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35 lines
1.3 KiB
C
35 lines
1.3 KiB
C
// Copyright 2022 Stefan Kerkmann (KarlK90)
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// Copyright 2022 Ulrich Spörlein (@uqs)
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// Copyright 2021 Alabastard (@Alabastard-64)
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// Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
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// Copyright 2019 Sunjun Kim
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// Copyright 2020 Ploopy Corporation
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "pmw33xx_common.h"
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#include "progmem.h"
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uint16_t pmw33xx_get_cpi(uint8_t sensor) {
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if (sensor >= pmw33xx_number_of_sensors) {
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return 0;
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}
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uint8_t cpival = pmw33xx_read(sensor, REG_Config1);
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// In some cases (100, 900, 1700, 2500), reading the CPI corrupts the firmware and the sensor stops responding.
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// To avoid this, we write the value back to the sensor, which seems to prevent the corruption.
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pmw33xx_write(sensor, REG_Config1, cpival);
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return (uint16_t)((cpival + 1) & 0xFF) * PMW33XX_CPI_STEP;
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}
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void pmw33xx_set_cpi(uint8_t sensor, uint16_t cpi) {
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if (sensor >= pmw33xx_number_of_sensors) {
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return;
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}
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uint8_t cpival = CONSTRAIN((cpi / PMW33XX_CPI_STEP), (PMW33XX_CPI_MIN / PMW33XX_CPI_STEP), (PMW33XX_CPI_MAX / PMW33XX_CPI_STEP)) - 1U;
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pmw33xx_write(sensor, REG_Config1, cpival);
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}
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// PID, Inverse PID, SROM version
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const uint8_t pmw33xx_firmware_signature[2] PROGMEM = {0x42, 0xBD};
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