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in arm development studio,
debugging with base model for a53 single core,
config timer sp804 at address 0x001C110000,
// SP804 base addr volatile unsigned int* const TIMER0_BASE = (unsigned int*)0x001C110000; // SP804 registers offset #define TIMER0_LOAD_OFFSET 0x00 #define TIMER0_CONTROL_OFFSET 0x08 void init_timer() { // init value TIMER0_BASE[TIMER0_LOAD_OFFSET] = 0x2000; // cfg control reg unsigned int control = 0; // control |= (1 << 7); // enable interrupt control |= (1 << 6); // up count control |= (1 << 1); // periodical control |= (1 << 0); // enable timer TIMER0_BASE[TIMER0_CONTROL_OFFSET] = control; }
read current Current Value Register, TimerXValue more than 2 times,
no change was observed
why?
It is not obvious from the above code snippet what the issue could be. Does the disassembly show that the write(s) occured?
Try importing the startup_Cortex-A53x1 example supplied with Arm Development Studio. There is sp804_timer.c source therein that configures the timer that you can use as comparison with your code.
It works! There must be something wrong with my project attr I guess. thanks very much.