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Diffstat (limited to 'keyboards/mt/split75/matrix.c')
| -rw-r--r-- | keyboards/mt/split75/matrix.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/keyboards/mt/split75/matrix.c b/keyboards/mt/split75/matrix.c new file mode 100644 index 0000000000..9e86bfc376 --- /dev/null +++ b/keyboards/mt/split75/matrix.c @@ -0,0 +1,155 @@ +/* +Copyright 2017 Luiz Ribeiro <luizribeiro@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/>. +*/ + +#include <string.h> +#include <stdio.h> +#include "quantum.h" +#include "i2c_master.h" +#include "split75.h" + +#define RIGHT_HALF + + +void matrix_set_row_status(uint8_t row); + + +#if defined(RIGHT_HALF) +#define I2C_TIMEOUT 10 +#define MCP23018_TWI_ADDRESS 0b0100000 +#define TW_READ 1 +#define TW_WRITE 0 +#define TWI_ADDR_WRITE ( (MCP23018_TWI_ADDRESS<<1) | TW_WRITE ) +#define TWI_ADDR_READ ( (MCP23018_TWI_ADDRESS<<1) | TW_READ ) +#define IODIRA 0x00 // i/o direction register +#define IODIRB 0x01 +#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 +#define MCP_ROWS_START 8 + +static uint8_t mcp23018_init(void) { + uint8_t ret; + uint8_t data[3]; + // set pin direction + // - unused : input : 1 + // - input : input : 1 + // - driving : output : 0 + data[0] = IODIRA; + data[1] = 0b00000000; // IODIRA + data[2] = (0b11111111); // IODIRB + + ret = i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)data, 3, I2C_TIMEOUT); + if (ret) goto out; // make sure we got an ACK + + // set pull-up + // - unused : on : 1 + // - input : on : 1 + // - driving : off : 0 + data[0] = GPPUA; + data[1] = 0b00000000; // IODIRA + data[2] = (0b11111111); // IODIRB + + ret = i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)data, 3, I2C_TIMEOUT); + if (ret) goto out; // make sure we got an ACK + + // set logical value (doesn't matter on inputs) + // - unused : hi-Z : 1 + // - input : hi-Z : 1 + // - driving : hi-Z : 1 + data[0] = OLATA; + data[1] = 0b11111111; // IODIRA + data[2] = (0b11111111); // IODIRB + + ret = i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)data, 3, I2C_TIMEOUT); + +out: + return ret; +} +#endif + +void matrix_init_custom(void) { + // Set rows as output starting high + DDRB = 0xFF; + PORTB = 0xFF; + + // Set columns as inputs with pull-up enabled + DDRA = 0x00; + PORTA = 0xFF; + + // Initialize i2c communication + i2c_init(); + +#if defined(RIGHT_HALF) + // Initialize the chip on the other half + mcp23018_init(); +#endif + +} + +bool matrix_scan_custom(matrix_row_t current_matrix[]) { + bool matrix_has_changed = false; + + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { + // Store last value of row prior to reading + matrix_row_t last_row_value = current_matrix[row]; + + matrix_row_t cols = 0; + // Select the row to scan + matrix_set_row_status(row); + + matrix_io_delay(); + //Set the local row + +#if defined(RIGHT_HALF) + // Initialize to 0x7F in case I2C read fails, + // as 0x75 would be no keys pressed + uint8_t data = 0x7F; + // Receive the columns from right half + i2c_receive(TWI_ADDR_WRITE, &data, 1, I2C_TIMEOUT); +#endif + + cols |= ((~(PINA | 0x80)) & 0x7F); +#if defined(RIGHT_HALF) + cols |= (((~(data | 0x80)) & 0x7F) << 7); +#endif + + current_matrix[row] = cols; + matrix_has_changed |= (last_row_value != current_matrix[row]); + } + + return matrix_has_changed; +} + +void matrix_set_row_status(uint8_t row) { +#if defined(RIGHT_HALF) + uint8_t txdata[3]; + + //Set the remote row on port A + txdata[0] = (GPIOA); + txdata[1] = ( 0xFF & ~(1<<row) ); + i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)txdata, 2, I2C_TIMEOUT); +#endif + + //Set the local row on port B + DDRB = (1 << row); + PORTB = ~(1 << row); +} |