3618a5352f
This lays the groundwork for implementing timed operations (#86). The M0 can be configured to automatically change modes when its byte count reaches a specific value. Checking the counter against the threshold and dispatching to the next mode is handled by a new `jump_next_mode` macro, which replaces the unconditional branches back to the start of the TX and RX loops. Making this change work requires some rearrangement of the code, such that the destinations of all conditional branch instructions are within reach. These branch instructions (`b[cond] label`) have a range of -256 to +254 bytes from the current program counter. For this reason, the TX shortfall handling is moved earlier in the file, and branches in the idle loop are restructured to use an unconditional branch to rx_start, which is furthest away. The additional code for switching modes adds 9 cycles to the normal RX path, and 10 to the TX path (the difference is because the dispatch in `jump_next_mode` is optimised for the longer RX path).
56 lines
1.5 KiB
C
56 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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uint32_t threshold;
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uint32_t next_mode;
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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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