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Hello,
I have a some problem with undestanding of how CyU3PSysCacheIRegion() function works at my Ez-USB FX3 DVK board.
I want to place a simple assembly function that generates impulses on the GPIO[0] pin into the I-Cache for fast implementation. At first call of my function I see on the logic analyzer's screen that NOP operations are implemented at frequency 100 MHZ. At second call of my function NOPs are implemented at 200 Mhz. What can I do for the correct ipmplementation of NOPs at 200 Mhz in my function at first call?
The peace of C code is:
//----------------------------------------------------------
CyU3PSysEnableICache();
CyU3PSysFlushICache();
CyU3PSysCacheIRegion((uint32_t*)0x40009ba0, 0x0800);
CyFX3GpioSetValN();
CyFX3GpioSetValN();
CyFX3GpioSetValN();
CyFX3GpioSetValN();
CyFX3GpioSetValN();
CyFX3GpioSetValN();
CyFX3GpioSetValN();
CyFX3GpioSetValN();
//----------------------------------------------------------
The 0x40009ba0 is address of first operation in my function into SRAM.
Assembly code of my function is:
//------------------------------------------------------------------
.global CyFX3GpioSetValN
CyFX3GpioSetValN:
push {r4, r5, r6, lr}
//ldr r5, [r4,] // # 0xe0001100
mov r5, # 0xe0000000
mov r6, # 0x00001100
add r5, r5, r6 //Address of GPIO[0]
mov r4, # 0x80000030//-2147483600
mov r6, # 0x80000031
str r4, [r5] //Set gpio to LOW
str r6, [r5] //SET gpio to HIGH
NOP
NOP
NOP
NOP
NOP
str r4, [r5] //Set gpio to LOW
NOP
NOP
NOP
NOP
NOP
pop {r4, r5, r6, r7, pc}
.end
//------------------------------------------------------------------
Also, I have interested of minimal Length of code region that I can put into I-cahce with the help of CyU3PSysCacheIRegion() function.
Regards,
-EugeneR
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Hi,
I will try to recreate this on my side and let you know.
Regards,
- Madhu Sudhan
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Hi Eugene,
Can you please share your whole project here?
Regards,
- Madhu Sudhan
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