topic Re: RT1061 LPSPI写TCR中的CONT和CPNTC位不生效 in i.MX RT Crossover MCUs

RT1061 LPSPI写TCR中的CONT和CPNTC位不生效

TheSix — Mon, 13 May 2024 08:33:34 GMT

下面这张图是我在函数中设置CONT和CONTC位为0：

从串口输出界面可以看出，函数的设置并未生效。但是是我在另外的函数进行相同的设置却是可以生效的，这是为什么呢？如下图：

下面是我的未生效的函数代码的实现：

status_t FRAM_read(uint32_t address, uint32_t* buffer, uint32_t size)

{

status_t status = kStatus_Success;

uint32_t addr_low = address & 0xff;

uint32_t addr_high = address >> 8;

uint32_t transfer_size = size;

uint32_t* transfer_buffer = buffer;

/* Check that LPSPI is not busy. */

if((LPSPI_GetStatusFlags(LPSPI1) & (uint32_t)kLPSPI_ModuleBusyFlag) != 0U)

{

return kStatus_LPSPI_Busy;

}

/* flush fifo. clear status flag. */

LPSPI_FlushFifo(LPSPI1, true, true);

LPSPI_ClearStatusFlags(LPSPI1, (uint32_t)kLPSPI_AllStatusFlag);

PRINTF("1 SR:%x, TCR:%x\r\n", LPSPI1->SR, LPSPI1->TCR);

/* start transfer.PCS is assered and RXMASK is de-assered. */

LPSPI1->TCR |= LPSPI_TCR_CONT(true)|LPSPI_TCR_CONTC(true)|LPSPI_TCR_RXMSK(true);

/*TCR is also shared the FIFO, so wait for TCR written.*/

if (!LPSPI_WaitTxFifoEmpty(LPSPI1))

{

return kStatus_LPSPI_Timeout;

}

PRINTF("2 SR:%x, TCR:%x\r\n", LPSPI1->SR, LPSPI1->TCR);

/* send read opcode and RXMASK is de-assered to start recieve data. */

LPSPI_WriteData(LPSPI1, READ_OPCODE);

LPSPI_WriteData(LPSPI1, addr_high);

LPSPI_WriteData(LPSPI1, addr_low);

LPSPI1->TCR &= (uint32_t)~LPSPI_TCR_RXMSK_MASK;

if (!LPSPI_WaitTxFifoEmpty(LPSPI1))

{

return kStatus_LPSPI_Timeout;

}

PRINTF("3 SR:%x, TCR:%x\r\n", LPSPI1->SR, LPSPI1->TCR);

while(transfer_size > 0)

{

LPSPI_WriteData(LPSPI1, (uint32_t)0);

if((LPSPI_GetStatusFlags(LPSPI1) & (uint32_t)kLPSPI_RxDataReadyFlag) != 0U)

{

*transfer_buffer = LPSPI_ReadData(LPSPI1);

//PRINTF("recieve data %d:%x\r\n", (size-transfer_size), *transfer_buffer);

transfer_size--;

transfer_buffer++;

}

LPSPI1->TCR &= ~(LPSPI_TCR_CONTC_MASK | LPSPI_TCR_CONT_MASK);

if (!LPSPI_WaitTxFifoEmpty(LPSPI1))

{

return kStatus_LPSPI_Timeout;

}

PRINTF("4 SR:%x, TCR:%x\r\n", LPSPI1->SR, LPSPI1->TCR);

return status;

}

回复： RT1061 LPSPI写TCR中的CONT和CPNTC位不生效

Gavin_Jia — Tue, 14 May 2024 08:33:36 GMT

Hi @TheSix ，

从这个输出来看确实很奇怪。可以尝试加一个打印在if语句之前吗？应该置位是成功的，如果这样是不是说明在等待TxFifo发送的时候又被其他函数改变了？

Best regards,
Gavin

回复： RT1061 LPSPI写TCR中的CONT和CPNTC位不生效

TheSix — Wed, 15 May 2024 03:58:46 GMT

在if之前打印TCR的值也是同样的结果，写TCR寄存器的值并未生效。而且在代码中并没有在其他的地方再修改这个TCR的值。这个问题太奇怪了。

回复： RT1061 LPSPI写TCR中的CONT和CPNTC位不生效

Gavin_Jia — Wed, 15 May 2024 08:14:09 GMT

尝试一下先禁用中断再修改寄存器呢？等处理逻辑结束之后再使能中断。

Re: RT1061 LPSPI写TCR中的CONT和CPNTC位不生效

davenadler — Wed, 15 May 2024 14:32:51 GMT

I don't read Chinese but this might help:
https://community.nxp.com/t5/i-MX-RT/LPSPI-bugs-around-TCR-More-FSL-library-bugs-plus-an-LPSPI/td-p/1864507

回复： RT1061 LPSPI写TCR中的CONT和CPNTC位不生效

TheSix — Thu, 16 May 2024 05:53:50 GMT

我的程序中并没有开启任何中断，并且仅仅只使用了LPSPI这一个外设。尽管如此，我还是去尝试禁用了中断，但是仍然结果仍然是一样的。

Re: RT1061 LPSPI写TCR中的CONT和CPNTC位不生效

TheSix — Thu, 16 May 2024 06:08:11 GMT

Thank you, this is very inspiring to me.

Re: RT1061 LPSPI写TCR中的CONT和CPNTC位不生效

davenadler — Thu, 16 May 2024 13:51:01 GMT

Glad to help, Don't forget to click "Kudos" on my posts!

It would be great if NXP would fix the FSL drivers - this is apparently a known problem (but not documented in errata nor fixed in FSL).

Best Regards, Dave