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stmhal, cc3200: Change i2c.scan() method to scan addresses 0x08-0x77. 

A standard I2C address is 7 bits but addresses 0b0000xxx and 0b1111xxx
are reserved.  The scan() method is changed to reflect this, along with
the docs.
This commit is contained in:
Damien George 2016-05-02 11:15:36 +01:00
parent 26fd0ac571
commit 70ff7350e7
3 changed files with 4 additions and 4 deletions
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2
cc3200/mods/pybi2c.c
View File

@ -377,7 +377,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_i2c_deinit_obj, pyb_i2c_deinit);
STATIC mp_obj_t pyb_i2c_scan(mp_obj_t self_in) {
pyb_i2c_check_init(&pyb_i2c_obj);
mp_obj_t list = mp_obj_new_list(0, NULL);
for (uint addr = 1; addr <= 127; addr++) {
for (uint addr = 0x08; addr <= 0x77; addr++) {
for (int i = 0; i < 3; i++) {
if (pyb_i2c_scan_device(addr)) {
mp_obj_list_append(list, mp_obj_new_int(addr));

2
docs/library/machine.I2C.rst
View File

@ -106,7 +106,7 @@ Methods
.. method:: i2c.scan()
Scan all I2C addresses from 0x01 to 0x7f and return a list of those that respond.
Scan all I2C addresses between 0x08 and 0x77 inclusive and return a list of those that respond.
Only valid when in master mode.
Constants

4
stmhal/i2c.c
View File

@ -475,7 +475,7 @@ STATIC mp_obj_t pyb_i2c_is_ready(mp_obj_t self_in, mp_obj_t i2c_addr_o) {
STATIC MP_DEFINE_CONST_FUN_OBJ_2(pyb_i2c_is_ready_obj, pyb_i2c_is_ready);
/// \method scan()
/// Scan all I2C addresses from 0x01 to 0x7f and return a list of those that respond.
/// Scan all I2C addresses from 0x08 to 0x77 and return a list of those that respond.
/// Only valid when in master mode.
STATIC mp_obj_t pyb_i2c_scan(mp_obj_t self_in) {
pyb_i2c_obj_t *self = self_in;
@ -486,7 +486,7 @@ STATIC mp_obj_t pyb_i2c_scan(mp_obj_t self_in) {
mp_obj_t list = mp_obj_new_list(0, NULL);
for (uint addr = 1; addr <= 127; addr++) {
for (uint addr = 0x08; addr <= 0x77; addr++) {
for (int i = 0; i < 10; i++) {
HAL_StatusTypeDef status = HAL_I2C_IsDeviceReady(self->i2c, addr << 1, 10, 200);
if (status == HAL_OK) {