i.MX RT Crossover MCUsのトピックRe: SD Card Assert

SD Card Assert

mspenard603 — Wed, 16 Dec 2020 16:45:13 GMT

Hi Gents,

I occasionally get the following error when trying to use an SD card after initializing it:

ASSERT ERROR " index <= 7 ": file ".fsl_clock.h" Line "978" function name "CLOCK_ControlGate"

Which references the following:

static inline void CLOCK_ControlGate(clock_ip_name_t name, clock_gate_value_t value)
{
uint32_t index = ((uint32_t)name) >> 8U;
uint32_t shift = ((uint32_t)name) & 0x1FU;
volatile uint32_t *reg;

assert(index <= 7);

reg = ((volatile uint32_t *)&CCM->CCGR0) + index;
*reg = ((*reg) & ~(3U << shift)) | (((uint32_t)value) << shift);
}

But I'm unsure what error this indicates... ??

Re: SD Card Assert

jeremyzhou — Thu, 17 Dec 2020 03:25:42 GMT

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
I'd like to know more information about the error.
So I was wondering if you can share which version of SDK and EVK board you tested with.
In further, whether you find a way of replicating the error and what the index's value was when trigger the error.
Looking forward to your reply.

Hope it helps.
Have a great day,
TIC

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Re: SD Card Assert

mspenard603 — Thu, 17 Dec 2020 13:09:36 GMT

Hi Jeremy,

Thanks for the reply. SDK is 2.5.1 and this is with our own PCB. It happens rarely, maybe 1 out of 100 boots. I'll update the printf() to output the index value.

Re: SD Card Assert

mspenard603 — Thu, 17 Dec 2020 15:27:58 GMT

Index at failure:

SD Card detected
Card Init
kCLOCK_Pfd0 Freq: 594000000Hz
kCLOCK_Usdhc2Div: 2 +1
ROOT SD_HOST_CLK_FREQ: 198000000Hz
SD BUS CLOCK: 5500000Hz
[SYSTEM ERROR] Mount volume failed:3 0
Retrying mount in 100 ms
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! index: 1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! index: 1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! index: 16777215
ASSERT ERROR " index <= 7 ": file ".fsl_clock.h" Line "981" function name "CLOCK_ControlGate"

Re: SD Card Assert

jeremyzhou — Fri, 18 Dec 2020 03:12:23 GMT

Hi,
Thanks for your reply.
According to your reply, I guess that the issue may be related to the hardware circuit.
I'd like to suggest you try to slow down the SD bus clock, then give it a try again.
Further, I'd like to suggest you use either a logic analyzer or an OSC oscilloscope to visualize the signals during initializing the SD card, it can help us to figure the issue out.
Have a great day,
TIC

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