00b5ed7d62
In TX_START mode, a lack of data to send is not treated as a shortfall. Zeroes are written to SGPIO, but no shortfall is recorded in the stats. Using this mode helps avoid spurious shortfalls at startup. As soon as there is data to transmit, the M0 switches to TX_RUN mode. This change adds five cycles to the normal TX path, in order to check for TX_START mode before sending data, and to switch to TX_RUN in that case. It also adds two cycles to the TX shortfall path, to check for TX_START mode and skip shortfall processing in that mode. Note the allocation of r3 to store the mode setting, such that this value is still available after the tx_zeros routine.
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/*
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* Copyright 2022 Great Scott Gadgets
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*
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* This file is part of HackRF.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __M0_STATE_H__
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#define __M0_STATE_H__
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#include <stdint.h>
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#include <usb_request.h>
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struct m0_state {
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uint32_t mode;
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uint32_t m0_count;
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uint32_t m4_count;
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uint32_t num_shortfalls;
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uint32_t longest_shortfall;
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uint32_t shortfall_limit;
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};
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enum m0_mode {
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M0_MODE_IDLE = 0,
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M0_MODE_RX = 1,
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M0_MODE_TX_START = 2,
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M0_MODE_TX_RUN = 3,
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};
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/* Address of m0_state is set in ldscripts. If you change the name of this
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* variable, it won't be where it needs to be in the processor's address space,
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* unless you also adjust the ldscripts.
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*/
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extern volatile struct m0_state m0_state;
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usb_request_status_t usb_vendor_request_get_m0_state(
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usb_endpoint_t* const endpoint, const usb_transfer_stage_t stage);
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#endif/*__M0_STATE_H__*/
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