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[lm4f] Added a note for Windows users to the README

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Dirk Braun
2013-07-11 23:24:13 +02:00
committed by Karl Palsson
parent 408fa52ec3
commit 210761e1df
1 changed files with 26 additions and 0 deletions
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26
examples/lm4f/stellaris-ek-lm4f120xl/usb_to_serial_cdcacm/README
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@@ -40,3 +40,29 @@ The red LED is lit while the UART is sending data.
The blue LED is lit while data is read from the UART. The blue LED is lit while data is read from the UART.
The red and blue LEDs will only be lit for very short periods of time, thus they The red and blue LEDs will only be lit for very short periods of time, thus they
may be difficult to notice. may be difficult to notice.
------------------------------------------------------------------------------
Windows Quirks
------------------------------------------------------------------------------
On openening the CDCACM port Windows send a SET_LINE_CODING request with the
desired baud rate but without valid databits. To run this example CDDACM device
under Windows you have to return always 1 when a SET_LINE_CODING request is
received. The following code should work:
File: usb_cdcacm.c
Function: cdcacm_control_request()
case USB_CDC_REQ_SET_LINE_CODING:{
struct usb_cdc_line_coding *coding;
if (*len < sizeof(struct usb_cdc_line_coding))
{
return 0;
}
coding = (struct usb_cdc_line_coding *)*buf;
glue_set_line_coding_cb(coding->dwDTERate,
coding->bDataBits,
coding->bParityType,
coding->bCharFormat);
return 1;