基于MCUXpresso的RT1024 FlexRAM重新配置后的debug错误

小恩GG · 发表于 2021-4-16 11:27:51

问题背景

在论坛中，已经有几篇介绍FlexRAM重新配置的经验分享了，如基于IAR RT1064 FlexRAM重新配置、基于MCUXpresso RT1050 FlexRAM重新配置、基于MCUXpresso RT1020 FlexRAM重新配置等，本篇经验分享是由于客户想实现将RT1024中的FlexRAM全部都配置成256 KB的OCRAM，即DTCM与ITCM都为0 KB，客户按照基于MCUXpresso RT1020 FlexRAM重新配置的经验分享来重新配置FlexRAM，并且修改Debug脚本以实现debug功能，但客户在所有的配置和修改完成后，依然无法进入debug?(如图一所示)

图一：Debug错误

问题分析

根据图一的错误信息，我们猜测问题应该与RT1064 flexRAM ITCM为0 IAR debug问题解决里碰到的问题类似，MCUXpresso IDE内的Flash driver需要占用DTCM区域（0x20000000~0x2003FFFF)，但是ITCM和DTCM在代码工程中ResetISR中断函数中已经被禁止了，具体代码如下。

void ResetISR(void) {
// Disable interrupts
__asm volatile ("cpsid i");
FLEXRAM->TCM_CTRL = 4;
IOMUXC_GPR->GPR17 = 0x00005555; //FlexRAM全部配置层OCRAM
IOMUXC_GPR->GPR16 |= 0x4;
IOMUXC_GPR->GPR16 &= ~(0x3); //禁用ITCM，DTCM
IOMUXC_GPR->GPR14 = ((0<<20) | (0<<16)) ;
__asm volatile ("MSR MSP, %0" : : "r" (&_vStackTop) : );
~~~~~~~
~~~~~~~
~~~~~~~
}

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问题解决

针对这类问题，需要我们修改Flash driver，以避开必须占用DTCM区域的限制，而如何生成满足需要的flash driver呢？
在痞子衡嵌入式：恩智浦i.MX RT1xxx系列MCU硬件那些事（2.6）- 串行NOR Flash下载算法(MCUXpresso IDE篇)中介绍了MCUXpresso IDE的NOR Flash下载算法设计步骤，我们就遵照上述文档介绍的步骤来修改RT1024的Flash driver。
由于在~\MCUXpressoIDE_11.3.0\ide\Examples\Flashdrivers\NXP\iMXRT路径下的Flash driver源码没有RT1024的Flash driver源码，所有我们选择iMXRT1020_QSPI工程作为原型工程。

图二 iMXRT1020_QSPI工程

RT1024相较于RT1020最大的不同就是，QSPI flash集成在RT1024的封装里面，对外就与内置的Flash一样。
其中对应的FlexSPI模块的连接线如下图所示，所以我们除了需要MemoryDevice连接到OCRAM区域执行外，还需要修改FlexSPI模块引脚的初始化以与图三相符，具体过程如下：

图三 FlexSPI模块连接线

修改iMXRT1020_QSPI工程的FlashDriver_32Kbuffer.ld链接文件，具体如下

/*
* Linker script for NXP LPC546xx SPIFI Flash Driver (Messaged)
*/
MEMORY
{
/*SRAM (rwx) : ORIGIN = 0x20000000, LENGTH = (64 * 1024)*/
SRAM (rwx) : ORIGIN = 0x20200000, LENGTH = (64 * 1024) /*OCRAM的前64KB区域/*
}
/* stack size : multiple of 8*/
__stack_size = (4 * 1024);
/* flash image buffer size : multiple of page size*/
__cache_size = (32 * 1024);
~~~~~~~~~~
~~~~~~~~~~
}

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修改iMXRT1020_QSPI工程中的pin_mux.c文件内的BOARD_InitPins函数，代码如下：

/* FUNCTION ************************************************************************************************************
*
* Function Name : BOARD_InitPins
* Description : Configures pin routing and optionally pin electrical features.
*
* END ****************************************************************************************************************/
void BOARD_InitPins(void) {
CLOCK_EnableClock(kCLOCK_Iomuxc); /* iomuxc clock (iomuxc_clk_enable): 0x03u */
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B0_06_LPUART1_TX, /* GPIO_AD_B0_06 is configured as LPUART1_TX */
0U); /* Software Input On Field: Input Path is determined by functionality */
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B0_07_LPUART1_RX, /* GPIO_AD_B0_07 is configured as LPUART1_RX */
0U); /* Software Input On Field: Input Path is determined by functionality */
IOMUXC_SetPinMux(
IOMUXC_GPIO_SD_B1_05_FLEXSPI_A_DQS, /* GPIO_SD_B1_05 is configured as FLEXSPI_A_DQS */
1U); /* Software Input On Field: Force input path of pad GPIO_SD_B1_05 */
// IOMUXC_SetPinMux(
// IOMUXC_GPIO_SD_B1_06_FLEXSPI_A_DATA03, /* GPIO_SD_B1_06 is configured as FLEXSPI_A_DATA03 */
// 1U); /* Software Input On Field: Force input path of pad GPIO_SD_B1_06 */
// IOMUXC_SetPinMux(
// IOMUXC_GPIO_SD_B1_07_FLEXSPI_A_SCLK, /* GPIO_SD_B1_07 is configured as FLEXSPI_A_SCLK */
// 1U); /* Software Input On Field: Force input path of pad GPIO_SD_B1_07 */
// IOMUXC_SetPinMux(
// IOMUXC_GPIO_SD_B1_08_FLEXSPI_A_DATA00, /* GPIO_SD_B1_08 is configured as FLEXSPI_A_DATA00 */
// 1U); /* Software Input On Field: Force input path of pad GPIO_SD_B1_08 */
// IOMUXC_SetPinMux(
// IOMUXC_GPIO_SD_B1_09_FLEXSPI_A_DATA02, /* GPIO_SD_B1_09 is configured as FLEXSPI_A_DATA02 */
// 1U); /* Software Input On Field: Force input path of pad GPIO_SD_B1_09 */
// IOMUXC_SetPinMux(
// IOMUXC_GPIO_SD_B1_10_FLEXSPI_A_DATA01, /* GPIO_SD_B1_10 is configured as FLEXSPI_A_DATA01 */
// 1U); /* Software Input On Field: Force input path of pad GPIO_SD_B1_10 */
// IOMUXC_SetPinMux(
// IOMUXC_GPIO_SD_B1_11_FLEXSPI_A_SS0_B, /* GPIO_SD_B1_11 is configured as FLEXSPI_A_SS0_B */
// 1U); /* Software Input On Field: Force input path of pad GPIO_SD_B1_11 */
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B1_00_FLEXSPI_A_DATA03, /* GPIO_AD_B1_00 is configured as FLEXSPI_A_DATA03 */
1U); /* Software Input On Field: Force input path of pad GPIO_AD_B1_00 */
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B1_01_FLEXSPI_A_SCLK, /* GPIO_AD_B1_01 is configured as FLEXSPI_A_SCLK */
1U); /* Software Input On Field: Force input path of pad GPIO_AD_B1_01 */
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B1_02_FLEXSPI_A_DATA00, /* GPIO_AD_B1_02 is configured as FLEXSPI_A_DATA00 */
1U); /* Software Input On Field: Force input path of pad GPIO_AD_B1_02 */
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B1_03_FLEXSPI_A_DATA02, /* GPIO_AD_B1_03 is configured as FLEXSPI_A_DATA02 */
1U); /* Software Input On Field: Force input path of pad GPIO_AD_B1_03 */
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B1_04_FLEXSPI_A_DATA01, /* GPIO_AD_B1_04 is configured as FLEXSPI_A_DATA01 */
1U); /* Software Input On Field: Force input path of pad GPIO_AD_B1_04 */
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B1_05_FLEXSPI_A_SS0_B, /* GPIO_AD_B1_05 is configured as FLEXSPI_A_SS0_B */
1U); /* Software Input On Field: Force input path of pad GPIO_AD_B1_05 */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_AD_B0_06_LPUART1_TX, /* GPIO_AD_B0_06 PAD functional properties : */
0x10B0u); /* Slew Rate Field: Slow Slew Rate
Drive Strength Field: R0/6
Speed Field: medium(100MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_AD_B0_07_LPUART1_RX, /* GPIO_AD_B0_07 PAD functional properties : */
0x10B0u); /* Slew Rate Field: Slow Slew Rate
Drive Strength Field: R0/6
Speed Field: medium(100MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_SD_B1_05_FLEXSPI_A_DQS, /* GPIO_SD_B1_05 PAD functional properties : */
0x10F1u); /* Slew Rate Field: Fast Slew Rate
Drive Strength Field: R0/6
Speed Field: max(200MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_SD_B1_06_FLEXSPI_A_DATA03, /* GPIO_SD_B1_06 PAD functional properties : */
0x10F1u); /* Slew Rate Field: Fast Slew Rate
Drive Strength Field: R0/6
Speed Field: max(200MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_SD_B1_07_FLEXSPI_A_SCLK, /* GPIO_SD_B1_07 PAD functional properties : */
0x10F1u); /* Slew Rate Field: Fast Slew Rate
Drive Strength Field: R0/6
Speed Field: max(200MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_SD_B1_08_FLEXSPI_A_DATA00, /* GPIO_SD_B1_08 PAD functional properties : */
0x10F1u); /* Slew Rate Field: Fast Slew Rate
Drive Strength Field: R0/6
Speed Field: max(200MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_SD_B1_09_FLEXSPI_A_DATA02, /* GPIO_SD_B1_09 PAD functional properties : */
0x10F1u); /* Slew Rate Field: Fast Slew Rate
Drive Strength Field: R0/6
Speed Field: max(200MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_SD_B1_10_FLEXSPI_A_DATA01, /* GPIO_SD_B1_10 PAD functional properties : */
0x10F1u); /* Slew Rate Field: Fast Slew Rate
Drive Strength Field: R0/6
Speed Field: max(200MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_SD_B1_11_FLEXSPI_A_SS0_B, /* GPIO_SD_B1_11 PAD functional properties : */
0x10F1u); /* Slew Rate Field: Fast Slew Rate
Drive Strength Field: R0/6
Speed Field: max(200MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
}