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extmod/machine_i2c: Add hook to constructor to call port-specific code.

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If MICROPY_PY_MACHINE_I2C_MAKE_NEW is defined then it is called when an
I2C object is constructed with an id which is not -1.
This commit is contained in:
Damien George 2016-11-24 00:12:51 +11:00
parent 8b74048d2a
commit 5d2279bec1
1 changed files with 16 additions and 1 deletions
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17
extmod/machine_i2c.c
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@ -286,7 +286,22 @@ STATIC void machine_i2c_obj_init_helper(machine_i2c_obj_t *self, mp_uint_t n_arg
}
STATIC mp_obj_t machine_i2c_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 0, MP_OBJ_FUN_ARGS_MAX, true);
// check the id argument, if given
if (n_args > 0) {
if (args[0] != MP_OBJ_NEW_SMALL_INT(-1)) {
#if defined(MICROPY_PY_MACHINE_I2C_MAKE_NEW)
// dispatch to port-specific constructor
extern mp_obj_t MICROPY_PY_MACHINE_I2C_MAKE_NEW(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args);
return MICROPY_PY_MACHINE_I2C_MAKE_NEW(type, n_args, n_kw, args);
#else
mp_raise_ValueError("invalid I2C peripheral");
#endif
}
--n_args;
++args;
}
// create new soft I2C object
machine_i2c_obj_t *self = m_new_obj(machine_i2c_obj_t);
self->base.type = &machine_i2c_type;
mp_map_t kw_args;