usb-fifo.c File Reference

USB FIFO access. More...

#include <stdio.h>
#include "xpal_extmem.h"

Functions
void	USBInit (void)
	Initialises the USB Interface.
void	USB_assign_stdio (void)
	assign USB interface to stdio streams
int8_t	USB_set_flags (USB_stream_sel_t usb_stream, USB_flag_action_t action, USB_flags_t flags)
	set blocking/non-blocking characteristic for USB FIFO
int8_t	USB_get_flags (USB_stream_sel_t usb_stream, USB_flags_t *flags)
	get current flags for USB FIFO
Variables
USB_statistics_t	USB_statistics
	USB I/O statistics.

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Detailed Description

USB FIFO access.

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Function Documentation

int8_t USB_set_flags	(	USB_stream_sel_t	usb_stream,
		USB_flag_action_t	action,
		USB_flags_t	flags
	)

set blocking/non-blocking characteristic for USB FIFO

• usb_stream STDIN/STDOUT selector
• action set/clear/toggle/assign
• flags Flags

{
  FILE * stream;
  unsigned int udata;

  stream = get_stream_from_sel (usb_stream);
  if (!stream) return -1;

  udata = (unsigned int)stream->udata;

  switch (action) {
  case USB_flag_clear:
    udata &= ~flags;
    break;
  case USB_flag_toggle:
    udata ^= flags;
    break;
  case USB_flag_set:
    udata |= flags;
    break;
  case USB_flag_assign:
    udata = flags;
    break;
  default:
    return -1;
  }

  stream->udata = (void*)udata;

  return 0;
}

void USBInit

(

void

)

Initialises the USB Interface.

initialize USB interface

Warning:

This function has to be sent before calling any standard I/O function.

{
  /* Init USB specific signals */
  HL_USB_TXE_DDR   &= ~( _BV(HL_USB_TXE) ); // in
  HL_USB_RXF_DDR   &= ~( _BV(HL_USB_RXF) ); // in
  HL_USB_PWREN_DDR &= ~( _BV(HL_USB_PWREN) ); // in
  HL_USB_RESET_PORT |=  ( _BV(HL_USB_RESET) ); // high
  HL_USB_RESET_DDR |=  ( _BV(HL_USB_RESET) ); // out
  
  /* Reset USB Controller */
  // HL_USB_RESET_PORT &= ~( _BV(HL_USB_RESET) ); // low
  // HL_USB_RESET_PORT |=  ( _BV(HL_USB_RESET) ); // high
}