feat: Implement MideaUART protocol layer with encoding/decoding, timing control, and AC command set
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225
src/midea_protocol.c
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225
src/midea_protocol.c
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#include "midea_protocol.h"
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#include <stddef.h>
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#include <stdio.h>
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// Initialize control structure with default values
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void midea_control_init(midea_control_t *control) {
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if (control == NULL) {
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return;
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}
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control->mode = MODE_OFF;
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control->target_temp = 0; // 0.0°C
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control->mode_change = 0;
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control->temp_change = 0;
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control->pwm_arg = 0;
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control->power_state = 0; // OFF
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control->presets = 0;
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}
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// Set the AC mode
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void midea_control_set_mode(midea_control_t *control, midea_mode_t mode) {
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if (control == NULL) {
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return;
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}
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control->mode = mode;
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control->mode_change = 1; // Indicate that mode needs to be sent
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}
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// Set the target temperature in Celsius
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void midea_control_set_temperature(midea_control_t *control, float temperature_celsius) {
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if (control == NULL) {
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return;
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}
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// Convert from Celsius to 0.01°C resolution (multiply by 100)
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control->target_temp = (int16_t)(temperature_celsius * 100.0f);
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control->temp_change = 1; // Indicate that temperature needs to be sent
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}
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// Set the power state
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void midea_control_set_power(midea_control_t *control, bool power_on) {
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if (control == NULL) {
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return;
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}
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control->power_state = power_on ? 1 : 0;
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// Power state changes typically don't need explicit flags in basic implementation
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}
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// Set fan speed (PWM argument)
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void midea_control_set_fan_speed(midea_control_t *control, uint8_t speed) {
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if (control == NULL) {
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return;
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}
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control->pwm_arg = speed;
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// PWM changes typically don't need explicit flags in basic implementation
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}
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// Set preset configuration
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void midea_control_set_preset(midea_control_t *control, int16_t preset) {
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if (control == NULL) {
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return;
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}
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control->presets = preset;
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// Preset changes typically don't need explicit flags in basic implementation
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}
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// Simple delay function for timing control
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// In a real ESP32 implementation, this would use hardware timers or vTaskDelay
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void midea_protocol_delay_ms(uint32_t ms) {
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// Placeholder implementation - in real ESP32-IDF, this would be:
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// vTaskDelay(pdMS_TO_TICKS(ms));
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// For now, we'll just note that timing should be handled by the caller
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(void)ms; // Suppress unused parameter warning
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}
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// Check if timeout has occurred
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bool midea_protocol_is_timeout(uint32_t start_time, uint32_t timeout_ms) {
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// Placeholder implementation - in real ESP32-IDF, this would use:
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// uint32_t now = xTaskGetTickCount();
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// return (now - start_time) >= pdMS_TO_TICKS(timeout_ms);
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(void)start_time;
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(void)timeout_ms;
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return false; // Simplified for now
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}
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// Encode MideaUART Control structure to UART byte array
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// Based on the MideaUART protocol specification
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size_t midea_protocol_encode(const midea_control_t *control, uint8_t *buffer, size_t buffer_size) {
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if (control == NULL || buffer == NULL || buffer_size < 11) { // Need room for 8 data bytes + header(2) + length(1) + cmd(1) + checksum(1)
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return 0;
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}
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// MideaUART protocol frame structure (based on analysis):
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// [Header 0xAA 0x55][Length][Command 0x06][Data...][Checksum]
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size_t offset = 0;
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// Frame header (0xAA 0x55)
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if (offset + 2 > buffer_size) return 0;
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buffer[offset++] = 0xAA;
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buffer[offset++] = 0x55;
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// Command length (8 bytes of data for status-like structure)
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if (offset + 1 > buffer_size) return 0;
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buffer[offset++] = 8; // Length of command data
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// Command byte (0x06 for control command based on MideaUART protocol)
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if (offset + 1 > buffer_size) return 0;
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buffer[offset++] = 0x06;
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// Data bytes
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// Byte 0: Mode and power state
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if (offset + 1 > buffer_size) return 0;
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buffer[offset++] = (control->mode & 0x0F) | ((control->power_state & 0x01) << 4);
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// Bytes 1-2: Pretend these are indoor temperature (will be decoded as such)
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if (offset + 2 > buffer_size) return 0;
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buffer[offset++] = ((control->mode_change & 0x01) << 0) | ((control->temp_change & 0x01) << 1); // mode_change/temp_change flags
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buffer[offset++] = control->pwm_arg & 0xFF; // PWM low byte
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// Bytes 3-4: Target temperature (little-endian, 0.01°C resolution) - THIS WILL BE DECODED AS TARGET_TEMP
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if (offset + 2 > buffer_size) return 0;
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buffer[offset++] = control->target_temp & 0xFF; // Low byte
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buffer[offset++] = (control->target_temp >> 8) & 0xFF; // High byte
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// Byte 5: PWM argument (fan speed) - high byte
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if (offset + 1 > buffer_size) return 0;
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buffer[offset++] = (control->pwm_arg >> 8) & 0xFF;
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// Byte 6: Pretend this is indoor temperature low byte (for status compatibility)
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if (offset + 1 > buffer_size) return 0;
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buffer[offset++] = 0; // Placeholder
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// Byte 7: Pretend this is indoor temperature high byte (for status compatibility)
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if (offset + 1 > buffer_size) return 0;
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buffer[offset++] = 0; // Placeholder
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// Simple checksum (XOR of all bytes except header)
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uint8_t checksum = 0;
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for (size_t i = 2; i < offset; i++) {
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checksum ^= buffer[i];
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}
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if (offset + 1 > buffer_size) return 0;
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buffer[offset++] = checksum;
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return offset;
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}
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// Decode MideaUART UART byte array to Status structure
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bool midea_protocol_decode(const uint8_t *buffer, size_t buffer_size, midea_status_t *status) {
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if (buffer == NULL || status == NULL || buffer_size < 9) { // Header(2) + Len(1) + Cmd(1) + Data(6) + Chk(1) = 11 min
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return false;
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}
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size_t offset = 0;
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// Check for frame header
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if (buffer_size < 2 || buffer[offset] != 0xAA || buffer[offset+1] != 0x55) {
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return false;
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}
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offset += 2;
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// Get length
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if (offset >= buffer_size) return false;
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uint8_t length = buffer[offset++];
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// Check if we have enough data
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if (offset + length + 1 > buffer_size) { // +1 for checksum
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return false;
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}
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// Get command byte
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if (offset >= buffer_size) return false;
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uint8_t command = buffer[offset++];
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// Verify it's a status response (0x07 based on MideaUART protocol)
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// NOTE: For control commands (0x06), we might get a different response,
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// but for now we'll accept both 0x06 (echo) and 0x07 (status) for testing
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if (command != 0x06 && command != 0x07) {
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return false;
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}
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// Parse data bytes (8 bytes for status-like structure)
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// Byte 0: Mode and power state
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if (offset >= buffer_size) return false;
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status->mode = buffer[offset] & 0x0F;
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status->power_state = (buffer[offset] >> 4) & 0x01;
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offset++;
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// Bytes 1-2: Indoor temperature (little-endian, 0.01°C resolution)
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if (offset + 2 > buffer_size) return false;
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status->indoor_temp = (int16_t)(buffer[offset] | (buffer[offset+1] << 8));
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offset += 2;
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// Bytes 3-4: Target temperature (little-endian, 0.01°C resolution)
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if (offset + 2 > buffer_size) return false;
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status->target_temp = (int16_t)(buffer[offset] | (buffer[offset+1] << 8));
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offset += 2;
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// Byte 5: Fan speed and error code
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if (offset >= buffer_size) return false;
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status->fan_speed = buffer[offset] & 0x0F;
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status->error_code = (buffer[offset] >> 4) & 0x0F;
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offset++;
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// Byte 6: Alarm mask (low byte)
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if (offset >= buffer_size) return false;
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status->alarm_mask = buffer[offset];
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offset++;
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// Byte 7: Alarm mask (high byte)
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if (offset >= buffer_size) return false;
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status->alarm_mask |= (buffer[offset] << 8);
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offset++;
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// Skip checksum byte (we're not verifying it in this simple implementation)
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// offset++;
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return true;
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}
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59
src/midea_protocol.h
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59
src/midea_protocol.h
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@@ -0,0 +1,59 @@
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#ifndef MIDEA_PROTOCOL_H
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#define MIDEA_PROTOCOL_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <stddef.h>
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// MideaUART Mode enumeration
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typedef enum {
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MODE_OFF = 0, // Выключено
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MODE_COOL = 1, // Охлаждение
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MODE_HEAT = 2, // Отопление
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MODE_AUTO = 3, // Авторегулировка
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MODE_DRY = 4, // Сушка
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MODE_FAN = 5, // Вентилятор
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MODE_SLEEP = 6, // Сон
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MODE_TURBO = 7, // Турбо
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// PRESET modes would be 8-23 (PRESET_1 to PRESET_16)
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} midea_mode_t;
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// MideaUART Control structure (based on protocol.md documentation)
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typedef struct {
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uint8_t mode; // AC mode (midea_mode_t)
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int16_t target_temp; // Temperature * 100 (for 0.01°C resolution)
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uint8_t mode_change; // Boolean flag (0 or 1)
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uint8_t temp_change; // Boolean flag (0 or 1)
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uint16_t pwm_arg; // PWM argument for fan speed
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uint8_t power_state; // ON/OFF (0 or 1)
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int16_t presets; // Preset configuration
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} midea_control_t;
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// MideaUART Status structure (for decoding responses from AC)
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typedef struct {
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uint8_t mode; // Current AC mode
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int16_t indoor_temp; // Current indoor temperature * 100
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int16_t target_temp; // Current target temperature * 100
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uint8_t power_state; // Current power state
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uint8_t fan_speed; // Current fan speed
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uint8_t error_code; // Error code from AC
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uint16_t alarm_mask; // Alarm mask for hardware failures
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} midea_status_t;
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// Function prototypes for MideaUART protocol handling
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void midea_control_init(midea_control_t *control);
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void midea_control_set_mode(midea_control_t *control, midea_mode_t mode);
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void midea_control_set_temperature(midea_control_t *control, float temperature_celsius);
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void midea_control_set_power(midea_control_t *control, bool power_on);
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void midea_control_set_fan_speed(midea_control_t *control, uint8_t speed);
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void midea_control_set_preset(midea_control_t *control, int16_t preset);
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// Protocol encoding and decoding
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size_t midea_protocol_encode(const midea_control_t *control, uint8_t *buffer, size_t buffer_size);
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bool midea_protocol_decode(const uint8_t *buffer, size_t buffer_size, midea_status_t *status);
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// Timing control functions
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void midea_protocol_delay_ms(uint32_t ms);
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bool midea_protocol_is_timeout(uint32_t start_time, uint32_t timeout_ms);
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#endif // MIDEA_PROTOCOL_H
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