Change Note 2024-05-17

New Modules SPIdev

• Defines the SPI device as implemented in the RP2040.
• Initialise the data structures.
• Configure and enable the hardware.
• See example program SPIrtc.

New Module SPIdata

• Make use of the SPI device as per SPIdev to transmit and receive data to SPI peripherals.
• Master mode, 8 bits data size, MSB first for now.
• Busy waiting (blocking), FIFO-buffered.
• See example program SPIrtc.

Module GPIO

• Procedure ConfigPad allows to change only specific configuration settings.
• Export the fields of PadConfig (defect fixed, pretty useless without).

Module MCU2

• Correct identifiers SPIO0_Base to SPI0_Base, and SPIO1_Base to SPI1_Base, respectively.
• Clean up the assembly instruction CONSTs naming and comments.
• New assembly instruction CONSTs to use r3 as target for moves from special regs.

Modules Kernel (v1 and v2)

• Use updated assembly instruction CONSTs in module MCU2.

Module UARTd is now UARTdev

• Rename module UARTd to UARTdev.
• Update framework modules accordingly
  • Terminals.mod
  • UARTstr.mod, UARTkstr.mod

Module LEDext

• Add four LEDs for a total of eight, useful for debugging under timing constraints where diagnostic messages are impossible.
• Change the GPIO pins accordingly.
• Add a procedure SetValue to display an 8 bit value.

New Example Program SPIrtc

• Explain and test the added SPI functionality using a Maxim DS3242 real-time clock peripheral.
• SPIrtc

Example Program TrapHandlers

• Use r3 to read trap parameters from stack (before: r11).