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diff --git a/keyboards/ploopyco/pmw3600.c b/keyboards/ploopyco/pmw3600.c
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+/* Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
+ * Copyright 2019 Sunjun Kim
+ * Copyright 2020 Ploopy Corporation
+ *
+ * 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 "pmw3600.h"
+#include "pmw3600_firmware.h"
+#ifdef CONSOLE_ENABLE
+# include "print.h"
+#endif
+bool _inBurst = false;
+
+#ifndef PMW_CPI
+# define PMW_CPI 1600
+#endif
+#ifndef SPI_DIVISOR
+# define SPI_DIVISOR 2
+#endif
+
+static const int8_t ROTATIONAL_TRANSFORM_ANGLE = 20;
+
+#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
+
+
+bool spi_start_adv(void) {
+ bool status = spi_start(SPI_SS_PIN, false, 3, SPI_DIVISOR);
+ wait_us(1);
+ return status;
+}
+
+void spi_stop_adv(void) {
+ wait_us(1);
+ spi_stop();
+}
+
+spi_status_t spi_write_adv(uint8_t reg_addr, uint8_t data) {
+ if (reg_addr != REG_Motion_Burst) {
+ _inBurst = false;
+ }
+
+ spi_start_adv();
+ // send address of the register, with MSBit = 1 to indicate it's a write
+ spi_status_t status = spi_write(reg_addr | 0x80);
+ status = spi_write(data);
+
+ // tSCLK-NCS for write operation
+ wait_us(20);
+
+ // tSWW/tSWR (=120us) minus tSCLK-NCS. Could be shortened, but is looks like a safe lower bound
+ wait_us(100);
+ spi_stop();
+ return status;
+}
+
+uint8_t spi_read_adv(uint8_t reg_addr) {
+ spi_start_adv();
+ // send adress of the register, with MSBit = 0 to indicate it's a read
+ spi_write(reg_addr & 0x7f);
+
+ uint8_t data = spi_read();
+
+ // tSCLK-NCS for read operation is 120ns
+ wait_us(1);
+
+ // tSRW/tSRR (=20us) minus tSCLK-NCS
+ wait_us(19);
+
+ spi_stop();
+ return data;
+}
+
+void pmw_set_cpi(uint16_t cpi) {
+ int cpival = constrain((cpi / 100) - 1, 0, 0x77); // limits to 0--119
+
+ spi_start_adv();
+ spi_write_adv(REG_Config1, cpival);
+ spi_stop();
+}
+
+bool pmw_spi_init(void) {
+ spi_init();
+ _inBurst = false;
+
+ spi_stop();
+ spi_start_adv();
+ spi_stop();
+
+ spi_write_adv(REG_Shutdown, 0xb6); // Shutdown first
+ wait_ms(300);
+
+ spi_start_adv();
+ wait_us(40);
+ spi_stop_adv();
+ wait_us(40);
+
+ spi_write_adv(REG_Power_Up_Reset, 0x5a);
+ wait_ms(50);
+
+ spi_read_adv(REG_Motion);
+ spi_read_adv(REG_Delta_X_L);
+ spi_read_adv(REG_Delta_X_H);
+ spi_read_adv(REG_Delta_Y_L);
+ spi_read_adv(REG_Delta_Y_H);
+
+ pmw_upload_firmware();
+
+ spi_write_adv(REG_Angle_Tune, constrain(ROTATIONAL_TRANSFORM_ANGLE, -30, 30));
+ spi_stop_adv();
+
+ wait_ms(10);
+ pmw_set_cpi(PMW_CPI);
+
+ wait_ms(1);
+
+ return pmw_check_signature();
+}
+
+void pmw_upload_firmware(void) {
+ spi_write_adv(REG_Config2, 0x00);
+
+ spi_write_adv(REG_SROM_Enable, 0x1d);
+
+ wait_ms(10);
+
+ spi_write_adv(REG_SROM_Enable, 0x18);
+
+ spi_start_adv();
+ spi_write(REG_SROM_Load_Burst | 0x80);
+ wait_us(15);
+
+ unsigned char c;
+ for (int i = 0; i < firmware_length; i++) {
+ c = (unsigned char)pgm_read_byte(firmware_data + i);
+ spi_write(c);
+ wait_us(15);
+ }
+ wait_us(200);
+
+ spi_read_adv(REG_SROM_ID);
+
+ spi_write_adv(REG_Config2, 0x00);
+
+ spi_stop();
+ wait_ms(10);
+}
+
+bool pmw_check_signature(void) {
+ uint8_t pid = spi_read_adv(REG_Product_ID);
+ uint8_t iv_pid = spi_read_adv(REG_Inverse_Product_ID);
+ uint8_t SROM_ver = spi_read_adv(REG_SROM_ID);
+ return (pid == 0x42 && iv_pid == 0xBD && SROM_ver == 0x04); // signature for SROM 0x04
+}
+
+report_pmw_t pmw_read_burst(void) {
+ if (!_inBurst) {
+#ifdef CONSOLE_ENABLE
+ dprintf("burst on");
+#endif
+ spi_write_adv(REG_Motion_Burst, 0x00);
+ _inBurst = true;
+ }
+
+ spi_start_adv();
+ spi_write(REG_Motion_Burst);
+ wait_us(35); // waits for tSRAD
+
+ report_pmw_t data;
+ data.motion = 0;
+ data.dx = 0;
+ data.mdx = 0;
+ data.dy = 0;
+ data.mdx = 0;
+
+ data.motion = spi_read();
+ spi_write(0x00); // skip Observation
+ data.dx = spi_read();
+ data.mdx = spi_read();
+ data.dy = spi_read();
+ data.mdy = spi_read();
+
+ spi_stop();
+
+#ifdef CONSOLE_ENABLE
+ print_byte(data.motion);
+ print_byte(data.dx);
+ print_byte(data.mdx);
+ print_byte(data.dy);
+ print_byte(data.mdy);
+ dprintf("\n");
+#endif
+
+ data.isMotion = (data.motion & 0x80) != 0;
+ data.isOnSurface = (data.motion & 0x08) == 0;
+ data.dx |= (data.mdx << 8);
+ data.dx = data.dx * -1;
+ data.dy |= (data.mdy << 8);
+ // data.dy = data.dy * -1;
+
+ spi_stop();
+
+ if (data.motion & 0b111) { // panic recovery, sometimes burst mode works weird.
+ _inBurst = false;
+ }
+
+ return data;
+}