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191 lines
5.2 KiB
191 lines
5.2 KiB
/*
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Copyright 2021 MajorKoos <github.com/majorkoos>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <stdio.h>
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#include "quantum.h"
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#include "i2c_master.h"
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#define RIGHT_HALF
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void matrix_set_row_status(uint8_t row);
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#if defined(RIGHT_HALF)
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/* ----------------------- hardware I/O abstraction ------------------------ */
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#define PORTCOLUMNS PORTB ///< port on which we read the state of the columns
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#define PINCOLUMNS PINB ///< port on which we read the state of the columns
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#define DDRCOLUMNS DDRB ///< port on which we read the state of the columns
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#define PORTROWS1 PORTA ///< first port connected to the matrix rows
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#define PINROWS1 PINA ///< first port connected to the matrix rows
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#define DDRROWS1 DDRA ///< first port connected to the matrix rows
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#define PORTROWS2 PORTC ///< second port connected to the matrix rows
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#define PINROWS2 PINC ///< second port connected to the matrix rows
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#define DDRROWS2 DDRC ///< second port connected to the matrix rows
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// register addresses (see "mcp23018.md")
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#define IODIRA 0x00 // i/o direction register
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#define IODIRB 0x01
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#define GPPUA 0x0C // GPIO pull-up resistor register
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#define GPPUB 0x0D
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#define GPIOA 0x12 // general purpose i/o port register (write modifies OLAT)
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#define GPIOB 0x13
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#define OLATA 0x14 // output latch register
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#define OLATB 0x15
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#define TW_READ 1
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#define TW_WRITE 0
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#define MCP23018_TWI_ADDRESS 0b0100000
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// TWI aliases
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#define TWI_ADDR_WRITE ( (MCP23018_TWI_ADDRESS<<1) | TW_WRITE )
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#define TWI_ADDR_READ ( (MCP23018_TWI_ADDRESS<<1) | TW_READ )
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#define I2C_TIMEOUT 10
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#define MCP_ROWS_START 8
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uint8_t mcp23018_init(void) {
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uint8_t ret;
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uint8_t data[3];
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// set pin direction
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// - unused : input : 1
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// - input : input : 1
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// - driving : output : 0
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data[0] = IODIRA;
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data[1] = 0b00000000; // IODIRA
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data[2] = (0b11111111); // IODIRB
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ret = i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)data, 3, I2C_TIMEOUT);
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if (ret) goto out; // make sure we got an ACK
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// set pull-up
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// - unused : on : 1
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// - input : on : 1
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// - driving : off : 0
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data[0] = GPPUA;
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data[1] = 0b00000000; // IODIRA
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data[2] = (0b11111111); // IODIRB
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ret = i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)data, 3, I2C_TIMEOUT);
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if (ret) goto out; // make sure we got an ACK
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// set logical value (doesn't matter on inputs)
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// - unused : hi-Z : 1
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// - input : hi-Z : 1
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// - driving : hi-Z : 1
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data[0] = OLATA;
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data[1] = 0b11111111; // IODIRA
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data[2] = (0b11111111); // IODIRB
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ret = i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)data, 3, I2C_TIMEOUT);
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out:
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return ret;
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}
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#endif
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void matrix_init_custom(void) {
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// initialize matrix ports - cols, rows
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// PB0-PB7 : col0 .. col7
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// PA0-PA7 : row0 .. row7
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// PC7-PC2 : row8 .. row13
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// PD0 : NUM
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// PD1 : CAPS
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// PD2 : D+ / Clock
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// PD3 : D- / Data
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// PD4 : FULL LED
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// PD5 : 3.6V switch TR
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// PD6 : SCRL
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// PD7 : row14
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// signal direction : col -> row
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// pc(PORTROWS1)0, 1 : twi
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DDRCOLUMNS = 0xFF; // all outputs for cols
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PORTCOLUMNS = 0xFF; // high
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// all inputs for rows
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DDRROWS1 = 0x00;
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DDRROWS2 &= ~(0x111111<<2); //0x00;
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DDRD &= ~(1<<PIND7); // row 14
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// all rows pull-up.
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PORTROWS1 = 0xFF;
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PORTROWS2 |= (0b111111<<2); //0x11111100;
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PORTD |= (1<<PIND7);// row 14
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i2c_init();
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#if defined(RIGHT_HALF)
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// Initialize the chip on the other half
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mcp23018_init();
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#endif
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool matrix_has_changed = false;
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[row];
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matrix_row_t cols = 0;
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// Select the row to scan
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matrix_set_row_status(row);
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matrix_io_delay();
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//Set the local row
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#if defined(RIGHT_HALF)
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// Initialize to 0x7F in case I2C read fails,
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// as 0x75 would be no keys pressed
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uint8_t data = 0x7F;
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// Receive the columns from right half
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i2c_receive(TWI_ADDR_WRITE, &data, 1, I2C_TIMEOUT);
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#endif
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// cols |= ((~(PINA | 0x80)) & 0x7F);
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cols |= ((~(PINA)) & 0xFF);
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#if defined(RIGHT_HALF)
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cols |= (((~(data | 0x80)) & 0x7F) << MCP_ROWS_START);
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#endif
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current_matrix[row] = cols;
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matrix_has_changed |= (last_row_value != current_matrix[row]);
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}
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return matrix_has_changed;
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}
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void matrix_set_row_status(uint8_t row) {
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#if defined(RIGHT_HALF)
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uint8_t txdata[3];
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//Set the remote row on port A
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txdata[0] = (GPIOA);
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txdata[1] = ( 0xFF & ~(1<<row) );
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i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)txdata, 2, I2C_TIMEOUT);
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#endif
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//Set the local row on port B
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DDRB = (1 << row);
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PORTB = ~(1 << row);
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}
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