Daniel KentandJonathan Swoboda
9260401747
Co-authored-by: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
#include <cstdint>
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#include <cstddef>
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#include "bmp581_spi.h"
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#include "esphome/components/bmp581_base/bmp581_base.h"
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#include "esphome/components/spi/spi.h"
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namespace esphome::bmp581_spi {
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static const char *const TAG = "bmp581_spi";
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// OR (|) register with BMP_SPI_READ for read
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inline constexpr uint8_t BMP_SPI_READ = 0x80;
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// AND (&) register with BMP_SPI_WRITE for write
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inline constexpr uint8_t BMP_SPI_WRITE = 0x7F;
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void BMP581SPIComponent::dump_config() {
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BMP581Component::dump_config();
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LOG_SPI_DEVICE(this);
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}
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void BMP581SPIComponent::setup() {
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this->spi_setup();
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BMP581Component::setup();
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}
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void BMP581SPIComponent::activate_interface() {
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// - forces the device into SPI mode using a dummy read
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uint8_t dummy_read = 0;
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this->bmp_read_byte(bmp581_base::BMP581_CHIP_ID, &dummy_read);
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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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// The expressions BMP_SPI_READ (| with register) and BMP_SPI_WRITE (& with register)
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// are defined for readability.
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// https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp581-ds004.pdf
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bool BMP581SPIComponent::bmp_read_byte(uint8_t a_register, uint8_t *data) {
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this->enable();
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this->transfer_byte(a_register | BMP_SPI_READ);
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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 BMP581SPIComponent::bmp_write_byte(uint8_t a_register, uint8_t data) {
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this->enable();
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this->transfer_byte(a_register & BMP_SPI_WRITE);
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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 BMP581SPIComponent::bmp_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(a_register | BMP_SPI_READ);
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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 BMP581SPIComponent::bmp_write_bytes(uint8_t a_register, uint8_t *data, size_t len) {
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this->enable();
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this->transfer_byte(a_register & BMP_SPI_WRITE);
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this->write_array(data, len);
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this->disable();
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return true;
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}
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} // namespace esphome::bmp581_spi
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