这是CC2538的定时器例程,定时1s,请问一下这个1s怎么计算的?255那两个地方我感觉怎么改都没啥用,我想定时1分钟应该怎么改程序?有没有哪位大佬帮帮忙的,谢谢
// Set the clocking to run directly from the external crystal/oscillator.
// (no ext 32k osc, no internal osc)
//
SysCtrlClockSet(false, false, SYS_CTRL_SYSDIV_32MHZ);
//
// Set IO clock to the same as system clock
//
SysCtrlIOClockSet(SYS_CTRL_SYSDIV_32MHZ);
//
// The
timer0 peripheral must be enabled for use.
//
SysCtrlPeripheralEnable(SYS_CTRL_PERIPH_GPT0);
// Configure GPTimer0B as a 16-bit periodic timer.
//
TimerConfigure(GPTIMER0_BASE, GPTIMER_CFG_SPLIT_PAIR |
GPTIMER_CFG_A_PERIODIC |GPTIMER_CFG_B_PERIODIC);
//
// Configure GPTimer0B clock prescaler for 255. This will make the
// effective timer clock be SYSCLOCK / 255.
//
TimerPrescaleSet(GPTIMER0_BASE, GPTIMER_B, 255);
//
// Set the GPTimer0B load value to 1sec by setting the timer load value
// to SYSCLOCK / 255. This is determined by:
// Prescaled clock = 16Mhz / 255
// Cycles to wait = 1sec * Prescaled clock
//
TimerLoadSet(GPTIMER0_BASE, GPTIMER_B, SysCtrlClockGet() / 255);