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diff --git a/keyboards/handwired/symmetric70_proto/matrix_fast/readme.md b/keyboards/handwired/symmetric70_proto/matrix_fast/readme.md new file mode 100644 index 0000000000..dc744a4c46 --- /dev/null +++ b/keyboards/handwired/symmetric70_proto/matrix_fast/readme.md @@ -0,0 +1,168 @@ +# Fast and extensible matrix.c + +This matrix.c is faster and more extensible than the standard quantum/matrix.c. + +* The execution speed of the `matrix_scan()` function is several times faster than quantum/matrix.c. +* In addition to handling MCU GPIOs, it can be extended to handle I/O extenders. + +## ToDo list +- [x] support Pro Micro +- [x] support Proton-C +- [x] support DIRECT_PINS +- [x] support DIODE_DIRECTION == ROW2COL +- [x] support 74HC157: quadruple 2-line to 1-line data selectors / multiplexers +- [x] support 74HC153: dual 4-line to 1-line data selectors / multiplexers +- [ ] support I/O expander (MCP23018) +- [ ] support MCU & I/O expander (MCP23018) mixture like ErgoDox + +## Configuration + +This matrix.c requires a different configuration than quantum/matrix.c. + +### Output pins configuration + +The output pins is the Row pins if `DIODE_DIRECTION == COL2ROW`, and the Col pins if `DIODE_DIRECTION == ROW2COL`. When DIRECT_PINS is defined, the output pins do not need to be set. + +Example: +```c +// list of OUTPUT(row) ports +#define MATRIX_OUT_PORTS \ + (Port_D, MCU_GPIO, D0), \ + (Port_C, MCU_GPIO, C0), \ + (Port_E, MCU_GPIO, E0), \ + (Port_B, MCU_GPIO, B0) +// list of OUTPUT pins +#define MATRIX_OUT_PINS \ + (0, Port_D, 4), \ + (1, Port_C, 6), \ + (2, Port_D, 7), \ + (3, Port_E, 6), \ + (4, Port_B, 4), \ + (5, Port_B, 5) +``` + +### Input pins configuration + +The input pins is the Col pins if `DIODE_DIRECTION == COL2ROW`, and the Row pins if `DIODE_DIRECTION == ROW2COL`. When DIRECT_PINS is defined, the input pin settings will enumerate the connection pins of all switches. + +Example: +```c +// list of INPUT ports +#define MATRIX_IN_PORTS (Port_F, MCU_GPIO, F0), (Port_B, MCU_GPIO, B0) +// list of INPUT pins +#define MATRIX_IN_PINS \ + (0, Port_F, 4), \ + (1, Port_F, 5), \ + (2, Port_F, 6), \ + (3, Port_F, 7), \ + (4, Port_B, 1), \ + (5, Port_B, 3) +``` + +### Multiplexer Extension + +By defining the `MATRIX_EXTENSION_74HC157` macro or `MATRIX_EXTENSION_74HC153` macro, you can connect a multiplexer to the GPIO to extend the input pins. + +Example: +```c +#define MATRIX_EXTENSION_74HC157 B2 /* or #define MATRIX_EXTENSION_74HC153 B2, B6 */ + +// list of OUTPUT ports +#define MATRIX_OUT_PORTS (Port_D, MCU_GPIO, D0), (Port_C, MCU_GPIO, C0), (Port_E, MCU_GPIO, E0), (Port_B, MCU_GPIO, B0) +// list of OUTPUT pins +#define MATRIX_OUT_PINS (0, Port_D, 4), (1, Port_C, 6), (2, Port_D, 7), (3, Port_E, 6), (4, Port_B, 4), (5, Port_B, 5) + +// list of INPUT ports +#define MATRIX_IN_PORTS \ + (Port_Fa, MCU_GPIOa, F0), \ + (Port_Ba, MCU_GPIOa, B0), \ + (Port_Fb, MCU_GPIOb, F0), \ + (Port_Bb, MCU_GPIOb, B0) +// list of INPUT pins +#define MATRIX_IN_PINS \ + (0, Port_Fa, 4), \ + (1, Port_Fb, 5), \ + (2, Port_Fb, 6), \ + (3, Port_Fa, 7), \ + (4, Port_Ba, 1), \ + (5, Port_Bb, 3) +``` + +### I/O expander Extension + +I plan to provide extensions to support I/O expanders such as MCP23018 and PCA9555. + +## Compile + +* Measure the execution time of matrix_scan() + * `make MTEST=matrix_debug_scan[,<other options>..] handwired/symmetric70_proto/promicro/fast:default:flash` +* Measure delay time. + * `make MTEST=matrix_debug_delay[,<other options>..] handwired/symmetric70_proto/promicro/fast:default:flash` + +## Measurement result +### Pro Micro (ATmega32u4 16Mhz) +#### Default setting (show `matrix_scan()` time) + - `make MTEST=matrix_debug_scan handwired/symmetric70_proto/promicro/fast: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 8.09kHz (123.6us) +  + +#### Default setting (show delay time) + - `make MTEST=matrix_debug_delay handwired/symmetric70_proto/promicro/fast:default:flash` +##### Press R0C0 key + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: delay time + - Frequency of matrix scan 7.84kHz (127.6us) + + + + +### Proton C +#### Default setting (show `matrix_scan()` time) + - `make MTEST=matrix_debug_scan handwired/symmetric70_proto/proton_c/fast:default:flash` + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: matrix_scan() + - Execution time of matrix_scan() 49.8us + - Frequency of matrix scan 15.1kHz (66.2.6us) + + + +#### Default setting (show delay time) + - `make MTEST=matrix_debug_delay handwired/symmetric70_proto/proton_c/fast:default:flash` +##### Press R0C0 key + - CH1: Row 0 + - CH2: Row 1 + - CH3: Row 4 + - CH4: delay time + - Frequency of matrix scan 13.9kHz (71.8us) + + + + +##### Connect a 500pF capacitor between C0 line and GND, Press R0C0, R1C0, R2C0, R3C0, R4C0 keys + - CH1: Row 0 + - CH2: Row 1 + - CH3: Col 0 + - CH4: delay time + - Delay time 11.6us + - Threshold Voltage 1.9V + + + +##### Connect a 1000pF capacitor between C0 line and GND, Press R0C0, R1C0, R2C0, R3C0, R4C0 keys + - CH1: Row 0 + - CH2: Row 1 + - CH3: Col 0 + - CH4: delay time + - Delay time 18.6us + - Threshold Voltage 1.9V + + |