本帖最后由 jjl3 于 2018-8-22 21:56 编辑
大家好！
我做了一块STM32F427IIG的板子，上面有一块ISSI SDRAM IS42S32160F, SDRAM接的是FMC_SDNE1和FMC_SDCKE1引脚. 自己写了一个简单的SDRAM读写程序，但只要读SDRAM中的内容就进入到BusFault_handler中断里面去，查了一下说MPU要配置一下才行，我已经把MPU disable掉怎么还是进入 到BusFault_handler中断里面去? 请大家帮我看看，谢谢！
#include "stm32f4xx_conf.h"
#define SDRAM_BASE_ADDR ((uint8_t *)(0xD0000000))
/************************* PLL Parameters *************************************/
/* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL_M) * PLL_N */
#define PLL_M 25
/* USB OTG FS, SDIO and RNG Clock = PLL_VCO / PLLQ */
#define PLL_Q 7
#define PLL_N 360
/* SYSCLK = PLL_VCO / PLL_P */
#define PLL_P 2
static void SetSysClock(void)
{
/******************************************************************************/
/* PLL (clocked by HSE) used as System clock source */
/******************************************************************************/
__IO uint32_t StartUpCounter = 0, HSEStatus = 0;
/* Enable HSE */
RCC->CR |= ((uint32_t)RCC_CR_HSEON);
/* Wait till HSE is ready and if Time out is reached exit */
do
{
HSEStatus = RCC->CR & RCC_CR_HSERDY;
StartUpCounter++;
} while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
if ((RCC->CR & RCC_CR_HSERDY) != RESET)
{
HSEStatus = (uint32_t)0x01;
}
else
{
HSEStatus = (uint32_t)0x00;
}
if (HSEStatus == (uint32_t)0x01)
{
/* Select regulator voltage output Scale 1 mode */
RCC->APB1ENR |= RCC_APB1ENR_PWREN;
PWR->CR |= PWR_CR_VOS;
/* HCLK = SYSCLK / 1*/
RCC->CFGR |= RCC_CFGR_HPRE_DIV1;
/* PCLK2 = HCLK / 2*/
RCC->CFGR |= RCC_CFGR_PPRE2_DIV2;
/* PCLK1 = HCLK / 4*/
RCC->CFGR |= RCC_CFGR_PPRE1_DIV4;
/* Configure the main PLL */
RCC->PLLCFGR = PLL_M | (PLL_N << 6) | (((PLL_P >> 1) -1) << 16) |
(RCC_PLLCFGR_PLLSRC_HSE) | (PLL_Q << 24);
/* Enable the main PLL */
RCC->CR |= RCC_CR_PLLON;
/* Wait till the main PLL is ready */
while((RCC->CR & RCC_CR_PLLRDY) == 0)
{
}
/* Enable the Over-drive to extend the clock frequency to 180 Mhz */
PWR->CR |= PWR_CR_ODEN;
while((PWR->CSR & PWR_CSR_ODRDY) == 0)
{
}
PWR->CR |= PWR_CR_ODSWEN;
while((PWR->CSR & PWR_CSR_ODSWRDY) == 0)
{
}
/* Configure Flash prefetch, Instruction cache, Data cache and wait state */
FLASH->ACR = FLASH_ACR_PRFTEN | FLASH_ACR_ICEN |FLASH_ACR_DCEN |FLASH_ACR_LATENCY_5WS;
/* Select the main PLL as system clock source */
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
RCC->CFGR |= RCC_CFGR_SW_PLL;
/* Wait till the main PLL is used as system clock source */
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS ) != RCC_CFGR_SWS_PLL);
{
}
}
else
{ /* If HSE fails to start-up, the application will have wrong clock
configuration. User can add here some code to deal with this error */
}
}
void SystemInit(void)
{
/* Reset the RCC clock configuration to the default reset state ------------*/
/* Set HSION bit */
RCC->CR |= (uint32_t)0x00000001;
/* Reset CFGR register */
RCC->CFGR = 0x00000000;
/* Reset HSEON, CSSON and PLLON bits */
RCC->CR &= (uint32_t)0xFEF6FFFF;
/* Reset PLLCFGR register */
RCC->PLLCFGR = 0x24003010;
/* Reset HSEBYP bit */
RCC->CR &= (uint32_t)0xFFFBFFFF;
/* Disable all interrupts */
RCC->CIR = 0x00000000;
/* Configure the System clock source, PLL Multiplier and Divider factors,
AHB/APBx prescalers and Flash settings ----------------------------------*/
SetSysClock();
}
void Clock_Init(void)
{
/* Enable GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, GPIOF, GPIOG, GPIOH, GPIOI, GPIOK and GPIOJ interface clock */
/* Enable Ethernet Reception clock and Ethernet Transmission clock*/
RCC->AHB1ENR |= 0x0E0007FF;
/* Enable the FMC interface clock */
RCC->AHB3ENR |= 0x00000001;
}
void SystemInit_ExtMemCtl(void)
{
register uint32_t tmpreg = 0, timeout = 0xFFFF;
register uint32_t index;
/*-- FMC Configuration ------------------------------------------------------*/
/* Configure and enable SDRAM bank2 */
FMC_Bank5_6->SDCR[1] = 0x000029E9; // 9-bit column addr; 13-bit raw addr
FMC_Bank5_6->SDTR[1] = 0x01112551;
/* SDRAM initialization sequence */
/* Clock enable command */
FMC_Bank5_6->SDCMR = 0x00000009;
tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
while((tmpreg != 0) & (timeout-- > 0))
{
tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
}
/* Delay */
for (index = 0; index<10000; index++);
/* PALL command */
FMC_Bank5_6->SDCMR = 0x0000000A;
timeout = 0xFFFF;
while((tmpreg != 0) & (timeout-- > 0))
{
tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
}
/* Auto refresh command */
FMC_Bank5_6->SDCMR = 0x000000AB;
timeout = 0xFFFF;
while((tmpreg != 0) & (timeout-- > 0))
{
tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
}
/* MRD register program */
FMC_Bank5_6->SDCMR = 0x0000660C;
timeout = 0xFFFF;
while((tmpreg != 0) & (timeout-- > 0))
{
tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
}
/* Set refresh count */
tmpreg = FMC_Bank5_6->SDRTR;
FMC_Bank5_6->SDRTR = 0x00000381;
/* Disable write protection */
tmpreg = FMC_Bank5_6->SDCR[1];
FMC_Bank5_6->SDCR[1] = (tmpreg & 0xFFFFFDFF);
}
void GPIO_Init1(void)
{
/* Connect PCx pins to FMC Alternate function */
GPIOC->AFR[0] = 0x0000000C;
// GPIOC->AFR[1] = 0x00007700;
/* Configure PCx pins in Alternate function mode */
GPIOC->MODER = 0x50000002;
/* Configure PCx pins speed to 50 MHz */
GPIOC->OSPEEDR = 0x00000002;
/* Configure PCx pins Output type to push-pull */
GPIOC->OTYPER = 0x00000000;
/* No pull-up, No pull-down for PCx pins */
GPIOC->PUPDR = 0x00000000;
/* Connect PDx pins to FMC Alternate function */
GPIOD->AFR[0] = 0x000000CC;
GPIOD->AFR[1] = 0xCC000CCC;
/* Configure PDx pins in Alternate function mode */
GPIOD->MODER = 0xA02A000A;
/* Configure PDx pins speed to 50 MHz */
GPIOD->OSPEEDR = 0xA02A000A;
/* Configure PDx pins Output type to push-pull */
GPIOD->OTYPER = 0x00000000;
/* No pull-up, pull-down for PDx pins */
GPIOD->PUPDR = 0x00000000;
/* Connect PEx pins to FMC Alternate function */
GPIOE->AFR[0] = 0xC00000CC;
GPIOE->AFR[1] = 0xCCCCCCCC;
/* Configure PEx pins in Alternate function mode */
GPIOE->MODER = 0xAAAA800A;
/* Configure PEx pins speed to 50 MHz */
GPIOE->OSPEEDR = 0xAAAA800A;
/* Configure PEx pins Output type to push-pull */
GPIOE->OTYPER = 0x00000000;
/* No pull-up, pull-down for PEx pins */
GPIOE->PUPDR = 0x00000000;
/* Connect PFx pins to FMC Alternate function */
GPIOF->AFR[0] = 0x00CCCCCC;
GPIOF->AFR[1] = 0xCCCCC000;
/* Configure PFx pins in Alternate function mode */
GPIOF->MODER = 0xAA800AAA;
/* Configure PFx pins speed to 50 MHz */
GPIOF->OSPEEDR = 0xAA800AAA;
/* Configure PFx pins Output type to push-pull */
GPIOF->OTYPER = 0x00000000;
/* No pull-up, pull-down for PFx pins */
GPIOF->PUPDR = 0x00000000;
/* Connect PGx pins to FMC Alternate function */
GPIOG->AFR[0] = 0x00CC0CCC;
GPIOG->AFR[1] = 0xC000000C;
/* Configure PGx pins in Alternate function mode */
GPIOG->MODER = 0x80020A2A;
/* Configure PGx pins speed to 50 MHz */
GPIOG->OSPEEDR = 0x80020A2A;
/* Configure PGx pins Output type to push-pull */
GPIOG->OTYPER = 0x00000000;
/* No pull-up, pull-down for PGx pins */
GPIOG->PUPDR = 0x00000000;
/* Connect PHx pins to FMC Alternate function */
GPIOH->AFR[0] = 0xCC000000;
GPIOH->AFR[1] = 0xCCCCCCCC;
/* Configure PHx pins in Alternate function mode */
GPIOH->MODER = 0xAAAAA000;
/* Configure PHx pins speed to 50 MHz */
GPIOH->OSPEEDR = 0xAAAAA000;
/* Configure PHx pins Output type to push-pull */
GPIOH->OTYPER = 0x00000000;
/* No pull-up, pull-down for PHx pins */
GPIOH->PUPDR = 0x00000000;
/* Connect PIx pins to FMC Alternate function */
GPIOI->AFR[0] = 0xCCCCCCCC;
GPIOI->AFR[1] = 0x00000CC0;
/* Configure PIx pins in Alternate function mode */
GPIOI->MODER = 0x0028AAAA;
/* Configure PIx pins speed to 50 MHz */
GPIOI->OSPEEDR = 0x0028AAAA;
/* Configure PIx pins Output type to push-pull */
GPIOI->OTYPER = 0x00000000;
/* No pull-up, pull-down for PIx pins */
GPIOI->PUPDR = 0x00000000;
}
int main()
{
uint32_t tmpreg;
uint8_t *addr, i, temp;
SystemInit();
Clock_Init();
GPIO_Init1();
SystemInit_ExtMemCtl();
MPU->CTRL = 0x00000000; //disable MPU
GPIOC->ODR = 0x00008000; //GPIO点个灯
addr = SDRAM_BASE_ADDR;
*addr = 0xAA; // 单步能执行到这步
temp = *addr; // 只要执行到这句就进入到busfault中断里去出不来了
while(1)
{
for(tmpreg = 0; tmpreg < 8000000; tmpreg++);
if(temp == 0xAA)
GPIOC->ODR = GPIOC->ODR ^ 0x0000C000;
else
GPIOC->ODR = GPIOC->ODR ^ 0x00004000;
};
} |
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