add broken custom matrix code

keyboards/rkb1/keymaps/default/keymap.c

@@ -295,7 +295,9 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
 }
 
 void matrix_init_user(void) {
+#ifdef STENO_ENABLE
     steno_set_mode(STENO_MODE_GEMINI);
+#endif
 #ifdef OLED_ENABLE
     oled_turn_on_for(60000);
 #endif

keyboards/rkb1/matrix.c

@@ -0,0 +1,104 @@
+#include QMK_KEYBOARD_H
+#undef PARAM_ASSERTIONS_ENABLED
+#define PARAM_ASSERTIONS_ENABLED(x) 0
+#include "hardware/pio.h"
+#include "hardware/dma.h"
+#include "hardware/irq.h"
+#include "matrix.pio.h"
+#include "split_util.h"
+
+// Faster, PIO based matrix scanning routines
+// It sets up two DMAs that feed a PIO FSM to scan the matrix.
+
+static uint32_t          matrix_scan_input[] __attribute__((aligned(8))) = {0x01020408, 0x10200000};
+static int               tx_chan, rx_chan;
+static volatile uint32_t matrix_scan_result;
+
+static void dma_handler(void) {
+    // Restart the DMAs when they have finished
+    if (!dma_channel_is_busy(tx_chan)) {
+        dma_channel_acknowledge_irq0(tx_chan);
+        dma_channel_set_trans_count(tx_chan, ~0, true);
+        if (debug_matrix) {
+            uprintf("TX DMA restarted\n");
+        }
+    }
+    if (!dma_channel_is_busy(rx_chan)) {
+        dma_channel_acknowledge_irq0(rx_chan);
+        dma_channel_set_trans_count(rx_chan, ~0, true);
+        if (debug_matrix) {
+            uprintf("RX DMA restarted\n");
+        }
+    }
+}
+
+void matrix_init_custom(void) {
+    PIO  pio    = pio0;
+    uint offset = pio_add_program(pio, &matrix_program);
+    uint sm     = pio_claim_unused_sm(pio, true);
+    matrix_program_init(pio, sm, offset, 0);
+
+    uint tx_dreq = pio_get_dreq(pio, sm, true);
+    uint rx_dreq = pio_get_dreq(pio, sm, false);
+
+    tx_chan = dma_claim_unused_channel(true);
+
+    dma_channel_config tx_cfg = dma_channel_get_default_config(tx_chan);
+
+    channel_config_set_read_increment(&tx_cfg, true);
+    channel_config_set_write_increment(&tx_cfg, false);
+    channel_config_set_dreq(&tx_cfg, tx_dreq);
+    channel_config_set_transfer_data_size(&tx_cfg, DMA_SIZE_32);
+    channel_config_set_ring(&tx_cfg, false, 3); // wrap read around
+
+    dma_channel_set_config(tx_chan, &tx_cfg, false);
+    dma_channel_set_irq0_enabled(tx_chan, true);
+    dma_channel_set_read_addr(tx_chan, matrix_scan_input, false);
+    dma_channel_set_write_addr(tx_chan, &pio0_hw->txf[sm], false);
+
+    // Set up the rx channel
+    rx_chan = dma_claim_unused_channel(true);
+
+    dma_channel_config rx_cfg = dma_channel_get_default_config(rx_chan);
+    channel_config_set_read_increment(&rx_cfg, false);
+    channel_config_set_write_increment(&rx_cfg, false);
+    channel_config_set_dreq(&rx_cfg, rx_dreq);
+    channel_config_set_transfer_data_size(&rx_cfg, DMA_SIZE_32);
+
+    dma_channel_set_config(rx_chan, &rx_cfg, false);
+    dma_channel_set_irq0_enabled(rx_chan, true);
+    dma_channel_set_read_addr(rx_chan, &pio0_hw->rxf[sm], false);
+    dma_channel_set_write_addr(rx_chan, &matrix_scan_result, false);
+
+    // Set up IRQs for restarting the DMAs
+    irq_set_exclusive_handler(DMA_IRQ_0, dma_handler);
+    irq_set_enabled(DMA_IRQ_0, true);
+    // Call the IRQ handler manually to reset the trans counts and start the DMA channels
+    dma_handler();
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    bool matrix_has_changed = false;
+
+    // Copy over the matrix scan result to avoid concurrent access from DMA
+    uint32_t local_state      = matrix_scan_result;
+    uint32_t local_state_copy = local_state;
+
+    int start_row = isLeftHand ? 0 : 5;
+
+    for (int row = 0; row < 5; row++) {
+        // get a new matrix row by shifting it out of the state
+        matrix_row_t new_row = local_state & 0x1F;
+        local_state >>= 5;
+        // check if the row has changed
+        matrix_has_changed |= (current_matrix[start_row + row] != new_row);
+        // update the current matrix
+        current_matrix[start_row + row] = new_row;
+    }
+
+    if (debug_matrix && matrix_has_changed) {
+        uprintf("Matrix scan: %08lx\n", local_state_copy);
+    }
+
+    return matrix_has_changed;
+}

keyboards/rkb1/matrix.pio

@@ -0,0 +1,37 @@
+.program matrix
+; INPUT: repeated bit pattern
+; 0000_0100_0000_1000_0001_0000_0010_0000_0100_0000_1000_0001_0000_0000_0000_0000
+; So, like: 0x0408_1020, 0x4081_0000
+  set x, 7
+loop:
+  pull ifempty [31]
+  ; Assert the column pins
+  out pins, 8 [31]
+  ; Read the row pins
+  in pins, 5 [31]
+  jmp x--, loop [31]
+  ; Output the two missing bits and push
+  in null, 2 [31]
+  push [31]
+
+% c-sdk {
+static inline void matrix_program_init(PIO pio, uint sm, uint offset, uint pin) {
+    pio_sm_config c = matrix_program_get_default_config(offset);
+
+    // The row inputs start at the pin base
+    sm_config_set_in_pins(&c, pin);
+    // The 6 output bits come after the 5 input bits
+    sm_config_set_out_pins(&c, pin + 5, 6);
+    // Set up the pins for PIO
+    for(int i = 0; i < 11; i++)
+        pio_gpio_init(pio, pin + i);
+    // Set the pin directions
+    pio_sm_set_consecutive_pindirs(pio, sm, pin, 5, false);
+    pio_sm_set_consecutive_pindirs(pio, sm, pin + 5, 6, true);
+
+    // Load our configuration, and jump to the start of the program
+    pio_sm_init(pio, sm, offset, &c);
+    // Set the state machine running
+    pio_sm_set_enabled(pio, sm, true);
+}
+%}

keyboards/rkb1/matrix.pio.h

@@ -0,0 +1,61 @@
+// -------------------------------------------------- //
+// This file is autogenerated by pioasm; do not edit! //
+// -------------------------------------------------- //
+
+#pragma once
+
+#if !PICO_NO_HARDWARE
+#    include "hardware/pio.h"
+#endif
+
+// ------ //
+// matrix //
+// ------ //
+
+#define matrix_wrap_target 0
+#define matrix_wrap 6
+
+static const uint16_t matrix_program_instructions[] = {
+    //     .wrap_target
+    0xe027, //  0: set    x, 7
+    0x9fe0, //  1: pull   ifempty block          [31]
+    0x7f08, //  2: out    pins, 8                [31]
+    0x5f05, //  3: in     pins, 5                [31]
+    0x1f41, //  4: jmp    x--, 1                 [31]
+    0x5f62, //  5: in     null, 2                [31]
+    0x9f20, //  6: push   block                  [31]
+            //     .wrap
+};
+
+#if !PICO_NO_HARDWARE
+static const struct pio_program matrix_program = {
+    .instructions = matrix_program_instructions,
+    .length       = 7,
+    .origin       = -1,
+};
+
+static inline pio_sm_config matrix_program_get_default_config(uint offset) {
+    pio_sm_config c = pio_get_default_sm_config();
+    sm_config_set_wrap(&c, offset + matrix_wrap_target, offset + matrix_wrap);
+    return c;
+}
+
+static inline void matrix_program_init(PIO pio, uint sm, uint offset, uint pin) {
+    pio_sm_config c = matrix_program_get_default_config(offset);
+    // The row inputs start at the pin base
+    sm_config_set_in_pins(&c, pin);
+    // The 6 output bits come after the 5 input bits
+    sm_config_set_out_pins(&c, pin + 5, 6);
+    // Set up the pins for PIO
+    for (int i = 0; i < 11; i++)
+        pio_gpio_init(pio, pin + i);
+    // Set the pin directions
+    pio_sm_set_consecutive_pindirs(pio, sm, pin, 5, false);
+    pio_sm_set_consecutive_pindirs(pio, sm, pin + 5, 6, true);
+    // Load our configuration, and jump to the start of the program
+    pio_sm_init(pio, sm, offset, &c);
+    // Set the state machine running
+    pio_sm_set_enabled(pio, sm, true);
+}
+
+#endif

keyboards/rkb1/rules.mk

@@ -10,3 +10,6 @@ COMMON_VPATH += $(QUANTUM_PATH)/split_common
 EXTRAINCDIRS += $(BOARD_PATH)
 
 CFLAGS += -Wl,--defsym=__unhandled_user_irq=_unhandled_exception
+
+#SRC += matrix.c
+#CUSTOM_MATRIX = lite

platforms/chibios/vendors/RP/RP2040.mk

@@ -35,6 +35,7 @@ PICOSDKSRC     = $(PICOSDKROOT)/src/rp2_common/hardware_clocks/clocks.c \
                  $(PICOSDKROOT)/src/rp2_common/hardware_irq/irq.c \
                  $(PICOSDKROOT)/src/rp2_common/hardware_irq/irq_handler_chain.S \
                  $(PICOSDKROOT)/src/rp2_common/hardware_timer/timer.c \
+				 $(PICOSDKROOT)/src/rp2_common/hardware_dma/dma.c \
                  $(PICOSDKROOT)/src/rp2_common/pico_bootrom/bootrom.c \
                  $(PICOSDKROOT)/src/common/pico_time/time.c \
                  $(PICOSDKROOT)/src/common/pico_time/timeout_helper.c \
@@ -64,6 +65,7 @@ PICOSDKINC     = $(CHIBIOS)//os/various/pico_bindings/dumb/include \
                  $(PICOSDKROOT)/src/rp2_common/hardware_xosc/include \
                  $(PICOSDKROOT)/src/rp2_common/hardware_i2c/include \
                  $(PICOSDKROOT)/src/rp2_common/hardware_timer/include \
+				 $(PICOSDKROOT)/src/rp2_common/hardware_dma/include \
                  $(PICOSDKROOT)/src/rp2040/hardware_regs/include \
                  $(PICOSDKROOT)/src/rp2040/hardware_structs/include \
                  $(PICOSDKROOT)/src/boards/include \