Demo description

• This example demonstrates the functions of each device on the board, page 1 displays SD Card, Flash Size, Battery Voltage and other parameters, and page 2 shows the music playback interface; In addition, speech recognition is added to this demo.

Hardware connection

• Insert the TF card into the development board
• Connect the development board to the computer

Code analysis

• Driver_Init(): Initializes the resources required by the hardware, driver, and system, and creates a task to cycle through the hardware driver
  • Hardware initialization: Driver_Init() is responsible for initializing multiple hardware modules, such as power management, clock, I2C bus, external I/O, sensors, etc.
  • Task creation: xTaskCreatePinnedToCore() creates a FreeRTOS task Driver_Loop and binds it to Core 0. This means that the Driver_Loop function will be executed in a loop, handling the hardware-related operations. This task will run concurrently with other tasks, contributing to the real-time performance of the hardware driver
  • Modular design: The initialization function disperses the initialization of each hardware into different modules, which is easy to maintain and expand. If there's new hardware that needs to be supported, just add the initialization code here

• Driver_Loop(): This function runs in a loop in a FreeRTOS task, periodically performing the work of each hardware driver. It is the core component of most hardware driver operations
  • Loop execution hardware driver: Call multiple hardware driver functions in a loop within the Driver_Loop() function, such as QMI8658_Loop(), PCF85063_Loop(), BAT_Get_Volts() and PWR_Loop(), these are hardware operations that are performed in real time
    • QMI8658_Loop(): Handles interaction with QMI8658 sensor and reads sensor data
    • PCF85063_Loop(): Handles PCF85063 clock module and updates the time
    • BAT_Get_Volts(): Gets the current battery voltage to ensure that the device battery level meets the requirements
    • PWR_Loop(): Performs power management tasks, monitors power supply status, and controls power on or off
  • Scheduled task: Using vTaskDelay(pdMS_TO_TICKS(100)), the Driver_Loop() function delays once every 100 milliseconds. This helps ensure that the task does not consume excessive CPU resources and avoids too frequent operations on hardware
  • Delete task: vTaskDelete(NULL) is used to delete the current task, but since while(1) is an infinite loop, the actual line of code will never be executed

Result demonstration

• LCD screen display parameter description

• Page 2 is the UI page for playing mp3 audio in the root directory of the TF card
• This program enables speech recognition by default, the wake-up word is "hi esp", after waking up, you can speak the command after the backlight is dimmed (if the backlight is not dimmed, it means that it has not been woken up, the recognition requirements are strict, the pronunciation needs to be standard, and the speech speed is slowed down)
• The following are available in several formats of MIC test audio (Please note that every time the hi esp wake-up fails, please reset the audio to the playback location of the wake-up word and replay it)
• Please do not perform speech recognition when using the speaker to play audio
• The reason the wake-up word plays twice in the test audio is due to the current firmware version's initial wake-up requiring the device to be focused (an analogy), and the current firmware does not permit the disabling of this function

// Commands
Turn on the backlight
Turn off the backlight
Backlight is brightest
Backlight is darkest