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SampleAPP默认总线时钟是16MHZ 吗？
默认你是说上电后还是初始化后，初始化后是32Mhz.
上电时，都是关闭的，进入active 16MRC和32M晶振都会打开，然后就根据你的选择。
#define HAL_BOARD_INIT() \{ \ uint16 i; \ \ SLEEPCMD &= ~OSC_PD; /* turn on 16MHz RC and 32MHz XOSC */ \ while (!(SLEEPSTA & XOSC_STB)); /* wait for 32MHz XOSC stable */ \ asm("NOP"); /* chip bug workaround */ \ for (i=0; i<504; i++) asm("NOP"); /* Require 63us delay for all revs */ \ CLKCONCMD = (CLKCONCMD_32MHZ | OSC_32KHZ); /* Select 32MHz XOSC and the source for 32K clock */ \ while (CLKCONSTA != (CLKCONCMD_32MHZ | OSC_32KHZ)); /* Wait for the change to be effective */ \ SLEEPCMD |= OSC_PD; /* turn off 16MHz RC */ \ \ /* Turn on cache prefetch mode */ \ PREFETCH_ENABLE(); \ \ HAL_TURN_OFF_LED1(); \ LED1_DDR |= LED1_BV; \ HAL_TURN_OFF_LED2(); \ LED2_DDR |= LED2_BV; \ HAL_TURN_OFF_LED3(); \ LED3_DDR |= LED3_BV; \ \ /* configure tristates */ \ P0INP |= PUSH2_BV; \}
在我没有做任何更改的情况下，总线频率是32MHZ ？延时程序老是做不好，所以想咨询一下初始化后的总线频率
是啊，初始化程序都贴给你看了。延迟是硬delay还是软delay, us 还是ms?
us，输出输入延迟
借鉴下面的思路，32 NOP就是1usecs
void WaitMs(uint16 ms){ uint16 us;/* 32 NOPs == 1 usecs */ while (ms--) { us=1000; while (us--) { /* 32 NOPs == 1 usecs */ asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); asm("nop"); } } }
好的，谢谢，太详细了
请确认已结束这个topic。thanks
