USB connection stuck at "lepton_getRawValues()" function

[jandriea]

I only have Teensy 3.6 and Lepton 2 (shutter) at the moment and connect them with cables. Every time I try to run the firmware, it will always stuck at "lepton_getRawValues()". This problem occurs because teensy never got 60 lines from lepton. It always loop at line 0 because the error value is count up to 255. I have tried with 2 pcs Lepton 2 (shutter) and 1 Lepton 2(non shutter) and the problem still exist. This is how I connect teensy with lepton :

• pin 11 to MOSI
• pin 12 to MISO
• pin 14 to CLK
• pin 15 to CS
• pin 18 to SDA
• pin 19 to SCL

I powered them from USB so I connect this two pin

• pin GND (Teensy) to GND (Lepton)
• pin Vin (Teensy) to Vin (Lepton)

I already test the Lepton module with my own code to read the package (using SPI and SPI1) and I can get number 0 - 60 from the first two bytes (ID bytes). So there should be no problem with my Lepton module.

Any idea why this happens?

[maxritter]

Can you post the full code you are using to test this setup?

If you connect CLK to pin 14, you also need to issue startAltClockline() in addition to SPI.beginTransaction(SPISettings(20000000, MSBFIRST, SPI_MODE1)) and digitalWrite(pin_lepton_cs, LOW) to begin a transaction with the Lepton2.

What is the LeptonReadError retVal, when you try to read a package?

[jandriea]

Hi Max, I'm using this code to test my Lepton module

I'm gonna use this fancy spoiler because the code is too long

```Arduino #include "Wire.h" #include "SPI.h" #define USE_SPI1 /* Wiring - SPI1 -- CS pin 6 -- MOSI pin 21 -- MISO pin 5 -- SCK pin 20 - SPI -- CS pin 10 -- MOSI pin 11 -- MISO pin 12 -- SCK pin 13 */ #ifdef USE_SPI1 #define pin_lepton_cs 6 #define pin_lepton_mosi (21) #define pin_lepton_miso (5) #define pin_lepton_sck (20) #else #define pin_lepton_cs (10) #endif void setup() { // put your setup code here, to run once: Wire.begin(); Serial.begin(115200); Serial.println("Lepton module test"); #ifdef USE_SPI1 // Initiate lepton SPI Serial.println("Init SPI1"); pinMode(pin_lepton_cs, OUTPUT); digitalWriteFast(pin_lepton_cs, HIGH); SPI1.setMISO(pin_lepton_miso); SPI1.setMOSI(pin_lepton_mosi); SPI1.setSCK(pin_lepton_sck); SPI1.begin(); #else // Initiate lepton SPI Serial.println("Init SPI"); pinMode(pin_lepton_cs, OUTPUT); digitalWriteFast(pin_lepton_cs, HIGH); SPI.begin(); #endif } void loop() { // put your main code here, to run repeatedly: int line = 0; byte leptonFrame[164]; byte imageFrame[60 * 164]; while (line != 60) { #ifdef USE_SPI1 // Start transaction SPI1.beginTransaction(SPISettings(20000000, MSBFIRST, SPI_MODE1)); // Initiate CS pin digitalWriteFast(pin_lepton_cs, LOW); // Receive one frame over SPI for (int i = 0; i < (164 / 2); i++){ // Read value via SPI leptonFrame[2 * i] = SPI1.transfer(0x00); leptonFrame[2 * i + 1] = SPI1.transfer(0x00); } // Disable CS pin digitalWriteFast(pin_lepton_cs, HIGH); // Stop transaction SPI1.endTransaction(); #else // Start transaction SPI.beginTransaction(SPISettings(20000000, MSBFIRST, SPI_MODE1)); // Initiate CS pin digitalWriteFast(pin_lepton_cs, LOW); // Receive one frame over SPI for (int i = 0; i < (164 / 2); i++){ // Read value via SPI leptonFrame[2 * i] = SPI.transfer(0x00); leptonFrame[2 * i + 1] = SPI.transfer(0x00); } // Disable CS pin digitalWriteFast(pin_lepton_cs, HIGH); // Stop transaction SPI.endTransaction(); #endif if ((leptonFrame[0] & 0x0F) != 0x0F){ if (leptonFrame[1] == line){ for (int i = 0; i < 164; i++){ // Save frame imageFrame[(line * 164) + i] = leptonFrame[i]; } line++; } } } // Print lepton frame ID for (size_t i = 0; i < 60; i++) { Serial.printf("%02X\t", imageFrame[(164 * i) + 1]); if (i % 10 == 9) { Serial.println(); } } Serial.println(); while (1); } ```

The output should be like this

Lepton module test
Init SPI1
00  01  02  03  04  05  06  07  08  09
0A  0B  0C  0D  0E  0F  10  11  12  13
14  15  16  17  18  19  1A  1B  1C  1D
1E  1F  20  21  22  23  24  25  26  27
28  29  2A  2B  2C  2D  2E  2F  30  31
32  33  34  35  36  37  38  39  3A  3B

Somehow when I tried my code with CS at pin 15 and SCK at pin 14, it just hung up and never print any result (after init SPI) so I failed to replicate the same connection as DIY-Thermocam to make the lepton work.

the retVal value are 0,1, and sometimes 3

[maxritter]

I am closing this issue now, as it's not directly related to the DIY-Thermocam.