63 lines
2.6 KiB
C
63 lines
2.6 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <https://github.com/KarlK90> wrote this file. As long as you retain this
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* notice you can do whatever you want with this stuff. If we meet some day, and
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* you think this stuff is worth it, you can buy me a beer in return. KarlK90
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* ----------------------------------------------------------------------------
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*/
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#include "matrix.h"
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#include "atomic_util.h"
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#include "gpio.h"
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static pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
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/* Drive row pin low. */
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ATOMIC_BLOCK_FORCEON { writePinLow(row_pins[current_row]); }
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matrix_output_select_delay();
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/* Read all columns in one go, aka port scanning. */
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uint16_t porta = palReadPort(GPIOA);
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uint16_t portb = palReadPort(GPIOB);
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/* Order of pins on the mun is: A0, B11, B0, B10, B12, B2, A8
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Pin is active low, therefore we have to invert the result. */
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matrix_row_t cols = ~(((porta & (0x1 << 0)) >> 0) // A0 (0)
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| ((portb & (0x1 << 11)) >> 10) // B11 (1)
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| ((portb & (0x1 << 0)) << 2) // B0 (2)
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| ((portb & (0x1 << 10)) >> 7) // B10 (3)
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| ((portb & (0x1 << 12)) >> 8) // B12 (4)
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| ((portb & (0x1 << 2)) << 3) // B2 (5)
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| ((porta & (0x1 << 8)) >> 2)); // A8 (6)
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/* Reverse the order of columns for left hand as the board is flipped. */
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// if (isLeftHand) {
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// #if defined(__arm__)
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// /* rbit assembly reverses bit order of 32bit registers. */
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// uint32_t temp = cols;
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// __asm__("rbit %0, %1" : "=r"(temp) : "r"(temp));
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// cols = temp >> 24;
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// #else
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// /* RISC-V bit manipulation extension not present. Use bit-hack.
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// https://graphics.stanford.edu/~seander/bithacks.html#ReverseByteWith32Bits */
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// cols = (matrix_row_t)(((cols * 0x0802LU & 0x22110LU) | (cols * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16);
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// #endif
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// }
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current_matrix[current_row] = cols;
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/* Drive row pin high again. */
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ATOMIC_BLOCK_FORCEON { writePinHigh(row_pins[current_row]); }
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matrix_output_unselect_delay(current_row, row_pins[current_row] != 0);
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}
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#if defined(BUSY_WAIT)
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void matrix_output_unselect_delay(uint8_t line, bool key_pressed) {
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for (int32_t i = 0; i < BUSY_WAIT_INSTRUCTIONS; i++) {
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__asm__ volatile("nop" ::: "memory");
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}
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}
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#endif
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