From 7915827d7a9c920e8196937e7c3c5838c9ea2747 Mon Sep 17 00:00:00 2001
From: Andrew Scheller <github@loowis.durge.org>
Date: Thu, 4 Mar 2021 11:32:56 +0000
Subject: [PATCH] Fix examples to build cleanly if PICO_DEFAULT_LED_PIN isn't
 defined

---
 blink/blink.c                              |  4 ++++
 picoboard/blinky/blinky.c                  | 20 ++++++++++++--------
 picoboard/button/button.c                  |  2 +-
 pio/pwm/pwm.c                              |  5 +++++
 system/hello_double_tap/hello_double_tap.c |  4 ++++
 5 files changed, 26 insertions(+), 9 deletions(-)

diff --git a/blink/blink.c b/blink/blink.c
index f413d50..d478d78 100644
--- a/blink/blink.c
+++ b/blink/blink.c
@@ -7,6 +7,9 @@
 #include "pico/stdlib.h"
 
 int main() {
+#ifndef PICO_DEFAULT_LED_PIN
+#warning blink example requires a board with a regular LED
+#else
     const uint LED_PIN = PICO_DEFAULT_LED_PIN;
     gpio_init(LED_PIN);
     gpio_set_dir(LED_PIN, GPIO_OUT);
@@ -16,4 +19,5 @@ int main() {
         gpio_put(LED_PIN, 0);
         sleep_ms(250);
     }
+#endif
 }
diff --git a/picoboard/blinky/blinky.c b/picoboard/blinky/blinky.c
index eb2c545..6d51aaf 100644
--- a/picoboard/blinky/blinky.c
+++ b/picoboard/blinky/blinky.c
@@ -8,7 +8,6 @@
 #include "pico/stdlib.h"
 #include "hardware/gpio.h"
 
-const uint LED_PIN = PICO_DEFAULT_LED_PIN;
 const uint DOT_PERIOD_MS = 100;
 
 const char *morse_letters[] = {
@@ -40,25 +39,25 @@ const char *morse_letters[] = {
         "--.."   // Z
 };
 
-void put_morse_letter(const char *pattern) {
+void put_morse_letter(uint led_pin, const char *pattern) {
     for (; *pattern; ++pattern) {
-        gpio_put(LED_PIN, 1);
+        gpio_put(led_pin, 1);
         if (*pattern == '.')
             sleep_ms(DOT_PERIOD_MS);
         else
             sleep_ms(DOT_PERIOD_MS * 3);
-        gpio_put(LED_PIN, 0);
+        gpio_put(led_pin, 0);
         sleep_ms(DOT_PERIOD_MS * 1);
     }
     sleep_ms(DOT_PERIOD_MS * 2);
 }
 
-void put_morse_str(const char *str) {
+void put_morse_str(uint led_pin, const char *str) {
     for (; *str; ++str) {
         if (*str >= 'A' && *str < 'Z') {
-            put_morse_letter(morse_letters[*str - 'A']);
+            put_morse_letter(led_pin, morse_letters[*str - 'A']);
         } else if (*str >= 'a' && *str < 'z') {
-            put_morse_letter(morse_letters[*str - 'a']);
+            put_morse_letter(led_pin, morse_letters[*str - 'a']);
         } else if (*str == ' ') {
             sleep_ms(DOT_PERIOD_MS * 4);
         }
@@ -66,10 +65,15 @@ void put_morse_str(const char *str) {
 }
 
 int main() {
+#ifndef PICO_DEFAULT_LED_PIN
+#warning picoboard/blinky example requires a board with a regular LED
+#else
+    const uint LED_PIN = PICO_DEFAULT_LED_PIN;
     gpio_init(LED_PIN);
     gpio_set_dir(LED_PIN, GPIO_OUT);
     while (true) {
-        put_morse_str("Hello world");
+        put_morse_str(LED_PIN, "Hello world");
         sleep_ms(1000);
     }
+#endif
 }
diff --git a/picoboard/button/button.c b/picoboard/button/button.c
index b113533..6a5a5dd 100644
--- a/picoboard/button/button.c
+++ b/picoboard/button/button.c
@@ -54,7 +54,7 @@ bool __no_inline_not_in_flash_func(get_bootsel_button)() {
 
 int main() {
 #ifndef PICO_DEFAULT_LED_PIN
-#warning picobooard/button example requires a board with a regular LED
+#warning picoboard/button example requires a board with a regular LED
 #else
     gpio_init(PICO_DEFAULT_LED_PIN);
     gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
diff --git a/pio/pwm/pwm.c b/pio/pwm/pwm.c
index f1cc46d..c3148a6 100644
--- a/pio/pwm/pwm.c
+++ b/pio/pwm/pwm.c
@@ -26,6 +26,10 @@ void pio_pwm_set_level(PIO pio, uint sm, uint32_t level) {
 
 int main() {
     stdio_init_all();
+#ifndef PICO_DEFAULT_LED_PIN
+#warning pio/pwm example requires a board with a regular LED
+    puts("Default LED pin was not defined");
+#else
 
     // todo get free sm
     PIO pio = pio0;
@@ -43,4 +47,5 @@ int main() {
         level = (level + 1) % 256;
         sleep_ms(10);
     }
+#endif
 }
diff --git a/system/hello_double_tap/hello_double_tap.c b/system/hello_double_tap/hello_double_tap.c
index e64e8ae..bc06bf6 100644
--- a/system/hello_double_tap/hello_double_tap.c
+++ b/system/hello_double_tap/hello_double_tap.c
@@ -13,6 +13,9 @@
 // `pico_bootsel_via_double_reset` library!
 
 int main() {
+#ifndef PICO_DEFAULT_LED_PIN
+#warning system/hello_double_tap example requires a board with a regular LED
+#else
     const uint LED_PIN = PICO_DEFAULT_LED_PIN;
     gpio_init(LED_PIN);
     gpio_set_dir(LED_PIN, GPIO_OUT);
@@ -22,4 +25,5 @@ int main() {
         gpio_put(LED_PIN, 0);
         sleep_ms(250);
     }
+#endif
 }