Specifications

SH7670 Group Example of Cache Memory Setting
R01AN0300EJ0101 Rev. 1.01 Page 10 of 12
Oct. 15, 2010
3.3 Sample program list "main.c" (3)
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/* ---- Filling SDRAM area ---- */
ptr1 = SDRAM_ADDR_CACHABLE; /* Cache-enabled space */
for(i=0; i<16; i++){ /* Only written to the cache */
*ptr1++ = 0x55; /* in write-back mode */
}
/* ==== Comparing cache-enabled and cache-disabled spaces ==== */
ptr1 = SDRAM_ADDR_CACHABLE; /* Cache-enabled space */
ptr2 = SDRAM_ADDR_NON_CACHABLE; /* Cache-disabled space */
for(i=0; i<16; i++){
if(*ptr1++ == *ptr2++ ){
while(1){
/* Error in cache setting */
}
}
}
while(1){
/* Program end */
}
}
#pragma section CACHE /* Allocated to a non-cacheable area */
/*""FUNC COMMENT""*************************************************************
* ID :
* Outline : Cache setting
*-----------------------------------------------------------------------------
* Include : #include <machine.h>
* : #include "iodefine.h"
*-----------------------------------------------------------------------------
* Declaration : int io_set_cache(unsigned int mode)
*-----------------------------------------------------------------------------
* Function : Cache is placed in the mode specified by the argument "mode".
*-----------------------------------------------------------------------------
* Argument : unsigned int mode : I : Set the value of cache control register 1
*-----------------------------------------------------------------------------
* ReturnValue : 0 : Normally finished
*-----------------------------------------------------------------------------
* Notice : This function must be allocated in the CSO non-cacheable area.
* : Interrupts are disabled during cache operation.
*""FUNC COMMENT END""*********************************************************/
int io_set_cache(unsigned int mode)
{
int mask;
mask = get_imask(); /* ↓↓↓ interrupts disabled ↓↓↓ */
set_imask(15);
/* ==== Setting cache register ==== */
CCNT.CCR1.LONG = mode;
set_imask(mask); /* ↑↑↑ interrupts disabled ↑↑↑ */
return 0;
}
/* End of file */