diff options
author | Zach White <skullydazed@gmail.com> | 2021-07-14 10:30:28 -0700 |
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committer | Zach White <skullydazed@gmail.com> | 2021-07-14 10:30:28 -0700 |
commit | 44d322623eb875f6eb2e0a317c76af2d47f7a9dc (patch) | |
tree | ab722bcc4cea4e4ed16f0a5dce0602fe1f2c63e5 /keyboards/handwired/symmetric70_proto/matrix_debug | |
parent | 52cfc9259b58a3a11a244fbe35c49c7dd1a9cae0 (diff) | |
parent | ffdfe3798bc7bd374991abe8f10494f2e73aedd5 (diff) |
Merge remote-tracking branch 'origin/master' into develop
Resolved Conflicts:
keyboards/checkerboards/nop60/info.json
Diffstat (limited to 'keyboards/handwired/symmetric70_proto/matrix_debug')
3 files changed, 534 insertions, 0 deletions
diff --git a/keyboards/handwired/symmetric70_proto/matrix_debug/gpio_extr.h b/keyboards/handwired/symmetric70_proto/matrix_debug/gpio_extr.h new file mode 100644 index 0000000000..c7d08309d0 --- /dev/null +++ b/keyboards/handwired/symmetric70_proto/matrix_debug/gpio_extr.h @@ -0,0 +1,10 @@ +#pragma once +// clang-format off + +#if defined(__AVR__) +# define readPort(port) PINx_ADDRESS(port) +typedef uint8_t port_data_t; +#else +# define readPort(qmk_pin) palReadPort(PAL_PORT(qmk_pin)) +typedef uint16_t port_data_t; +#endif diff --git a/keyboards/handwired/symmetric70_proto/matrix_debug/matrix.c b/keyboards/handwired/symmetric70_proto/matrix_debug/matrix.c new file mode 100644 index 0000000000..c84efe2915 --- /dev/null +++ b/keyboards/handwired/symmetric70_proto/matrix_debug/matrix.c @@ -0,0 +1,324 @@ +/* +Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar + +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 <stdint.h> +#include <stdbool.h> +#include "util.h" +#include "matrix.h" +#include "debounce.h" +#include "quantum.h" +#ifndef readPort +# include "gpio_extr.h" +#endif + +#ifndef MATRIX_DEBUG_PIN +# define MATRIX_DEBUG_PIN_INIT() +# define MATRIX_DEBUG_SCAN_START() +# define MATRIX_DEBUG_SCAN_END() +# define MATRIX_DEBUG_DELAY_START() +# define MATRIX_DEBUG_DELAY_END() +# define MATRIX_DEBUG_GAP() +#else +# define MATRIX_DEBUG_GAP() asm volatile("nop \n nop":::"memory") +#endif + +#ifndef MATRIX_IO_DELAY_ALWAYS +# define MATRIX_IO_DELAY_ALWAYS 0 +#endif + +#ifdef DIRECT_PINS +static pin_t direct_pins[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS; +#elif (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW) +static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS; +static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS; +# ifdef MATRIX_MUL_SELECT +static const pin_t col_sel[MATRIX_COLS] = MATRIX_MUL_SEL; +# endif +#endif + +#ifdef MATRIX_IO_DELAY_PORTS +static const pin_t delay_ports[] = { MATRIX_IO_DELAY_PORTS }; +static const port_data_t delay_masks[] = { MATRIX_IO_DELAY_MASKS }; +# ifdef MATRIX_IO_DELAY_MULSEL +static const uint8_t delay_sel[] = { MATRIX_IO_DELAY_MULSEL }; +# endif +#endif + +/* matrix state(1:on, 0:off) */ +extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values +extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values + +static inline void setPinOutput_writeLow(pin_t pin) { + ATOMIC_BLOCK_FORCEON { + setPinOutput(pin); + writePinLow(pin); + } +} + +static inline void setPinInputHigh_atomic(pin_t pin) { + ATOMIC_BLOCK_FORCEON { setPinInputHigh(pin); } +} + +// matrix code + +#ifdef DIRECT_PINS + +static void init_pins(void) { + for (int row = 0; row < MATRIX_ROWS; row++) { + for (int col = 0; col < MATRIX_COLS; col++) { + pin_t pin = direct_pins[row][col]; + if (pin != NO_PIN) { + setPinInputHigh(pin); + } + } + } +} + +static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) { + // Start with a clear matrix row + matrix_row_t current_row_value = 0; + + for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) { + pin_t pin = direct_pins[current_row][col_index]; + if (pin != NO_PIN) { + current_row_value |= readPin(pin) ? 0 : (MATRIX_ROW_SHIFTER << col_index); + } + } + + // If the row has changed, store the row and return the changed flag. + if (current_matrix[current_row] != current_row_value) { + current_matrix[current_row] = current_row_value; + return true; + } + return false; +} + +#elif defined(DIODE_DIRECTION) +# if (DIODE_DIRECTION == COL2ROW) + +static void select_row(uint8_t row) { setPinOutput_writeLow(row_pins[row]); } + +static void unselect_row(uint8_t row) { setPinInputHigh_atomic(row_pins[row]); } + +static void unselect_rows(void) { + for (uint8_t x = 0; x < MATRIX_ROWS; x++) { + setPinInputHigh_atomic(row_pins[x]); + } +} + +static void init_pins(void) { +#ifdef MATRIX_MUL_SELECT + setPinOutput(MATRIX_MUL_SELECT); + writePinLow(MATRIX_MUL_SELECT); +#endif + unselect_rows(); + for (uint8_t x = 0; x < MATRIX_COLS; x++) { + setPinInputHigh_atomic(col_pins[x]); + } +} + +static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) { + // Start with a clear matrix row + matrix_row_t current_row_value = 0; + + // Select row + select_row(current_row); + matrix_output_select_delay(); + + // For each col... + for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) { + // Select the col pin to read (active low) +#ifdef MATRIX_MUL_SELECT + writePin(MATRIX_MUL_SELECT,col_sel[col_index]); + waitInputPinDelay(); +#endif + uint8_t pin_state = readPin(col_pins[col_index]); + + // Populate the matrix row with the state of the col pin + current_row_value |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index); + } + + // Unselect row + unselect_row(current_row); +#ifdef MATRIX_IO_DELAY_PORTS + if (current_row_value) { // wait for col signal to go HIGH + bool is_pressed; + do { + MATRIX_DEBUG_DELAY_START(); + is_pressed = false; + for (uint8_t i = 0; i < sizeof(delay_ports)/sizeof(pin_t); i++ ) { +# ifdef MATRIX_IO_DELAY_MULSEL + writePin(MATRIX_MUL_SELECT, delay_sel[i]); + waitInputPinDelay(); +# endif + is_pressed |= ( (readPort(delay_ports[i]) & delay_masks[i]) != delay_masks[i] ); + } + MATRIX_DEBUG_DELAY_END(); + } while (is_pressed); + } +#endif +#ifdef MATRIX_IO_DELAY_ADAPTIVE + if (current_row_value) { // wait for col signal to go HIGH + for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) { + MATRIX_DEBUG_DELAY_START(); +#ifdef MATRIX_MUL_SELECT + writePin(MATRIX_MUL_SELECT,col_sel[col_index]); + waitInputPinDelay(); +#endif + while (readPin(col_pins[col_index]) == 0) {} + MATRIX_DEBUG_DELAY_END(); + } + } +#endif +#ifdef MATRIX_IO_DELAY_ADAPTIVE2 + if (current_row_value) { // wait for col signal to go HIGH + pin_t state; + do { + MATRIX_DEBUG_DELAY_START(); + state = 0; + for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) { + MATRIX_DEBUG_DELAY_END(); + MATRIX_DEBUG_DELAY_START(); +#ifdef MATRIX_MUL_SELECT + writePin(MATRIX_MUL_SELECT,col_sel[col_index]); + waitInputPinDelay(); +#endif + state |= (readPin(col_pins[col_index]) == 0); + } + MATRIX_DEBUG_DELAY_END(); + } while (state); + } +#endif + if (MATRIX_IO_DELAY_ALWAYS || current_row + 1 < MATRIX_ROWS) { + MATRIX_DEBUG_DELAY_START(); + matrix_output_unselect_delay(); // wait for col signal to go HIGH + MATRIX_DEBUG_DELAY_END(); + } + + // If the row has changed, store the row and return the changed flag. + if (current_matrix[current_row] != current_row_value) { + current_matrix[current_row] = current_row_value; + return true; + } + return false; +} + +# elif (DIODE_DIRECTION == ROW2COL) + +static void select_col(uint8_t col) { setPinOutput_writeLow(col_pins[col]); } + +static void unselect_col(uint8_t col) { setPinInputHigh_atomic(col_pins[col]); } + +static void unselect_cols(void) { + for (uint8_t x = 0; x < MATRIX_COLS; x++) { + setPinInputHigh_atomic(col_pins[x]); + } +} + +static void init_pins(void) { + unselect_cols(); + for (uint8_t x = 0; x < MATRIX_ROWS; x++) { + setPinInputHigh_atomic(row_pins[x]); + } +} + +static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) { + bool matrix_changed = false; + + // Select col + select_col(current_col); + matrix_output_select_delay(); + + // For each row... + for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) { + // Store last value of row prior to reading + matrix_row_t last_row_value = current_matrix[row_index]; + matrix_row_t current_row_value = last_row_value; + + // Check row pin state + if (readPin(row_pins[row_index]) == 0) { + // Pin LO, set col bit + current_row_value |= (MATRIX_ROW_SHIFTER << current_col); + } else { + // Pin HI, clear col bit + current_row_value &= ~(MATRIX_ROW_SHIFTER << current_col); + } + + // Determine if the matrix changed state + if ((last_row_value != current_row_value)) { + matrix_changed |= true; + current_matrix[row_index] = current_row_value; + } + } + + // Unselect col + unselect_col(current_col); + if (MATRIX_IO_DELAY_ALWAYS || current_col + 1 < MATRIX_COLS) { + matrix_output_unselect_delay(); // wait for col signal to go HIGH + } + + return matrix_changed; +} + +# else +# error DIODE_DIRECTION must be one of COL2ROW or ROW2COL! +# endif +#else +# error DIODE_DIRECTION is not defined! +#endif + +void matrix_init(void) { + // initialize key pins + init_pins(); + + // initialize matrix state: all keys off + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + raw_matrix[i] = 0; + matrix[i] = 0; + } + + debounce_init(MATRIX_ROWS); + + matrix_init_quantum(); +} + +uint8_t matrix_scan(void) { + bool changed = false; + MATRIX_DEBUG_PIN_INIT(); + + MATRIX_DEBUG_SCAN_START(); +#if defined(DIRECT_PINS) || (DIODE_DIRECTION == COL2ROW) + // Set row, read cols + for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) { + changed |= read_cols_on_row(raw_matrix, current_row); + } +#elif (DIODE_DIRECTION == ROW2COL) + // Set col, read rows + for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) { + changed |= read_rows_on_col(raw_matrix, current_col); + } +#endif + MATRIX_DEBUG_SCAN_END(); MATRIX_DEBUG_GAP(); + + MATRIX_DEBUG_SCAN_START(); + debounce(raw_matrix, matrix, MATRIX_ROWS, changed); + MATRIX_DEBUG_SCAN_END(); MATRIX_DEBUG_GAP(); + + MATRIX_DEBUG_SCAN_START(); + matrix_scan_quantum(); + MATRIX_DEBUG_SCAN_END(); + return (uint8_t)changed; +} diff --git a/keyboards/handwired/symmetric70_proto/matrix_debug/readme.md b/keyboards/handwired/symmetric70_proto/matrix_debug/readme.md new file mode 100644 index 0000000000..3e45db87e9 --- /dev/null +++ b/keyboards/handwired/symmetric70_proto/matrix_debug/readme.md @@ -0,0 +1,200 @@ +# Debug version matrix.c + +This matrix.c is quantum/matrix.c with the following additions: + +* Added the MATRIX_DEBUG_SCAN_{START/END} macro to measure the execution time of matrix_scan(). +* Added the MATRIX_DEBUG_DELAY_{START/END} macro to measure delay time. +* Added the MATRIX_MUL_SELECT handling for symmetric70_proto. + +## Compile + +* Set MATRIX_IO_DELAY value + * `make MTEST=mdelay0 handwired/symmetric70_proto/promicro/normal:default:flash` + * `make MTEST=mdelay=1 handwired/symmetric70_proto/promicro/normal:default:flash` + * `make MTEST=mdelay=2 handwired/symmetric70_proto/promicro/normal:default:flash` + * `make MTEST=mdelay=3 handwired/symmetric70_proto/promicro/normal:default:flash` + * `make MTEST=mdelay=4 handwired/symmetric70_proto/promicro/normal:default:flash` + * `make MTEST=mdelay=5 handwired/symmetric70_proto/promicro/normal:default:flash` + * `make MTEST=mdelay=10 handwired/symmetric70_proto/promicro/normal:default:flash` + * `make MTEST=mdelay=20 handwired/symmetric70_proto/promicro/normal:default:flash` + * `make MTEST=mdelay=30 handwired/symmetric70_proto/promicro/normal:default:flash` +* Measure the execution time of matrix_scan() + * `make MTEST=matrix_debug_scan[,<other options>..] handwired/symmetric70_proto/promicro/normal:default:flash` +* Measure delay time. + * `make MTEST=matrix_debug_delay[,<other options>..] handwired/symmetric70_proto/promicro/normal:default:flash` +* Change the behavior of delay + * `make MTEST=matrix_debug_delay,always_delay handwired/symmetric70_proto/promicro/normal:default:flash` + * `make MTEST=matrix_debug_delay,adaptive_delay,mdelay0 handwired/symmetric70_proto/promicro/normal:default:flash` + * `make MTEST=matrix_debug_delay,adaptive_delay_fast,mdelay0 handwired/symmetric70_proto/promicro/normal:default:flash` + +## Measurement result +### Pro Micro (ATmega32u4 16Mhz) +#### Default setting (show `matrix_scan()` time) + - `make MTEST=matrix_debug_scan handwired/symmetric70_proto/promicro/normal:default:flash` + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: matrix_scan() + - Execution time of matrix_scan() 503us + - Frequency of matrix scan 1.81kHz (551.0us) + ![DS1Z_QuickPrint2](https://user-images.githubusercontent.com/2170248/115994477-0ba64400-a612-11eb-98ba-b8cc362f26ac.png) + +#### Always call `matrix_output_unselect_delay()` (show `matrix_scan()` time, default MATRIX_IO_DELAY) + - `make MTEST=matrix_debug_scan,always_delay handwired/symmetric70_proto/promicro/normal:default:flash` + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: matrix_scan() + - Execution time of matrix_scan() 521us + - Frequency of matrix scan 1.76kHz (568.5us) + ![DS1Z_QuickPrint1](https://user-images.githubusercontent.com/2170248/115994488-1660d900-a612-11eb-83b1-cd820607db03.png) + +#### Adaptive delay (show `matrix_scan()` time, MATRIX_IO_DELAY = 0) + - `make MTEST=matrix_debug_scan,mdelay0,adaptive_delay handwired/symmetric70_proto/promicro/normal:default:flash` + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: matrix_scan() + - Execution time of matrix_scan() 383us + - Frequency of matrix scan 2.32kHz (431us) + ![DS1Z_QuickPrint3](https://user-images.githubusercontent.com/2170248/115994939-034f0880-a614-11eb-861f-b83a31efa51a.png) + +#### Adaptive delay (show delay time, MATRIX_IO_DELAY = 0) + - `make MTEST=matrix_debug_delay,mdelay0,adaptive_delay handwired/symmetric70_proto/promicro/normal:default:flash` + +##### Press R0C1, R1C1 key + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: delay time + - Delay time 68us + - Frequency of matrix scan 1.77kHz (565us) + ![DS1Z_QuickPrint55](https://user-images.githubusercontent.com/2170248/119561268-ead33900-bddf-11eb-9cc4-7e04826486cf.png) + +#### Fast adaptive delay (show `matrix_scan()` time, MATRIX_IO_DELAY = 0) + - `make MTEST=matrix_debug_scan,mdelay0,adaptive_delay_fast handwired/symmetric70_proto/promicro/normal:default:flash` + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: matrix_scan() + - Execution time of matrix_scan() 382us + - Frequency of matrix scan 2.33kHz (428us) + ![DS1Z_QuickPrint56](https://user-images.githubusercontent.com/2170248/119561280-eeff5680-bddf-11eb-9576-e4cf64751955.png) + +#### Fast adaptive delay (show delay time, MATRIX_IO_DELAY = 0) + - `make MTEST=matrix_debug_delay,mdelay0,adaptive_delay_fast handwired/symmetric70_proto/promicro/normal:default:flash` + +##### Press R0C1, R1C1 key + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: delay time + - Delay time 11us + - Frequency of matrix scan 2.21kHz (452us) + ![DS1Z_QuickPrint57](https://user-images.githubusercontent.com/2170248/119561318-faeb1880-bddf-11eb-8592-694f9ecb2248.png) + +### Proton C (STM32F303 72MHz) +#### Default setting (show `matrix_scan()` time) + - `make MTEST=matrix_debug_scan handwired/symmetric70_proto/proton_c/normal:default:flash` + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: matrix_scan() + - Execution time of matrix_scan() 210us + - Frequency of matrix scan 4.35kHz (230.0us) + ![DS1Z_QuickPrint16](https://user-images.githubusercontent.com/2170248/116131295-2ad2cd80-a707-11eb-8d0a-6f7912456e03.png) + +#### Always call `matrix_output_unselect_delay()` (show `matrix_scan()` time, default MATRIX_IO_DELAY) + - `make MTEST=matrix_debug_scan,always_delay handwired/symmetric70_proto/proton_c/normal:default:flash` + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: matrix_scan() + - Execution time of matrix_scan() 242us + - Frequency of matrix scan 3.85kHz (260.0us) + ![DS1Z_QuickPrint17](https://user-images.githubusercontent.com/2170248/116131308-31f9db80-a707-11eb-8db7-d1960fa7b068.png) + +#### Adaptive delay (show `matrix_scan()` time, MATRIX_IO_DELAY = 0) + - `make MTEST=matrix_debug_scan,mdelay0,adaptive_delay handwired/symmetric70_proto/proton_c/normal:default:flash` + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: matrix_scan() + - Execution time of matrix_scan() 76.4us + - Frequency of matrix scan 10.6kHz (94.4us) + ![DS1Z_QuickPrint18](https://user-images.githubusercontent.com/2170248/116131369-44741500-a707-11eb-9c74-fa39d9e80947.png) + +#### Adaptive delay (show delay time, MATRIX_IO_DELAY = 0) + - `make MTEST=matrix_debug_delay,mdelay0,adaptive_delay handwired/symmetric70_proto/proton_c/normal:default:flash` + +##### Press R0C1, R1C1 key + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: delay time + - Delay time 7.6us + - Frequency of matrix scan 9.47kHz (105.6us) + ![DS1Z_QuickPrint58](https://user-images.githubusercontent.com/2170248/119666783-a3e15400-be70-11eb-9a58-220032117efd.png) + +##### Connect a 500pF capacitor between C2 line and GND, Press R0C2, R1C2, R2C2, R3C2, R4C2 keys + - CH1: Row 0 + - CH2: Row 1 + - CH3: Col 2 + - CH4: delay time + - Delay time 12us + alpha + - Frequency of matrix scan 5.45kHz (183us) + - Threshold Voltage 1.9V + ![DS1Z_QuickPrint59](https://user-images.githubusercontent.com/2170248/119666946-cc694e00-be70-11eb-9b97-4c500416d774.png) + +##### Connect a 1000pF capacitor between C2 line and GND, Press R0C2, R1C2, R2C2, R3C2, R4C2 keys + - CH1: Row 0 + - CH2: Row 1 + - CH3: Col 2 + - CH4: delay time + - Delay time 20us + alpha + - Frequency of matrix scan 4.48kHz (223us) + - Threshold Voltage 1.9V + ![DS1Z_QuickPrint60](https://user-images.githubusercontent.com/2170248/119667127-f3c01b00-be70-11eb-8e7f-6f0a81f95e97.png) + +#### Fast adaptive delay (show `matrix_scan()` time, MATRIX_IO_DELAY = 0) + - `make MTEST=matrix_debug_scan,mdelay0,adaptive_delay_fast handwired/symmetric70_proto/proton_c/normal:default:flash` + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: matrix_scan() + - Execution time of matrix_scan() 75.6us + - Frequency of matrix scan 10.8kHz (92.2us) + ![DS1Z_QuickPrint62](https://user-images.githubusercontent.com/2170248/119667218-0b979f00-be71-11eb-946c-16f0a0454056.png) + +#### Fast adaptive delay (show delay time, MATRIX_IO_DELAY = 0) + - `make MTEST=matrix_debug_delay,mdelay0,adaptive_delay_fast handwired/symmetric70_proto/proton_c/normal:default:flash` + +##### Press R0C1, R1C1 key + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: delay time + - Delay time 1.6us + - Frequency of matrix scan 10.6kHz (94.4us) + ![DS1Z_QuickPrint63](https://user-images.githubusercontent.com/2170248/119667378-33870280-be71-11eb-95aa-64213138ddac.png) + ![DS1Z_QuickPrint64](https://user-images.githubusercontent.com/2170248/119667504-52859480-be71-11eb-963e-eebc6e3da9dc.png) + +##### Connect a 500pF capacitor between C2 line and GND, Press R0C2, R1C2, R2C2, R3C2, R4C2 keys + - CH1: Row 0 + - CH2: Row 1 + - CH3: Col 2 + - CH4: delay time + - Delay time 13.2us + - Frequency of matrix scan 6.58kHz (152.6us) + - Threshold Voltage 1.9V + ![DS1Z_QuickPrint65](https://user-images.githubusercontent.com/2170248/119667644-72b55380-be71-11eb-8030-854de1900408.png) + +##### Connect a 1000pF capacitor between C2 line and GND, Press R0C2, R1C2, R2C2, R3C2, R4C2 keys + - CH1: Row 0 + - CH2: Row 1 + - CH3: Col 2 + - CH4: delay time + - Delay time 20us + - Frequency of matrix scan 5.30kHz (188.8us) + - Threshold Voltage 1.9V + ![DS1Z_QuickPrint66](https://user-images.githubusercontent.com/2170248/119667785-8f518b80-be71-11eb-8d40-fc3293aa072b.png) |