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66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
#include <cstdint>
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#include <cstddef>
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#include "bmp280_spi.h"
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#include <esphome/components/bmp280_base/bmp280_base.h>
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namespace esphome {
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namespace bmp280_spi {
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uint8_t set_bit(uint8_t num, uint8_t position) {
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uint8_t mask = 1 << position;
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return num | mask;
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}
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uint8_t clear_bit(uint8_t num, uint8_t position) {
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uint8_t mask = 1 << position;
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return num & ~mask;
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}
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void BMP280SPIComponent::setup() {
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this->spi_setup();
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BMP280Component::setup();
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};
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// In SPI mode, only 7 bits of the register addresses are used; the MSB of register address is not used
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// and replaced by a read/write bit (RW = ‘0’ for write and RW = ‘1’ for read).
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// Example: address 0xF7 is accessed by using SPI register address 0x77. For write access, the byte
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// 0x77 is transferred, for read access, the byte 0xF7 is transferred.
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// https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp280-ds001.pdf
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bool BMP280SPIComponent::read_byte(uint8_t a_register, uint8_t *data) {
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this->enable();
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this->transfer_byte(set_bit(a_register, 7));
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*data = this->transfer_byte(0);
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this->disable();
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return true;
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}
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bool BMP280SPIComponent::write_byte(uint8_t a_register, uint8_t data) {
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this->enable();
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this->transfer_byte(clear_bit(a_register, 7));
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this->transfer_byte(data);
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this->disable();
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return true;
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}
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bool BMP280SPIComponent::read_bytes(uint8_t a_register, uint8_t *data, size_t len) {
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this->enable();
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this->transfer_byte(set_bit(a_register, 7));
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this->read_array(data, len);
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this->disable();
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return true;
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}
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bool BMP280SPIComponent::read_byte_16(uint8_t a_register, uint16_t *data) {
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this->enable();
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this->transfer_byte(set_bit(a_register, 7));
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((uint8_t *) data)[1] = this->transfer_byte(0);
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((uint8_t *) data)[0] = this->transfer_byte(0);
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this->disable();
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return true;
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}
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} // namespace bmp280_spi
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} // namespace esphome
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