Hi,
I am using the Teensyduino Beta 1.57 on a great, full featured Teensy 4.1
I am implementing a file transfer as soon as a pen drive ist inserted to the USB Host. It works, slowly but stable.
Declaration section of the Code:
In the code i iterate through a folder on local SD to copy all containing Files to USB. Source and Destination have identical names on both drives.
When I declare the Copy Buffer with EXTMEM, Reading from SD works, but the write Operation to USB Pen Drive hangs.
I am using the Teensyduino Beta 1.57 on a great, full featured Teensy 4.1
I am implementing a file transfer as soon as a pen drive ist inserted to the USB Host. It works, slowly but stable.
Declaration section of the Code:
Code:
USBHost myusb;
USBHub hub1(myusb);
USBHub hub2(myusb);
USBDrive USBDrive1(myusb);
USBDrive USBDrive2(myusb);
USBFilesystem USBFS(myusb);
//create a buffer for file transfer
char CopyBuffer[65536]; // works
// EXTMEM char CopyBuffer[65536] // does not work
In the code i iterate through a folder on local SD to copy all containing Files to USB. Source and Destination have identical names on both drives.
Code:
File newFile = USBFS.open(TransferFile.c_str(), FILE_WRITE);
File oldFile = SD.open(TransferFile.c_str(), FILE_READ);
// quite slow
int i;
while (oldFile.available())
{
digitalWrite(LEDPinYellow, HIGH);
digitalWrite(LEDPinGreen, LOW);
i = oldFile.readBytes(CopyBuffer, 65536);
digitalWrite(LEDPinYellow, LOW);
digitalWrite(LEDPinGreen, HIGH);
newFile.write(CopyBuffer, i);
}
digitalWrite(LEDPinYellow, LOW);
digitalWrite(LEDPinGreen, LOW);
oldFile.close();
newFile.close();
When I declare the Copy Buffer with EXTMEM, Reading from SD works, but the write Operation to USB Pen Drive hangs.