Joseph Bradshaw
mbed serial interface for the OV528 camera (uCAM TTL 120 from 4D systems).
Dependents: mbed_uCAM_TTL120_20141118
Library for interfacing the mbed to the OV528 jpeg engine camera from Omnivision. I tested this program using the uCAM TTL 120 from 4D systems, now obsolete.
Above is a saved jpeg image from the camera at 480x640 resolution
Camera and TFT screen setup
Closeup of the TFT screen displaying a 60x80 pixel 16 bit color bitmap image. The RGB (565) pixel colors were reversed when read from the camera relative to the TFT screen so a bit mask and shift had to be applied when displaying the pixel color.
bit mask and shift
int k=12;
for(int i=0;i<60;i++){
for(int j=0;j<80;j++){
//returned 16-bit color is 565(RGB)
pixel_col = (imageData[k] << 8);
k++;
pixel_col += imageData[k];
k++;
// fputc(((picture[k] >> 8) & 0xff), fp); //write pixel high byte to file
// fputc(picture[k] & 0xff, fp); //write low byte
//swap R and B bits in returned pixel for TFT display
int TFT_pix_col = 0;
TFT_pix_col += (pixel_col & 0x001f) << 11;
TFT_pix_col += (pixel_col & 0xf800) >> 11;
TFT_pix_col += (pixel_col & 0x07e0);
TFT.pixel(j, i, TFT_pix_col); //Do something with the pixel
}
}
Diff: uCAM_TTL120.cpp
- Revision:
- 2:f80257456c6e
- Parent:
- 0:fcc0eaeeb35c
- Child:
- 3:85db6ea8c0a4
--- a/uCAM_TTL120.cpp Tue Nov 18 17:55:06 2014 +0000
+++ b/uCAM_TTL120.cpp Tue Nov 18 20:26:06 2014 +0000
@@ -12,25 +12,6 @@
timerCam->start();
}
-/*
-int uCAM_TTL120::uCAM_read(char *str, int numchars, float timeout){
- int i = 0;
-
- float t_stop = timerCam->read()+timeout;
-
- while(i < numchars){
- if(_cam.readable()){
- str[i] = _cam.getc();
- i++;
- }
- if(timerCam->read() > t_stop)
- return i;
- }
-
- return i;
-}
-*/
-
int uCAM_TTL120::uCAM_read(char *str, int numchars, float timeout){
int i = 0;
float t_start = timerCam->read();
@@ -61,24 +42,24 @@
_cam.putc(p4);
}
-int uCAM_TTL120::uCAM_GetACK(void)
+int uCAM_TTL120::uCAM_GetACK(int command)
{
char ser_read[7];
- int i;
+ int i;
- for(i=0;i<7;i++) //clear the string
+ for(i=0;i<7;i++) //clear the string
ser_read[i] = 0;
- wait(.2);
+ wait(.1);
- //read serial buffer and wait for ACK (0xAA0E0DXX0000)
- uCAM_read(ser_read, 6, .1);
- if((ser_read[0] == 0xAA) &&
- (ser_read[1] == 0x0E))
- {
+ //read serial buffer and wait for ACK (0xAA0E0DXX0000)
+ uCAM_read(ser_read, 6, .1);
+ if((ser_read[0] == 0xAA) &&
+ (ser_read[1] == 0x0E)){
+ if((command & 0xff) == ser_read[2])
return 1;
- }
- else
+ }
+ else
return 0;
}
@@ -109,7 +90,8 @@
(ser_read[4] == 0x00))
{
//after receiving ACK, wait for SYNC (0xAA0D00000000)
- uCAM_read(ser_read, 6, 100);
+ uCAM_read(ser_read, 6, .100);
+
if((ser_read[0] == 0xAA) &&
(ser_read[1] == 0x0D) &&
(ser_read[2] == 0x00) &&
@@ -121,7 +103,7 @@
uCAM_Command_Send(uCAM_ACK,0x0D,0x00,0x00,0x00);
printf("\r\n uCAM 120 Initialized\r\nDelaying 2 seconds for AGC and AEC \r\n circuits to stabilise before image capture.");
- wait(.5); //2 second delay before capturing first image
+/* wait(.5); //2 second delay before capturing first image
printf(".");
wait(.5);
printf(".");
@@ -129,7 +111,7 @@
printf(".");
wait(.5);
printf(".\r\nFinished\r\n");
-
+*/
return 1; //Camera connection successful
}
}
@@ -218,14 +200,14 @@
}
int uCAM_TTL120::uCAM_send_SNAPSHOT(void)
{
- uCAM_Command_Send(uCAM_SNAPSHOT,0x01,0x00,0x00,0x00); // p1=0x01-Uncompressed Image
- // p2 and p3 = 0, current frame
- wait(.05);
+ uCAM_Command_Send(uCAM_SNAPSHOT,0x01,0x00,0x00,0x00); // p1=0x01-Uncompressed Image
+ // p2 and p3 = 0, current frame
+ wait(.05);
- if(uCAM_GetACK())
+ if(uCAM_GetACK(uCAM_SNAPSHOT))
return 1;
- else
- return 0;
+ else
+ return 0;
}
int uCAM_TTL120::uCAM_send_GET_PICTURE_80x60_16COL_RAW(void)
@@ -514,10 +496,19 @@
void uCAM_TTL120::uCAM_set_baud(void)
{
- /*uCAM_Command_Send(uCAM_SET_BAUD_RATE,0x03,0x00,0x00,0x00); // set baud to
- serCopen(921600);*/
- uCAM_Command_Send(uCAM_SET_BAUD_RATE,0x02,0x00,0x00,0x00); // set baud to
- _cam.baud(1228800);
+ uCAM_Command_Send(uCAM_SET_BAUD_RATE,0x03,0x00,0x00,0x00); // set baud to
+ wait(.05);
+
+ if(uCAM_GetACK(uCAM_SET_BAUD_RATE)){
+ printf("Baud rate sucessfully changed");
+ }
+ else{
+ printf("Baud rate NOT sucessfully changed");
+ }
+
+ _cam.baud(921600);
+// uCAM_Command_Send(uCAM_SET_BAUD_RATE,0x02,0x00,0x00,0x00); // set baud to
+// _cam.baud(1228800);
}
void uCAM_TTL120::uCAM_TakePic_RAW_16COLOR_80x60(void)
@@ -561,3 +552,121 @@
char c = _cam.getc();
}
}
+
+int uCAM_TTL120::uCAM_get_jpeg(FILE *fileName){
+
+ char ser_read[7];
+ unsigned long pic_bytes;
+
+ uCAM_FlushBuffer();
+ uCAM_Command_Send(uCAM_INITIAL,0x00,0x07,0x07,0x07); // JPEG,640 x 480,JPEG
+ //cam.uCAM_Command_Send(uCAM_INITIAL,0x00,0x07,0x07,0x03); // JPEG,160 x 120,JPEG
+ wait(.05);
+
+ if(uCAM_GetACK(uCAM_INITIAL)){ //INITIAL ACK
+ printf("ACK received on uCAM_INITIAL\r\n");
+ }
+ else{
+ printf("Did not receive ACK on uCAM_INITIAL\r\n");
+ }
+
+ uCAM_FlushBuffer();
+ uCAM_Command_Send(uCAM_SET_PACKAGE_SIZE,0x08,0x00,0x02,0x00); //512 bytes
+
+ wait(.05);
+
+ if(uCAM_GetACK(uCAM_SET_PACKAGE_SIZE)){ //SET PACKAGE SIZE ACK
+ printf("ACK received on uCAM_SET_PACKAGE_SIZE\r\n");
+ }
+ else{
+ printf("Did not receive ACK on SET PACKAGE SIZE\r\n");
+ }
+
+ uCAM_FlushBuffer();
+ uCAM_Command_Send(uCAM_SNAPSHOT,0x00,0x00,0x00,0x00); //JPEG
+
+ if(uCAM_GetACK(uCAM_SNAPSHOT)){ //uCAM_SNAPSHOT ACK
+ printf("ACK received on uCAM_SNAPSHOT\r\n");
+ }
+ else{
+ printf("Did not receive ACK on uCAM_SNAPSHOT\r\n");
+ }
+
+ pic_bytes = 0;
+
+ uCAM_FlushBuffer();
+ uCAM_Command_Send(uCAM_GET_PICTURE,0x01,0x00,0x00,0x00); // p1=0x01-Snapshot picture
+ wait(.1);
+
+ if(uCAM_GetACK(uCAM_GET_PICTURE)) //returned get pic
+ {
+ //read serial buffer and wait for ACK (0xAA0E0DXX0000)
+ uCAM_read(ser_read, 6, 1);
+
+ if((ser_read[0] == 0xAA) && //first 2 bytes indicate it was a DATA packet
+ (ser_read[1] == 0x0A) &&
+ (ser_read[2] == 0x01)) //DATA from snapshot ACK
+ {
+ pic_bytes = (unsigned long)ser_read[3];
+ pic_bytes += (unsigned long)ser_read[4] << 8;
+ pic_bytes += (unsigned long)ser_read[5] << 16;
+
+ int packID=0;
+ char packID_l, packID_h;
+
+ // pc.printf("\r\n");
+ int numPackages = pic_bytes / (512 - 6);
+
+ while(numPackages>=0){
+ packID_h = (packID >> 8) & 0xff;
+ packID_l = packID & 0xff;
+
+ uCAM_FlushBuffer();
+ uCAM_Command_Send(uCAM_ACK, 0x00, 0x00, packID_l, packID_h);
+
+ char ID_ret[2];
+ uCAM_read(ID_ret, 2, .2);
+
+ char dataSize[2];
+ uCAM_read(dataSize, 2, .2);
+
+ char imageData[506]; //512 - 6
+ int imageDataSize = ((dataSize[1] & 0xff) << 8) + (dataSize[0] & 0xff);
+
+ //uCAM_read(imageData, imageDataSize, .2);
+ for(int i=0;i<imageDataSize;i++)
+ imageData[i] = _cam.getc();
+
+ char verifyCode[2];
+ uCAM_read(verifyCode, 2, .2);
+
+ int vCodeCheck=0;
+ vCodeCheck += ID_ret[0];
+ vCodeCheck += ID_ret[1];
+ vCodeCheck += dataSize[0];
+ vCodeCheck += dataSize[1];
+
+ for(int i=0;i<imageDataSize;i++)
+ vCodeCheck += imageData[i];
+
+ if((verifyCode[0] & 0xff) == (vCodeCheck & 0xff)){
+ //pc.printf("\r\nPack ID = %d\r\n", packID);//debugging
+ for(int j=0;j<imageDataSize;j++){
+ fputc(imageData[j], fileName);
+ //pc.printf("%2X ", imageData[j]);
+ }
+
+ packID++;
+ numPackages--;
+ }
+ else{
+ printf("\r\nBad Data in transfer. ReTransfer\r\n");
+ return -2;
+ }
+ }
+ uCAM_Command_Send(uCAM_ACK, 0x00, 0x00, 0xf0, 0xf0);
+ return 0; //return 0 on success
+ }
+ }//data packet
+ return -1;
+} //function