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extmod/machine_i2c: Rewrite i2c.scan in terms of C-level protocol.

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This commit is contained in:
Damien George 2016-11-23 12:13:14 +11:00
parent bc4ea69795
commit c81247f1ab
1 changed files with 5 additions and 7 deletions
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12
extmod/machine_i2c.c
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@ -293,16 +293,14 @@ STATIC mp_obj_t machine_i2c_obj_init(size_t n_args, const mp_obj_t *args, mp_map
MP_DEFINE_CONST_FUN_OBJ_KW(machine_i2c_init_obj, 1, machine_i2c_obj_init);
STATIC mp_obj_t machine_i2c_scan(mp_obj_t self_in) {
machine_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_obj_base_t *self = MP_OBJ_TO_PTR(self_in);
mp_machine_i2c_p_t *i2c_p = (mp_machine_i2c_p_t*)self->type->protocol;
mp_obj_t list = mp_obj_new_list(0, NULL);
// 7-bit addresses 0b0000xxx and 0b1111xxx are reserved
for (int addr = 0x08; addr < 0x78; ++addr) {
if (mp_hal_i2c_start(self)) {
int ack = mp_hal_i2c_write_byte(self, (addr << 1));
if (ack) {
mp_obj_list_append(list, MP_OBJ_NEW_SMALL_INT(addr));
}
mp_hal_i2c_stop(self); // ignore error
int ret = i2c_p->writeto(self, addr, NULL, 0, true);
if (ret == 0) {
mp_obj_list_append(list, MP_OBJ_NEW_SMALL_INT(addr));
}
}
return list;