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