LPC MicrocontrollersのトピックCMSIS FCLKSEL10 LPC54018

CMSIS FCLKSEL10 LPC54018

danielgull — Thu, 26 Mar 2020 06:13:34 GMT

In the SDK 2.7.0 for LPC54018 I have found this SYSCON_Type struct rather odd. The SPI10 with its FCLKSEL is defined separately from other SPI interface FCLKSEL. What is the reason? Can this be changed in the next SDK?

SDK_2.7.0_LPCXpresso54018\devices\LPC54018\LPC54018.h

Status Quo

typedef struct {
....
__IO uint32_t FCLKSEL[10];
__IO uint32_t FCLKSEL10;
....
} SYSCON_Type;

Proposal for change

typedef struct {
....
__IO uint32_t FCLKSEL[11];
....
} SYSCON_Type;

Many thanks

Dani

Re: CMSIS FCLKSEL10 LPC54018

xiangjun_rong — Thu, 26 Mar 2020 09:52:44 GMT

Hi, Daniel,

Thank you for your pointing out the drawback of the SYSCON_Type structure. As you know that the UM11060.pdf defines two Table:

Table 121. Flexcomm Interface clock source select registers (FCLKSEL0-9, main syscon: offsets 0x2B0 through
2D4) bit description

Table 122. Flexcomm Interface clock source select registers (FCLKSEL10, main syscon: offset 2D8) bit description

Obviously, the address of FCLKSEL0-9 and FCLKSEL10 are continuous, but the engineers do not compute the address, so they define the FCLKSEL10 independently as the UM. But It does not take effect on the function and performance of the code.

Anyway, I will tell the firmware team of the question.

XiangJun Rong

Re: CMSIS FCLKSEL10 LPC54018

danielgull — Thu, 26 Mar 2020 10:54:30 GMT

Hi XiangJun

Good point - that explains whay this register has a different name. I think it is best to keep the situation as is, because otherwise you could end up by setting the register the same as the others which will end up in a wrong configuration. The registers are not the same!

Suggestion:

Don't change anything and keep things the way they are.

Thank you for your valuable input and making me aware of this.

Dani