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[bl0942] loop and overflow cleanup (#7358)

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David Woodhouse 2024-09-04 04:38:47 +01:00 committed by GitHub
parent 1a71cc3047
commit 188faa6530
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GPG key ID: B5690EEEBB952194
2 changed files with 28 additions and 6 deletions
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32
esphome/components/bl0942/bl0942.cpp
View file

@ -41,20 +41,33 @@ static const uint32_t BL0942_REG_MODE_DEFAULT =
static const uint32_t BL0942_REG_SOFT_RESET_MAGIC = 0x5a5a5a;
static const uint32_t BL0942_REG_USR_WRPROT_MAGIC = 0x55;
// 23-byte packet, 11 bits per byte, 2400 baud: about 105ms
static const uint32_t PKT_TIMEOUT_MS = 200;
void BL0942::loop() {
DataPacket buffer;
if (!this->available()) {
int avail = this->available();
if (!avail) {
return;
}
if (avail < sizeof(buffer)) {
if (!this->rx_start_) {
this->rx_start_ = millis();
} else if (millis() > this->rx_start_ + PKT_TIMEOUT_MS) {
ESP_LOGW(TAG, "Junk on wire. Throwing away partial message (%d bytes)", avail);
this->read_array((uint8_t *) &buffer, avail);
this->rx_start_ = 0;
}
return;
}
if (this->read_array((uint8_t *) &buffer, sizeof(buffer))) {
if (this->validate_checksum_(&buffer)) {
this->received_package_(&buffer);
}
} else {
ESP_LOGW(TAG, "Junk on wire. Throwing away partial message");
while (read() >= 0)
;
}
this->rx_start_ = 0;
}
bool BL0942::validate_checksum_(DataPacket *data) {
@ -133,10 +146,17 @@ void BL0942::received_package_(DataPacket *data) {
return;
}
// cf_cnt is only 24 bits, so track overflows
uint32_t cf_cnt = (uint24_t) data->cf_cnt;
cf_cnt |= this->prev_cf_cnt_ & 0xff000000;
if (cf_cnt < this->prev_cf_cnt_) {
cf_cnt += 0x1000000;
}
this->prev_cf_cnt_ = cf_cnt;
float v_rms = (uint24_t) data->v_rms / voltage_reference_;
float i_rms = (uint24_t) data->i_rms / current_reference_;
float watt = (int24_t) data->watt / power_reference_;
uint32_t cf_cnt = (uint24_t) data->cf_cnt;
float total_energy_consumption = cf_cnt / energy_reference_;
float frequency = 1000000.0f / data->frequency;

2
esphome/components/bl0942/bl0942.h
View file

@ -67,6 +67,8 @@ class BL0942 : public PollingComponent, public uart::UARTDevice {
float energy_reference_ = BL0942_EREF;
uint8_t address_ = 0;
LineFrequency line_freq_ = LINE_FREQUENCY_50HZ;
uint32_t rx_start_ = 0;
uint32_t prev_cf_cnt_ = 0;
bool validate_checksum_(DataPacket *data);
int read_reg_(uint8_t reg);