1 /* Copyright (C) 2014-2015 by Jacob Alexander
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 // ----- Includes -----
25 #include <Lib/ScanLib.h>
35 #include "matrix_scan.h"
37 // Matrix Configuration
42 // ----- Defines -----
44 #if ( DebounceThrottleDiv_define > 0 )
45 nat_ptr_t Matrix_divCounter = 0;
50 // ----- Function Declarations -----
53 void cliFunc_matrixDebug( char* args );
54 void cliFunc_matrixState( char* args );
58 // ----- Variables -----
60 // Scan Module command dictionary
61 CLIDict_Entry( matrixDebug, "Enables matrix debug mode, prints out each scan code." NL "\t\tIf argument \033[35mT\033[0m is given, prints out each scan code state transition." );
62 CLIDict_Entry( matrixState, "Prints out the current scan table N times." NL "\t\t \033[1mO\033[0m - Off, \033[1;33mP\033[0m - Press, \033[1;32mH\033[0m - Hold, \033[1;35mR\033[0m - Release, \033[1;31mI\033[0m - Invalid" );
64 CLIDict_Def( matrixCLIDict, "Matrix Module Commands" ) = {
65 CLIDict_Item( matrixDebug ),
66 CLIDict_Item( matrixState ),
67 { 0, 0, 0 } // Null entry for dictionary end
71 KeyState Matrix_scanArray[ Matrix_colsNum * Matrix_rowsNum ];
73 // Matrix debug flag - If set to 1, for each keypress the scan code is displayed in hex
74 // If set to 2, for each key state change, the scan code is displayed along with the state
75 uint8_t matrixDebugMode = 0;
77 // Matrix State Table Debug Counter - If non-zero display state table after every matrix scan
78 uint16_t matrixDebugStateCounter = 0;
80 // Matrix Scan Counters
81 uint16_t matrixMaxScans = 0;
82 uint16_t matrixCurScans = 0;
83 uint16_t matrixPrevScans = 0;
85 // System Timer used for delaying debounce decisions
86 extern volatile uint32_t systick_millis_count;
90 // ----- Functions -----
92 // Pin action (Strobe, Sense, Strobe Setup, Sense Setup)
93 // NOTE: This function is highly dependent upon the organization of the register map
94 // Only guaranteed to work with Freescale MK20 series uCs
95 uint8_t Matrix_pin( GPIO_Pin gpio, Type type )
97 // Register width is defined as size of a pointer
98 unsigned int gpio_offset = gpio.port * 0x40 / sizeof(unsigned int*);
99 unsigned int port_offset = gpio.port * 0x1000 / sizeof(unsigned int*) + gpio.pin;
101 // Assumes 0x40 between GPIO Port registers and 0x1000 between PORT pin registers
103 volatile unsigned int *GPIO_PDDR = (unsigned int*)(&GPIOA_PDDR) + gpio_offset;
104 volatile unsigned int *GPIO_PSOR = (unsigned int*)(&GPIOA_PSOR) + gpio_offset;
105 volatile unsigned int *GPIO_PCOR = (unsigned int*)(&GPIOA_PCOR) + gpio_offset;
106 volatile unsigned int *GPIO_PDIR = (unsigned int*)(&GPIOA_PDIR) + gpio_offset;
107 volatile unsigned int *PORT_PCR = (unsigned int*)(&PORTA_PCR0) + port_offset;
109 // Operation depends on Type
113 *GPIO_PSOR |= (1 << gpio.pin);
117 *GPIO_PCOR |= (1 << gpio.pin);
120 case Type_StrobeSetup:
122 *GPIO_PDDR |= (1 << gpio.pin);
124 // Configure pin with slow slew, high drive strength and GPIO mux
125 *PORT_PCR = PORT_PCR_SRE | PORT_PCR_DSE | PORT_PCR_MUX(1);
127 // Enabling open-drain if specified
128 switch ( Matrix_type )
130 case Config_Opendrain:
131 *PORT_PCR |= PORT_PCR_ODE;
134 // Do nothing otherwise
141 return *GPIO_PDIR & (1 << gpio.pin) ? 1 : 0;
143 case Type_SenseSetup:
145 *GPIO_PDDR &= ~(1 << gpio.pin);
147 // Configure pin with passive filter and GPIO mux
148 *PORT_PCR = PORT_PCR_PFE | PORT_PCR_MUX(1);
150 // Pull resistor config
151 switch ( Matrix_type )
154 *PORT_PCR |= PORT_PCR_PE | PORT_PCR_PS;
157 case Config_Pulldown:
158 *PORT_PCR |= PORT_PCR_PE;
161 // Do nothing otherwise
171 // Setup GPIO pins for matrix scanning
174 // Register Matrix CLI dictionary
175 CLI_registerDictionary( matrixCLIDict, matrixCLIDictName );
177 info_msg("Columns: ");
178 printHex( Matrix_colsNum );
181 for ( uint8_t pin = 0; pin < Matrix_colsNum; pin++ )
183 Matrix_pin( Matrix_cols[ pin ], Type_StrobeSetup );
188 printHex( Matrix_rowsNum );
191 for ( uint8_t pin = 0; pin < Matrix_rowsNum; pin++ )
193 Matrix_pin( Matrix_rows[ pin ], Type_SenseSetup );
197 info_msg("Max Keys: ");
198 printHex( Matrix_maxKeys );
200 // Clear out Debounce Array
201 for ( uint8_t item = 0; item < Matrix_maxKeys; item++ )
203 Matrix_scanArray[ item ].prevState = KeyState_Off;
204 Matrix_scanArray[ item ].curState = KeyState_Off;
205 Matrix_scanArray[ item ].activeCount = 0;
206 Matrix_scanArray[ item ].inactiveCount = DebounceDivThreshold_define; // Start at 'off' steady state
207 Matrix_scanArray[ item ].prevDecisionTime = 0;
210 // Clear scan stats counters
215 void Matrix_keyPositionDebug( KeyPosition pos )
217 // Depending on the state, use a different flag + color
221 print("\033[1mO\033[0m");
225 print("\033[1;33mP\033[0m");
229 print("\033[1;32mH\033[0m");
232 case KeyState_Release:
233 print("\033[1;35mR\033[0m");
236 case KeyState_Invalid:
238 print("\033[1;31mI\033[0m");
244 // Scan the matrix for keypresses
245 // NOTE: scanNum should be reset to 0 after a USB send (to reset all the counters)
246 void Matrix_scan( uint16_t scanNum )
248 #if ( DebounceThrottleDiv_define > 0 )
249 // Scan-rate throttling
250 // By scanning using a divider, the scan rate slowed down
251 // DebounceThrottleDiv_define == 1 means -> /2 or half scan rate
252 // This helps with bouncy switches on fast uCs
253 if ( !( Matrix_divCounter++ & (1 << ( DebounceThrottleDiv_define - 1 )) ) )
257 // Increment stats counters
258 if ( scanNum > matrixMaxScans ) matrixMaxScans = scanNum;
261 matrixPrevScans = matrixCurScans;
269 // Read systick for event scheduling
270 uint8_t currentTime = (uint8_t)systick_millis_count;
272 // For each strobe, scan each of the sense pins
273 for ( uint8_t strobe = 0; strobe < Matrix_colsNum; strobe++ )
276 Matrix_pin( Matrix_cols[ strobe ], Type_StrobeOn );
278 // Scan each of the sense pins
279 for ( uint8_t sense = 0; sense < Matrix_rowsNum; sense++ )
282 uint8_t key = Matrix_colsNum * sense + strobe;
283 KeyState *state = &Matrix_scanArray[ key ];
285 // If first scan, reset state
288 // Set previous state, and reset current state
289 state->prevState = state->curState;
290 state->curState = KeyState_Invalid;
294 // Increment count and right shift opposing count
295 // This means there is a maximum of scan 13 cycles on a perfect off to on transition
296 // (coming from a steady state 0xFFFF off scans)
297 // Somewhat longer with switch bounciness
298 // The advantage of this is that the count is ongoing and never needs to be reset
299 // State still needs to be kept track of to deal with what to send to the Macro module
300 if ( Matrix_pin( Matrix_rows[ sense ], Type_Sense ) )
302 // Only update if not going to wrap around
303 if ( state->activeCount < DebounceDivThreshold_define ) state->activeCount += 1;
304 state->inactiveCount >>= 1;
306 // Signal Not Detected
309 // Only update if not going to wrap around
310 if ( state->inactiveCount < DebounceDivThreshold_define ) state->inactiveCount += 1;
311 state->activeCount >>= 1;
314 // Check for state change if it hasn't been set
315 // But only if enough time has passed since last state change
316 // Only check if the minimum number of scans has been met
317 // the current state is invalid
318 // and either active or inactive count is over the debounce threshold
319 if ( state->curState == KeyState_Invalid )
321 // Determine time since last decision
322 uint8_t lastTransition = currentTime - state->prevDecisionTime;
324 // Attempt state transition
325 switch ( state->prevState )
329 if ( state->activeCount > state->inactiveCount )
331 state->curState = KeyState_Hold;
335 // If not enough time has passed since Hold
336 // Keep previous state
337 if ( lastTransition < MinDebounceTime_define )
339 //warn_print("FAST Release stopped");
340 state->curState = state->prevState;
344 state->curState = KeyState_Release;
348 case KeyState_Release:
350 if ( state->activeCount > state->inactiveCount )
352 // If not enough time has passed since Hold
353 // Keep previous state
354 if ( lastTransition < MinDebounceTime_define )
356 //warn_print("FAST Press stopped");
357 state->curState = state->prevState;
361 state->curState = KeyState_Press;
365 state->curState = KeyState_Off;
369 case KeyState_Invalid:
371 erro_print("Matrix scan bug!! Report me!");
375 // Update decision time
376 state->prevDecisionTime = currentTime;
378 // Send keystate to macro module
379 Macro_keyState( key, state->curState );
381 // Matrix Debug, only if there is a state change
382 if ( matrixDebugMode && state->curState != state->prevState )
384 // Basic debug output
385 if ( matrixDebugMode == 1 && state->curState == KeyState_Press )
390 // State transition debug output
391 else if ( matrixDebugMode == 2 )
394 Matrix_keyPositionDebug( state->curState );
402 Matrix_pin( Matrix_cols[ strobe ], Type_StrobeOff );
405 // State Table Output Debug
406 if ( matrixDebugStateCounter > 0 )
409 matrixDebugStateCounter--;
411 // Output stats on number of scans being done per USB send
413 info_msg("Max scans: ");
414 printHex( matrixMaxScans );
416 info_msg("Previous scans: ");
417 printHex( matrixPrevScans );
420 // Output current scan number
421 info_msg("Scan Number: ");
425 // Display the state info for each key
426 print("<key>:<previous state><current state> <active count> <inactive count>");
427 for ( uint8_t key = 0; key < Matrix_maxKeys; key++ )
429 // Every 4 keys, put a newline
434 printHex_op( key, 2 );
437 Matrix_keyPositionDebug( Matrix_scanArray[ key ].prevState );
438 Matrix_keyPositionDebug( Matrix_scanArray[ key ].curState );
440 printHex_op( Matrix_scanArray[ key ].activeCount, 4 );
442 printHex_op( Matrix_scanArray[ key ].inactiveCount, 4 );
451 // ----- CLI Command Functions -----
453 void cliFunc_matrixDebug ( char* args )
455 // Parse number from argument
456 // NOTE: Only first argument is used
459 CLI_argumentIsolation( args, &arg1Ptr, &arg2Ptr );
461 // Set the matrix debug flag depending on the argument
462 // If no argument, set to scan code only
463 // If set to T, set to state transition
464 switch ( arg1Ptr[0] )
469 matrixDebugMode = matrixDebugMode != 2 ? 2 : 0;
474 matrixDebugMode = matrixDebugMode != 1 ? 1 : 0;
483 info_msg("Matrix Debug Mode: ");
484 printInt8( matrixDebugMode );
487 void cliFunc_matrixState ( char* args )
489 // Parse number from argument
490 // NOTE: Only first argument is used
493 CLI_argumentIsolation( args, &arg1Ptr, &arg2Ptr );
495 // Default to 1 if no argument is given
496 matrixDebugStateCounter = 1;
498 if ( arg1Ptr[0] != '\0' )
500 matrixDebugStateCounter = (uint16_t)numToInt( arg1Ptr );