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esp32/esp32_rmt: Change RMT.source_freq() to class method. 

To create an esp32.RMT() instance with an optimum (i.e. highest resolution)
clock_div is currently awkward because you need to know the source clock
frequency to calculate the best clock_div, but unfortunately that is only
currently available as an source_freq() method on the instance after you
have already created it.  So RMT.source_freq() should really be a class
method, not an instance method.  This change is backwards compatible for
existing code because you can still reference that function from an
instance, or now also, from the class.

Signed-off-by: Mark Blakeney <mark.blakeney@bullet-systems.net>
This commit is contained in:
Mark Blakeney 2023-10-24 10:24:26 +10:00 committed by Damien George
parent f07f90f1ab
commit fbb7c32040
2 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
docs/library/esp32.rst
View File

@ -226,7 +226,7 @@ For more details see Espressif's `ESP-IDF RMT documentation.
``100``) and the output level to apply the carrier to (a boolean as per
*idle_level*).
.. method:: RMT.source_freq()
.. classmethod:: RMT.source_freq()
Returns the source clock frequency. Currently the source clock is not
configurable so this will always return 80MHz.

9
ports/esp32/esp32_rmt.c
View File

@ -206,10 +206,11 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(esp32_rmt_deinit_obj, esp32_rmt_deinit);
// Return the source frequency.
// Currently only the APB clock (80MHz) can be used but it is possible other
// clock sources will added in the future.
STATIC mp_obj_t esp32_rmt_source_freq(mp_obj_t self_in) {
STATIC mp_obj_t esp32_rmt_source_freq() {
return mp_obj_new_int(APB_CLK_FREQ);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(esp32_rmt_source_freq_obj, esp32_rmt_source_freq);
STATIC MP_DEFINE_CONST_FUN_OBJ_0(esp32_rmt_source_freq_obj, esp32_rmt_source_freq);
STATIC MP_DEFINE_CONST_STATICMETHOD_OBJ(esp32_rmt_source_obj, MP_ROM_PTR(&esp32_rmt_source_freq_obj));
// Return the clock divider.
STATIC mp_obj_t esp32_rmt_clock_div(mp_obj_t self_in) {
@ -357,7 +358,6 @@ STATIC MP_DEFINE_CONST_STATICMETHOD_OBJ(esp32_rmt_bitstream_channel_obj, MP_ROM_
STATIC const mp_rom_map_elem_t esp32_rmt_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&esp32_rmt_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&esp32_rmt_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR_source_freq), MP_ROM_PTR(&esp32_rmt_source_freq_obj) },
{ MP_ROM_QSTR(MP_QSTR_clock_div), MP_ROM_PTR(&esp32_rmt_clock_div_obj) },
{ MP_ROM_QSTR(MP_QSTR_wait_done), MP_ROM_PTR(&esp32_rmt_wait_done_obj) },
{ MP_ROM_QSTR(MP_QSTR_loop), MP_ROM_PTR(&esp32_rmt_loop_obj) },
@ -365,6 +365,9 @@ STATIC const mp_rom_map_elem_t esp32_rmt_locals_dict_table[] = {
// Static methods
{ MP_ROM_QSTR(MP_QSTR_bitstream_channel), MP_ROM_PTR(&esp32_rmt_bitstream_channel_obj) },
// Class methods
{ MP_ROM_QSTR(MP_QSTR_source_freq), MP_ROM_PTR(&esp32_rmt_source_obj) },
};
STATIC MP_DEFINE_CONST_DICT(esp32_rmt_locals_dict, esp32_rmt_locals_dict_table);