求助：LM3S101组优先级到底是怎么回事????????????

LM3S101优先级只有8个，占用PRI_N的[7:5]位，<br />那么<br />优先级0&nbsp;PRI是00000000<br />优先级1&nbsp;PRI是00100000<br />优先级2&nbsp;PRI是01000000<br />优先级3&nbsp;PRI是01100000<br />优先级4&nbsp;PRI是10000000<br />优先级5&nbsp;PRI是10100000<br />优先级6&nbsp;PRI是11000000<br />优先级7&nbsp;PRI是11100000<br /><br />假设优先级是按NVIC_APINT_PRIGROUP_2_6分组，那么<br />优先级0&nbsp;PRI是00000000&nbsp;&nbsp;&nbsp;&nbsp;低组优先级<br />优先级1&nbsp;PRI是00100000&nbsp;&nbsp;&nbsp;&nbsp;低组优先级<br />优先级2&nbsp;PRI是01000000&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />优先级3&nbsp;PRI是01100000&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />优先级4&nbsp;PRI是10000000&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />优先级5&nbsp;PRI是10100000&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />优先级6&nbsp;PRI是11000000&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />优先级7&nbsp;PRI是11100000&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br /><br />综合起来，优先级7还必优先级0高，并切能嵌套优先级0？？？<br /><br /><br />

  

lm3s101默认组优先级划分是NVIC_APINT_PRIGROUP_7_1，<br />高七位是组高优先级位，最地位是组低优先级位？？？？？<br /><br />只有优先级0是低组优先级，其他优先级全部是高组优先级?<br />不对啊！？？？？<br /><br />LM3S101组优先级到底是怎么回事????????????<br />

继续问

明天我也研究一下……呵呵

LM3S101有8个中断优先级组，所以可以支持8级中断嵌套，同组优先级的中断不能嵌套，可以是中断迟来和末尾连锁。

to&nbsp;楼上<br />LM3S101有8个优先级是指具有8个组优先级？？优先级只占用3位，全部都用来做组优先级了，那么怎么设置次优先级呢？？？？

&nbsp;&nbsp;&nbsp;&nbsp;在群星系列单片机里，只取最高3位有效，也就是说最多只能设置8个优先级进行占先。如果您需要设置次优先级，那么可以改变NVIC_APINT_PRIGROUP寄存器，把它设置成5或者6（原来默认是0，但是群星只能是最高三位有效，所以到0-4效果都是一样。），那么减少了组优先级的设置数量，用减少的组优先级来设置次优先级。例如将NVIC_APINT_PRIGROUP寄存器6《8，这样只有1个组优先级，剩下两个位可以用来设置成次优先级。最好是用最高3位来做组优先级，次优先级可以利用默认的硬件优先级。<br />如果您还不是很明白，请给我们电话或者邮件,我们可以提供实验范例.<br />lm3@zlgmcu.com<br />020-22644252

多谢。<br />能否给easyarm101用组优先级和次优先级范例。<br />atmega32@126.com

  

组优先可以占先，次优先只能末尾连锁。

<br /><br />#define&nbsp;NVIC_APINT_PRIGROUP_7_1&nbsp;0x00000000&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;7.1&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_6_2&nbsp;0x00000100&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;6.2&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_5_3&nbsp;0x00000200&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;5.3&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_4_4&nbsp;0x00000300&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;4.4&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_3_5&nbsp;0x00000400&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;3.5&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_2_6&nbsp;0x00000500&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;2.6&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_1_7&nbsp;0x00000600&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;1.7&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_0_8&nbsp;0x00000700&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;0.8&nbsp;split<br /><br />请问：比如说优先级分组是NVIC_APINT_PRIGROUP_6_2，哪些优先级级是高组优先级，哪些是低组优先级？或者说PRI_N的值哪些是高组优先级，哪些是低组优先级呢？

<br />目前Luminary单片机的中断优先级只有8级，即：占用PRI_N的[7:5]位。<br />组优先级＋次优先级＝8级，所以最多有3位组优先级，或3位次优先级<br />对于优先级分组：<br />#define&nbsp;NVIC_APINT_PRIGROUP_7_1&nbsp;0x00000000&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;7.1&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_6_2&nbsp;0x00000100&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;6.2&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_5_3&nbsp;0x00000200&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;5.3&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_4_4&nbsp;0x00000300&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;4.4&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_3_5&nbsp;0x00000400&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;3.5&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_2_6&nbsp;0x00000500&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;2.6&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_1_7&nbsp;0x00000600&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;1.7&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_0_8&nbsp;0x00000700&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;0.8&nbsp;split<br />对Luminary单片机来说，以下4种设置无效：<br />#define&nbsp;NVIC_APINT_PRIGROUP_7_1&nbsp;0x00000000&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;7.1&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_6_2&nbsp;0x00000100&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;6.2&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_5_3&nbsp;0x00000200&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;5.3&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_4_4&nbsp;0x00000300&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;4.4&nbsp;split<br />&nbsp;<br />所以对于LM3S－－来说，只有以下设置优先级分组有效：<br />#define&nbsp;NVIC_APINT_PRIGROUP_3_5&nbsp;0x00000400&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;3.5&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_2_6&nbsp;0x00000500&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;2.6&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_1_7&nbsp;0x00000600&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;1.7&nbsp;split<br />#define&nbsp;NVIC_APINT_PRIGROUP_0_8&nbsp;0x00000700&nbsp;&nbsp;//&nbsp;Priority&nbsp;group&nbsp;0.8&nbsp;split<br />其中，NVIC_APINT_PRIGROUP_3_5&nbsp;组优先级3位，不能设置次优先级，可将任意外部中断设置成组优先级，优先级高低由用户设定；同理：NVIC_APINT_PRIGROUP_2_6&nbsp;组优先级2位，次优先级1位；&nbsp;NVIC_APINT_PRIGROUP_1_7组优先级1位，次优先级2位；NVIC_APINT_PRIGROUP_0_8无组优先级，全部为次优先级，而且中断只能采用末尾连锁。<br />注意：高组优先级可占先低组优先级；<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;组优先级相同的，次优先级间不能相互占先，即使具有较高的次优先级，同组内的次优先级只能采用末尾连锁方式。<br />所以，楼上说的优先级分组是NVIC_APINT_PRIGROUP_6_2的，对LM3S－默认全部为组优先级。<br /><br /><br /><br /><br />&nbsp;

高组优先级和低组优先级是用户自行设置的，不是简单的NVIC_APINT_PRIGROUP_6_2（PRI_N的值）就可以决定了的，它只是起到可以设置几位组优先级。<br />真正的高低组优先级需要在设置成的组优先级位中来设置。<br />注意设置中起作用的只有【7:5】位。

多谢。<br />我假设的优先级分组是NVIC_APINT_PRIGROUP_2_6，没说成NVIC_APINT_PRIGROUP_6_2。<br /><br /><br />LM3S101优先级只有8个，占用PRI_N的[7:5]位，<br />那么<br />优先级0&nbsp;PRI是000XXXXX<br />优先级1&nbsp;PRI是001XXXXX<br />优先级2&nbsp;PRI是010XXXXX<br />优先级3&nbsp;PRI是011XXXXX<br />优先级4&nbsp;PRI是100XXXXX<br />优先级5&nbsp;PRI是101XXXXX<br />优先级6&nbsp;PRI是110XXXXX<br />优先级7&nbsp;PRI是111XXXXX<br /><br />假设优先级是按NVIC_APINT_PRIGROUP_2_6分组(两位组优先级位，一位次优先级位)，那么<br />优先级0&nbsp;PRI是000XXXXX&nbsp;&nbsp;&nbsp;&nbsp;低组优先级<br />优先级1&nbsp;PRI是001XXXXX&nbsp;&nbsp;&nbsp;&nbsp;低组优先级<br />优先级2&nbsp;PRI是010XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />优先级3&nbsp;PRI是011XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />优先级4&nbsp;PRI是100XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />优先级5&nbsp;PRI是101XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />优先级6&nbsp;PRI是110XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />优先级7&nbsp;PRI是111XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br /><br />综合起来，优先级7还必优先级0高，并切能嵌套优先级0？？？&nbsp;<br />

你怎么还是没明白呢？书上这么说的低组高组么？<br />如果你改变了那三位的配置，你所谓的优先级0和1是同组分配次优先级。感觉有点郁闷了。

假设优先级是按NVIC_APINT_PRIGROUP_2_6分组(两位组优先级位，一位次优先级位)，那么PRI_N的[7:5]八种组合各代表什么优先级呢？

假设优先级是按NVIC_APINT_PRIGROUP_2_6分组(两位组优先级位，一位次优先级位)，那么PRI_N的[7:5]八种组合各代表什么优先级呢？<br /><br />8个优先级中可设4个组优先级，2个次优先级<br />00&nbsp;0&nbsp;XXXXX&nbsp;：组优先级0，次优先级0<br />00&nbsp;1&nbsp;XXXXX&nbsp;：组优先级0，次优先级1<br /><br />01&nbsp;0&nbsp;XXXXX&nbsp;：组优先级1，次优先级0<br />01&nbsp;1&nbsp;XXXXX&nbsp;：组优先级1，次优先级1<br /><br />10&nbsp;0&nbsp;XXXXX&nbsp;：组优先级2，次优先级0<br />10&nbsp;1&nbsp;XXXXX&nbsp;：组优先级2，次优先级1<br /><br />11&nbsp;0&nbsp;XXXXX&nbsp;：组优先级3，次优先级0<br />11&nbsp;1&nbsp;XXXXX&nbsp;：组优先级3，次优先级1<br /><br />NVIC_APINT_PRIGROUP_2_6分组如上，<br />而你说的：<br />&nbsp;&nbsp;&nbsp;优先级0&nbsp;PRI是000XXXXX&nbsp;&nbsp;&nbsp;&nbsp;低组优先级<br />&nbsp;&nbsp;&nbsp;优先级1&nbsp;PRI是001XXXXX&nbsp;&nbsp;&nbsp;&nbsp;低组优先级<br />&nbsp;&nbsp;&nbsp;优先级2&nbsp;PRI是010XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />&nbsp;&nbsp;&nbsp;优先级3&nbsp;PRI是011XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />&nbsp;&nbsp;&nbsp;优先级4&nbsp;PRI是100XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />&nbsp;&nbsp;&nbsp;优先级5&nbsp;PRI是101XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />&nbsp;&nbsp;&nbsp;优先级6&nbsp;PRI是110XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />&nbsp;&nbsp;&nbsp;优先级7&nbsp;PRI是111XXXXX&nbsp;&nbsp;&nbsp;&nbsp;高组优先级<br />优先级7：代表组优先级为3，次优先级为1<br />优先级0：代表组优先级为0，次优先级为0<br />所以优先级0&gt优先级7，优先级0可占先优先级7<br />优先级0-7只是代号而已。。。。。。。。。<br /><br />

LS说的很正确，AT应该好好看看……

00&nbsp;0&nbsp;XXXXX&nbsp;：组优先级0，次优先级0<br />00&nbsp;1&nbsp;XXXXX&nbsp;：组优先级0，次优先级1<br /><br />01&nbsp;0&nbsp;XXXXX&nbsp;：组优先级1，次优先级0<br />01&nbsp;1&nbsp;XXXXX&nbsp;：组优先级1，次优先级1<br /><br />10&nbsp;0&nbsp;XXXXX&nbsp;：组优先级2，次优先级0<br />10&nbsp;1&nbsp;XXXXX&nbsp;：组优先级2，次优先级1<br /><br />11&nbsp;0&nbsp;XXXXX&nbsp;：组优先级3，次优先级0<br />11&nbsp;1&nbsp;XXXXX&nbsp;：组优先级3，次优先级1<br /><br />1.综合起来是00&nbsp;0&nbsp;XXXXX优先级最高，11&nbsp;1&nbsp;XXXXX优先级最低？？<br />2.如果用要设置优先级分组是NVIC_APINT_PRIGROUP_2_6，设置systick优先级为组优先级3，次优先级1，用流明的库函数怎么实现？