TI中文支持网板子加电后子隔一段时间就会reset，发现watchdog 2是默认开启的， 定时reset，所以想关闭定时器
手册里写到：
程序运行之后定时器并没有停止工作，最终发现需要在写入寄存器之后加入空循环，让系统等待一段时间，停止定时器的命令才会生效
*reg_wdtimer2_wspr = 0x0000AAAA;
while (*reg_wdtimer2_wspr & ~0x0000AAAA){};
for (i=0; i<100; i++){}; // 空循环
*reg_wdtimer2_wspr = 0x00005555;
while (*reg_wdtimer2_wspr & ~0x00005555){};
for (i=0; i<100; i++){};
但手册里并没有提到这一点， 也不知道到底应该等多久
有没有什么更好的办法关闭定时器？
我也试着关闭iclk和fclk， 但似乎不起作用
Zhiwen He：
还有个问题是看门狗关闭之后修改参数再重新开启，代码如下，用过用xds100v2逐行调试的时候没有问题，但存到sd卡在板子上就运行不了， uart也不输出， 如果只保留关闭看门狗的代码， 注释掉修改参数和开启看门狗的代码， 程序在板子上就能正常运行， 请问这又是为什么？
// disable watchdog 2 uart_write("Turn off watchdog 2…"); *reg_wdtimer2_wspr = 0x0000AAAA; for (i=0; i<100; i++){}; // It takes sometime to make the change on register. while (*reg_wdtimer2_wspr & ~0x0000AAAA){}; for (i=0; i<100; i++){}; *reg_wdtimer2_wspr = 0x00005555; while (*reg_wdtimer2_wspr & ~0x00005555){};/* *reg_wdtimer2_wldr = 0x0;// *reg_wdtimer2_wtgr = 0xFFFFF000;
// enable watchdog 2 uart_write("Turn on watchdog 2…"); *reg_wdtimer2_wspr = 0x0000BBBB; for (i=0; i<100; i++){}; // It takes sometime to make the change on register. while (*reg_wdtimer2_wspr & ~0x0000BBBB){}; *reg_wdtimer2_wspr = 0x00004444; for (i=0; i<100; i++){}; while (*reg_wdtimer2_wspr & ~0x00004444){};
Tony Tang：
回复 Zhiwen He:
while检查搞错寄存器了，是要检查WDT_WWPS[W_PEND_WSPR]，直到为0（no pending)再往下走。
20.4.3.8 Start/Stop Sequence for Watchdog Timers (Using the WDT_WSPR Register)To start and stop a watchdog timer, access must be made through the start/stop register (WDT_WSPR)using a specific sequence.To disable the timer, follow this sequence:1. Write XXXX AAAAh in WDT_WSPR.2. Poll for posted write to complete using WDT_WWPS.W_PEND_WSPR.3. Write XXXX 5555h in WDT_WSPR.4. Poll for posted write to complete using WDT_WWPS.W_PEND_WSPR.
To enable the timer, follow this sequence:1. Write XXXX BBBBh in WDT_WSPR.2. Poll for posted write to complete using WDT_WWPS.W_PEND_WSPR.3. Write XXXX 4444h in WDT_WSPR.4. Poll for posted write to complete using WDT_WWPS.W_PEND_WSPR.All other write sequences on the WDT_WSPR register have no effect on the start/stop feature of themodule.
Zhiwen He：
回复 Tony Tang:
谢谢回复
