ESE 519-LAB 2A

 Muyuan sheng
 Email:shmuyuan@seas.upenn.edu
 Tested on: Legion Y9000 (i7), windows 11    

3.2

• Why is bit-banging impractical on your laptop, despite it having a much faster processor than the RP2040?
  The computer has many other processes running; if the processor is interrupted will have lots of communication errors.
• What are some cases where directly using the GPIO might be a better choice than using the PIO hardware?
  GPIOs are better suited for less complex tasks such as input and output, I2C or SPI data lines, outputting PWM waveforms, etc.
• How do you get data into a PIO state machine?
  Pull instruction takes a data item from the transmit FIFO buffer and places it in the output shift register.
• How do you get data out of a PIO state machine?
  OSR uses the out instruction to shift this data out.
• How do you program a PIO state machine?
  We can create a .pio file using C to set up the PIO state machine.
• In the example, which low-level C SDK function is directly responsible for telling the PIO to set the LED to a new color? How is this function accessed from the main “application” code?
  "pio_sm_put_blocking", Write data to the TX FIFO queue. Block the TX FIFO queue if it is full.
• What role does the pioasm “assembler” play in the example, and how does this interact with CMake?
  To compile assembly code into a human-readable format.

3.3

Please check the ws2812.c and ws2812.h

3.4

Please check 3.4.xlsx

3.5

3.6

Please check 3.6.xlsx

3.7

4 Hello, Blinkenlight!

It will blinken while print Hello World. GIF