Functions

General information:

• r0 and r1 are outputs
• r0 .. r3 are arguments
• r4 .. r12 are preserved

Status: Completed

GPIO

gpio_blink:

• Blink a pin for a given duration
• Inputs:
  • r0 is the pin number
  • r1 is the duration in microseconds
• Outputs: none
• Registers not conserved: r0, r1, r2, r3

gpio_output:

• Toggle a pin's output
• Inputs:
  • r0 is the pin number
  • r1 is the state (1:set, 0:clr)
• Outputs: none
• Registers not conserved: r0, r1, r2

gpio_set_function:

• Select function for a GPIO pin
• Inputs:
  • r0 is the pin number
  • r1 is the function (either GPIO_IN or GPIO_OUT)
• Outputs: none
• Registers not conserved: r0, r1, r2, r3

System Timer

st_sleep:

• Wait for r0 microseconds
• Inputs:
  • r0 is the number of microseconds to sleep
• Registers not conserved: r0, r1, r2

st_get_timestamp:

• Get the current timestamp (from ST_CS) and put it in r0 and r1
• Inputs: none
• Outputs: timestamp in r0 and r1
• Registers not conserved: r0, r1

Status: Planned