[Keyboard] Barleycorn (#10118)

* Initial commit

* Barleycorn rename

* Update readme.md

* PR checklist fixes

* Update info.json

* Update keyboards/barleycorn/rules.mk

* Update keyboards/barleycorn/config.h

* Update keyboards/barleycorn/rules.mk

* Update keyboards/barleycorn/config.h

* Update keyboards/barleycorn/info.json

* Update keyboards/barleycorn/info.json

* Update keyboards/barleycorn/readme.md

* Update keyboards/barleycorn/rules.mk

* Update keyboards/barleycorn/rules.mk

* PR review

* Update keyboards/barleycorn/readme.md

* Update keyboards/barleycorn/rules.mk

* Update keyboards/barleycorn/keymaps/default/readme.md

* Update keyboards/barleycorn/keymaps/iso/readme.md

* Update keyboards/barleycorn/rules.mk

* Update keyboards/barleycorn/readme.md

* Update keyboards/barleycorn/rules.mk

* Update keyboards/barleycorn/matrix.c

* Update keyboards/barleycorn/barleycorn.c

* added ansi/iso keymaps!

* Update keyboards/barleycorn/info.json

1 files changed, 138 insertions, 0 deletions

diff --git a/keyboards/barleycorn/matrix.c b/keyboards/barleycorn/matrix.c
new file mode 100644
index 0000000000..99366d6098
--- /dev/null
+++ b/keyboards/barleycorn/matrix.c
@@ -0,0 +1,138 @@
+/*
+Copyright 2012-2020 Jun Wako, Jack Humbert, Yiancar
+
+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 <stdint.h>
+#include <stdbool.h>
+#include "wait.h"
+#include "quantum.h"
+#include "i2c_master.h"
+
+static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
+
+static void unselect_rows(void) {
+    for(uint8_t x = 0; x < MATRIX_ROWS; x++) {
+        setPinInputHigh(row_pins[x]);
+    }
+}
+
+static void select_row(uint8_t row) {
+    setPinOutput(row_pins[row]);
+    writePinLow(row_pins[row]);
+}
+
+static void unselect_row(uint8_t row) {
+    setPinInputHigh(row_pins[row]);
+}
+
+static void init_pins(void) {
+    unselect_rows();
+    // Set I/O
+    uint8_t send_data[2] = { 0xFF, 0x03};
+    i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x00, &send_data[0], 2, 20);
+    // Set Pull-up
+    i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x0C, &send_data[0], 2, 20);
+
+    for (uint8_t x = 0; x < MATRIX_COLS; x++) {
+        if ( x < 8 ) {
+            setPinInputHigh(col_pins[x]);
+        }
+    }
+}
+
+void matrix_init_custom(void) {
+    // TODO: initialize hardware here
+    // Initialize I2C
+    i2c_init();
+
+    // initialize key pins
+    init_pins();
+    wait_ms(50);
+}
+
+static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
+    // Store last value of row prior to reading
+    matrix_row_t last_row_value = current_matrix[current_row];
+
+    // Clear data in matrix row
+    current_matrix[current_row] = 0;
+
+    // Select row and wait for row selecton to stabilize
+    select_row(current_row);
+    matrix_io_delay();
+
+    uint8_t port_expander_col_buffer[2];
+    i2c_readReg((PORT_EXPANDER_ADDRESS << 1), 0x12, &port_expander_col_buffer[0], 2, 20);
+
+    // For each col...
+    for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
+        uint8_t pin_state;
+        // Select the col pin to read (active low)
+        switch (col_index) {
+            case 8 :
+                pin_state = port_expander_col_buffer[0] & (1 << 0);
+                break;
+            case 9 :
+                pin_state = port_expander_col_buffer[0] & (1 << 1);
+                break;
+            case 10 :
+                pin_state = port_expander_col_buffer[0] & (1 << 2);
+                break;
+            case 11 :
+                pin_state = port_expander_col_buffer[0] & (1 << 3);
+                break;
+            case 12 :
+                pin_state = port_expander_col_buffer[0] & (1 << 4);
+                break;
+            case 13 :
+                pin_state = port_expander_col_buffer[0] & (1 << 5);
+                break;
+            case 14 :
+                pin_state = port_expander_col_buffer[0] & (1 << 6);
+                break;
+            case 15 :
+                pin_state = port_expander_col_buffer[0] & (1 << 7);
+                break;
+            case 16 :
+                pin_state = port_expander_col_buffer[1] & (1 << 0);
+                break;
+            case 17 :
+                pin_state = port_expander_col_buffer[1] & (1 << 1);
+                break;
+            default :
+                pin_state = readPin(col_pins[col_index]);
+        }
+
+        // Populate the matrix row with the state of the col pin
+        current_matrix[current_row] |=  pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
+    }
+
+    // Unselect row
+    unselect_row(current_row);
+
+    return (last_row_value != current_matrix[current_row]);
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    bool matrix_has_changed = false;
+
+    // Set row, read cols
+    for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+        matrix_has_changed |= read_cols_on_row(current_matrix, current_row);
+    }
+
+    return matrix_has_changed;
+}