mirror of https://github.com/esphome/esphome.git
67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
#include <cstdint>
|
||
#include <cstddef>
|
||
|
||
#include "bme280_spi.h"
|
||
#include <esphome/components/bme280_base/bme280_base.h>
|
||
|
||
int set_bit(uint8_t num, int position) {
|
||
int mask = 1 << position;
|
||
return num | mask;
|
||
}
|
||
|
||
int clear_bit(uint8_t num, int position) {
|
||
int mask = 1 << position;
|
||
return num & ~mask;
|
||
}
|
||
|
||
namespace esphome {
|
||
namespace bme280_spi {
|
||
|
||
void BME280SPIComponent::setup() {
|
||
this->spi_setup();
|
||
BME280Component::setup();
|
||
};
|
||
|
||
// In SPI mode, only 7 bits of the register addresses are used; the MSB of register address is not used
|
||
// and replaced by a read/write bit (RW = ‘0’ for write and RW = ‘1’ for read).
|
||
// Example: address 0xF7 is accessed by using SPI register address 0x77. For write access, the byte
|
||
// 0x77 is transferred, for read access, the byte 0xF7 is transferred.
|
||
// https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf
|
||
|
||
bool BME280SPIComponent::read_byte(uint8_t a_register, uint8_t *data) {
|
||
this->enable();
|
||
// cause: *data = this->delegate_->transfer(tmp) doesnt work
|
||
this->delegate_->transfer(set_bit(a_register, 7));
|
||
*data = this->delegate_->transfer(0);
|
||
this->disable();
|
||
return true;
|
||
}
|
||
|
||
bool BME280SPIComponent::write_byte(uint8_t a_register, uint8_t data) {
|
||
this->enable();
|
||
this->delegate_->transfer(clear_bit(a_register, 7));
|
||
this->delegate_->transfer(data);
|
||
this->disable();
|
||
return true;
|
||
}
|
||
|
||
bool BME280SPIComponent::read_bytes(uint8_t a_register, uint8_t *data, size_t len) {
|
||
this->enable();
|
||
this->delegate_->transfer(set_bit(a_register, 7));
|
||
this->delegate_->read_array(data, len);
|
||
this->disable();
|
||
return true;
|
||
}
|
||
|
||
bool BME280SPIComponent::read_byte_16(uint8_t a_register, uint16_t *data) {
|
||
this->enable();
|
||
this->delegate_->transfer(set_bit(a_register, 7));
|
||
((uint8_t *) data)[1] = this->delegate_->transfer(0);
|
||
((uint8_t *) data)[0] = this->delegate_->transfer(0);
|
||
this->disable();
|
||
return true;
|
||
}
|
||
|
||
} // namespace bme280_spi
|
||
} // namespace esphome
|