ChibiOS Free Embedded RTOS

Got it. In ibnotify of hal_serial_usb.c
Thanks!

Hi,
First let me say the driver works perfectly OK.

But when I digging into the code, some part I cannot understand. Here I'm based on ChibiOS 17.6.0, I think the part in 16.1.8 is identical.
When an OUT packet arrives at data EP, here is what happens:
1. The USB lld saves the packet to assigned ...

Giovanni wrote:Hi,

It is caused by the IRQ service times, if you need to operate at very high speeds then try the UART driver, it uses DMA.

Giovanni

Yes understand IRQ causes the delay. But why serving TXE takes longer time for higher baudrate? Should they take same time?

Hi,
I'm testing Serial driver performance.
A simple program only calls
sdWrite(&SD1, buf, 64);
chThdSleepMilliseconds(500);
in the main loop.
SD1 is set to 115200 and 921600 respectively. All ChibiOS debug checks are disabled.
As can be seen from the attached screenshot.
115200 ...

I can confirm this behavior using Saleae Logic tapping on USB wires. I'm using a STM32F303.
When I'm sending 64 bytes, I see one 64 bytes packet and one 1 byte packet.
When I'm sending 64 bytes via CDC, only one OUT packet is captured with length 64 bytes, no zero length packet follows.

I see no ...

I've successfully implemented a USB-UART bridge using Serial-over-USB (SDU1) and Serial (SD1).

Now I want to implement CDC_SET_LINE_CODING. I understand that I can write my own sduRequestsHook to do this. But sduRequestsHook is called from ISR and I cannot call thread level function sdStop(&SD1 ...

I dig in a little further and it seems freeze at
std.isra()

call stack was
std.isra()
__sinit()
_puts_r()
puts()
main()

I have no clue what is missing here.

No, I checked, not existing in map file.
While from a SDK build, I can see
c:/apps/armgcc/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv6-m\libc_nano.a(lib_a-init.o)
c:/apps/armgcc/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv6-m/rdimon-crt0.o (__libc ...

I've been trying semihosting, by changing LD variable in the Makefile to:
LD = $(TRGT)gcc -specs=rdimon.specs
The balance I need to do is just to add
initialise_monitor_handles()
in main() to get printf() working.

However, if I try use newlib at the same time, where
LD = $(TRGT)gcc -specs=nano ...