|
|
- /*
- 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 "split78.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
-
- }
-
- static i2c_status_t mcp23018_status = I2C_STATUS_SUCCESS;
-
- bool matrix_scan_custom(matrix_row_t current_matrix[]) {
- bool matrix_has_changed = false;
-
- #if defined(RIGHT_HALF)
- if (mcp23018_status != I2C_STATUS_SUCCESS) {
- mcp23018_status = mcp23018_init();
- }
- #endif
-
- 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
- if (mcp23018_status == I2C_STATUS_SUCCESS) {
- mcp23018_status = 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) );
- if (mcp23018_status == I2C_STATUS_SUCCESS) {
- mcp23018_status = 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);
- }
|