109 lines
3.7 KiB
C
109 lines
3.7 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2022 Jeff Epler for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hal_gpio.h"
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#include "py/runtime.h"
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#include "shared-bindings/time/__init__.h"
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#include "shared-bindings/floppyio/__init__.h"
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#include "common-hal/floppyio/__init__.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#define T2_5 (FLOPPYIO_SAMPLERATE * 5 / 2 / 1000000)
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#define T3_5 (FLOPPYIO_SAMPLERATE * 7 / 2 / 1000000)
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#define MFM_IO_MMIO (1)
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#include "lib/adafruit_floppy/src/mfm_impl.h"
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__attribute__((optimize("O3")))
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int common_hal_floppyio_flux_readinto(void *buf, size_t len, digitalio_digitalinout_obj_t *data, digitalio_digitalinout_obj_t *index) {
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uint32_t index_mask;
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volatile uint32_t *index_port = common_hal_digitalio_digitalinout_get_reg(index, DIGITALINOUT_REG_READ, &index_mask);
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uint32_t data_mask;
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volatile uint32_t *data_port = common_hal_digitalio_digitalinout_get_reg(data, DIGITALINOUT_REG_READ, &data_mask);
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#undef READ_INDEX
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#undef READ_DATA
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#define READ_INDEX() (!!(*index_port & index_mask))
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#define READ_DATA() (!!(*data_port & data_mask))
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memset(buf, 0, len);
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uint8_t *pulses = buf, *pulses_ptr = pulses, *pulses_end = pulses + len;
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common_hal_mcu_disable_interrupts();
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// wait for index pulse low
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while (READ_INDEX()) { /* NOTHING */
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}
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// if data line is low, wait till it rises
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while (!READ_DATA()) { /* NOTHING */
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}
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// and then till it drops down
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while (READ_DATA()) { /* NOTHING */
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}
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uint32_t index_state = 0;
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while (pulses_ptr < pulses_end) {
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index_state = (index_state << 1) | READ_INDEX();
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if ((index_state & 3) == 2) { // a zero-to-one transition
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break;
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}
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unsigned pulse_count = 3;
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while (!READ_DATA()) {
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pulse_count++;
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}
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while (READ_DATA()) {
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pulse_count++;
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}
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*pulses_ptr++ = MIN(255, pulse_count);
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}
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common_hal_mcu_enable_interrupts();
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return pulses_ptr - pulses;
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}
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int common_hal_floppyio_mfm_readinto(void *buf, size_t n_sectors, digitalio_digitalinout_obj_t *data, digitalio_digitalinout_obj_t *index) {
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mfm_io_t io;
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io.index_port = common_hal_digitalio_digitalinout_get_reg(index, DIGITALINOUT_REG_READ, &io.index_mask);
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io.data_port = common_hal_digitalio_digitalinout_get_reg(data, DIGITALINOUT_REG_READ, &io.data_mask);
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common_hal_mcu_disable_interrupts();
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uint8_t validity[n_sectors];
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int result = read_track(io, n_sectors, buf, validity);
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common_hal_mcu_enable_interrupts();
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return result;
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}
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