1 files changed, 193 insertions, 0 deletions
diff --git a/drivers/sensors/adns5050.c b/drivers/sensors/adns5050.c
new file mode 100644
index 0000000000..e7273977d5
--- /dev/null
+++ b/drivers/sensors/adns5050.c
@@ -0,0 +1,193 @@
+/* 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);
+}