From d0973e1cfb9f0a2643a30128ba119e76c6fe2f3c Mon Sep 17 00:00:00 2001 From: Pierre Chevalier Date: Sun, 18 Apr 2021 16:51:45 +0100 Subject: Add ferris 0.2 (#12133) Co-authored-by: Ryan --- keyboards/ferris/0_2/matrix.c | 255 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 255 insertions(+) create mode 100644 keyboards/ferris/0_2/matrix.c (limited to 'keyboards/ferris/0_2/matrix.c') diff --git a/keyboards/ferris/0_2/matrix.c b/keyboards/ferris/0_2/matrix.c new file mode 100644 index 0000000000..afa8a344cd --- /dev/null +++ b/keyboards/ferris/0_2/matrix.c @@ -0,0 +1,255 @@ +/* +Copyright 2013 Oleg Kostyuk + 2020 Pierre Chevalier + +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 . +*/ + +/* + * This code was heavily inspired by the ergodox_ez keymap, and modernized + * to take advantage of the quantum.h microcontroller agnostics gpio control + * abstractions and use the macros defined in config.h for the wiring as opposed + * to repeating that information all over the place. + */ + +#include QMK_KEYBOARD_H +#include "i2c_master.h" +#include + +extern i2c_status_t mcp23017_status; +#define MCP23017_I2C_TIMEOUT 1000 +#define I2C_WRITE 0x00 +#define I2C_READ 0x01 +// For a better understanding of the i2c protocol, this is a good read: +// https://www.robot-electronics.co.uk/i2c-tutorial + +// I2C address: +// See the datasheet, section 3.3.1 on addressing I2C devices and figure 3-6 for an +// illustration +// http://ww1.microchip.com/downloads/en/devicedoc/20001952c.pdf +// All address pins of the mcp23017 are connected to the ground on the ferris +// | 0 | 1 | 0 | 0 | A2 | A1 | A0 | +// | 0 | 1 | 0 | 0 | 0 | 0 | 0 | +#define I2C_ADDR 0b0100000 +#define I2C_ADDR_WRITE ((I2C_ADDR << 1) | I2C_WRITE) +#define I2C_ADDR_READ ((I2C_ADDR << 1) | I2C_READ) + +// Register addresses +// See https://github.com/adafruit/Adafruit-MCP23017-Arduino-Library/blob/master/Adafruit_MCP23017.h +#define IODIRA 0x00 // i/o direction register +#define IODIRB 0x01 +#define GPPUA 0x0C // GPIO pull-up resistor register +#define GPPUB 0x0D +#define MCP23017_GPIOA 0x12 // general purpose i/o port register (write modifies OLAT) +#define MCP23017_GPIOB 0x13 +#define OLATA 0x14 // output latch register +#define OLATB 0x15 + +bool i2c_initialized = 0; +i2c_status_t mcp23017_status = I2C_ADDR; + +#define I2C2_SCL_BANK GPIOB +#define I2C2_SCL 10 +#define I2C2_SDA_BANK GPIOB +#define I2C2_SDA 11 + +uint8_t init_mcp23017(void) { + print("init mcp23017\n"); + mcp23017_status = I2C_ADDR; + + // I2C subsystem + if (i2c_initialized == 0) { + i2c_init(); // on pins D(1,0) + i2c_initialized = true; + wait_ms(MCP23017_I2C_TIMEOUT); + } + + // set pin direction + // - unused : input : 1 + // - input : input : 1 + // - driving : output : 0 + // This means: we will read all the bits on GPIOA + // This means: we will write to the pins 0-4 on GPIOB (in select_rows) + uint8_t buf[] = {IODIRA, 0b11111111, 0b11110000}; + print("before transmit\n"); + mcp23017_status = i2c_transmit(I2C_ADDR_WRITE, buf, sizeof(buf), MCP23017_I2C_TIMEOUT); + uprintf("after transmit %i\n", mcp23017_status); + if (!mcp23017_status) { + // set pull-up + // - unused : on : 1 + // - input : on : 1 + // - driving : off : 0 + // This means: we will read all the bits on GPIOA + // This means: we will write to the pins 0-4 on GPIOB (in select_rows) + uint8_t pullup_buf[] = {GPPUA, 0b11111111, 0b11110000}; + mcp23017_status = i2c_transmit(I2C_ADDR_WRITE, pullup_buf, sizeof(pullup_buf), MCP23017_I2C_TIMEOUT); + uprintf("after transmit2 %i\n", mcp23017_status); + } + return mcp23017_status; +} + +/* matrix state(1:on, 0:off) */ +static matrix_row_t matrix[MATRIX_ROWS]; // debounced values + +static matrix_row_t read_cols(uint8_t row); +static void unselect_row(uint8_t row); +static void unselect_rows(void); +static void unselect_cols(void); +static void select_row(uint8_t row); + +static uint8_t mcp23017_reset_loop; + +static void init_mcu_pins(void) { + unselect_rows(); + unselect_cols(); +} + +void matrix_init_custom(void) { + debug_enable = true; + debug_matrix = true; + dprint("matrix_init_custom\n"); + // initialize row and col + init_mcu_pins(); + mcp23017_status = init_mcp23017(); + + // initialize matrix state: all keys off + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + matrix[i] = 0; + } +} + +// Reads and stores a row, returning +// whether a change occurred. +static inline bool store_matrix_row(matrix_row_t current_matrix[], uint8_t index) { + matrix_row_t temp = read_cols(index); + if (current_matrix[index] != temp) { + current_matrix[index] = temp; + return true; + } + return false; +} + +bool matrix_scan_custom(matrix_row_t current_matrix[]) { + if (mcp23017_status) { // if there was an error + if (++mcp23017_reset_loop == 0) { + // if (++mcp23017_reset_loop >= 1300) { + // since mcp23017_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans + // this will be approx bit more frequent than once per second + print("trying to reset mcp23017\n"); + mcp23017_status = init_mcp23017(); + if (mcp23017_status) { + print("right side not responding\n"); + } else { + print("right side attached\n"); + } + } + } + + bool changed = false; + for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) { + // select rows from left and right hands + uint8_t left_index = i; + uint8_t right_index = i + MATRIX_ROWS_PER_SIDE; + + changed |= store_matrix_row(current_matrix, left_index); + changed |= store_matrix_row(current_matrix, right_index); + + unselect_rows(); + } + + return changed; +} + +static matrix_row_t read_cols(uint8_t row) { + select_row(row); + if (row < MATRIX_ROWS_PER_SIDE) { + pin_t matrix_col_pins_mcu[MATRIX_COLS_PER_SIDE] = MATRIX_COL_PINS_MCU; + matrix_row_t current_row_value = 0; + matrix_io_delay(); + // For each col... + for (uint8_t col_index = 0; col_index < MATRIX_COLS_PER_SIDE; col_index++) { + // Select the col pin to read (active low) + uint8_t pin_state = readPin(matrix_col_pins_mcu[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(row); + return current_row_value; + } else { + // we don't need a 30us delay anymore, because selecting a + // right-hand row requires more than 30us for i2c. + if (mcp23017_status) { // if there was an error + return 0; + } else { + uint8_t buf[] = {MCP23017_GPIOA}; + mcp23017_status = i2c_transmit(I2C_ADDR_WRITE, buf, sizeof(buf), MCP23017_I2C_TIMEOUT); + // We read all the pins on GPIOA. + // The initial state was all ones and any depressed key at a given column for the currently selected row will have its bit flipped to zero. + // The return value is a row as represented in the generic matrix code were the rightmost bits represent the lower columns and zeroes represent non-depressed keys while ones represent depressed keys. + // Since the pins connected to eact columns are sequential, and counting from zero up (col 5 -> GPIOA0, col 6 -> GPIOA1 and so on), the only transformation needed is a bitwise not to swap all zeroes and ones. + uint8_t data[] = {0}; + if (!mcp23017_status) { + mcp23017_status = i2c_receive(I2C_ADDR_READ, data, sizeof(data), MCP23017_I2C_TIMEOUT); + data[0] = ~(data[0]); + } + return data[0]; + } + } +} + +static void unselect_row(uint8_t row) { + pin_t matrix_row_pins_mcu[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS_MCU; + setPinInputHigh(matrix_row_pins_mcu[row]); +} + +static void unselect_rows(void) { + // no need to unselect on mcp23017, because the select step sets all + // the other row bits high, and it's not changing to a different + // direction + + // unselect rows on microcontroller + pin_t matrix_row_pins_mcu[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS_MCU; + for (int pin_index = 0; pin_index < MATRIX_ROWS_PER_SIDE; pin_index++) { + pin_t pin = matrix_row_pins_mcu[pin_index]; + setPinInputHigh(pin); + } +} +static void unselect_cols(void) { + pin_t matrix_col_pins_mcu[MATRIX_COLS_PER_SIDE] = MATRIX_COL_PINS_MCU; + for (int pin_index = 0; pin_index < MATRIX_COLS_PER_SIDE; pin_index++) { + pin_t pin = matrix_col_pins_mcu[pin_index]; + setPinInputHigh(pin); + } +} + +static void select_row(uint8_t row) { + if (row < MATRIX_ROWS_PER_SIDE) { + // select on MCU + pin_t matrix_row_pins_mcu[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS_MCU; + pin_t pin = matrix_row_pins_mcu[row]; + setPinOutput(pin); + writePinLow(pin); + } else { + // select on mcp23017 + if (mcp23017_status) { // if there was an error + // do nothing + } else { + // Select the desired row by writing a byte for the entire GPIOB bus where only the bit representing the row we want to select is a zero (write instruction) and every other bit is a one. + // Note that the row - MATRIX_ROWS_PER_SIDE reflects the fact that being on the right hand, the columns are numbered from MATRIX_ROWS_PER_SIDE to MATRIX_ROWS, but the pins we want to write to are indexed from zero up on the GPIOB bus. + uint8_t buf[] = {MCP23017_GPIOB, 0xFF & ~(1 << (row - MATRIX_ROWS_PER_SIDE))}; + mcp23017_status = i2c_transmit(I2C_ADDR_WRITE, buf, sizeof(buf), I2C_TIMEOUT); + } + } +} -- cgit v1.2.3