Infrared light, or IR, consists of the long wavelengths of light just beyond our visual perception of nearer red wavelengths in the visible spectrum. As their temperature increases, objects begin to emit light in the visible spectrum, beginning with a dim red glow before reaching a white hot (which means it's covering most of the visible spectrum) and eventually releasing most of that energy in ultraviolet wavelengths and beyond. Around room temperature, most objects emit this radiation at infrared wavelengths. This property is referred to as blackbody radiation. Im trying to get the lepton 3 to work on my stm32f746g-discovery board.All matter above absolute zero (−459.67☏) emits electromagnetic radiation as a function of its temperature. When telemetry is enabled in Lepton 3, it results in 1 additional packet per segment for a total of 2 extra video lines. For Lepton 3, the sync pulse represents when the next available segment is available whereas for Lepton it indicates when the next available frame is available.Ĥ) When telemetry is enabled in Lepton, it results in three extra video lines (63 total packets per frame). The frequency of the pulse is 4X higher on Lepton 3 than on Lepton. The maximum SPI clock rate for both modules is 20 MHz.ģ) Both Lepton and Lepton 3 provide the option to output a sync pulse on GPIO3. Consequently, the minimum SPI clock rate is 4X faster. On Lepton 3, the host must decode both the packet number and the segment number.Ģ) The total number of bits per frame is 4X greater for Lepton 3 than for Lepton. The four most significant differences between the Lepton and Lepton 3 VoSPI interfaces are:ġ) On Lepton, reconstructing a video frame from the individual packets requires the host to decode the packet number from each packet header. More details in this document:Ĭomparing the Lepton 2X series (80圆0) resolution and the Lepton 3 (160x120) resolution. If you pay attention to something wrong in the code which prevents increasing the frame rate, let me know.Īre you using a Lepton 2 or Lepton 3? The Lepton 3 will require acquisition of not only the "Frames" but also 4 "segments" There are also 2 blank screens output by the Lepton Modules. I'm succesfully getting a stream, but I have to put a delay of 1 sec between each frame, and have to skip frames between 2 frames I'm sending to the computer. HAL_Delay(185) // CS is already disabled so the delay is enougth If(frame_number 1000) // 800 lines = 5 bad frames = resync needed If( (FramePacket & 0x0f) != 0x0f ) // not discard frame HAL_UART_Transmit(&huart2, &FramePacket, LEPTON_PACKET_LENGTH, 1000) // PRINT LINE HAL_SPI_Receive(&hspi1, &FramePacket, LEPTON_PACKET_LENGTH, 1000) // READ LINE Uint8_t i, frame_number, frame_complete=0 HAL_UART_Transmit_DMA(&huart2, &IMG, LEPTON_IMG_SIZE_BYTES) While(huart2.gState != HAL_UART_STATE_READY) // wait for transmission to complete HAL_UART_Transmit_DMA(&huart2, &thermalView_header, 4) // print header Uint8_t thermalView_header = // 4-byte header for ThermalView application Uint8_t timeStamp = (HAL_GetTick() - last_frame_millis) // calculate time passed since last been here * Initialize all configured peripherals */ I compiled and downloaded the following code on my board: int main(void) I connected my Flir Lepton Camera to my board, and I'm trying to have a continuous stream of the image, thanks to the program ThermalView (source code here: )
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