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Add read/write for 16bit registers (#4844)

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Carson Full 2023-06-18 21:10:05 -05:00 committed by GitHub
parent c151df32bc
commit 67771abc9d
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2 changed files with 61 additions and 0 deletions
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39
esphome/components/i2c/i2c.cpp
View file

@ -14,6 +14,14 @@ ErrorCode I2CDevice::read_register(uint8_t a_register, uint8_t *data, size_t len
return bus_->read(address_, data, len);
}
ErrorCode I2CDevice::read_register16(uint16_t a_register, uint8_t *data, size_t len, bool stop) {
a_register = convert_big_endian(a_register);
ErrorCode const err = this->write(reinterpret_cast<const uint8_t *>(&a_register), 2, stop);
if (err != ERROR_OK)
return err;
return bus_->read(address_, data, len);
}
ErrorCode I2CDevice::write_register(uint8_t a_register, const uint8_t *data, size_t len, bool stop) {
WriteBuffer buffers[2];
buffers[0].data = &a_register;
@ -23,6 +31,16 @@ ErrorCode I2CDevice::write_register(uint8_t a_register, const uint8_t *data, siz
return bus_->writev(address_, buffers, 2, stop);
}
ErrorCode I2CDevice::write_register16(uint16_t a_register, const uint8_t *data, size_t len, bool stop) {
a_register = convert_big_endian(a_register);
WriteBuffer buffers[2];
buffers[0].data = reinterpret_cast<const uint8_t *>(&a_register);
buffers[0].len = 2;
buffers[1].data = data;
buffers[1].len = len;
return bus_->writev(address_, buffers, 2, stop);
}
bool I2CDevice::read_bytes_16(uint8_t a_register, uint16_t *data, uint8_t len) {
if (read_register(a_register, reinterpret_cast<uint8_t *>(data), len * 2) != ERROR_OK)
return false;
@ -60,5 +78,26 @@ uint8_t I2CRegister::get() const {
return value;
}
I2CRegister16 &I2CRegister16::operator=(uint8_t value) {
this->parent_->write_register16(this->register_, &value, 1);
return *this;
}
I2CRegister16 &I2CRegister16::operator&=(uint8_t value) {
value &= get();
this->parent_->write_register16(this->register_, &value, 1);
return *this;
}
I2CRegister16 &I2CRegister16::operator|=(uint8_t value) {
value |= get();
this->parent_->write_register16(this->register_, &value, 1);
return *this;
}
uint8_t I2CRegister16::get() const {
uint8_t value = 0x00;
this->parent_->read_register16(this->register_, &value, 1);
return value;
}
} // namespace i2c
} // namespace esphome

22
esphome/components/i2c/i2c.h
View file

@ -31,6 +31,25 @@ class I2CRegister {
uint8_t register_;
};
class I2CRegister16 {
public:
I2CRegister16 &operator=(uint8_t value);
I2CRegister16 &operator&=(uint8_t value);
I2CRegister16 &operator|=(uint8_t value);
explicit operator uint8_t() const { return get(); }
uint8_t get() const;
protected:
friend class I2CDevice;
I2CRegister16(I2CDevice *parent, uint16_t a_register) : parent_(parent), register_(a_register) {}
I2CDevice *parent_;
uint16_t register_;
};
// like ntohs/htons but without including networking headers.
// ("i2c" byte order is big-endian)
inline uint16_t i2ctohs(uint16_t i2cshort) { return convert_big_endian(i2cshort); }
@ -44,12 +63,15 @@ class I2CDevice {
void set_i2c_bus(I2CBus *bus) { bus_ = bus; }
I2CRegister reg(uint8_t a_register) { return {this, a_register}; }
I2CRegister16 reg16(uint16_t a_register) { return {this, a_register}; }
ErrorCode read(uint8_t *data, size_t len) { return bus_->read(address_, data, len); }
ErrorCode read_register(uint8_t a_register, uint8_t *data, size_t len, bool stop = true);
ErrorCode read_register16(uint16_t a_register, uint8_t *data, size_t len, bool stop = true);
ErrorCode write(const uint8_t *data, uint8_t len, bool stop = true) { return bus_->write(address_, data, len, stop); }
ErrorCode write_register(uint8_t a_register, const uint8_t *data, size_t len, bool stop = true);
ErrorCode write_register16(uint16_t a_register, const uint8_t *data, size_t len, bool stop = true);
// Compat APIs