I started small project, where I use "db/plugins/clock" XML file(s) from CubeMX to visualize the state of the clock-tree in the running STM32.
Currently I face number of issues. Mybee you can direct me to other resources more suitable than CubeMX files or you can help me to clarify some of the issues below.
I was able to parse clock XML and draw clock-tree using graphviz, however I have a problem with connecting schematic elements with the register file (loaded from device's SVD). Examples are taken from STM32L0.xml.
The Idea is to parse register/fiels names (from anywhere) and connect it with the schematic elements (MUX, DIV, MULT).
What I need is to connect e.g. RTCClkSource MUX with the register containing MUX inputs to be able to decide which input is active. The same holds also for dividers and multipliers and their values. The problem is, that the name e.g. RTCClkSource (and also its refVals) are unique for CubeMX files. E.g. in the Low-Level drivers, the funcion name to get register values is "LL_RCC_GetRTCClockSource". Here Clk->Clock.
Similar confusion arises for many elements. Sometimes names are "very" different (e.g. PLLSource<->MainSource), while some names/references are equal (e.g. SysClkSource) - I observed no general rules - automatic extraction seems to be problematic. So i expect, that schematic description is generated from hand-written code (RTL?).
Is there any option to avoid hand-work when I want to obtain MUX/DIV/MULT register values (REG/Field symbolic names)?
Is there any resource along these CubeMX db files I missed?
Is there any plan to release other peripheral schematic description (e.g. UART, SPI) along the RCC in the future?
There are there are some problems with semantics and consistence:
- Some of the "Input" elements contain refValue, some does not (yes, those may be extracted elsewhere from db files)
<Input from="HSERTCDevisor" signalId="HSE_RTC"/>
<Input from="LSEOSC" refValue="RCC_RTCCLKSOURCE_LSE" signalId="LSE"/>
- what is the semantic of "refEnable" attribute?
- XML contains equal elements, where 1 contains condition and the second does not, thus when condition holds, both elements are valid?
<Element id="I2C1Mult" refEnable="I2C1Enable" refParameter="I2c1ClockSelection" type="multiplexor" x="965" y="571">
<Condition Diagnostic="" Expression="!LPUART1_Exist"/>
<Input from="APB1Prescaler" refValue="RCC_I2C1CLKSOURCE_PCLK1" signalId="PCLK1"/>
<Input from="HSIRCDiv" refValue="RCC_I2C1CLKSOURCE_HSI" signalId="HSI"/>
<Input from="SysCLKOutput" refValue="RCC_I2C1CLKSOURCE_SYSCLK" signalId="SYSCLKOUT"/>
<Output signalId="I2C1CLK" to="I2C1Output"/>
</Element>
<Element id="I2C1Mult" refEnable="I2C1Enable" refParameter="I2c1ClockSelection" type="multiplexor" x="965" y="553">
<Input from="APB1Prescaler" refValue="RCC_I2C1CLKSOURCE_PCLK1" signalId="PCLK1"/>
<Input from="HSIRCDiv" refValue="RCC_I2C1CLKSOURCE_HSI" signalId="HSI"/>
<Input from="SysCLKOutput" refValue="RCC_I2C1CLKSOURCE_SYSCLK" signalId="SYSCLKOUT"/>
<Output signalId="I2C1CLK" to="I2C1Output"/>
</Element>
