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esp32/machine_bitstream: Reinstate bitstream bit-bang implementation.

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The bit-bang implementation was replaced with the RMT implementation in
599b61c086.  This commit brings back that
bit-bang code, and allows it to be selected via the new static method:

    esp32.RMT.bitstream_channel(None)

The bit-bang implementation may be useful if the RMT needs to be used for
something else, or if bit-banging is more stable in certain applications.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
2022-01-11 17:21:14 +11:00
parent e754c2e84f
commit a3bbd5332b
5 changed files with 119 additions and 9 deletions
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32
ports/esp32/esp32_rmt.c
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@@ -66,6 +66,10 @@ typedef struct _rmt_install_state_t {
esp_err_t ret;
} rmt_install_state_t;
// Current channel used for machine.bitstream, in the machine_bitstream_high_low_rmt
// implementation. A value of -1 means do not use RMT.
int8_t esp32_rmt_bitstream_channel_id = RMT_CHANNEL_MAX - 1;
STATIC void rmt_install_task(void *pvParameter) {
rmt_install_state_t *state = pvParameter;
state->ret = rmt_driver_install(state->channel_id, 0, 0);
@@ -104,8 +108,8 @@ STATIC mp_obj_t esp32_rmt_make_new(const mp_obj_type_t *type, size_t n_args, siz
mp_uint_t idle_level = args[3].u_bool;
mp_obj_t tx_carrier_obj = args[4].u_obj;
if (channel_id == MICROPY_HW_ESP32_RMT_CHANNEL_BITSTREAM) {
mp_raise_ValueError(MP_ERROR_TEXT("reserved channel id"));
if (esp32_rmt_bitstream_channel_id >= 0 && channel_id == esp32_rmt_bitstream_channel_id) {
mp_raise_ValueError(MP_ERROR_TEXT("channel used by bitstream"));
}
if (clock_div < 1 || clock_div > 255) {
@@ -314,6 +318,27 @@ STATIC mp_obj_t esp32_rmt_write_pulses(size_t n_args, const mp_obj_t *args) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(esp32_rmt_write_pulses_obj, 2, 3, esp32_rmt_write_pulses);
STATIC mp_obj_t esp32_rmt_bitstream_channel(size_t n_args, const mp_obj_t *args) {
if (n_args > 0) {
if (args[0] == mp_const_none) {
esp32_rmt_bitstream_channel_id = -1;
} else {
mp_int_t channel_id = mp_obj_get_int(args[0]);
if (channel_id < 0 || channel_id >= RMT_CHANNEL_MAX) {
mp_raise_ValueError(MP_ERROR_TEXT("invalid channel"));
}
esp32_rmt_bitstream_channel_id = channel_id;
}
}
if (esp32_rmt_bitstream_channel_id < 0) {
return mp_const_none;
} else {
return MP_OBJ_NEW_SMALL_INT(esp32_rmt_bitstream_channel_id);
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(esp32_rmt_bitstream_channel_fun_obj, 0, 1, esp32_rmt_bitstream_channel);
STATIC MP_DEFINE_CONST_STATICMETHOD_OBJ(esp32_rmt_bitstream_channel_obj, MP_ROM_PTR(&esp32_rmt_bitstream_channel_fun_obj));
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) },
@@ -322,6 +347,9 @@ STATIC const mp_rom_map_elem_t esp32_rmt_locals_dict_table[] = {
{ 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) },
{ MP_ROM_QSTR(MP_QSTR_write_pulses), MP_ROM_PTR(&esp32_rmt_write_pulses_obj) },
// Static methods
{ MP_ROM_QSTR(MP_QSTR_bitstream_channel), MP_ROM_PTR(&esp32_rmt_bitstream_channel_obj) },
};
STATIC MP_DEFINE_CONST_DICT(esp32_rmt_locals_dict, esp32_rmt_locals_dict_table);