Ferris reorganization (#10564)

* Add my own keymap

* Layer 0: Workman
* Layer 1: RSTHD (my own take on it)
* Layer 2: Mouse
* Layer 3: Navigation
* Layer 4: Symbols right
* Layer 5: Symbols left
* Layer 6: Fn keys
* Layer 7: Numbers
* Layer 8: Vim and misceallaneaous accessible from any other layer

* Move the current code to a 0.1 folder in preparation for upcoming changes

Version 0.2 is currently being prototyped and uses an arm chip which
will need its own firmware.

There is also the Ferris sweep which uses a pro-micro compatible board
which will need its own directory.

* Move Ferris out of handwired and into the light

The keyboard is now well out of the prototype phase as tens of them have
been produced and acquired by various people.

With 0.2 coming out, adoption is going to increase again as the board
will be available for sale at some recognized vendors.

Now is probably a good time to recognize its status as more than a
prototype :)

* Add code for the Ferris Sweep (a.k.a cradio)

The Ferris Sweep is a creation of the talented @davidphilipbarr, a.k.a DPB.
It has the key layout of a Ferris and uses a pro-micro connected to the
switches via direct pins so that diodes are not needed and the soldering
is minimal.

With their blessing, I took the code for it from DPB's own repo:
https://github.com/davidphilipbarr/36keys/tree/master/qmk/cradio
and did some adaptations such as removing commented out code, enabling
EE_HANDS and mouse keys for consistency with my existing Ferris code.

* Fix indentation in rules.mk

* Fix indentation in sweep's config

* Remove unnecessary lines from sweep's rules.mk

* Remove unnecessary lines from sweep's rules.mk

* Rename 0.1 to 0_1

This avoids the dot looking like the separation between a filename and
its extension.

In the same commit, bring matrix.c to the 0_1 folder as this was needed
for the code to compile properly (matrix.c is referred to in the readme
under `0_1` and is specific to that revision of the firmware).

* Update copyright statements for Sweep

1 files changed, 282 insertions, 0 deletions

diff --git a/keyboards/ferris/0_1/matrix.c b/keyboards/ferris/0_1/matrix.c
new file mode 100644
index 0000000000..e13c35d358
--- /dev/null
+++ b/keyboards/ferris/0_1/matrix.c
@@ -0,0 +1,282 @@
+/*
+Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>
+          2020 Pierre Chevalier <pierrechevalier83@gmail.com>
+
+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/>.
+*/
+
+/*
+ * This code was heavily inspired by the ergodox_ez keymap, and modernized
+ * to take advantage of the quantum.h microcontroller agnostics gpio control
+ * abstractions and use the macros defined in config.h for the wiring as opposed
+ * to repeating that information all over the place.
+ */
+
+#include QMK_KEYBOARD_H
+#include "i2c_master.h"
+
+extern i2c_status_t mcp23017_status;
+#define I2C_TIMEOUT 1000
+
+// For a better understanding of the i2c protocol, this is a good read:
+// https://www.robot-electronics.co.uk/i2c-tutorial
+
+// I2C address:
+// See the datasheet, section 3.3.1 on addressing I2C devices and figure 3-6 for an
+// illustration
+// http://ww1.microchip.com/downloads/en/devicedoc/20001952c.pdf
+// All address pins of the mcp23017 are connected to the ground on the ferris
+// | 0  | 1  | 0  | 0  | A2 | A1 | A0 |
+// | 0  | 1  | 0  | 0  | 0  | 0  | 0  |
+#define I2C_ADDR 0b0100000
+#define I2C_ADDR_WRITE ((I2C_ADDR << 1) | I2C_WRITE)
+#define I2C_ADDR_READ ((I2C_ADDR << 1) | I2C_READ)
+
+// Register addresses
+// See https://github.com/adafruit/Adafruit-MCP23017-Arduino-Library/blob/master/Adafruit_MCP23017.h
+#define IODIRA 0x00  // i/o direction register
+#define IODIRB 0x01
+#define GPPUA 0x0C  // GPIO pull-up resistor register
+#define GPPUB 0x0D
+#define GPIOA 0x12  // general purpose i/o port register (write modifies OLAT)
+#define GPIOB 0x13
+#define OLATA 0x14  // output latch register
+#define OLATB 0x15
+
+bool         i2c_initialized = 0;
+i2c_status_t mcp23017_status = I2C_ADDR;
+
+uint8_t init_mcp23017(void) {
+    print("starting init");
+    mcp23017_status = I2C_ADDR;
+
+    // I2C subsystem
+    if (i2c_initialized == 0) {
+        i2c_init();  // on pins D(1,0)
+        i2c_initialized = true;
+        wait_ms(I2C_TIMEOUT);
+    }
+
+    // set pin direction
+    // - unused  : input  : 1
+    // - input   : input  : 1
+    // - driving : output : 0
+    mcp23017_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
+    if (mcp23017_status) goto out;
+    mcp23017_status = i2c_write(IODIRA, I2C_TIMEOUT);
+    if (mcp23017_status) goto out;
+    // This means: we will read all the bits on GPIOA
+    mcp23017_status = i2c_write(0b11111111, I2C_TIMEOUT);
+    if (mcp23017_status) goto out;
+    // This means: we will write to the pins 0-4 on GPIOB (in select_rows)
+    mcp23017_status = i2c_write(0b11110000, I2C_TIMEOUT);
+    if (mcp23017_status) goto out;
+    i2c_stop();
+
+    // set pull-up
+    // - unused  : on  : 1
+    // - input   : on  : 1
+    // - driving : off : 0
+    mcp23017_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
+    if (mcp23017_status) goto out;
+    mcp23017_status = i2c_write(GPPUA, I2C_TIMEOUT);
+    if (mcp23017_status) goto out;
+    // This means: we will read all the bits on GPIOA
+    mcp23017_status = i2c_write(0b11111111, I2C_TIMEOUT);
+    if (mcp23017_status) goto out;
+    // This means: we will write to the pins 0-4 on GPIOB (in select_rows)
+    mcp23017_status = i2c_write(0b11110000, I2C_TIMEOUT);
+    if (mcp23017_status) goto out;
+
+out:
+    i2c_stop();
+    return mcp23017_status;
+}
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];      // debounced values
+
+static matrix_row_t read_cols(uint8_t row);
+static void         init_cols(void);
+static void         unselect_rows(void);
+static void         select_row(uint8_t row);
+
+static uint8_t mcp23017_reset_loop;
+
+void matrix_init_custom(void) {
+    // initialize row and col
+
+    mcp23017_status = init_mcp23017();
+
+    unselect_rows();
+    init_cols();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        matrix[i]     = 0;
+    }
+}
+
+void matrix_power_up(void) {
+    mcp23017_status = init_mcp23017();
+
+    unselect_rows();
+    init_cols();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        matrix[i] = 0;
+    }
+}
+
+// Reads and stores a row, returning
+// whether a change occurred.
+static inline bool store_matrix_row(matrix_row_t current_matrix[], uint8_t index) {
+    matrix_row_t temp = read_cols(index);
+    if (current_matrix[index] != temp) {
+        current_matrix[index] = temp;
+        return true;
+    }
+    return false;
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    if (mcp23017_status) {  // if there was an error
+        if (++mcp23017_reset_loop == 0) {
+            // if (++mcp23017_reset_loop >= 1300) {
+            // since mcp23017_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
+            // this will be approx bit more frequent than once per second
+            dprint("trying to reset mcp23017\n");
+            mcp23017_status = init_mcp23017();
+            if (mcp23017_status) {
+                dprint("right side not responding\n");
+            } else {
+                dprint("right side attached\n");
+            }
+        }
+    }
+
+    bool changed = false;
+    for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
+        // select rows from left and right hands
+        uint8_t left_index  = i;
+        uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
+        select_row(left_index);
+        select_row(right_index);
+
+        // we don't need a 30us delay anymore, because selecting a
+        // left-hand row requires more than 30us for i2c.
+
+        changed |= store_matrix_row(current_matrix, left_index);
+        changed |= store_matrix_row(current_matrix, right_index);
+
+        unselect_rows();
+    }
+
+    return changed;
+}
+
+static void init_cols(void) {
+    // init on mcp23017
+    // not needed, already done as part of init_mcp23017()
+
+    // init on mcu
+    pin_t matrix_col_pins_mcu[MATRIX_COLS_PER_SIDE] = MATRIX_COL_PINS_MCU;
+    for (int pin_index = 0; pin_index < MATRIX_COLS_PER_SIDE; pin_index++) {
+        pin_t pin = matrix_col_pins_mcu[pin_index];
+        setPinInput(pin);
+        writePinHigh(pin);
+    }
+}
+
+static matrix_row_t read_cols(uint8_t row) {
+    if (row < MATRIX_ROWS_PER_SIDE) {
+        pin_t        matrix_col_pins_mcu[MATRIX_COLS_PER_SIDE] = MATRIX_COL_PINS_MCU;
+        matrix_row_t current_row_value                         = 0;
+        // For each col...
+        for (uint8_t col_index = 0; col_index < MATRIX_COLS_PER_SIDE; col_index++) {
+            // Select the col pin to read (active low)
+            uint8_t pin_state = readPin(matrix_col_pins_mcu[col_index]);
+
+            // Populate the matrix row with the state of the col pin
+            current_row_value |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
+        }
+        return current_row_value;
+    } else {
+        if (mcp23017_status) {  // if there was an error
+            return 0;
+        } else {
+            uint8_t data    = 0;
+            mcp23017_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
+            if (mcp23017_status) goto out;
+            mcp23017_status = i2c_write(GPIOA, I2C_TIMEOUT);
+            if (mcp23017_status) goto out;
+            mcp23017_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT);
+            if (mcp23017_status) goto out;
+            mcp23017_status = i2c_read_nack(I2C_TIMEOUT);
+            if (mcp23017_status < 0) goto out;
+            // We read all the pins on GPIOA.
+            // The initial state was all ones and any depressed key at a given column for the currently selected row will have its bit flipped to zero.
+            // The return value is a row as represented in the generic matrix code were the rightmost bits represent the lower columns and zeroes represent non-depressed keys while ones represent depressed keys.
+            // Since the pins connected to eact columns are sequential, and counting from zero up (col 5 -> GPIOA0, col 6 -> GPIOA1 and so on), the only transformation needed is a bitwise not to swap all zeroes and ones.
+            data            = ~((uint8_t)mcp23017_status);
+            mcp23017_status = I2C_STATUS_SUCCESS;
+        out:
+            i2c_stop();
+            // return reverse_bits(data, MATRIX_COLS_PER_SIDE);
+            return data;
+        }
+    }
+}
+
+static void unselect_rows(void) {
+    // no need to unselect on mcp23017, because the select step sets all
+    // the other row bits high, and it's not changing to a different
+    // direction
+
+    // unselect rows on microcontroller
+    pin_t matrix_row_pins_mcu[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS_MCU;
+    for (int pin_index = 0; pin_index < MATRIX_ROWS_PER_SIDE; pin_index++) {
+        pin_t pin = matrix_row_pins_mcu[pin_index];
+        setPinInput(pin);
+        writePinLow(pin);
+    }
+}
+
+static void select_row(uint8_t row) {
+    if (row < MATRIX_ROWS_PER_SIDE) {
+        // select on atmega32u4
+        pin_t matrix_row_pins_mcu[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS_MCU;
+        pin_t pin                                       = matrix_row_pins_mcu[row];
+        setPinOutput(pin);
+        writePinLow(pin);
+    } else {
+        // select on mcp23017
+        if (mcp23017_status) {  // if there was an error
+                                // do nothing
+        } else {
+            mcp23017_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
+            if (mcp23017_status) goto out;
+            mcp23017_status = i2c_write(GPIOB, I2C_TIMEOUT);
+            if (mcp23017_status) goto out;
+            // Select the desired row by writing a byte for the entire GPIOB bus where only the bit representing the row we want to select is a zero (write instruction) and every other bit is a one.
+            // Note that the row - MATRIX_ROWS_PER_SIDE reflects the fact that being on the right hand, the columns are numbered from MATRIX_ROWS_PER_SIDE to MATRIX_ROWS, but the pins we want to write to are indexed from zero up on the GPIOB bus.
+            mcp23017_status = i2c_write(0xFF & ~(1 << (row - MATRIX_ROWS_PER_SIDE)), I2C_TIMEOUT);
+
+            if (mcp23017_status) goto out;
+        out:
+            i2c_stop();
+        }
+    }
+}