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Hi,Mike. I was confused at first, but Teensy4's HW serial uses registers with different numbers. See HardwareSerialX.h in the teensy4 folder.(X=1～8) (C:\Program Files (x86)\Arduino\hardware\teensy\avr\cores\teensy4) You should know which number of registers to use in that file.

O.K. I understand how it works little by little. I got rid of the extra code. This works enough. /* Receive 8 bytes from serial8 and transfer to RAM with DMA */ #include "DMAChannel.h" unsigned char DMA_RxBuf[50]; //receive buffer 50 DMAChannel dmachannel1; void...

Do you suggest code like this? The FIFO buffer capacity was set to 1 byte. This works fine. /* Receive 8 bytes from serial 8 and transfer to RAM with DMA Use a 4-byte FIFO buffer for reception */ #include "DMAChannel.h" //unsigned char DMA_TxBuf[50]; //transfer buffer 50...

This is because the serial receive FIFO buffer is 4 bytes. DMA trigger when the 4-byte FIFO buffer is full. I think that is the most efficient ...

I have succeeded in increasing the serial of Teensy 4.1 to 20Mbps. https://forum.pjrc.com/threads/67150-Teensy4-1-MAX-baud-rate?p=278787#post278787 The other devices are PIC32MZ and RX72T.

Thank you for your help KurtE-san. In order to communicate with other microcomputers, I need to send 8 bytes and then receive 8 bytes. These communications need to use very little CPU resources. In addition, communication is very high speed (20 Mbps). I am dissatisfied with generating an...

DMA in Teensy 4.1 is hopelessly difficult. I wander around the labyrinth but I was able to escape from it temporarily. I succeeded in receiving 8 bytes from the serial. /* Receive 8 bytes from serial 8 and transfer to RAM with DMA Use a 4-byte FIFO buffer for reception */ #include...

I'm trying to transfer the data received by UART to RAM by DMA, but it fails. When I execute the code below and enter 4 characters from the terminal software, an unintended result is output. #include "DMAChannel.h" unsigned char DMA_TxBuf[50]; //transfer buffer 50 unsigned char...

I extended the harness length to 2.5m and experimented again. I sent and received 20Mbps by 5000byte. The result was all 5000 bytes OK. It was carried out about 10 times, and the same result was obtained. I am trying to apply this to a 250W-motor driver. I am wondering if it is possible to...

I tried a program that connects teensy 4.1 and PIC32MZ and echo back. Teensy 4.1 sends characters at 20Mbps and PIC32MZ just adds 1 and returns. It looks working fine. void setup() { pinMode(3, OUTPUT); while (!Serial) ; // Serial1.begin(3000000); //3M OK //...

I have not tried to send and receive actual data yet. I just saw the output waveform of TX1. I'm going to connect Teensy 4.1 with Renesas RX72T and Microchip PIC32MZ with RS485 and try the actual data communication.

Thank you Mr. KurtE ! It was exactly what you said! I am very grateful for your advice. I succeeded in raising the baud rate to 20Mbps. I just rewrote the UART_CLK_SEL bit in the CCM_CSCDR1 register to 0. Look at the code and the execution result. void setup() { // Serial1.begin(3000000)...

Thanks for your reply Kurt-san. I hope I can get a higher baud rate with the method you suggested. I'm still not familiar with the clock division of the IMXRT1060. I'll try your ideas as I peruse the hardware manual.

Hi！ I have been teensydiuno for the third day. I want to communicate with other MPUs at high speed using RS485 communication. I set the teensy 4.1 hardware serial to 6Mbps, but higher values ​​didn't work. Is there any way to get higher speeds? void setup() { // Serial1.begin(3000000)...