【UCD3138 学习笔记之二】

//########################################################################### // // FILE: clear_program_flash.c // // TITLE: // // NOTES: // 1) //########################################################################### // // Ver | dd mmm yyyy | Who | Description of changes // ======|=============|============|======================================== // 00 05 04 2015 HPCS // // Texas Instruments, Inc // Copyright Texas Instruments 2008. All rights reserved. //########################################################################### #include "system_defines.h" #include "cyclone_device.h" #include "variables.h" #include "function_definitions.h" #include "software_interrupts.h" #define program_flash_integrity_word (*((volatile unsigned long *) 0x7ffc)) //last word in flash, when executing from Flash. used to store integrity code void clear_program_flash(void) { DecRegs.PFLASHCTRL.bit.MASS_ERASE = 1; //erase it all while(DecRegs.PFLASHCTRL.bit.BUSY != 0) { ; //do nothing while it programs } //now reset processor. // TimerRegs.WDCTRL.bit.CPU_RESET_EN = 1; // Make sure the watchdog is enabled. // TimerRegs.WDCTRL.bit.WD_PERIOD = 1; // Set WD period to timeout faster. return; } void zero_out_integrity_word(void) { DecRegs.FLASHILOCK.all = 0x42DC157E;// Write key to Program Flash Interlock Register DecRegs.MFBALR1.all = MFBALRX_BYTE0_BLOCK_SIZE_32K; //enable program flash write program_flash_integrity_word = 0; DecRegs.MFBALR1.all = MFBALRX_BYTE0_BLOCK_SIZE_32K + //expand program flash out to 4x real size MFBALRX_BYTE0_RONLY; while(DecRegs.PFLASHCTRL.bit.BUSY != 0) { ; //do nothing while it programs } SysRegs.SYSECR.bit.RESET = 2; //reset device return; }