FAQ for Peripherals

• I/O
  • FAQ for I/O
    • 1. How to deal with the problem of high sleep power consumption due to IO leakage (how to properly configure and detect IOs before sleep)?
    • 2. How to deal with IO interrupt loss?
    • 3. Does IO have push-pull output mode?
    • 4. What is the reason for the large frequency error when outputting a square wave using IO flip-flop?
• ADC
  • FQA for ADC
    • 1. Calling the asynchronous acquisition interface keeps failing to generate a completion interrupt
    • 2. Some of the internal reference voltage stalls are captured with large errors in the results
    • 3. High sampling rate with large error in the result.
    • 4. Slow Asynchronous Acquisition Interface
    • 5. Synchronous capture interface fails to generate data
• DMA
  • FAQ for DMA
    • 1. DMA transfers use the concept of beat, what is a beat?
    • 2. Can the same DMA channel of the same DMA instance be configured for use by different peripherals at the same time?
• I2C
  • FAQ for I2C
    • 1. During I2C transmission, the SDA is abnormal and is forced down all the time by the slave and cannot be recovered, what is the reason?
    • 2. During I2C transfer, SCL is abnormal and stuck at low level.
• I2S
• QSPI
  • FAQ for QSPI
    • 1. What is the maximum frequency supported by QSPI?
    • 2. QSPI Operation Mode Introduction
    • 3. What is the reason for data end-sequence exception when using Memory Map mode to access external Flash?
    • 4. Using traditional API interface (non-Memory Map mode) to read external Flash, the data does not match the desired data endian order.
    • 5. How to support QSPI module to use Memory Map mode to access Flash larger than 16 MB 4-byte address?
    • 6. Accessing Flash using the QSPI sample project from the SDK fails, why?
    • 7. What are the reference programs for the QSPI peripheral?
• SPI
  • FAQ for SPI
    • 1. What is the maximum frequency supported by SPI?
    • 2. What is software chip select, what is hardware chip select, and what is the difference in usage?
    • 3. A callback error event APP_SPI_EVT_ERROR occurs when SPI receives data, how should I handle it?
• Timer
  • FAQ for GPTimer
    • 1. What is the difference between app_tim.c and app_timer.c? Which timers are low power timers? Which ones are not?
    • 2. Using Timer/Dual Timer timing, test the timing accuracy by flipping the IO in interrupt, and found the error is relatively large, what is the reason?
    • 3. Using Timer/Dual Timer timing, test the timing accuracy by flipping the IO in the interrupt, and found that the error of the first cycle is very large, and the later cycles meet the requirement, what is the reason?
  • FAQ for RTC
    • 1. What are the reasons for the large RTC timing errors?
    • 2. How to get the system runtime according to RTC?
    • 3. The RTC does not work, or call app_rtc_get_time(&time) and find that the time obtained remains the same, what is the reason?
  • FAQ for WDT
    • 1. What are the reasons why the watchdog does not work (or does not feed the dog for a predetermined period of time, but does not generate a reset)?
    • 2. The watchdog reset time is not correct, what is the reason?
• UART
  • FAQ for UART
    • 1. GR5xx chip serial port no data output, print garbage, data reception abnormal, what may be the reason?
    • 2. GR5xx chip serial port easily trigger APP_UART_EVT_ERROR interrupt, what is the reason?
    • 3. How to configure GR5xx chip serial module?
• USB
• X-QSPI