Support and detect Pi-Pico pinouts programmatically

nopjne · Nov 2, 2024 · 90b6938 · 90b6938
1 parent 1b37868
commit 90b6938
Show file tree

Hide file tree

Showing 2 changed files with 25 additions and 2 deletions.
diff --git a/src/n64cartinterface.c b/src/n64cartinterface.c
@@ -46,6 +46,7 @@ uint16_t gGameTitle[0x16];
 uint16_t gGameCode[6];
 uint32_t gChecksum;
 const char* gCICName;
+bool gGpioRemap = false;
 
 void set_ad_input() {
     for(uint32_t i = 0; i < 16; i++) {
@@ -174,7 +175,21 @@ void cartio_init()
     // Read start address, assert that the retured value is something valid.
     set_address(CART_ADDRESS_START);
     uint32_t read = (((uint32_t)read16()) << 16) | (read16());
+    if (read != 0x80371240) {
+        gGpioRemap = true;
+        // Force setup.
+        gpio_init(N64_ALEL);
+        gpio_set_dir(N64_ALEL, true);
+        gpio_put(N64_ALEL, false);
+        gpio_set_pulls(N64_ALEL, true, false);
+        sleep_ms(300);
+        set_address(CART_ADDRESS_START);
+        read = (((uint32_t)read16()) << 16) | (read16());
+    }
+
     assert(read == 0x80371240);
+
+    // Hang is coudn't header.
     while(read != 0x80371240) {
         gpio_put(PICO_DEFAULT_LED_PIN, true);
         sleep_ms(100);

diff --git a/src/n64cartinterface.h b/src/n64cartinterface.h
@@ -19,8 +19,16 @@
 #define N64_CIC_DCLK   (20)
 #define N64_CIC_DIO    (21)
 #define N64_COLD_RESET (22)
-#define N64_ALEL       (27)
-#define N64_ALEH       (28)
+#define N64_ALEL_INIT  (27)
+#define N64_ALEH_INIT  (28)
+#define N64_ALEL_PI    (26)
+#define N64_ALEH_PI    (27)
+
+
+#define N64_ALEL       ((gGpioRemap == false) ? N64_ALEL_INIT : N64_ALEL_PI)
+#define N64_ALEH       ((gGpioRemap == false) ? N64_ALEH_INIT : N64_ALEH_PI)
+
+extern bool gGpioRemap;
 
 #define READ_LOW_DELAY_NS (133 / 4) // 133 = 1us 1us / 5 = ~300ns