[Keymap] Update Helix:five_rows OLED code (#14427)

* Stop using snprintf() in keymaps/five_rows/oled_display.c.

The binary size becomes 1350 bytes smaller.

make HELIX=verbose,core-oled helix/rev2/sc:five_rows
(104 bytes over) -> (95%, 1256 bytes free)

make helix/rev3_5rows:five_rows
(528 bytes over) -> (97%, 830 bytes free)

* add matrix scan rate display to OLED for keymaps/five_rows

* add matrix_output_unselect_delay.c to helix keymaps/five_rows

* add GPLv2 header

* apply review comment

1 files changed, 80 insertions, 12 deletions

diff --git a/keyboards/helix/rev3_5rows/keymaps/five_rows/oled_display.c b/keyboards/helix/rev3_5rows/keymaps/five_rows/oled_display.c
index 090e8aaec3..fcbd81c9b6 100644
--- a/keyboards/helix/rev3_5rows/keymaps/five_rows/oled_display.c
+++ b/keyboards/helix/rev3_5rows/keymaps/five_rows/oled_display.c
@@ -64,6 +64,55 @@ void matrix_update(struct CharacterMatrix *dest,
 }
 #    endif
 
+static char *sprint_decimal(char *buf, int data) {
+    if (data > 9) {
+        buf = sprint_decimal(buf, data/10);
+    }
+    *buf++ = "0123456789"[data%10];
+    *buf = '\0';
+    return buf;
+}
+
+static char *sprint_hex(char *buf, uint32_t data) {
+    if (data > 0xf) {
+        buf = sprint_hex(buf, data/0x10);
+    }
+    *buf++ = "0123456789abcdef"[data & 0xf];
+    *buf = '\0';
+    return buf;
+}
+
+char *sprints(char *buf, char *src) {
+    while (*src) {
+        *buf++ = *src++;
+    }
+    *buf = '\0';
+    return buf;
+}
+
+char *sprintx(char *buf, char *leadstr, uint32_t data) {
+    buf = sprints(buf, leadstr);
+    buf = sprint_hex(buf, data);
+    return buf;
+}
+
+char *sprintd(char *buf, char *leadstr, int data) {
+    buf = sprints(buf, leadstr);
+    buf = sprint_decimal(buf, data);
+    return buf;
+}
+
+char *sprint2d(char *buf, char *leadstr, int data) {
+    buf = sprints(buf, leadstr);
+    if (data > 99) {
+        return sprint_decimal(buf, data);
+    }
+    if (data < 10) {
+        *buf++ = ' ';
+    }
+    return sprint_decimal(buf, data);
+}
+
 #    ifdef SSD1306OLED
 static void render_logo(struct CharacterMatrix *matrix) {
 #    else
@@ -76,20 +125,35 @@ static void render_logo(void) {
         0xc0,0xc1,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,0xcd,0xce,0xcf,0xd0,0xd1,0xd2,0xd3,0xd4,
         0};
     oled_write_P(helix_logo, false);
-#    ifdef RGBLIGHT_ENABLE
     char buf[30];
+    char *bufp;
+#    ifdef RGBLIGHT_ENABLE
     if (RGBLIGHT_MODES > 1 && rgblight_is_enabled()) {
-        snprintf(buf, sizeof(buf), " LED %2d: %d,%d,%d ",
-                 rgblight_get_mode(),
-                 rgblight_get_hue()/RGBLIGHT_HUE_STEP,
-                 rgblight_get_sat()/RGBLIGHT_SAT_STEP,
-                 rgblight_get_val()/RGBLIGHT_VAL_STEP);
+        bufp = sprint2d(buf, " LED ", rgblight_get_mode());
+#        ifdef DEBUG_MATRIX_SCAN_RATE
+        bufp = sprintd(bufp, "  scan:", get_matrix_scan_rate());
+#        else
+        bufp = sprintd(bufp, ": ", rgblight_get_hue()/RGBLIGHT_HUE_STEP);
+        bufp = sprintd(bufp, ",", rgblight_get_sat()/RGBLIGHT_SAT_STEP);
+        bufp = sprintd(bufp, ",", rgblight_get_val()/RGBLIGHT_VAL_STEP);
+        bufp = sprints(bufp, " ");
+#        endif
         oled_write(buf, false);
 #        ifndef SSD1306OLED
     } else {
+#        ifdef DEBUG_MATRIX_SCAN_RATE
+        bufp = sprintd(buf, "  scan:", get_matrix_scan_rate());
+        oled_write(buf, false);
+#        endif
         oled_write_P( PSTR("\n"), false);
 #        endif
     }
+#    else
+#        ifdef DEBUG_MATRIX_SCAN_RATE
+    bufp = sprintd(buf, " scan:", get_matrix_scan_rate());
+    bufp = sprints(bufp, " ");
+    oled_write(buf, false);
+#        endif
 #    endif
 }
 
@@ -142,6 +206,11 @@ void render_status(void) {
     int name_num;
     uint32_t lstate;
     oled_write_P(layer_names[current_default_layer], false);
+#    ifdef DEBUG_MATRIX_SCAN_RATE
+    char buf[16];
+    sprintd(buf, " scan:", get_matrix_scan_rate());
+    oled_write(buf, false);
+#    endif
     oled_write_P(PSTR("\n"), false);
     for (lstate = layer_state, name_num = 0;
          lstate && name_num < sizeof(layer_names)/sizeof(char *);
@@ -152,14 +221,13 @@ void render_status(void) {
             }
         }
     }
+    oled_write_P(PSTR("\n"), false);
 
     // Host Keyboard LED Status
-    char led[40];
-    snprintf(led, sizeof(led), "\n%s  %s  %s",
-             (host_keyboard_leds() & (1<<USB_LED_NUM_LOCK)) ? "NUMLOCK" : "       ",
-             (host_keyboard_leds() & (1<<USB_LED_CAPS_LOCK)) ? "CAPS" : "    ",
-             (host_keyboard_leds() & (1<<USB_LED_SCROLL_LOCK)) ? "SCLK" : "    ");
-    oled_write(led, false);
+    led_t led_state = host_keyboard_led_state();
+    oled_write_P(led_state.num_lock ? PSTR("NUMLOCK  ") : PSTR("         "), false);
+    oled_write_P(led_state.caps_lock ? PSTR("CAPS  ") : PSTR("      "), false);
+    oled_write_P(led_state.scroll_lock ? PSTR("SCLK  ") : PSTR("      "), false);
 }
 
 #    ifdef SSD1306OLED