a7bd1e3ede
To enable this, we keep a count of the current shortfall length. Each time an SGPIO read/write cannot be completed due to a shortfall, we increase this length. Each time an SGPIO read/write is completed successfully, we reset the shortfall length to zero. When a shortfall occurs and the existing shortfall length is zero, this indicates a new shortfall, and the shortfall count is incremented. This change adds one cycle to the normal RX & TX paths, to zero the shortfall count. To enable this to be done in a single cycle, we keep a zero handy in a high register. The extra accounting adds 10 cycles to the TX and RX shortfall paths, plus an additional 3 cycles to the RX shortfall path since there are now two branches involved: one to the shortfall handler, and another back to the main loop.
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/*
|
|
* Copyright 2022 Great Scott Gadgets
|
|
*
|
|
* This file is part of HackRF.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, Inc., 51 Franklin Street,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef __M0_STATE_H__
|
|
#define __M0_STATE_H__
|
|
|
|
#include <stdint.h>
|
|
#include <usb_request.h>
|
|
|
|
struct m0_state {
|
|
uint32_t mode;
|
|
uint32_t m0_count;
|
|
uint32_t m4_count;
|
|
uint32_t num_shortfalls;
|
|
};
|
|
|
|
enum m0_mode {
|
|
M0_MODE_IDLE = 0,
|
|
M0_MODE_RX = 1,
|
|
M0_MODE_TX = 2,
|
|
};
|
|
|
|
/* Address of m0_state is set in ldscripts. If you change the name of this
|
|
* variable, it won't be where it needs to be in the processor's address space,
|
|
* unless you also adjust the ldscripts.
|
|
*/
|
|
extern volatile struct m0_state m0_state;
|
|
|
|
usb_request_status_t usb_vendor_request_get_m0_state(
|
|
usb_endpoint_t* const endpoint, const usb_transfer_stage_t stage);
|
|
|
|
#endif/*__M0_STATE_H__*/
|