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Support I2C transactions with combined reads and writes (#996)

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* Support I2C transactions with combined reads and writes

* Add optional send_stop parameter to I2CComponent::raw_end_transmission

* Add convenience methods to I2CDevice

* clang-format

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
This commit is contained in:
la7dja 2020-11-06 05:09:28 +01:00 committed by GitHub
parent 051a1e4772
commit 7221337442
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2 changed files with 14 additions and 3 deletions
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4
esphome/components/i2c/i2c.cpp
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@ -56,8 +56,8 @@ void I2CComponent::raw_begin_transmission(uint8_t address) {
ESP_LOGVV(TAG, "Beginning Transmission to 0x%02X:", address);
this->wire_->beginTransmission(address);
}
bool I2CComponent::raw_end_transmission(uint8_t address) {
uint8_t status = this->wire_->endTransmission();
bool I2CComponent::raw_end_transmission(uint8_t address, bool send_stop) {
uint8_t status = this->wire_->endTransmission(send_stop);
ESP_LOGVV(TAG, " Transmission ended. Status code: 0x%02X", status);
switch (status) {

13
esphome/components/i2c/i2c.h
View file

@ -94,7 +94,7 @@ class I2CComponent : public Component {
void raw_begin_transmission(uint8_t address);
/// End a write transmission to an address, return true if successful.
bool raw_end_transmission(uint8_t address);
bool raw_end_transmission(uint8_t address, bool send_stop = true);
/** Request data from an address with a number of (8-bit) bytes.
*
@ -173,6 +173,17 @@ class I2CDevice {
I2CRegister reg(uint8_t a_register) { return {this, a_register}; }
/// Begin a write transmission.
void raw_begin_transmission() { this->parent_->raw_begin_transmission(this->address_); };
/// End a write transmission, return true if successful.
bool raw_end_transmission(bool send_stop = true) {
return this->parent_->raw_end_transmission(this->address_, send_stop);
};
/// Write len amount of bytes from data. begin_transmission_ must be called before this.
void raw_write(const uint8_t *data, uint8_t len) { this->parent_->raw_write(this->address_, data, len); };
/** Read len amount of bytes from a register into data. Optionally with a conversion time after
* writing the register value to the bus.
*