING_FRAME)
{
return;
}
userial.flush();
userial.println(evalCommand);
userial.write(payload, payloadLength);
sinceLastMessage = 0;
status = CONNECTED;
}
void processUpdatedDeviceListInfo()
{
for (uint8_t i = 0; i < CNT_DEVICES; i++)
{
if (*drivers[i] != driver_active[i])
{
if (driver_active[i])
{
#ifdef DEBUG
Serial.printf("*** Device %s - disconnected ***\n", driver_names[i]);
#endif
driver_active[i] = false;
if (strcmp(driver_names[i], "USERIAL1") == 0)
{
status = INITIALIZING;
blinkN(3);
// sendStatusCode(INIT);
// userial.end();
}
}
else
{
driver_active[i] = true;
const uint8_t *product = drivers[i]->product();
#ifdef DEBUG
Serial.printf("*** Device %s %x:%x - connected ***\n", driver_names[i], drivers[i]->idVendor(), drivers[i]->idProduct());
const uint8_t *psz = drivers[i]->manufacturer();
if (psz && *psz)
Serial.printf(" manufacturer: %s\n", psz);
if (product && *product)
Serial.printf(" product: %s\n", product);
psz = drivers[i]->serialNumber();
if (psz && *psz)
Serial.printf(" Serial: %s\n", psz);
#endif
// If this is a new Serial device.
if (drivers[i] == &userial) //&& strcmp((const char *)product, PLAYDATE_PRODUCT_NAME) == 0)
{
DEBUG_PRINT("\nConnected to Playdate Serial, yay!");
blinkN(1);
status = AWAITING_CONNECTION;
userial.begin(baud);
}
}
}
}
}
bool prefix(const char *pre, const char *str)
{
return strncmp(pre, str, strlen(pre)) == 0;
}
const char *dataWithPrefix(const char *prefix, const char *string)
{
int prefix_length = strlen(prefix);
int string_length = strlen(string);
if (prefix_length > string_length)
{
return NULL;
}
for (int i = 0; i < prefix_length; i++)
{
if (string[i] != prefix[i])
{
return NULL;
}
}
return string + prefix_length;
}
void process_data(const char *data)
{
#ifdef DEBUG
Serial.print("[Playdate] ");
Serial.println(data);
#endif
// Early exit if this is not a Camera command message.
if (!prefix("Camera:", data))
{
return;
}
sinceLastMessage = 0;
// Basic Camera commands.
if (strcmp(data, "Camera:connect") == 0)
{
// if (status == AWAITING_CONNECTION)
// {
sendStatusCode(READY);
status = CONNECTED;
// }
return;
}
else if (strcmp(data, "Camera:readyForNextFrame") == 0)
{
sendStatusCode(STREAMING);
status = FRAME_REQUESTED;
return;
}
else if (strcmp(data, "Camera:disconnect") == 0)
{
status = AWAITING_CONNECTION;
return;
}
// Dithering mode setting.
const char *ditherMode = dataWithPrefix("Camera:dither:", data);
if (ditherMode != NULL)
{
if (strcmp(ditherMode, "stucki") == 0)
{
DEBUG_PRINT("Switching to Stucki dithering");
currDitherType = STUCKI;
// sendStatusCode(OK);
}
else if (strcmp(ditherMode, "atkinson") == 0)
{
DEBUG_PRINT("Switching to Atkinson dithering");
currDitherType = ATKINSON;
// sendStatusCode(OK);
}
else if (strcmp(ditherMode, "fs") == 0)
{
DEBUG_PRINT("Switching to Floyd-Steinberg dithering");
currDitherType = FS;
// sendStatusCode(OK);
}
else if (strcmp(ditherMode, "fast") == 0)
{
DEBUG_PRINT("Switching to Fast Error Diffusion dithering");
currDitherType = FAST;
// sendStatusCode(OK);
}
else if (strcmp(ditherMode, "random") == 0)
{
DEBUG_PRINT("Switching to random dithering");
currDitherType = RNDM;
// sendStatusCode(OK);
}
else if (strcmp(ditherMode, "bayer") == 0)
{
DEBUG_PRINT("Switching to bayer patterned dithering");
currDitherType = BAYER;
// sendStatusCode(OK);
}
else if (strcmp(ditherMode, "threshold") == 0)
{
DEBUG_PRINT("Switching to thresholding");
currDitherType = THRESHOLD;
// sendStatusCode(OK);
}
else
{
DEBUG_PRINT("Unknown dither mode requested");
sendStatusCode(ERROR);
}
return;
}
// Contrast setting.
const char *constrastStr = dataWithPrefix("Camera:contrast:", data);
if (constrastStr != NULL)
{
int contrastValue = atoi(constrastStr);
if (contrastValue > 0 && contrastValue < 256)
{
OV7670.SetContrast(contrastValue);
// sendStatusCode(OK);
return;
}
sendStatusCode(ERROR);
return;
}
// Brightness setting.
const char *brightnessStr = dataWithPrefix("Camera:brightness:", data);
if (brightnessStr != NULL)
{
int brightnessValue = atoi(brightnessStr);
if (brightnessValue > 0 && brightnessValue < 256)
{
OV7670.SetBrightness(brightnessValue);
// sendStatusCode(OK);
return;
}
sendStatusCode(ERROR);
return;
}
// Threshold setting.
const char *thresholdStr = dataWithPrefix("Camera:threshold:", data);
if (thresholdStr != NULL)
{
int thresholdValue = atoi(thresholdStr);
if (thresholdValue > 0 && thresholdValue < 256)
{
thresh = thresholdValue;
// sendStatusCode(OK);
return;
}
sendStatusCode(ERROR);
return;
}
// Mirror (selfie mode) setting.
const char *mirrorStr = dataWithPrefix("Camera:mirror:", data);
if (mirrorStr != NULL)
{
int mirrorValue = atoi(mirrorStr);
if (mirrorValue == 1 || mirrorValue == 0)
{
OV7670.WriteRegister(REG_MVFP, MVFP_FLIP + MVFP_MIRROR * abs(mirrorValue - 1));
// sendStatusCode(OK);
return;
}
sendStatusCode(ERROR);
return;
}
}
// from http://www.gammon.com.au/serial
void processIncomingByte(const byte inByte)
{
static char inputLine[MAX_INPUT];
static unsigned int inputPos = 0;
switch (inByte)
{
case '\n': // end of text
inputLine[inputPos] = 0; // terminating null byte
// terminator reached! process inputLine here ...
process_data(inputLine);
// reset buffer for next time
inputPos = 0;
break;
case '\r': // discard carriage return
break;
default:
// keep adding if not full ... allow for terminating null byte
if (inputPos < (MAX_INPUT - 1))
inputLine[inputPos++] = inByte;
break;
} // end of switch
} // end of processIncomingByte
void setup()
{
sprintf(evalCommand, "eval %d", payloadLength);
image.buildBayerPattern();
myusb.begin();
Serial.begin(115200);
delay(200);
Wire.begin();
pinMode(pinCamReset, OUTPUT);
pinMode(ledpin, OUTPUT);
digitalWriteFast(pinCamReset, LOW);
delay(10);
digitalWriteFast(pinCamReset, HIGH); // subsequent resets via SCB
#ifdef DEBUG
// while (!Serial)
// ; // wait for Arduino Serial Monitor
Serial.printf("\n\nPlaydate Camera adapter %s\n", compileTime);
#endif
if (OV7670.begin(QVGA, cbuff1, cbuff2))
{
OV7670.SetOutMode(YUV422);
OV7670.WriteRegister(REG_TSLB, 1 << 4);
OV7670.WriteRegister(0x67, 0);
OV7670.WriteRegister(0x68, 0);
OV7670.WriteRegister(REG_MVFP, MVFP_FLIP + MVFP_MIRROR);
OV7670.ShowCamConfig();
OV7670.ShowCSIRegisters();
#ifdef DEBUG
Serial.println("OV7670 camera initialized.");
Serial.printf("cbuff1 at %p\n", cbuff1);
Serial.printf("cbuff2 at %p\n", cbuff2);
Serial.printf("fcaptbuff at %p\n", fcaptbuff);
#endif
}
else
{
#ifdef DEBUG
Serial.println("Error initializing OV7670");
#endif
blinkForever();
}
#ifdef DEBUG
OV7670.ShowCamConfig();
#endif
LEDOFF
}
void loop()
{
myusb.Task();
processUpdatedDeviceListInfo();
// Send requested image to the Camera app.
if (status == FRAME_REQUESTED)
{
processImage();
}
// Let the Camera app know we're ready to send bytes.
else if (sinceLastMessage >= 1000 && status != CONNECTED) {
sinceLastMessage = sinceLastMessage - 1000;
// sendStatusCode(READY);
}
// Monitor Playdate serial and process incoming messages.
if (status != INITIALIZING) {
while (userial.available() > 0)
processIncomingByte(userial.read());
}
}