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- /* Copyright 2021 Colin Lam (Ploopy Corporation)
- * Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
- * Copyright 2019 Sunjun Kim
- * Copyright 2019 Hiroyuki Okada
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #include "adns5050.h"
- #include "wait.h"
- #include "debug.h"
- #include "print.h"
- #include "gpio.h"
-
- #ifndef OPTIC_ROTATED
- # define OPTIC_ROTATED false
- #endif
-
- // Definitions for the ADNS serial line.
- #ifndef ADNS_SCLK_PIN
- # define ADNS_SCLK_PIN B7
- #endif
-
- #ifndef ADNS_SDIO_PIN
- # define ADNS_SDIO_PIN C6
- #endif
-
- #ifndef ADNS_CS_PIN
- # define ADNS_CS_PIN B4
- #endif
-
- #ifdef CONSOLE_ENABLE
- void print_byte(uint8_t byte) { dprintf("%c%c%c%c%c%c%c%c|", (byte & 0x80 ? '1' : '0'), (byte & 0x40 ? '1' : '0'), (byte & 0x20 ? '1' : '0'), (byte & 0x10 ? '1' : '0'), (byte & 0x08 ? '1' : '0'), (byte & 0x04 ? '1' : '0'), (byte & 0x02 ? '1' : '0'), (byte & 0x01 ? '1' : '0')); }
- #endif
-
- // Initialize the ADNS serial pins.
- void adns_init(void) {
- setPinOutput(ADNS_SCLK_PIN);
- setPinOutput(ADNS_SDIO_PIN);
- setPinOutput(ADNS_CS_PIN);
- }
-
- // Perform a synchronization with the ADNS.
- // Just as with the serial protocol, this is used by the slave to send a
- // synchronization signal to the master.
- void adns_sync(void) {
- writePinLow(ADNS_CS_PIN);
- wait_us(1);
- writePinHigh(ADNS_CS_PIN);
- }
-
- void adns_cs_select(void) { writePinLow(ADNS_CS_PIN); }
-
- void adns_cs_deselect(void) { writePinHigh(ADNS_CS_PIN); }
-
- uint8_t adns_serial_read(void) {
- setPinInput(ADNS_SDIO_PIN);
- uint8_t byte = 0;
-
- for (uint8_t i = 0; i < 8; ++i) {
- writePinLow(ADNS_SCLK_PIN);
- wait_us(1);
-
- byte = (byte << 1) | readPin(ADNS_SDIO_PIN);
-
- writePinHigh(ADNS_SCLK_PIN);
- wait_us(1);
- }
-
- return byte;
- }
-
- void adns_serial_write(uint8_t data) {
- setPinOutput(ADNS_SDIO_PIN);
-
- for (int8_t b = 7; b >= 0; b--) {
- writePinLow(ADNS_SCLK_PIN);
-
- if (data & (1 << b))
- writePinHigh(ADNS_SDIO_PIN);
- else
- writePinLow(ADNS_SDIO_PIN);
-
- wait_us(2);
-
- writePinHigh(ADNS_SCLK_PIN);
- }
-
- // tSWR. See page 15 of the ADNS spec sheet.
- // Technically, this is only necessary if the next operation is an SDIO
- // read. This is not guaranteed to be the case, but we're being lazy.
- wait_us(4);
-
- // Note that tSWW is never necessary. All write operations require at
- // least 32us, which exceeds tSWW, so there's never a need to wait for it.
- }
-
- // Read a byte of data from a register on the ADNS.
- // Don't forget to use the register map (as defined in the header file).
- uint8_t adns_read_reg(uint8_t reg_addr) {
- adns_cs_select();
-
- adns_serial_write(reg_addr);
-
- // We don't need a minimum tSRAD here. That's because a 4ms wait time is
- // already included in adns_serial_write(), so we're good.
- // See page 10 and 15 of the ADNS spec sheet.
- // wait_us(4);
-
- uint8_t byte = adns_serial_read();
-
- // tSRW & tSRR. See page 15 of the ADNS spec sheet.
- // Technically, this is only necessary if the next operation is an SDIO
- // read or write. This is not guaranteed to be the case.
- // Honestly, this wait could probably be removed.
- wait_us(1);
-
- adns_cs_deselect();
-
- return byte;
- }
-
- void adns_write_reg(uint8_t reg_addr, uint8_t data) {
- adns_cs_select();
- adns_serial_write(0b10000000 | reg_addr);
- adns_serial_write(data);
- adns_cs_deselect();
- }
-
- report_adns_t adns_read_burst(void) {
- adns_cs_select();
-
- report_adns_t data;
- data.dx = 0;
- data.dy = 0;
-
- adns_serial_write(REG_MOTION_BURST);
-
- // We don't need a minimum tSRAD here. That's because a 4ms wait time is
- // already included in adns_serial_write(), so we're good.
- // See page 10 and 15 of the ADNS spec sheet.
- // wait_us(4);
-
- uint8_t x = adns_serial_read();
- uint8_t y = adns_serial_read();
-
- // Burst mode returns a bunch of other shit that we don't really need.
- // Setting CS to high ends burst mode early.
- adns_cs_deselect();
-
- data.dx = convert_twoscomp(x);
- data.dy = convert_twoscomp(y);
-
- return data;
- }
-
- // Convert a two's complement byte from an unsigned data type into a signed
- // data type.
- int8_t convert_twoscomp(uint8_t data) {
- if ((data & 0x80) == 0x80)
- return -128 + (data & 0x7F);
- else
- return data;
- }
-
- // Don't forget to use the definitions for CPI in the header file.
- void adns_set_cpi(uint8_t cpi) { adns_write_reg(REG_MOUSE_CONTROL2, cpi); }
-
- bool adns_check_signature(void) {
- uint8_t pid = adns_read_reg(REG_PRODUCT_ID);
- uint8_t rid = adns_read_reg(REG_REVISION_ID);
- uint8_t pid2 = adns_read_reg(REG_PRODUCT_ID2);
-
- return (pid == 0x12 && rid == 0x01 && pid2 == 0x26);
- }
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