// stm32f4xx_prefix.c becomes the initial portion of the generated pins file.

#include <stdio.h>

#include "py/obj.h"
#include "pin.h"
#include MICROPY_HAL_H

#define AF(af_idx, af_fn, af_unit, af_type, af_ptr) \
{ \
    { &pin_af_type }, \
    .name = MP_QSTR_AF ## af_idx ## _ ## af_fn ## af_unit, \
    .idx = (af_idx), \
    .fn = AF_FN_ ## af_fn, \
    .unit = (af_unit), \
    .type = AF_PIN_TYPE_ ## af_fn ## _ ## af_type, \
    .af_fn = (af_ptr) \
}

#define PIN(p_port, p_pin, p_af, p_adc_num, p_adc_channel) \
{ \
    { &pin_type }, \
    .name = MP_QSTR_ ## p_port ## p_pin, \
    .port = PORT_ ## p_port, \
    .pin = (p_pin), \
    .num_af = (sizeof(p_af) / sizeof(pin_af_obj_t)), \
    .pin_mask = (1 << ((p_pin) & 0x0f)), \
    .gpio = GPIO ## p_port, \
    .af = p_af, \
    .adc_num = p_adc_num, \
    .adc_channel = p_adc_channel, \
}

// stm32f4xx_prefix.c becomes the initial portion of the generated pins file.

#include <stdio.h>

#include "py/obj.h"
#include "pin.h"
#include MICROPY_HAL_H

#define AF(af_idx, af_fn, af_unit, af_type, af_ptr) \
{ \
    { &pin_af_type }, \
    .name = MP_QSTR_AF ## af_idx ## _ ## af_fn ## af_unit, \
    .idx = (af_idx), \
    .fn = AF_FN_ ## af_fn, \
    .unit = (af_unit), \
    .type = AF_PIN_TYPE_ ## af_fn ## _ ## af_type, \
    .af_fn = (af_ptr) \
}

#define PIN(p_port, p_pin, p_af, p_adc_num, p_adc_channel) \
{ \
    { &pin_type }, \
    .name = MP_QSTR_ ## p_port ## p_pin, \
    .port = PORT_ ## p_port, \
    .pin = (p_pin), \
    .num_af = (sizeof(p_af) / sizeof(pin_obj_t)), \
    .pin_mask = (1 << ((p_pin) & 0x0f)), \
    .gpio = GPIO ## p_port, \
    .af = p_af, \
    .adc_num = p_adc_num, \
    .adc_channel = p_adc_channel, \
}

--- 
+++ 
@@ -23,7 +23,7 @@
     .name = MP_QSTR_ ## p_port ## p_pin, \
     .port = PORT_ ## p_port, \
     .pin = (p_pin), \
-    .num_af = (sizeof(p_af) / sizeof(pin_obj_t)), \
+    .num_af = (sizeof(p_af) / sizeof(pin_af_obj_t)), \
     .pin_mask = (1 << ((p_pin) & 0x0f)), \
     .gpio = GPIO ## p_port, \
     .af = p_af, \
stmhal/boards/stm32fxx_prefix.c: Fix alt function number calculation

This prevented pin_find_af* functions from being able to find some
of the alternate functions in the pin struct
