73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/* Copyright 2021 Colin Lam (Ploopy Corporation)
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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 2019 Hiroyuki Okada
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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 of the License, or
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* (at your option) 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. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stdbool.h>
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// CPI values
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// clang-format off
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#define CPI125 0x11
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#define CPI250 0x12
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#define CPI375 0x13
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#define CPI500 0x14
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#define CPI625 0x15
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#define CPI750 0x16
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#define CPI875 0x17
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#define CPI1000 0x18
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#define CPI1125 0x19
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#define CPI1250 0x1a
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#define CPI1375 0x1b
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// clang-format on
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#define constrain(amt, low, high) ((amt) < (low) ? (low) : ((amt) > (high) ? (high) : (amt)))
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// Definitions for the ADNS serial line.
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#ifndef ADNS5050_SCLK_PIN
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# error "No clock pin defined -- missing ADNS5050_SCLK_PIN"
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#endif
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#ifndef ADNS5050_SDIO_PIN
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# error "No data pin defined -- missing ADNS5050_SDIO_PIN"
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#endif
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#ifndef ADNS5050_CS_PIN
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# error "No chip select pin defined -- missing ADNS5050_CS_PIN"
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#endif
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typedef struct {
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int8_t dx;
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int8_t dy;
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} report_adns5050_t;
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// A bunch of functions to implement the ADNS5050-specific serial protocol.
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// Note that the "serial.h" driver is insufficient, because it does not
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// manually manipulate a serial clock signal.
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void adns5050_init(void);
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void adns5050_sync(void);
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uint8_t adns5050_serial_read(void);
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void adns5050_serial_write(uint8_t data);
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uint8_t adns5050_read_reg(uint8_t reg_addr);
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void adns5050_write_reg(uint8_t reg_addr, uint8_t data);
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report_adns5050_t adns5050_read_burst(void);
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void adns5050_set_cpi(uint16_t cpi);
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uint16_t adns5050_get_cpi(void);
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int8_t convert_twoscomp(uint8_t data);
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bool adns5050_check_signature(void);
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