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[ble_client] Optimize ble_write memory usage - store static data in flash

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This commit is contained in:
J. Nick Koston
2025-11-08 21:41:17 -06:00
parent b61027607f
commit 0d4a6fa350
2 changed files with 22 additions and 23 deletions
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8
esphome/components/ble_client/__init__.py
View File

@@ -15,6 +15,7 @@ from esphome.const import (
CONF_TRIGGER_ID,
CONF_VALUE,
)
from esphome.core import ID
AUTO_LOAD = ["esp32_ble_client"]
CODEOWNERS = ["@buxtronix", "@clydebarrow"]
@@ -198,7 +199,12 @@ async def ble_write_to_code(config, action_id, template_arg, args):
templ = await cg.templatable(value, args, cg.std_vector.template(cg.uint8))
cg.add(var.set_value_template(templ))
else:
cg.add(var.set_value_simple(value))
# Generate static array in flash to avoid RAM copy
if isinstance(value, bytes):
value = list(value)
arr_id = ID(f"{action_id}_data", is_declaration=True, type=cg.uint8)
arr = cg.static_const_array(arr_id, cg.ArrayInitializer(*value))
cg.add(var.set_value_simple(arr, len(value)))
if len(config[CONF_SERVICE_UUID]) == len(esp32_ble_tracker.bt_uuid16_format):
cg.add(

37
esphome/components/ble_client/automation.h
View File

@@ -96,11 +96,8 @@ template<typename... Ts> class BLEClientWriteAction : public Action<Ts...>, publ
BLEClientWriteAction(BLEClient *ble_client) {
ble_client->register_ble_node(this);
ble_client_ = ble_client;
this->construct_simple_value_();
}
~BLEClientWriteAction() { this->destroy_simple_value_(); }
void set_service_uuid16(uint16_t uuid) { this->service_uuid_ = espbt::ESPBTUUID::from_uint16(uuid); }
void set_service_uuid32(uint32_t uuid) { this->service_uuid_ = espbt::ESPBTUUID::from_uint32(uuid); }
void set_service_uuid128(uint8_t *uuid) { this->service_uuid_ = espbt::ESPBTUUID::from_raw(uuid); }
@@ -110,16 +107,14 @@ template<typename... Ts> class BLEClientWriteAction : public Action<Ts...>, publ
void set_char_uuid128(uint8_t *uuid) { this->char_uuid_ = espbt::ESPBTUUID::from_raw(uuid); }
void set_value_template(std::vector<uint8_t> (*func)(Ts...)) {
this->destroy_simple_value_();
this->value_.template_func = func;
this->has_simple_value_ = false;
}
void set_value_simple(const std::vector<uint8_t> &value) {
if (!this->has_simple_value_) {
this->construct_simple_value_();
}
this->value_.simple = value;
// Store pointer to static data in flash (no RAM copy)
void set_value_simple(const uint8_t *data, size_t len) {
this->value_.simple_data.ptr = data;
this->value_.simple_data.len = len;
this->has_simple_value_ = true;
}
@@ -128,7 +123,12 @@ template<typename... Ts> class BLEClientWriteAction : public Action<Ts...>, publ
void play_complex(const Ts &...x) override {
this->num_running_++;
this->var_ = std::make_tuple(x...);
auto value = this->has_simple_value_ ? this->value_.simple : this->value_.template_func(x...);
std::vector<uint8_t> value;
if (this->has_simple_value_) {
value.assign(this->value_.simple_data.ptr, this->value_.simple_data.ptr + this->value_.simple_data.len);
} else {
value = this->value_.template_func(x...);
}
// on write failure, continue the automation chain rather than stopping so that e.g. disconnect can work.
if (!write(value))
this->play_next_(x...);
@@ -201,21 +201,14 @@ template<typename... Ts> class BLEClientWriteAction : public Action<Ts...>, publ
}
private:
void construct_simple_value_() { new (&this->value_.simple) std::vector<uint8_t>(); }
void destroy_simple_value_() {
if (this->has_simple_value_) {
this->value_.simple.~vector();
}
}
BLEClient *ble_client_;
bool has_simple_value_ = true;
bool has_simple_value_{true};
union Value {
std::vector<uint8_t> simple;
std::vector<uint8_t> (*template_func)(Ts...);
Value() {} // trivial constructor
~Value() {} // trivial destructor - we manage lifetime via discriminator
struct {
const uint8_t *ptr;
size_t len;
} simple_data;
} value_;
espbt::ESPBTUUID service_uuid_;
espbt::ESPBTUUID char_uuid_;