Steins7
ca935a7650
Avoid repitions between comments and code. Additionnal usage information can be added as header comment and additionnal technical information can be added in the source file
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/** @file flash.c
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* Module handling flash memory interface registers.
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*
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* The module provides functions to configure the flash and perform read and
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* writes
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*/
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//--includes--------------------------------------------------------------------
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#include "flash.h"
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#include "flash_regs.h"
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//--local definitions-----------------------------------------------------------
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//--local variables-------------------------------------------------------------
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static volatile struct FLASH* regs = (struct FLASH*)FLASH_BASE_ADDRESS;
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//--public functions------------------------------------------------------------
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/**
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* Sets the correct latency to compensate the core's clock speed. Latency must
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* never be too low or the system will crash due to errors when accessing the
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* flash, hence the warning in the header
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*/
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void flash_configure(enum FlashPreset preset)
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{
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//restore default configuration
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regs->ACR.word &= !0x3f;
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regs->ACR.word |= 0x30;
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//apply new configuration
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switch (preset) {
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case FLASH_PRESET_LOW_CLOCK_SPEED:
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regs->ACR.HLFCYA = 0x1; //half cycle for power saving
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break;
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case FLASH_PRESET_MEDIUM_CLOCK_SPEED:
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regs->ACR.LATENCY = 0x1;
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break;
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case FLASH_PRESET_HIGH_CLOCK_SPEED:
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regs->ACR.LATENCY = 0x2;
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break;
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default:
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break;
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}
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}
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//--local functions-------------------------------------------------------------
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