3322844ed0
before, if you pressed a key, then shifted layers, then released it, the first layer's press() would be called, and the 2nd layer's release() would be called, causing keys to stick, and probably other errors. now, the layer that the key was on when it was pressed is kept track of, and the proper release() is called. also, layers can be shifted per key now, instead of just for the whole board at once i also changed how keyboard-private includes are handled. "private" stuff is now in its own file, instead of being nested in an extra `#ifdef`. and i think that's it. i'm pretty tired right now, so there may be errors, but it seemed to work all right with cursory tests.
144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/* ----------------------------------------------------------------------------
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* ergoDOX controller: MCP23018 specific code
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* ----------------------------------------------------------------------------
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* Copyright (c) 2012 Ben Blazak <benblazak.dev@gmail.com>
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* Released under The MIT License (MIT) (see "license.md")
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* Project located at <https://github.com/benblazak/ergodox-firmware>
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* ------------------------------------------------------------------------- */
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#include <util/twi.h>
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#include "lib/data-types.h"
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#include "lib/twi.h" // `TWI_FREQ` defined in "teensy-2-0.c"
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#include "matrix.h"
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#include "mcp23018--private.h"
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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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// 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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/* returns:
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* - success: 0
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* - failure: twi status code
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*
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* notes:
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* - `twi_stop()` must be called *exactly once* for each twi block, the way
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* things are currently set up. this may change in the future.
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*/
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uint8_t mcp23018_init(void) {
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uint8_t ret;
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// set pin direction
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// - unused : input : 1
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// - row : input : 1
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// - column : output : 0
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twi_start();
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ret = twi_send(TWI_ADDR_WRITE);
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if (ret) goto out; // make sure we got an ACK
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twi_send(IODIRA);
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twi_send(0b11111111); // IODIRA
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twi_send(0b10000000); // IODIRB
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twi_stop();
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// set pull-up
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// - unused : on : 1
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// - rows : on : 1
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// - columns : off : 0
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twi_start();
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ret = twi_send(TWI_ADDR_WRITE);
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if (ret) goto out; // make sure we got an ACK
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twi_send(GPPUA);
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twi_send(0b11111111); // GPPUA
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twi_send(0b10000000); // GPPUB
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twi_stop();
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// set logical value (doesn't matter on inputs)
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// - unused : high (hi-Z) : 1
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// - rows : high (hi-Z) : 1
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// - columns : high (hi-Z) : 1
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twi_start();
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ret = twi_send(TWI_ADDR_WRITE);
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if (ret) goto out; // make sure we got an ACK
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twi_send(OLATA);
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twi_send(0b11111111); //OLATA
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twi_send(0b11111111); //OLATB
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out:
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twi_stop();
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return ret;
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}
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/* returns:
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* - success: 0
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* - failure: twi status code
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*/
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#if KB_ROWS != 12 || KB_COLUMNS != 7
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#error "Expecting different keyboard dimensions"
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#endif
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uint8_t mcp23018_update_matrix(bool matrix[KB_ROWS][KB_COLUMNS]) {
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uint8_t ret, data;
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// initialize things, just to make sure
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// - it's not appreciably faster to skip this, and it takes care of the
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// case when the i/o expander isn't plugged in during the first
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// init()
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ret = mcp23018_init();
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// if there was an error
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if (ret) {
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// clear our part of the matrix
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for (uint8_t row=0x6; row<=0xB; row++)
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for (uint8_t col=0; col<=6; col++)
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matrix[row][col] = 0;
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return ret;
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}
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// update our part of the matrix
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for (uint8_t col=0; col<=6; col++) {
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// set active column low : 0
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// set other columns high (hi-Z) : 1
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twi_start();
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twi_send(TWI_ADDR_WRITE);
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twi_send(OLATB);
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twi_send( 0xFF & ~(1<<col) );
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twi_stop();
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// read row data
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twi_start();
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twi_send(TWI_ADDR_WRITE);
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twi_send(GPIOA);
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twi_start();
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twi_send(TWI_ADDR_READ);
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twi_read(&data);
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twi_stop();
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// update matrix
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for (uint8_t row=0x6; row<=0xB; row++)
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matrix[row][col] = !( data & (1<<(row-6)) );
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}
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// set all columns high (hi-Z) : 1
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twi_start();
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twi_send(TWI_ADDR_WRITE);
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twi_send(GPIOB);
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twi_send(0xFF);
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twi_stop();
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return ret; // success
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}
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