/* 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" #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); }