/* Copyright 2021 Colin Lam (Ploopy Corporation) * Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) * 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 . */ #include "adns5050.h" #include "wait.h" #include "debug.h" #include "gpio.h" // Registers // clang-format off #define REG_PRODUCT_ID 0x00 #define REG_REVISION_ID 0x01 #define REG_MOTION 0x02 #define REG_DELTA_X 0x03 #define REG_DELTA_Y 0x04 #define REG_SQUAL 0x05 #define REG_SHUTTER_UPPER 0x06 #define REG_SHUTTER_LOWER 0x07 #define REG_MAXIMUM_PIXEL 0x08 #define REG_PIXEL_SUM 0x09 #define REG_MINIMUM_PIXEL 0x0a #define REG_PIXEL_GRAB 0x0b #define REG_MOUSE_CONTROL 0x0d #define REG_MOUSE_CONTROL2 0x19 #define REG_LED_DC_MODE 0x22 #define REG_CHIP_RESET 0x3a #define REG_PRODUCT_ID2 0x3e #define REG_INV_REV_ID 0x3f #define REG_MOTION_BURST 0x63 // clang-format on void adns5050_init(void) { // Initialize the ADNS serial pins. setPinOutput(ADNS5050_SCLK_PIN); setPinOutput(ADNS5050_SDIO_PIN); setPinOutput(ADNS5050_CS_PIN); // reboot the adns. // if the adns hasn't initialized yet, this is harmless. adns5050_write_reg(REG_CHIP_RESET, 0x5a); // wait maximum time before adns is ready. // this ensures that the adns is actuall ready after reset. wait_ms(55); // read a burst from the adns and then discard it. // gets the adns ready for write commands // (for example, setting the dpi). adns5050_read_burst(); } // 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 adns5050_sync(void) { writePinLow(ADNS5050_CS_PIN); wait_us(1); writePinHigh(ADNS5050_CS_PIN); } void adns5050_cs_select(void) { writePinLow(ADNS5050_CS_PIN); } void adns5050_cs_deselect(void) { writePinHigh(ADNS5050_CS_PIN); } uint8_t adns5050_serial_read(void) { setPinInput(ADNS5050_SDIO_PIN); uint8_t byte = 0; for (uint8_t i = 0; i < 8; ++i) { writePinLow(ADNS5050_SCLK_PIN); wait_us(1); byte = (byte << 1) | readPin(ADNS5050_SDIO_PIN); writePinHigh(ADNS5050_SCLK_PIN); wait_us(1); } return byte; } void adns5050_serial_write(uint8_t data) { setPinOutput(ADNS5050_SDIO_PIN); for (int8_t b = 7; b >= 0; b--) { writePinLow(ADNS5050_SCLK_PIN); if (data & (1 << b)) writePinHigh(ADNS5050_SDIO_PIN); else writePinLow(ADNS5050_SDIO_PIN); wait_us(2); writePinHigh(ADNS5050_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 adns5050_read_reg(uint8_t reg_addr) { adns5050_cs_select(); adns5050_serial_write(reg_addr); // We don't need a minimum tSRAD here. That's because a 4ms wait time is // already included in adns5050_serial_write(), so we're good. // See page 10 and 15 of the ADNS spec sheet. // wait_us(4); uint8_t byte = adns5050_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); adns5050_cs_deselect(); return byte; } void adns5050_write_reg(uint8_t reg_addr, uint8_t data) { adns5050_cs_select(); adns5050_serial_write(0b10000000 | reg_addr); adns5050_serial_write(data); adns5050_cs_deselect(); } report_adns5050_t adns5050_read_burst(void) { adns5050_cs_select(); report_adns5050_t data; data.dx = 0; data.dy = 0; adns5050_serial_write(REG_MOTION_BURST); // We don't need a minimum tSRAD here. That's because a 4ms wait time is // already included in adns5050_serial_write(), so we're good. // See page 10 and 15 of the ADNS spec sheet. // wait_us(4); uint8_t x = adns5050_serial_read(); uint8_t y = adns5050_serial_read(); // Burst mode returns a bunch of other shit that we don't really need. // Setting CS to high ends burst mode early. adns5050_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 adns5050_set_cpi(uint16_t cpi) { uint8_t cpival = constrain((cpi / 125), 0x1, 0xD); // limits to 0--119 adns5050_write_reg(REG_MOUSE_CONTROL2, 0b10000 | cpival); } uint16_t adns5050_get_cpi(void) { uint8_t cpival = adns5050_read_reg(REG_MOUSE_CONTROL2); return (uint16_t)((cpival & 0b10000) * 125); } bool adns5050_check_signature(void) { uint8_t pid = adns5050_read_reg(REG_PRODUCT_ID); uint8_t rid = adns5050_read_reg(REG_REVISION_ID); uint8_t pid2 = adns5050_read_reg(REG_PRODUCT_ID2); return (pid == 0x12 && rid == 0x01 && pid2 == 0x26); }