--- /dev/null
+/* Copyright (C) 2014 by Jacob Alexander
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// ----- Includes -----
+
+// Compiler Includes
+#include <Lib/ScanLib.h>
+
+// Project Includes
+#include <cli.h>
+#include <led.h>
+#include <print.h>
+#include <macro.h>
+
+// Local Includes
+#include "matrix_scan.h"
+
+// Matrix Configuration
+#include <matrix.h>
+
+
+
+// ----- Variables -----
+
+// Debounce Array
+KeyState Matrix_scanArray[ Matrix_colsNum * Matrix_rowsNum ];
+
+
+
+// ----- Functions -----
+
+// Pin action (Strobe, Sense, Strobe Setup, Sense Setup)
+// NOTE: This function is highly dependent upon the organization of the register map
+// Only guaranteed to work with Freescale MK20 series uCs
+uint8_t Matrix_pin( GPIO_Pin gpio, Type type )
+{
+ // Register width is defined as size of a pointer
+ uint8_t port_offset = (uint8_t)gpio.port * sizeof(unsigned int*);
+
+ // Assumes 6 registers between GPIO Port registers
+ volatile unsigned int GPIO_PDDR = *(&GPIOA_PDDR + port_offset * 6);
+ volatile unsigned int GPIO_PSOR = *(&GPIOA_PSOR + port_offset * 6);
+ volatile unsigned int GPIO_PCOR = *(&GPIOA_PCOR + port_offset * 6);
+ volatile unsigned int GPIO_PDIR = *(&GPIOA_PDIR + port_offset * 6);
+
+ // Assumes 35 registers between PORT pin registers
+ volatile unsigned int PORT_PCR = *(&PORTA_PCR0 + port_offset * 35);
+
+ // Operation depends on Type
+ switch ( type )
+ {
+ case Type_StrobeOn:
+ GPIO_PSOR |= (1 << gpio.pin);
+ break;
+
+ case Type_StrobeOff:
+ GPIO_PCOR |= (1 << gpio.pin);
+ break;
+
+ case Type_StrobeSetup:
+ // Set as output pin
+ GPIO_PDDR |= (1 << gpio.pin);
+
+ // Configure pin with slow slew, high drive strength and GPIO mux
+ PORT_PCR = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(1);
+
+ // Enabling open-drain if specified
+ switch ( Matrix_type )
+ {
+ case Config_Opendrain:
+ PORT_PCR |= PORT_PCR_ODE;
+ break;
+
+ // Do nothing otherwise
+ default:
+ break;
+ }
+ break;
+
+ case Type_Sense:
+ return GPIO_PDIR & (1 << gpio.pin) ? 1 : 0;
+
+ case Type_SenseSetup:
+ // Set as input pin
+ GPIO_PDDR &= ~(1 << gpio.pin);
+
+ // Configure pin with passive filter and GPIO mux
+ PORT_PCR = PORT_PCR_PFE | PORT_PCR_MUX(1);
+
+ // Pull resistor config
+ switch ( Matrix_type )
+ {
+ case Config_Pullup:
+ PORT_PCR |= PORT_PCR_PE | PORT_PCR_PS;
+ break;
+
+ case Config_Pulldown:
+ PORT_PCR |= PORT_PCR_PE;
+ break;
+
+ // Do nothing otherwise
+ default:
+ break;
+ }
+ break;
+ }
+
+ return 0;
+}
+
+// Setup GPIO pins for matrix scanning
+void Matrix_setup()
+{
+ // Setup Strobe Pins
+ for ( uint8_t pin = 0; pin < Matrix_colsNum; pin++ )
+ {
+ Matrix_pin( Matrix_cols[ pin ], Type_StrobeSetup );
+ }
+
+ // Setup Sense Pins
+ for ( uint8_t pin = 0; pin < Matrix_rowsNum; pin++ )
+ {
+ Matrix_pin( Matrix_rows[ pin ], Type_SenseSetup );
+ }
+
+ // Clear out Debounce Array
+ for ( uint8_t item = 0; item < Matrix_maxKeys; item++ )
+ {
+ Matrix_scanArray[ item ].prevState = KeyState_Off;
+ Matrix_scanArray[ item ].curState = KeyState_Off;
+ Matrix_scanArray[ item ].activeCount = 0;
+ Matrix_scanArray[ item ].inactiveCount = 0;
+ }
+}
+
+// Scan the matrix for keypresses
+// NOTE: firstScan should be set on the first scan after a USB send (to reset all the counters)
+void Matrix_scan( uint16_t scanNum, uint8_t firstScan )
+{
+ // For each strobe, scan each of the sense pins
+ for ( uint8_t strobe = 0; strobe < Matrix_colsNum; strobe++ )
+ {
+ // Strobe Pin
+ Matrix_pin( Matrix_cols[ strobe ], Type_StrobeOn );
+
+ // Scan each of the sense pins
+ for ( uint8_t sense = 0; sense < Matrix_rowsNum; sense++ )
+ {
+ // Key position
+ uint8_t key = Matrix_rowsNum * strobe + sense;
+ KeyState *state = &Matrix_scanArray[ key ];
+
+ // If first scan, reset state
+ if ( firstScan )
+ {
+ // Set previous state, and reset current state
+ state->prevState = state->curState;
+ state->curState = KeyState_Invalid;
+ }
+
+ // Signal Detected
+ if ( Matrix_pin( Matrix_rows[ sense ], Type_Sense ) )
+ {
+ // Only update if not going to wrap around
+ state->activeCount += state->activeCount < 255 ? 1 : 0;
+ state->inactiveCount -= state->inactiveCount > 0 ? 1 : 0;
+ }
+ // Signal Not Detected
+ else
+ {
+ // Only update if not going to wrap around
+ state->inactiveCount += state->inactiveCount < 255 ? 1 : 0;
+ state->activeCount -= state->activeCount > 0 ? 1 : 0;
+ }
+
+ // Check for state change if it hasn't been set
+ // Only check if the minimum number of scans has been met
+ // the current state is invalid
+ // and either active or inactive count is over the debounce threshold
+ if ( scanNum > DEBOUNCE_THRESHOLD
+ && state->curState != KeyState_Invalid
+ && ( state->activeCount > DEBOUNCE_THRESHOLD || state->inactiveCount > DEBOUNCE_THRESHOLD ) )
+ {
+ switch ( state->prevState )
+ {
+ case KeyState_Press:
+ case KeyState_Hold:
+ if ( state->activeCount > DEBOUNCE_THRESHOLD )
+ {
+ state->curState = KeyState_Hold;
+ }
+ else
+ {
+ state->curState = KeyState_Release;
+ }
+ break;
+
+ case KeyState_Release:
+ case KeyState_Off:
+ if ( state->activeCount > DEBOUNCE_THRESHOLD )
+ {
+ state->curState = KeyState_Press;
+ }
+ else if ( state->inactiveCount > DEBOUNCE_THRESHOLD )
+ {
+ state->curState = KeyState_Off;
+ }
+ break;
+
+ case KeyState_Invalid:
+ erro_print("Matrix scan bug!! Report me!");
+ break;
+ }
+
+ // Send keystate to macro module
+ Macro_keyState( key, state->curState );
+ }
+ }
+
+ // Unstrobe Pin
+ Matrix_pin( Matrix_cols[ strobe ], Type_StrobeOff );
+ }
+}
+
projects / kiibohd-controller.git / blobdiff