Save memory (move usb mass storage buffer to reusableBuffer) (#5579)

* Save 128 byte by moving variable to stack

* Make usb mass storage buffer smaller on F2 processors and put into reuseablebuffer

- Lower USB mass storage buffer to 512 bytes per default on F2
  targets, makes usb speed slightly slower ~600 kB/s instead ~700 KB/s
  in my tests, saving 3584 bytes
- Save another ~300 bytes by putting that buffer into reusableBuffer

* Don't put id into reusuableBuffer

All uses of id can be on the stack as well. Makes no difference for ram usage but makes it safer to reuse reusableBuffer

* Only link cdc serial when needed

We always linked usb cdc even in non debug builds. CDC uses about ~600 byte of RAM for its buffers and structures.

This commit is contained in:

Arne Schwabe

2018-01-26 19:00:47 +01:00

committed by

Bertrand Songis

parent 95df593c2f

commit 4925e756a6

15 changed files with 53 additions and 24 deletions

									
										radio/src/serial.cpp
									
		+1
		-1
	
												View File
												
				@@ -26,7 +26,7 @@

				#define PRINTF_BUFFER_SIZE    128

				void serialPutc(char c) {

				#if !defined(BOOT)

				#if !defined(BOOT) && defined(USB_SERIAL)

				  if (getSelectedUsbMode() == USB_SERIAL_MODE)

				    usbSerialPutc(c);

				#endif