我正在使用 MCF51EM256 Freescale 微 Controller ,但在删除外部闪存 (0x20000 - 0x2FFFF) 时遇到一些问题。
这是我的主程序:
void main(void) {
EnableInterrupts;
FlashInit();
DisableInterrupts;
EraseFlash(0x020000);
EraseFlash(0x020800);
EraseFlash(0x020C00);
EnableInterrupts;
for(;;) {
__RESET_WATCHDOG(); /* feeds the dog */
SetLED(2, 2); // Toggle led if the program is running
} /* loop forever */
/* please make sure that you never leave main */
}
其中“EraseFlash()”:
void EraseFlash(long addr){
// The flash sector to erase is always 1 kB
long eraseValue = 0xFFFFFFFF;
Flash_Cmd((unsigned long)addr, 1, &eraseValue, 0x40);
}
和“Flash_Cmd()”:
#define FLASH_MASS_ERASE_CMD 0x41
#define FLASH_ERASE_CMD 0x40
#define FLASH_PROGRAM_CMD 0x20
#define FLASH_BURST_CMD 0x25
UINT8 /*far*/
Flash_Cmd(UINT32 FlashAddress,
UINT16 FlashDataCounter,
UINT32 *pFlashDataPtr,
UINT8 FlashCommand)
{
/* Check to see if FACCERR or PVIOL is set */
if (FSTAT &0x30)
{
/* Clear Flags if set*/
FSTAT = 0x30;
}
if (FlashDataCounter)
{
do
{
/* Wait for the Last Busrt Command to complete */
while(!(FSTAT&FSTAT_FCBEF_MASK)){};/*wait until termination*/
/* Write Data into Flash*/
(*((volatile unsigned long *)(FlashAddress))) = *pFlashDataPtr;
FlashAddress += 4;
pFlashDataPtr++;
/* Write Command */
FCMD = FlashCommand;
/* Put FCBEF at 1 */
FSTAT = FSTAT_FCBEF_MASK;
asm (NOP);
asm (NOP);
asm (NOP);
/* Check if Flash Access Error or Protection Violation Error are Set */
if (FSTAT&0x30)
{
/* If so, finish the function returning 1 to indicate error */
return (1);
}
}while (--FlashDataCounter);
}
/* wait for the last command to complete */
while ((FSTAT&FSTAT_FCCF_MASK)==0){};/*wait until termination*/
/* Return zero to indicate that the function executed OK */
return (0);
}
我的 main 从未到达 for(;;) 循环,因为被第三次调用 EraseFlash() 阻塞。
如果我只调用两次或更少的电话,它就会起作用。 示例:
void main(void) {
EnableInterrupts;
Platform_GPIO_Init();
FlashInit();
DisableInterrupts;
EraseFlash(0x020000);
EraseFlash(0x020800);
EnableInterrupts;
for(;;) {
__RESET_WATCHDOG(); /* feeds the dog */
SetLED(2, 2); // Toggle led if the program is running
} /* loop forever */
/* please make sure that you never leave main */
}
有人可以告诉我我做错了什么吗?我还尝试了其他闪存地址并且没有禁用中断,结果是一样的。
编辑:两次调用都返回0,这意味着函数执行正常
谢谢大家!
最佳答案
我检查了数据表并更改了闪存驱动程序 header 中的 FLASH_CLOCK:
(SYSTEM_CLOCK/200000) 至 (SYSTEM_CLOCK/400000)
之前:
#if (SYSTEM_CLOCK/2) > 12800000 /* 12.8 MHz */
#define FLASH_CLOCK (UINT8)(( (SYSTEM_CLOCK/3200000) -1) | 0x40)
#else
#define FLASH_CLOCK (unsigned char)( (SYSTEM_CLOCK/200000) -1)//<200KHz
#endif
现在:
#if (SYSTEM_CLOCK/2) > 12800000 /* 12.8 MHz */
#define FLASH_CLOCK (UINT8)(( (SYSTEM_CLOCK/3200000) -1) | 0x40)
#else
#define FLASH_CLOCK (unsigned char)( (SYSTEM_CLOCK/400000) -1)//<200KHz
#endif
我的程序终于可以运行了。
关于c - 删除外部闪存(MCF51EM256 微 Controller ),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36283203/