Support dynamic configuration of cyw43 gpio pins

Add CYW43_PIN_WL_DYNAMIC that means cyw43 gpio pins can be changed at
runtime.

Then CYW43_PIN_WL_* calls cyw43_get_pin_wl to get the gpio out of
the array.

cyw43_set_pins_wl can be used to change the cyw43 gpio pins although
care is needed when calling this?

src/rp2_common/pico_cyw43_driver/cyw43_bus_pio_spi.c

@@ -24,9 +24,11 @@
 
 #define IRQ_SAMPLE_DELAY_NS 100
 
+#if !CYW43_PIN_WL_DYNAMIC
 // The pins should all work in the same gpio base
 static_assert((CYW43_PIN_WL_DATA_OUT < 32 && CYW43_PIN_WL_DATA_IN < 32 && CYW43_PIN_WL_CLOCK < 32) ||
     (CYW43_PIN_WL_DATA_OUT >= 16 && CYW43_PIN_WL_DATA_IN >= 16 && CYW43_PIN_WL_CLOCK >= 16), "");
+#endif
 
 #ifdef CYW43_SPI_PROGRAM_NAME
 #define SPI_PROGRAM_NAME CYW43_SPI_PROGRAM_NAME
@@ -540,3 +542,50 @@ int cyw43_write_bytes(cyw43_int_t *self, uint32_t fn, uint32_t addr, size_t len,
     }
 }
 #endif
+
+#if CYW43_PIN_WL_DYNAMIC
+
+// storage for cyw43 pins
+static uint cyw43_pin_array[CYW43_PIN_INDEX_WL_COUNT] = {
+    CYW43_DEFAULT_PIN_WL_REG_ON,
+    CYW43_DEFAULT_PIN_WL_DATA_OUT,
+    CYW43_DEFAULT_PIN_WL_DATA_IN,
+    CYW43_DEFAULT_PIN_WL_HOST_WAKE,
+    CYW43_DEFAULT_PIN_WL_CLOCK,
+    CYW43_DEFAULT_PIN_WL_CS
+};
+
+// Check the cyw43 gpio pin array is valid
+static bool cyw43_pins_valid(uint pins[CYW43_PIN_INDEX_WL_COUNT]) {
+    // check the gpios are valid
+    for(int i = 0; i < CYW43_PIN_INDEX_WL_COUNT; i++) {
+        if (pins[i] >= NUM_BANK0_GPIOS) {
+            return false;
+        }
+    }
+    // These pins should use the same gpio base
+    return (pins[CYW43_PIN_INDEX_WL_DATA_OUT] < 32 && pins[CYW43_PIN_INDEX_WL_DATA_IN] < 32 && pins[CYW43_PIN_INDEX_WL_CLOCK] < 32) ||
+        (pins[CYW43_PIN_INDEX_WL_DATA_OUT] >= 16 && pins[CYW43_PIN_INDEX_WL_DATA_IN] >= 16 && pins[CYW43_PIN_INDEX_WL_CLOCK] >= 16);
+}
+
+// Set the gpio pin array
+int cyw43_set_pins_wl(uint pins[CYW43_PIN_INDEX_WL_COUNT]) {
+    assert(!bus_data_instance.pio);
+    if (bus_data_instance.pio) {
+        return PICO_ERROR_RESOURCE_IN_USE;
+    }
+    assert(cyw43_pins_valid(pins));
+    if (!cyw43_pins_valid(pins)) {
+        return PICO_ERROR_INVALID_ARG;
+    }
+    memcpy(cyw43_pin_array, pins, sizeof(cyw43_pin_array));
+    return PICO_OK;
+}
+
+// Get a gpio pin
+uint cyw43_get_pin_wl(cyw43_pin_index_t pin_id) {
+    assert(pin_id < CYW43_PIN_INDEX_WL_COUNT);
+    assert(cyw43_pin_array[pin_id] < NUM_BANK0_GPIOS);
+    return cyw43_pin_array[pin_id];
+}
+#endif // CYW43_PIN_WL_DYNAMIC

src/rp2_common/pico_cyw43_driver/include/cyw43_configport.h

@@ -120,12 +120,39 @@ static inline uint32_t cyw43_hal_ticks_ms(void) {
 #define CYW43_DEFAULT_PIN_WL_CS 25u
 #endif
 
+// PICO_CONFIG: CYW43_PIN_WL_DYNAMIC, flag to indicate if cyw43 SPI pins can be changed at runtime, type=bool, default=false, advanced=true, group=pico_cyw43_driver
+#ifndef CYW43_PIN_WL_DYNAMIC
+#define CYW43_PIN_WL_DYNAMIC 0
+#endif
+
+#if CYW43_PIN_WL_DYNAMIC
+// these are just an index into an array
+typedef enum cyw43_pin_index_t {
+    CYW43_PIN_INDEX_WL_REG_ON,
+    CYW43_PIN_INDEX_WL_DATA_OUT,
+    CYW43_PIN_INDEX_WL_DATA_IN,
+    CYW43_PIN_INDEX_WL_HOST_WAKE,
+    CYW43_PIN_INDEX_WL_CLOCK,
+    CYW43_PIN_INDEX_WL_CS,
+    CYW43_PIN_INDEX_WL_COUNT // last
+} cyw43_pin_index_t;
+#define CYW43_PIN_WL_REG_ON cyw43_get_pin_wl(CYW43_PIN_INDEX_WL_REG_ON)
+#define CYW43_PIN_WL_DATA_OUT cyw43_get_pin_wl(CYW43_PIN_INDEX_WL_DATA_OUT)
+#define CYW43_PIN_WL_DATA_IN cyw43_get_pin_wl(CYW43_PIN_INDEX_WL_DATA_IN)
+#define CYW43_PIN_WL_HOST_WAKE cyw43_get_pin_wl(CYW43_PIN_INDEX_WL_HOST_WAKE)
+#define CYW43_PIN_WL_CLOCK cyw43_get_pin_wl(CYW43_PIN_INDEX_WL_CLOCK)
+#define CYW43_PIN_WL_CS cyw43_get_pin_wl(CYW43_PIN_INDEX_WL_CS)
+// Lookup the gpio value in an array
+uint cyw43_get_pin_wl(cyw43_pin_index_t pin_id);
+#else
+// Just return the gpio number configured at build time
 #define CYW43_PIN_WL_REG_ON CYW43_DEFAULT_PIN_WL_REG_ON
 #define CYW43_PIN_WL_DATA_OUT CYW43_DEFAULT_PIN_WL_DATA_OUT
 #define CYW43_PIN_WL_DATA_IN CYW43_DEFAULT_PIN_WL_DATA_IN
 #define CYW43_PIN_WL_HOST_WAKE CYW43_DEFAULT_PIN_WL_HOST_WAKE
 #define CYW43_PIN_WL_CLOCK CYW43_DEFAULT_PIN_WL_CLOCK
 #define CYW43_PIN_WL_CS CYW43_DEFAULT_PIN_WL_CS
+#endif // !CYW43_PIN_WL_DYNAMIC
 
 static inline int cyw43_hal_pin_read(cyw43_hal_pin_obj_t pin) {
     return gpio_get(pin);

src/rp2_common/pico_cyw43_driver/include/pico/cyw43_driver.h

@@ -16,6 +16,10 @@
 
 #include "pico.h"
 
+#if CYW43_PIN_WL_DYNAMIC
+#include "cyw43_configport.h"
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -73,6 +77,21 @@ void cyw43_driver_deinit(struct async_context *context);
 void cyw43_set_pio_clock_divisor(uint16_t clock_div_int, uint8_t clock_div_frac);
 #endif
 
+#if CYW43_PIN_WL_DYNAMIC
+/*! \brief Set the gpio pins for the communication with the cyw43 device
+ *  \ingroup pico_cyw43_driver
+ *
+ * Set or change the pins used to communicate with the cyw43 device
+ * This function is only available if \ref CYW43_PIN_WL_DYNAMIC is true
+ *
+ * \note The cyw43 driver should not be de-initialised before this function is called or else the behaviour is undefined.
+ *
+ * \param pins An array containing the gpio pins to use
+ * \return PICO_OK if the pin configuration could be changed and is valid
+*/
+int cyw43_set_pins_wl(uint pins[CYW43_PIN_INDEX_WL_COUNT]);
+#endif
+
 #ifdef __cplusplus
 }
 #endif