qmk_firmware/keyboards/tzarc/djinn/djinn_portscan_matrix.c
Jeff Epler 9632360caa
Use a macro to compute the size of arrays at compile time (#18044)
* Add ARRAY_SIZE and CEILING utility macros

* Apply a coccinelle patch to use ARRAY_SIZE

* fix up some straggling items

* Fix 'make test:secure'

* Enhance ARRAY_SIZE macro to reject acting on pointers

The previous definition would not produce a diagnostic for
```
int *p;
size_t num_elem = ARRAY_SIZE(p)
```
but the new one will.

* explicitly get definition of ARRAY_SIZE

* Convert to ARRAY_SIZE when const is involved

The following spatch finds additional instances where the array is
const and the division is by the size of the type, not the size of
the first element:
```
@ rule5a using "empty.iso" @
type T;
const T[] E;
@@

- (sizeof(E)/sizeof(T))
+ ARRAY_SIZE(E)

@ rule6a using "empty.iso" @
type T;
const T[] E;
@@

- sizeof(E)/sizeof(T)
+ ARRAY_SIZE(E)
```

* New instances of ARRAY_SIZE added since initial spatch run

* Use `ARRAY_SIZE` in docs (found by grep)

* Manually use ARRAY_SIZE

hs_set is expected to be the same size as uint16_t, though it's made
of two 8-bit integers

* Just like char, sizeof(uint8_t) is guaranteed to be 1

This is at least true on any plausible system where qmk is actually used.

Per my understanding it's universally true, assuming that uint8_t exists:
https://stackoverflow.com/questions/48655310/can-i-assume-that-sizeofuint8-t-1

* Run qmk-format on core C files touched in this branch

Co-authored-by: Stefan Kerkmann <karlk90@pm.me>
2022-08-30 10:20:04 +02:00

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3.8 KiB
C

// Copyright 2018-2022 Nick Brassel (@tzarc)
// SPDX-License-Identifier: GPL-2.0-or-later
#include "quantum.h"
#include <hal_pal.h>
#include "djinn.h"
#define GPIOB_BITMASK (1 << 13 | 1 << 14 | 1 << 15) // B13, B14, B15
#define GPIOB_OFFSET 13
#define GPIOB_COUNT 3
#define GPIOC_BITMASK (1 << 6 | 1 << 7 | 1 << 8) // C6, C7, C8
#define GPIOC_OFFSET 6
// Pin definitions
static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
void matrix_wait_for_pin(pin_t pin, uint8_t target_state) {
rtcnt_t start = chSysGetRealtimeCounterX();
rtcnt_t end = start + 5000;
while (chSysIsCounterWithinX(chSysGetRealtimeCounterX(), start, end)) {
if (readPin(pin) == target_state) {
break;
}
}
}
void matrix_wait_for_port(stm32_gpio_t *port, uint32_t target_bitmask) {
rtcnt_t start = chSysGetRealtimeCounterX();
rtcnt_t end = start + 5000;
while (chSysIsCounterWithinX(chSysGetRealtimeCounterX(), start, end)) {
if ((palReadPort(port) & target_bitmask) == target_bitmask) {
break;
}
}
}
void matrix_init_custom(void) {
for (int i = 0; i < MATRIX_ROWS; ++i) {
setPinInputHigh(row_pins[i]);
}
for (int i = 0; i < MATRIX_COLS; ++i) {
setPinInputHigh(col_pins[i]);
}
}
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
static matrix_row_t temp_matrix[MATRIX_ROWS] = {0};
for (int current_col = 0; current_col < MATRIX_COLS; ++current_col) {
// Keep track of the pin we're working with
pin_t curr_col_pin = col_pins[current_col];
// Setup the output column pin
setPinOutput(curr_col_pin);
writePinLow(curr_col_pin);
matrix_wait_for_pin(curr_col_pin, 0);
// Read the row ports
uint32_t gpio_b = palReadPort(GPIOB);
uint32_t gpio_c = palReadPort(GPIOC);
// Unselect the row pin
setPinInputHigh(curr_col_pin);
// Construct the packed bitmask for the pins
uint32_t readback = ~(((gpio_b & GPIOB_BITMASK) >> GPIOB_OFFSET) | (((gpio_c & GPIOC_BITMASK) >> GPIOC_OFFSET) << GPIOB_COUNT));
// Inject values into the matrix
for (int i = 0; i < MATRIX_ROWS; ++i) {
if (readback & (1 << i)) {
temp_matrix[i] |= (1ul << current_col);
} else {
temp_matrix[i] &= ~(1ul << current_col);
}
}
// Wait for readback of the unselected column to go high
matrix_wait_for_pin(curr_col_pin, 1);
// Wait for readback of each port to go high -- unselecting the row would have been completed
matrix_wait_for_port(GPIOB, GPIOB_BITMASK);
matrix_wait_for_port(GPIOC, GPIOC_BITMASK);
}
// Check if we've changed, return the last-read data
bool changed = memcmp(current_matrix, temp_matrix, sizeof(temp_matrix)) != 0;
if (changed) {
memcpy(current_matrix, temp_matrix, sizeof(temp_matrix));
}
return changed;
}
void matrix_wait_for_interrupt(void) {
// Set up row/col pins and attach callback
for (int i = 0; i < ARRAY_SIZE(col_pins); ++i) {
setPinOutput(col_pins[i]);
writePinLow(col_pins[i]);
}
for (int i = 0; i < ARRAY_SIZE(row_pins); ++i) {
setPinInputHigh(row_pins[i]);
palEnableLineEvent(row_pins[i], PAL_EVENT_MODE_BOTH_EDGES);
}
// Wait for an interrupt
__WFI();
// Now that the interrupt has woken us up, reset all the row/col pins back to defaults
for (int i = 0; i < ARRAY_SIZE(row_pins); ++i) {
palDisableLineEvent(row_pins[i]);
writePinHigh(row_pins[i]);
setPinInputHigh(row_pins[i]);
}
for (int i = 0; i < ARRAY_SIZE(col_pins); ++i) {
writePinHigh(col_pins[i]);
setPinInputHigh(col_pins[i]);
}
}