msp432中断优先级设置

user4974765

Intellectual 260 points

MAP_Interrupt_setPriority(INT_TA0_0, 0x44);
MAP_Interrupt_setPriority(INT_TA3_0, 0x50);

请问目前msp432,设置定时器A0的优先级高于定时器A3，但是在单片机运行时，常常出现定时器A0中断来时，无法马上从定时器A3中断中退出

7 年多前

0 gaoyang9992006 7 年多前

Guru 42467 points

不太清楚，其他的优先级数被使用了吗，如果没有换0x20和0x40试试看，我看官方例子是用的这两个。

0 Susan Yang 7 年多前

TI__Guru**** 252096 points

"The hardware priority mechanism only looks at the upper N bits of the priority level (where N is 3 for the MSP432 family), so any prioritization must be performed in those bits. The remaining bits can be used to sub-prioritize the interrupt sources, and may be used by the hardware priority mechanism on a future part".

所以有效的优先级分配是类似下面这样

Interrupt_setPriority（interrupt_number_1,0x00）; //最高优先级
Interrupt_setPriority（interrupt_number_2,0x20）;
Interrupt_setPriority（interrupt_number_3,0x40）;
Interrupt_setPriority（interrupt_number_4,0x60）;
Interrupt_setPriority（interrupt_number_5,0x80）;
Interrupt_setPriority（interrupt_number_6,0xA0）;
Interrupt_setPriority（interrupt_number_7,0xC0）;
Interrupt_setPriority（interrupt_number_8,0xE0）; //最低优先级

0 user4974765 7 年多前回复 Susan Yang

Intellectual 260 points

MAP_Interrupt_setPriority(INT_PORT6, 0x40);//key
MAP_Interrupt_setPriority(INT_ADC14, 0x60);
MAP_Interrupt_setPriority(INT_EUSCIA0, 0x20);
MAP_Interrupt_setPriority(INT_EUSCIA1, 0x20);//UART
MAP_Interrupt_setPriority(INT_EUSCIA3, 0x20);//flash
MAP_Interrupt_setPriority(INT_EUSCIB0, 0x20); //Empprom
MAP_Interrupt_setPriority(INT_PORT2, 0x80);
MAP_Interrupt_setPriority(INT_RTC_C, 0xE0);
MAP_Interrupt_setPriority(INT_WDT_A, 0xC0);
在重新分配有效的优先级后，发现在程序运行时，部分全局变量会突变；
debug发现定义的bool g_TempType=false;extern bool g_TempType;
Watch窗口的值g_TempType=0x88;
是不是由于定义的堆栈空间不足引起的？

以下是我的堆栈分配情况：
"A0": place at 0x00000000 { ro section .intvec };
"P1": place in [from 0x00000000 to 0x0003ffff] |
[from 0x00200000 to 0x00203fff] { ro };
define block CSTACK with size = 12K, alignment = 8 { };
define block HEAP with size = 8K, alignment = 8 { };
"P3": place in [from 0x01000000
to 0x0100ffff
repeat 2
displacement 0x1f000000] { rw, block CSTACK, block HEAP };
do not initialize { section .noinit };
initialize by copy { rw };

No sections matched the following patterns:

ro section application_specific_ro in "P2|P4"
rw section application_specific_rw in "P2|P4"

0 gaoyang9992006 7 年多前回复 user4974765

Guru 42467 points

你自己修改了默认的堆栈配置？用官方默认的试试看。

0 user4974765 7 年多前回复 gaoyang9992006

Intellectual 260 points

用官方默认堆栈配置，试了仍然无法解决，全局变量被覆盖问题；
"A0": place at 0x00000000 { ro section .intvec };
"P1": place in [from 0x00000000 to 0x0003ffff] |
[from 0x00200000 to 0x00203fff] { ro };
define block CSTACK with size = 8K, alignment = 8 { };
define block HEAP with size = 16K, alignment = 8 { };
"P3": place in [from 0x01000000
to 0x0100ffff
repeat 2
displacement 0x1f000000] { rw, block CSTACK, block HEAP };
do not initialize { section .noinit };
initialize by copy { rw };

0 gaoyang9992006 6 年多前回复 user4974765

Guru 42467 points

这个中断优先级的解决了没，之前那个全局变量被串改的事情解决了没，是什么原因引起的？

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msp432中断优先级设置