2x2 matrix scan works

keyboards/cheapino/cheapino.c

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+#include <stdint.h>
+#include <stdbool.h>
+#include "quantum.h"
+#include QMK_KEYBOARD_H
+#include "i2c_master.h"
+
+
+void keyboard_post_init_user(void) {
+  // Customise these values to desired behaviour
+  debug_enable=true;
+  //debug_matrix=true;
+  debug_keyboard=true;
+  //debug_mouse=true;
+}
+

keyboards/cheapino/config.h

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+// Copyright 2022 Thomas Haukland (@Thomas Haukland)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "config_common.h"
+
+/*
+ * Feature disable options
+ *  These options are also useful to firmware size reduction.
+ */
+
+/* disable debug print */
+//#define NO_DEBUG
+
+/* disable print */
+//#define NO_PRINT
+
+/* disable action features */
+//#define NO_ACTION_LAYER
+//#define NO_ACTION_TAPPING
+//#define NO_ACTION_ONESHOT
+
+#define I2C_DRIVER I2CD2
+#define I2C1_SCL_PIN GP3
+#define I2C1_SDA_PIN GP2
+

keyboards/cheapino/halconf.h

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+
+#pragma once
+
+#define HAL_USE_PWM TRUE
+#define HAL_USE_PAL TRUE
+#define HAL_USE_I2C TRUE
+
+#include_next <halconf.h>

keyboards/cheapino/info.json

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+{
+    "manufacturer": "Thomas Haukland",
+    "keyboard_name": "cheapino",
+    "maintainer": "Thomas Haukland",
+    "bootloader": "rp2040",
+    "diode_direction": "COL2ROW",
+    "features": {
+        "bootmagic": true,
+        "command": false,
+        "console": true,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "matrix_pins": {
+        "cols": ["GP2", "GP2"],
+        "rows": ["GP1", "GP1"]
+    },
+    "processor": "RP2040",
+    "url": "",
+    "usb": {
+        "device_version": "1.0.0",
+        "pid": "0x0000",
+        "vid": "0xFEED"
+    },
+    "layouts": {
+        "LAYOUT_ortho_2x2": {
+            "layout": [
+                { "matrix": [0, 0], "x": 0, "y": 0 },
+                { "matrix": [0, 1], "x": 1, "y": 0 },
+                { "matrix": [1, 0], "x": 0, "y": 1 },
+                { "matrix": [1, 1], "x": 1, "y": 1 }
+            ]
+        }
+    }
+}

keyboards/cheapino/keymaps/default/keymap.c

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+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /*
+     * ┌───┬───┬───┐
+     * │ A │ B │ C │
+     * ├───┼───┼───┤
+     * │ D │ E │ F │
+     * └───┴───┴───┘
+     */
+    [0] = LAYOUT_ortho_2x2(
+        KC_A,    KC_B,    
+        KC_C,    KC_D
+    )
+};

keyboards/cheapino/matrix.c

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+#include <stdint.h>
+#include <stdbool.h>
+#include "quantum.h"
+#include QMK_KEYBOARD_H
+#include "i2c_master.h"
+#include <print.h>
+
+
+bool i2c_initialized = 0;
+i2c_status_t i2c_status;
+#define LED_COUNT 4
+const uint8_t leds[LED_COUNT] = {GP7,GP8,GP15,GP14};
+bool led_status[LED_COUNT] = {true,true,true,true};
+uint8_t _buf;
+
+ /* matrix state(1:on, 0:off) */
+ //static matrix_row_t matrix[MATRIX_ROWS];  // debounced values
+
+// The PCF857 addresses are explained on page 9 here:
+// https://www.ti.com/lit/ds/symlink/pcf8574.pdf
+// On the Cheapino, A0-A2 are grounded for a 0 value
+// In arduino, PCF857 address is 0x20, but thats without
+// the read/write bit at the end, so including that(unset)
+// the address is here 0x20 << 1 = 0b01000000
+//uint16_t i2c_timeout = 1250;
+#define I2C_ADDR       0b01000000
+#define I2C_ADDR_WRITE 0b01000000
+#define I2C_ADDR_READ  0b01000001
+//#define I2C_TIMEOUT 1000
+
+void toggle_leds(void) {
+    for (int i = 0; i < LED_COUNT; i++)
+    {
+        writePin(leds[i], led_status[i] ? 1 : 0);
+    }
+}
+void matrix_init_custom(void) {
+     //setPinOutput(GP6);
+     //writePinHigh(GP6);
+     printf("Init Cheapino!\n");
+
+     if (i2c_initialized == 0) {
+         i2c_init();
+         i2c_initialized = true;
+         wait_ms(I2C_TIMEOUT);
+     }
+    for (int i=0; i<LED_COUNT; i++)
+    {
+        setPinOutput(leds[i]);
+    }
+    toggle_leds();
+         wait_ms(500);
+    for (int i=0; i<LED_COUNT; i++)
+    {
+        led_status[i] = false;
+        toggle_leds();
+        wait_ms(400);
+    }
+     matrix_init_user();
+}
+
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    bool changed = false;
+    printf("Scan Cheapino!");
+
+    //i2c_status = i2c_start(I2C_ADDR_WRITE);
+    //led_status[0] = i2c_status == I2C_STATUS_SUCCESS;
+    // Set col0 pin high
+    _buf = 0b11111110;
+    uint8_t buf[]   = {0b11111110};
+    i2c_status = i2c_transmit(I2C_ADDR_WRITE, buf, sizeof(buf), 200);
+    //led_status[0] = i2c_status == I2C_STATUS_SUCCESS;
+    //i2c_stop();
+    toggle_leds();
+    // Read if row 0 or row 1 are high
+    //i2c_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT);
+    i2c_status = i2c_receive(I2C_ADDR_READ, &_buf, 1, I2C_TIMEOUT);
+    //toggle_leds();
+    //led_status[1] = i2c_status == I2C_STATUS_SUCCESS;
+    led_status[0] = ! (_buf & 0b00000010);
+    led_status[1] = ! (_buf & 0b00001000);
+
+    // Set col1 pin high
+    _buf = 0b11111011;
+    i2c_status = i2c_transmit(I2C_ADDR_WRITE, &_buf, 1, I2C_TIMEOUT);
+    //led_status[2] = i2c_status == I2C_STATUS_SUCCESS;
+    //toggle_leds();
+    // Read if row 0 or row 1 are high
+    i2c_status = i2c_receive(I2C_ADDR_READ, &_buf, 1, I2C_TIMEOUT);
+    //led_status[3] = i2c_status == I2C_STATUS_SUCCESS;
+    //i2c_stop();
+    led_status[2] = ! (_buf & 0b00000010);
+    led_status[3] = ! (_buf & 0b00001000);
+
+    // update leds
+    toggle_leds();
+
+    return changed;
+ }
+
+
+

keyboards/cheapino/mcuconf.h

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+ #pragma once
+
+#include_next <mcuconf.h>
+
+#undef RP_I2C_USE_I2C1
+#define RP_I2C_USE_I2C1 TRUE

keyboards/cheapino/readme.md

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+# cheapino
+
+![cheapino](imgur.com image replace me!)
+
+*A short description of the keyboard/project*
+
+* Keyboard Maintainer: [Thomas Haukland](https://github.com/Thomas Haukland)
+* Hardware Supported: *The PCBs, controllers supported*
+* Hardware Availability: *Links to where you can find this hardware*
+
+Make example for this keyboard (after setting up your build environment):
+
+    make cheapino:default
+
+Flashing example for this keyboard:
+
+    make cheapino:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available

keyboards/cheapino/rules.mk

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+# This file intentionally left blank
+CUSTOM_MATRIX = lite
+QUANTUM_LIB_SRC += i2c_master.c
+SRC += matrix.c