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Hello, I've written similar program to dskblink in C:\ti...folder which is shown below. include <stdio.h> #include <c6x.h> #include "c6711dsk.h" unsigned int ledstatus = 0x07000000; void delay(); /* my function #define LED1 0x06000000 #define LED2 0x05000000 #define LED3 0x03000000 int main() { /* DSP initialization */ CSR=0x100; /* Disable all interrupts */ IER=1; /* Disable all interrupts except NMI */ ICR=0xffff; /* Clear all pending interrupts */ *(unsigned volatile int *)EMIF_GCR = 0x3300; /* EMIF global control */ *(unsigned volatile int *)EMIF_CE1 = CE1_32; /* EMIF CE1 control, 32bit */ *(unsigned volatile int *)EMIF_SDCTRL = 0x07126000; /* EMIF SDRAM control */ *(unsigned volatile int *)EMIF_CE0 = 0x30; /* EMIF CE0 control */ *(unsigned volatile int *)EMIF_SDRP = 0x61a; /* EMIF SDRM refresh period */ *(unsigned volatile int *)EMIF_SDEXT= 0x54529; /* EMIF SDRM extension */ for (;;) { ledstatus = ledstatus & LED1; *(unsigned volatile int *)IO_PORT =ledstatus; delay(); /* my own function which uses timer0 to cause delay - I use CPU clock/4 as a internal clock */ ledstatus = ledstatus | ~LED1; *(unsigned volatile int *)IO_PORT =ledstatus; delay(); /* my own function which uses timer0 to cause delay- - I use CPU clock/4 as a internal clock */ */ } } Everything is fine if I work with the lower frequency (below 100 kHz of blinking LED1). The maximum frequency of blinking LED1 (I measured using the laboratory oscilloscope) which I achieved is about 100 kHz (even if I don't use procedure delay()). How can I achieve the higher frequencies? Did anybody check this or experience similar problem? I would be very glad if somebody could help me to solve this problem. Regards, Poul |
What is the maximum frequency of blinking user_leds of TMS320C6711 starter kit?
Started by ●February 14, 2003
