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kbscan: Use u8 for array access

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The index will never be negative and will never exceed 255. Change them
from i16 to u8 so SDCC will generate more efficient code.

Signed-off-by: Tim Crawford <tcrawford@system76.com>
This commit is contained in:
Tim Crawford
2021-08-02 11:56:47 -06:00
committed by Jeremy Soller
parent 571316a4ea
commit 458cb000f3
1 changed files with 10 additions and 12 deletions
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20
src/board/system76/common/kbscan.c
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@ -30,11 +30,11 @@ uint8_t kbscan_matrix[KM_OUT] = { 0 };
uint8_t sci_extra = 0;
static inline bool matrix_position_is_esc(int16_t row, int16_t col) {
static inline bool matrix_position_is_esc(uint8_t row, uint8_t col) {
return (row == MATRIX_ESC_OUTPUT) && (col == MATRIX_ESC_INPUT);
}
static inline bool matrix_position_is_fn(int16_t row, int16_t col) {
static inline bool matrix_position_is_fn(uint8_t row, uint8_t col) {
return (row == MATRIX_FN_OUTPUT) && (col == MATRIX_FN_INPUT);
}
@ -60,7 +60,7 @@ void kbscan_init(void) {
// Debounce time in milliseconds
#define DEBOUNCE_DELAY 15
static uint8_t kbscan_get_row(int16_t i) {
static uint8_t kbscan_get_row(uint8_t i) {
// Report all keys as released when lid is closed
if (!lid_state) {
return 0;
@ -118,7 +118,7 @@ static uint8_t kbscan_get_row(int16_t i) {
}
#if KM_NKEY
static bool kbscan_has_ghost_in_row(int16_t row, uint8_t rowdata) {
static bool kbscan_has_ghost_in_row(uint8_t row, uint8_t rowdata) {
// Use arguments
row = row;
rowdata = rowdata;
@ -129,7 +129,7 @@ static inline bool popcount_more_than_one(uint8_t rowdata) {
return rowdata & (rowdata - 1);
}
static uint8_t kbscan_get_real_keys(int16_t row, uint8_t rowdata) {
static uint8_t kbscan_get_real_keys(uint8_t row, uint8_t rowdata) {
// Remove any "active" blanks from the matrix.
uint8_t realdata = 0;
for (uint8_t col = 0; col < KM_IN; col++) {
@ -143,7 +143,7 @@ static uint8_t kbscan_get_real_keys(int16_t row, uint8_t rowdata) {
return realdata;
}
static bool kbscan_has_ghost_in_row(int16_t row, uint8_t rowdata) {
static bool kbscan_has_ghost_in_row(uint8_t row, uint8_t rowdata) {
rowdata = kbscan_get_real_keys(row, rowdata);
// No ghosts exist when less than 2 keys in the row are active.
@ -152,7 +152,7 @@ static bool kbscan_has_ghost_in_row(int16_t row, uint8_t rowdata) {
}
// Check against other rows to see if more than one column matches.
for (int16_t i = 0; i < KM_OUT; i++) {
for (uint8_t i = 0; i < KM_OUT; i++) {
uint8_t otherrow = kbscan_get_real_keys(i, kbscan_get_row(i));
if (i != row && popcount_more_than_one(otherrow & rowdata)) {
return true;
@ -315,8 +315,7 @@ void kbscan_event(void) {
}
}
int16_t i;
for (i = 0; i < KM_OUT; i++) {
for (uint8_t i = 0; i < KM_OUT; i++) {
uint8_t new = kbscan_get_row(i);
uint8_t last = kbscan_matrix[i];
if (new != last) {
@ -331,8 +330,7 @@ void kbscan_event(void) {
}
// A key was pressed or released
int16_t j;
for (j = 0; j < KM_IN; j++) {
for (uint8_t j = 0; j < KM_IN; j++) {
bool new_b = new & BIT(j);
bool last_b = last & BIT(j);
if (new_b != last_b) {