But you can see that sending one block (80byte) is done in about 32µs.

Here some measurement results for 4MHz SPI frequency:Īnd here a measurement with 32MHz SPI frequency (can't resolve details with my LA at this speed). Thus, you get a synchronization of the sending and receiving data rate for free. The underlying PC driver is smart enough to pause sending when the FW is not reading the data from the stream. The latest in the Teensy microcontroller development board line, the 4.0 returns to the smaller form-factor last seen with the 3.2. Port.Write(data, 0, bufSize) // send out data, driver will pause if necessaryīoth, FW and SW work without issue here and I didn't observe any data loss. Paul Stoffregen did it again: the Teensy 4.0 has been released. While (!Console.KeyAvailable) // stop program on any key press Using (var port = new SerialPort('COM11')) SPI.beginTransaction(SPISettings(4'000'000, MSBFIRST, SPI_MODE0)) ĭigitalWriteFast(CS, LOW) // assuming an active low chip selectįor (unsigned i = 0 i this is auto syncing the rate with the FW read rate. The board can be powered through the Teensys USB port or via an external 7 to 24 VDC power supply connected to the onboard SMPS. Connection to the Teensy is via SPI running at 60MHz. It includes a 480x320 3.5' capacitive touch screen with ILI9488 LCD controller. If (ringBuffer.available() >= blockSize) // send only a complete data block The Teensy 4.0 (installed) board comes with a CAN2.0 (Classic CAN) or CAN FD port. For the NOR, NAND Flash support is provided for SPI and QSPI in the case of the Teensy 4.1.

Here some prove of principle code showing how to achieve this: #include 'SPI.h'Ĭircular_Buffer ringBuffer // adjust buffer size if necessary Teensy 3.6 + 2.8' TFT LCD Display SPI Serial 240320 ILI9341 connection and code Just doing some experiments with a Teensy 3.6 microcontroller board, a graphical display and some other bits and pieces. This is a wrapper for the LittleFS File System for the Teensy family of microprocessors and provides support for RAM Disks, NOR and NAND Flash chips, and FRAM chips. To achieve your data transfer requirement (1 block of 40 16bit words every 250µs) it might be best to send out one block of data in a timer ISR and invoke this ISR with 4kHz. I suggest to use a simple ring buffer (e.g. Actually, for a T4.x a data rate of 300kB over the virtual serial port is not demanding at all.

Spi programmer with teensy