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Code Issues Releases Wiki Activity

Implement variable length single word SPI writes. (#5678)

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This commit is contained in:
Clyde Stubbs
2023-11-27 07:54:12 +11:00
committed by GitHub
parent dbdcb39af9
commit 2e6d01ddff
3 changed files with 46 additions and 14 deletions
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30
esphome/components/spi/spi_esp_idf.cpp
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@@ -72,7 +72,11 @@ class SPIDelegateHw : public SPIDelegate {
desc.rxlength = this->write_only_ ? 0 : partial * 8;
desc.tx_buffer = txbuf;
desc.rx_buffer = rxbuf;
esp_err_t const err = spi_device_transmit(this->handle_, &desc);
// polling is used as it has about 10% less overhead than queuing an interrupt transfer
esp_err_t err = spi_device_polling_start(this->handle_, &desc, portMAX_DELAY);
if (err == ESP_OK) {
err = spi_device_polling_end(this->handle_, portMAX_DELAY);
}
if (err != ESP_OK) {
ESP_LOGE(TAG, "Transmit failed - err %X", err);
break;
@@ -85,6 +89,21 @@ class SPIDelegateHw : public SPIDelegate {
}
}
void write(uint16_t data, size_t num_bits) override {
spi_transaction_ext_t desc = {};
desc.command_bits = num_bits;
desc.base.flags = SPI_TRANS_VARIABLE_CMD;
desc.base.cmd = data;
esp_err_t err = spi_device_polling_start(this->handle_, (spi_transaction_t *) &desc, portMAX_DELAY);
if (err == ESP_OK) {
err = spi_device_polling_end(this->handle_, portMAX_DELAY);
}
if (err != ESP_OK) {
ESP_LOGE(TAG, "Transmit failed - err %X", err);
}
}
void transfer(uint8_t *ptr, size_t length) override { this->transfer(ptr, ptr, length); }
uint8_t transfer(uint8_t data) override {
@@ -93,14 +112,7 @@ class SPIDelegateHw : public SPIDelegate {
return rxbuf;
}
void write16(uint16_t data) override {
if (this->bit_order_ == BIT_ORDER_MSB_FIRST) {
uint16_t txbuf = SPI_SWAP_DATA_TX(data, 16);
this->transfer((uint8_t *) &txbuf, nullptr, 2);
} else {
this->transfer((uint8_t *) &data, nullptr, 2);
}
}
void write16(uint16_t data) override { this->write(data, 16); }
void write_array(const uint8_t *ptr, size_t length) override { this->transfer(ptr, nullptr, length); }