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69 lines
1.7 KiB
C++
69 lines
1.7 KiB
C++
#pragma once
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#include <cstdint>
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#include <cstddef>
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#include <utility>
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#include <vector>
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namespace esphome {
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namespace i2c {
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enum ErrorCode {
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ERROR_OK = 0,
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ERROR_INVALID_ARGUMENT = 1,
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ERROR_NOT_ACKNOWLEDGED = 2,
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ERROR_TIMEOUT = 3,
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ERROR_NOT_INITIALIZED = 4,
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ERROR_TOO_LARGE = 5,
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ERROR_UNKNOWN = 6,
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ERROR_CRC = 7,
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};
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struct ReadBuffer {
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uint8_t *data;
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size_t len;
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};
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struct WriteBuffer {
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const uint8_t *data;
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size_t len;
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};
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class I2CBus {
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public:
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virtual ErrorCode read(uint8_t address, uint8_t *buffer, size_t len) {
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ReadBuffer buf;
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buf.data = buffer;
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buf.len = len;
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return readv(address, &buf, 1);
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}
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virtual ErrorCode readv(uint8_t address, ReadBuffer *buffers, size_t cnt) = 0;
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virtual ErrorCode write(uint8_t address, const uint8_t *buffer, size_t len) {
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return write(address, buffer, len, true);
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}
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virtual ErrorCode write(uint8_t address, const uint8_t *buffer, size_t len, bool stop) {
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WriteBuffer buf;
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buf.data = buffer;
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buf.len = len;
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return writev(address, &buf, 1, stop);
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}
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virtual ErrorCode writev(uint8_t address, WriteBuffer *buffers, size_t cnt) {
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return writev(address, buffers, cnt, true);
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}
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virtual ErrorCode writev(uint8_t address, WriteBuffer *buffers, size_t cnt, bool stop) = 0;
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protected:
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void i2c_scan_() {
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for (uint8_t address = 8; address < 120; address++) {
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auto err = writev(address, nullptr, 0);
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if (err == ERROR_OK) {
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scan_results_.emplace_back(address, true);
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} else if (err == ERROR_UNKNOWN) {
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scan_results_.emplace_back(address, false);
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}
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}
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}
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std::vector<std::pair<uint8_t, bool>> scan_results_;
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bool scan_{false};
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};
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} // namespace i2c
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} // namespace esphome
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