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Diffstat (limited to 'keyboards/barleycorn/matrix.c')
| -rw-r--r-- | keyboards/barleycorn/matrix.c | 138 |
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; +} |