AC7802x支持NMI（不可屏蔽中断）。开发板引出了NMI（PB2）到按键。经学习示例：\AC7802x_Demo_V1.0.0\GPIO\SampleCode\04_GPIO_NMI_Wakeup示例，下面体验如何在linux下面实现对NMI的编程。1. 新建文件夹：AC7802_NMI文件夹，并把原来【杰发科技AC7802x测评】linux下开发按键中断试验 - - 21ic电子技术开**坛的工程文件复到该文件夹下：cp -r ./AC7802_GPIO/* ./AC7802_NMI/
2、用vscode打开该文件夹，并修改gpio.h如下:
- #ifndef _GPIO_H__
- #define _GPIO_H__
- #include "ac780x_gpio.h"
- #define LED1_PORT (GPIOA)
- #define LED1_PIN (GPIO_PIN2)
- #define LED2_PORT (GPIOA)
- #define LED2_PIN (GPIO_PIN3)
- /*LED1动作定义.*/
- #define LED1_ON do{GPIO_SetPinLevel(LED1_PORT, LED1_PIN, GPIO_LEVEL_HIGH);}while(0)
- #define LED1_OFF do{GPIO_SetPinLevel(LED1_PORT, LED1_PIN, GPIO_LEVEL_LOW);}while(0)
- #define LED1_TOGGLE do{if(GPIO_GetPinLevel(LED1_PORT, LED1_PIN)){LED1_OFF;}else{LED1_ON;}}while(0)
- /*LED2动作定义.*/
- #define LED2_ON do{GPIO_SetPinLevel(LED2_PORT, LED2_PIN, GPIO_LEVEL_HIGH);}while(0)
- #define LED2_OFF do{GPIO_SetPinLevel(LED2_PORT, LED2_PIN, GPIO_LEVEL_LOW);}while(0)
- #define LED2_TOGGLE do{if(GPIO_GetPinLevel(LED2_PORT, LED2_PIN)){LED2_OFF;}else{LED2_ON;}}while(0)
- #define KEY_PORT (GPIOA)
- #define KEY_PIN (GPIO_PIN11)
- #define NMI_PORT (GPIOB)
- #define NMI_PIN (GPIO_PIN2)
- void GPIO_LedInit(void);
- void GPIO_NMIInit(void);
- void GPIO_MCUGotoSleep(void);
- #endif
2、修改gpio.c如下：
- #include "gpio.h"
- #include "stdbool.h"
- void GPIO_LedInit(void)
- {
- GPIO_SetFunc(LED1_PORT, LED1_PIN, GPIO_FUN0);
- GPIO_SetFunc(LED2_PORT, LED2_PIN, GPIO_FUN0);
- GPIO_SetDir(LED1_PORT, LED1_PIN, GPIO_OUT);
- GPIO_SetDir(LED2_PORT, LED2_PIN, GPIO_OUT);
- LED1_ON;
- LED2_ON;
- }
- void GPIO_NMIInit(void)
- {
- GPIO_SetFunc(NMI_PORT, NMI_PIN, GPIO_FUN1);
- SPM_EnableModuleWakeup(SPM_MODULE_NMI, ENABLE);
- }
- void GPIO_MCUGotoSleep(void)
- {
- mdelay(2000);
- LED1_OFF;
- LED2_OFF;
- SysStop();
- LED1_ON;
- LED2_ON;
- }
- #include "main.h"
- #include "AC7802x_irq_cb.h"
- #include "ac780x_gpio.h"
- #include "gpio.h"
- int main(void)
- {
- InitDelay();
- GPIO_LedInit();
- GPIO_NMIInit();
- while(1)
- {
- GPIO_MCUGotoSleep();
- }
- }
TARGET = AC7802_NMI
5、makeclearn 再编译执行make就生成了AC7802_NMI.elf的固件：
- arm-none-eabi-size build/AC7802_NMI.elf
- text data bss dec hex filename
- 2904 8 2112 5024 13a0 build/AC7802_NMI.elf
- arm-none-eabi-objcopy -O ihex build/AC7802_NMI.elf build/AC7802_NMI.hex
- arm-none-eabi-objcopy -O binary -S build/AC7802_NMI.elf build/AC7802_NMI.bin
- lugl@lugl-virtual-machine:~/ac7802/AC7802_NMI$
- lugl@lugl-virtual-machine:~/ac7802/AC7802_NMI$ pyocd load ./build/AC7802_NMI.elf --target ac78022mbqa
- 0000372 I Loading /home/lugl/ac7802/AC7802_NMI/build/AC7802_NMI.elf [load_cmd]
- [==================================================] 100%
- 0000832 I Erased 0 bytes (0 sectors), programmed 0 bytes (0 pages), skipped 3072 bytes (6 pages) at 6.54 kB/s [loader]
【总结】AC7802是基于Cortex-M0+的内核，支持NMI的中断。相比其他中断，他的配置更新精简。
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