joybus: Fix first bit being skipped when console is being turned on

Author: ZenoArrows

include/joybus.pio.h

@@ -13,48 +13,54 @@
 // ------ //
 
 #define joybus_wrap_target 0
-#define joybus_wrap 22
+#define joybus_wrap 23
+#define joybus_pio_version 1
 
 #define joybus_T1 10
 #define joybus_T2 20
 #define joybus_T3 10
 
 #define joybus_offset_read 0u
-#define joybus_offset_write 5u
+#define joybus_offset_write 6u
 
 static const uint16_t joybus_program_instructions[] = {
             //     .wrap_target
-    0xe080, //  0: set    pindirs, 0                 
-    0x3320, //  1: wait   0 pin, 0               [19]
-    0x4001, //  2: in     pins, 1                    
-    0x20a0, //  3: wait   1 pin, 0                   
-    0x0001, //  4: jmp    1                          
-    0xe081, //  5: set    pindirs, 1                 
-    0xe001, //  6: set    pins, 1                    
-    0x80e0, //  7: pull   ifempty block              
-    0x6021, //  8: out    x, 1                       
-    0x00ee, //  9: jmp    !osre, 14                  
-    0x00b3, // 10: jmp    x != y, 19                 
-    0x80e0, // 11: pull   ifempty block              
-    0x6021, // 12: out    x, 1                       
-    0x000f, // 13: jmp    15                         
-    0xa342, // 14: nop                           [3] 
-    0xa142, // 15: nop                           [1] 
-    0xe900, // 16: set    pins, 0                [9] 
-    0xb201, // 17: mov    pins, x                [18]
-    0x0006, // 18: jmp    6                          
-    0xa442, // 19: nop                           [4] 
-    0xe900, // 20: set    pins, 0                [9] 
-    0xf201, // 21: set    pins, 1                [18]
-    0x0000, // 22: jmp    0                          
+    0xe080, //  0: set    pindirs, 0
+    0x20a0, //  1: wait   1 pin, 0
+    0x3320, //  2: wait   0 pin, 0               [19]
+    0x4001, //  3: in     pins, 1
+    0x20a0, //  4: wait   1 pin, 0
+    0x0002, //  5: jmp    2
+    0xe081, //  6: set    pindirs, 1
+    0xe001, //  7: set    pins, 1
+    0x80e0, //  8: pull   ifempty block
+    0x6021, //  9: out    x, 1
+    0x00ef, // 10: jmp    !osre, 15
+    0x00b4, // 11: jmp    x != y, 20
+    0x80e0, // 12: pull   ifempty block
+    0x6021, // 13: out    x, 1
+    0x0010, // 14: jmp    16
+    0xa342, // 15: nop                           [3]
+    0xa142, // 16: nop                           [1]
+    0xe900, // 17: set    pins, 0                [9]
+    0xb201, // 18: mov    pins, x                [18]
+    0x0007, // 19: jmp    7
+    0xa442, // 20: nop                           [4]
+    0xe900, // 21: set    pins, 0                [9]
+    0xf201, // 22: set    pins, 1                [18]
+    0x0000, // 23: jmp    0
             //     .wrap
 };
 
 #if !PICO_NO_HARDWARE
 static const struct pio_program joybus_program = {
     .instructions = joybus_program_instructions,
-    .length = 23,
+    .length = 24,
     .origin = -1,
+    .pio_version = joybus_pio_version,
+#if PICO_PIO_VERSION > 0
+    .used_gpio_ranges = 0x0
+#endif
 };
 
 static inline pio_sm_config joybus_program_get_default_config(uint offset) {

src/joybus.pio

@@ -8,6 +8,7 @@
 ; Autopush with 8 bit ISR threshold
 public read:
     set pindirs 0                   ; Set pin to input
+    wait 1 pin 0                    ; Make sure the line is high before entering the loop
 read_loop:
     wait 0 pin 0 [T1 + T2 / 2 - 1]  ; Wait for falling edge, then wait until halfway through the 2uS which represents the bit value
     in pins, 1                      ; Read bit value