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:
- 0:fcc0eaeeb35c
- Child:
- 2:f80257456c6e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/uCAM_TTL120.cpp Mon Nov 17 21:03:43 2014 +0000
@@ -0,0 +1,563 @@
+// Library for uCAM-TTL120 from Saelig
+
+#include "uCAM_TTL120.h"
+#define __DEBUG
+
+//----------------- uCAM Functions ------------------------------
+
+uCAM_TTL120::uCAM_TTL120(PinName tx, PinName rx) : _cam(tx, rx) {
+ _cam.baud(115200); //Initial baud rate
+ timerCam = new Timer();
+
+ 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();
+
+ while((timerCam->read() < (t_start + timeout)) && (i < numchars)){
+ if(_cam.readable()){
+ str[i] = _cam.getc();
+ i++;
+ }
+ }
+ if(timerCam->read() >= (t_start + timeout)){
+ return -1;
+ }
+ if(i >= numchars){
+ return -2;
+ }
+
+ return i;
+}
+
+void uCAM_TTL120::uCAM_Command_Send(int command,char p1,char p2,char p3,char p4)
+{
+ _cam.putc((char)(command >> 8) & 0xff);
+ _cam.putc((char)(command & 0xff));
+ _cam.putc(p1);
+ _cam.putc(p2);
+ _cam.putc(p3);
+ _cam.putc(p4);
+}
+
+int uCAM_TTL120::uCAM_GetACK(void)
+{
+ char ser_read[7];
+ int i;
+
+ for(i=0;i<7;i++) //clear the string
+ ser_read[i] = 0;
+
+ wait(.2);
+
+ //read serial buffer and wait for ACK (0xAA0E0DXX0000)
+ uCAM_read(ser_read, 6, .1);
+ if((ser_read[0] == 0xAA) &&
+ (ser_read[1] == 0x0E))
+ {
+ return 1;
+ }
+ else
+ return 0;
+}
+
+int uCAM_TTL120::uCAM_Connect(void)
+{
+ char ser_read[20];
+ int i, retries;
+
+ for(i=0;i<20;i++) //clear the string
+ ser_read[i] = 0;
+ retries=0;
+
+ while(retries < 60)
+ {
+ uCAM_FlushBuffer();
+
+ //Transmit SYNC command
+ uCAM_Command_Send(uCAM_SYNC,0x00,0x00,0x00,0x00);
+
+ wait(.2);
+
+ //read serial buffer and wait for ACK (0xAA0E0DXX0000)
+ uCAM_read(ser_read, 6, .01);
+
+ if((ser_read[0] == 0xAA) &&
+ (ser_read[1] == 0x0E) &&
+ (ser_read[2] == 0x0D) && //skip ser_read[3]
+ (ser_read[4] == 0x00))
+ {
+ //after receiving ACK, wait for SYNC (0xAA0D00000000)
+ uCAM_read(ser_read, 6, 100);
+ if((ser_read[0] == 0xAA) &&
+ (ser_read[1] == 0x0D) &&
+ (ser_read[2] == 0x00) &&
+ (ser_read[3] == 0x00) &&
+ (ser_read[4] == 0x00) &&
+ (ser_read[5] == 0x00))
+ {
+ //Transmit ACK command
+ 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
+ printf(".");
+ wait(.5);
+ printf(".");
+ wait(.5);
+ printf(".");
+ wait(.5);
+ printf(".\r\nFinished\r\n");
+
+ return 1; //Camera connection successful
+ }
+ }
+ retries++;
+ }
+ if(retries == 60)
+ return 0;
+
+ return -1;
+}
+
+int uCAM_TTL120::uCAM_send_INITIAL_80x60_16RAW(void)
+{
+ char ser_read[7];
+ int i;
+
+ uCAM_Command_Send(uCAM_INITIAL,0x00,0x06,0x01,0x00); // p2=0x06-16 bit color(RAW,565(RGB))
+ // p3=0x01-80 x 60 bit resolution // p4=0x01-JPEG res 80 x 64
+ wait(.02);
+
+ for(i=0;i<7;i++) //clear the string
+ ser_read[i] = 0;
+
+ //read serial C buffer and wait for ACK (0xAA0E0DXX0000)
+ uCAM_read(ser_read, 6, 100);
+
+ if((ser_read[0] == 0xAA) &&
+ (ser_read[1] == 0x0E) &&
+ (ser_read[2] == 0x01)){
+ return 1;
+ }
+ else
+ return 0;
+}
+
+int uCAM_TTL120::uCAM_send_INITIAL_80x60_2RAW(void)
+{
+ char ser_read[7];
+ int i;
+ uCAM_Command_Send(uCAM_INITIAL,0x00,0x01,0x01,0x00); // p2=0x01-2 bit GRAY (RAW)
+ // p3=0x01-80 x 60 bit resolution
+ // p4=0x01-JPEG res 80 x 64
+ wait(.02);
+
+ for(i=0;i<7;i++) //clear the string
+ ser_read[i] = 0;
+
+ //read serial C buffer and wait for ACK (0xAA0E0DXX0000)
+ uCAM_read(ser_read, 6, .1);
+
+ if((ser_read[0] == 0xAA) &&
+ (ser_read[1] == 0x0E) &&
+ (ser_read[2] == 0x01))
+ {
+ wait(.050);
+ return 1;
+ }
+ else
+ return 0;
+}
+
+int uCAM_TTL120::uCAM_send_INITIAL_128x128_4RAW(void)
+{
+ char ser_read[7];
+ int i;
+ uCAM_Command_Send(uCAM_INITIAL,0x00,0x02,0x09,0x00); // p2=0x02-4 bit GRAY (RAW)
+ // p3=0x09- 128x128 bit resolution
+ // p4=0x01-JPEG res 80 x 64
+ wait(.02);
+
+ for(i=0;i<7;i++) //clear the string
+ ser_read[i] = 0;
+
+ //read serial buffer and wait for ACK (0xAA0E0DXX0000)
+ uCAM_read(ser_read, 6, 100);
+
+ if((ser_read[0] == 0xAA) &&
+ (ser_read[1] == 0x0E) &&
+ (ser_read[2] == 0x01))
+ {
+ wait(.05);
+ return 1;
+ }
+ else
+ return 0;
+}
+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);
+
+ if(uCAM_GetACK())
+ return 1;
+ else
+ return 0;
+}
+
+int uCAM_TTL120::uCAM_send_GET_PICTURE_80x60_16COL_RAW(void)
+{
+ char ser_read[7];
+ char c;
+ unsigned long pic_bytes;
+ unsigned int i, j, k;
+ unsigned int serbytes_read;
+ unsigned int pixel_col;
+
+ pic_bytes = 0;
+ c=0;
+ serbytes_read = 0;
+
+ for(i=0;i<100;i++)
+ picture[i] = 0;
+
+ while(_cam.readable()){ //flush the buffer
+ char c = _cam.getc();
+ }
+
+ uCAM_Command_Send(uCAM_GET_PICTURE,0x01,0x00,0x00,0x00); // p1=0x01-Snapshot picture
+ wait(.3);
+
+ //read serial C buffer and wait for ACK (0xAA0E0DXX0000)
+ c=uCAM_read(ser_read, 6, 1);
+ wait(.3);
+
+ if(c==6) //received 6 bytes back
+ {
+ if((ser_read[0] == 0xAA) && //first 2 bytes indicate it was a DATA packet
+ (ser_read[1] == 0x0E) &&
+ (ser_read[2] == 0x04)) //returned get pic
+ {
+ //read serial C buffer and wait for ACK (0xAA0E0DXX0000)
+ c=uCAM_read(ser_read, 6, 1);
+
+ if(c==6) //received 6 bytes back
+ {
+ if((ser_read[0] == 0xAA) && //first 2 bytes indicate it was a DATA packet
+ (ser_read[1] == 0x0A))
+ {
+ pic_bytes = (unsigned long)ser_read[3];
+ pic_bytes += (unsigned long)ser_read[4] << 8;
+ pic_bytes += (unsigned long)ser_read[5] << 16;
+
+ serbytes_read = uCAM_read(picture, pic_bytes, .200);
+
+ if(serbytes_read == pic_bytes)
+ {
+ k=0;
+ for(i=0;i<60;i++)
+ {
+ for(j=0;j<80;j++)
+ {
+ pixel_col = picture[k];
+ k++;
+// printf("%d ", pixel_col);
+// uLCD144_Put_Pixel(j, i, pixel_col); //Do something with the pixel
+ }
+ }
+
+ uCAM_Command_Send(uCAM_ACK, 0x0A, 0x00, 0x01, 0x00);
+
+ return pic_bytes;
+ }
+ else
+ return -4;
+ }
+ else
+ return -3;
+ }
+ }
+ else
+ return -2;
+ }
+ return -1;
+}
+
+int uCAM_TTL120::uCAM_send_GET_PICTURE_80x60_2GRAY_RAW(void)
+{
+ char ser_read[7];
+ char c;
+ unsigned long pic_bytes;
+ unsigned int pixel_col;
+ unsigned int i, j, k;
+ int m;
+ unsigned int serbytes_read;
+ int temp;
+
+ pic_bytes = 0;
+ c=0;
+ serbytes_read = 0;
+
+ for(i=0;i<100;i++)
+ picture[i] = 0;
+
+ while(_cam.readable()){ //flush the buffer
+ char c = _cam.getc();
+ }
+
+ uCAM_Command_Send(uCAM_GET_PICTURE,0x01,0x00,0x00,0x00); // p1=0x01-Snapshot picture
+ wait(.3);
+
+ //read serial C buffer and wait for ACK (0xAA0E0DXX0000)
+ c=uCAM_read(ser_read, 6, 1);
+ wait(.2);
+
+ if(c==6) //received 6 bytes back
+ {
+ if((ser_read[0] == 0xAA) && //first 2 bytes indicate it was a DATA packet
+ (ser_read[1] == 0x0E) &&
+ (ser_read[2] == 0x04)) //returned get pic
+ {
+ //read serial C buffer and wait for ACK (0xAA0E0DXX0000)
+ c=uCAM_read(ser_read, 6, 1);
+
+ if(c==6) //received 6 bytes back
+ {
+ if((ser_read[0] == 0xAA) && //first 2 bytes indicate it was a DATA packet
+ (ser_read[1] == 0x0A))
+ {
+ pic_bytes = (unsigned long)ser_read[3];
+ pic_bytes += (unsigned long)ser_read[4] << 8;
+ pic_bytes += (unsigned long)ser_read[5] << 16;
+
+ serbytes_read = uCAM_read(picture, pic_bytes, 200);
+
+ if(serbytes_read == pic_bytes)
+ {
+ k=0;
+ for(i=0;i<60;i++)
+ {
+ for(j=0;j<80;)
+ {
+ temp = picture[k];
+ for(m=14;m>=0;m-=2)
+ {
+ pixel_col = (temp >> m) & 0x03;
+ switch(pixel_col)
+ {
+ case 0:
+ // uLCD144_Put_Pixel(j, i, 0x0000); //0x0000
+ break;
+ case 1:
+ // uLCD144_Put_Pixel(j, i, 0x0180); //0x39e7
+ break;
+ case 2:
+ // uLCD144_Put_Pixel(j, i, 0xc209); //0x7bef
+ break;
+ case 3:
+// uLCD144_Put_Pixel(j, i, 0xFFFF); //0xFFFF
+ break;
+ default:
+ // uLCD144_Put_Pixel(j, i, 0x0000);
+ break;
+ }
+ j++;
+ }
+ k++;
+ }
+ }
+
+ uCAM_Command_Send(uCAM_ACK, 0x0A, 0x00, 0x01, 0x00);
+
+ return pic_bytes;
+ }
+ else
+ return -4;
+ }
+ else
+ return -3;
+ }
+ }
+ else
+ return -2;
+ }
+ return -1;
+}
+
+int uCAM_TTL120::uCAM_send_GET_PICTURE_128x128_4GRAY_RAW(void)
+{
+ char ser_read[7];
+ char c;
+ unsigned long pic_bytes;
+ unsigned int pixel_col;
+ unsigned int i, j, k;
+ unsigned int serbytes_read;
+ int temp;
+
+ pic_bytes = 0;
+ c=0;
+ serbytes_read = 0;
+
+ for(i=0;i<100;i++)
+ picture[i] = 0;
+
+ while(_cam.readable()){ //flush the buffer
+ char c = _cam.getc();
+ }
+
+ uCAM_Command_Send(uCAM_GET_PICTURE,0x01,0x00,0x00,0x00); // p1=0x01-Snapshot picture
+ wait(.3);
+
+ //read serial C buffer and wait for ACK (0xAA0E0DXX0000)
+ c=uCAM_read(ser_read, 6, 1);
+ wait(.2);
+
+ if(c==6) //received 6 bytes back
+ {
+ if((ser_read[0] == 0xAA) && //first 2 bytes indicate it was a DATA packet
+ (ser_read[1] == 0x0E) &&
+ (ser_read[2] == 0x04)) //returned get pic
+ {
+ //read serial C buffer and wait for ACK (0xAA0E0DXX0000)
+ c=uCAM_read(ser_read, 6, 1);
+
+ if(c==6) //received 6 bytes back
+ {
+ if((ser_read[0] == 0xAA) && //first 2 bytes indicate it was a DATA packet
+ (ser_read[1] == 0x0A))
+ {
+ pic_bytes = (unsigned long)ser_read[3];
+ pic_bytes += (unsigned long)ser_read[4] << 8;
+ pic_bytes += (unsigned long)ser_read[5] << 16;
+
+ serbytes_read = uCAM_read(picture, pic_bytes, .2);
+
+ if(serbytes_read == pic_bytes)
+ {
+ k=0;
+ for(i=0;i<128;i++)
+ {
+ for(j=0;j<128;)
+ {
+ temp = picture[k];
+ pixel_col = (temp >> 12) & 0x000F;
+ pixel_col |= ((temp >> 12) & 0x000F) << 6;
+ pixel_col |= ((temp >> 12) & 0x000F) << 11;
+ // uLCD144_Put_Pixel(j, i, pixel_col);
+ printf("%c", pixel_col);
+ j++;
+
+ pixel_col = (temp >> 8) & 0x000F;
+ pixel_col |= ((temp >> 8) & 0x000F) << 6;
+ pixel_col |= ((temp >> 8) & 0x000F) << 11;
+ // uLCD144_Put_Pixel(j, i, pixel_col);
+ printf("%c", pixel_col);
+ j++;
+
+ pixel_col = (temp >> 4) & 0x000F;
+ pixel_col |= ((temp >> 4) & 0x000F) << 6;
+ pixel_col |= ((temp >> 4) & 0x000F) << 11;
+// uLCD144_Put_Pixel(j, i, pixel_col);
+ printf("%c", pixel_col);
+ j++;
+
+ pixel_col = temp & 0x000F;
+ pixel_col |= (temp & 0x000F) << 6;
+ pixel_col |= (temp & 0x000F) << 11;
+// uLCD144_Put_Pixel(j, i, pixel_col);
+ printf("%c", pixel_col);
+ j++;
+
+ k++;
+ }
+ }
+
+ uCAM_Command_Send(uCAM_ACK, 0x0A, 0x00, 0x01, 0x00);
+
+ return pic_bytes;
+ }
+ else
+ return -4;
+ }
+ else
+ return -3;
+ }
+ }
+ else
+ return -2;
+ }
+ return -1;
+}
+
+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);
+}
+
+void uCAM_TTL120::uCAM_TakePic_RAW_16COLOR_80x60(void)
+{
+ uCAM_send_INITIAL_80x60_16RAW();
+ wait(.1);
+ uCAM_send_SNAPSHOT();
+ wait(.1);
+ uCAM_send_GET_PICTURE_80x60_16COL_RAW();
+}
+
+void uCAM_TTL120::uCAM_TakePic_RAW_2GRAY_80x60(void)
+{
+ uCAM_send_INITIAL_80x60_2RAW();
+ wait(.1);
+ uCAM_send_SNAPSHOT();
+ wait(.1);
+
+ while(uCAM_send_GET_PICTURE_80x60_2GRAY_RAW() < 0){
+ wait(.1);
+ uCAM_send_SNAPSHOT();
+ wait(.2);
+ }
+}
+
+void uCAM_TTL120::uCAM_TakePic_RAW_4GRAY_128x128(void)
+{
+ uCAM_send_INITIAL_128x128_4RAW();
+ wait(.100);
+ uCAM_send_SNAPSHOT();
+ wait(.100);
+ while(uCAM_send_GET_PICTURE_128x128_4GRAY_RAW() < 0){
+ wait(.100);
+ uCAM_send_SNAPSHOT();
+ wait(.200);
+ }
+}
+
+void uCAM_TTL120::uCAM_FlushBuffer(void){
+ while(_cam.readable()){ //flush the buffer
+ char c = _cam.getc();
+ }
+}