AURIX TC397 Multicore 多核_tc397芯片资料

#include "Ifx_Types.h"
#include "IfxCpu.h"
#include "IfxScuWdt.h"

IFX_ALIGN(4) IfxCpu_syncEvent g_cpuSyncEvent = 0;

void core0_main(void)
{
    IfxCpu_enableInterrupts();
    
    /* !!WATCHDOG0 AND SAFETY WATCHDOG ARE DISABLED HERE!!
     * Enable the watchdogs and service them periodically if it is required
     */
    IfxScuWdt_disableCpuWatchdog(IfxScuWdt_getCpuWatchdogPassword());
    IfxScuWdt_disableSafetyWatchdog(IfxScuWdt_getSafetyWatchdogPassword());
    
    /* Wait for CPU sync event */
    IfxCpu_emitEvent(&g_cpuSyncEvent);
    IfxCpu_waitEvent(&g_cpuSyncEvent, 1);
    
    while(1)
    {
    }
}

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Cpu1_Main.c 内容默认为:

#include "Ifx_Types.h"
#include "IfxCpu.h"
#include "IfxScuWdt.h"

extern IfxCpu_syncEvent g_cpuSyncEvent;

void core1_main(void)
{
    IfxCpu_enableInterrupts();
    
    /* !!WATCHDOG1 IS DISABLED HERE!!
     * Enable the watchdog and service it periodically if it is required
     */
    IfxScuWdt_disableCpuWatchdog(IfxScuWdt_getCpuWatchdogPassword());
    
    /* Wait for CPU sync event */
    IfxCpu_emitEvent(&g_cpuSyncEvent);
    IfxCpu_waitEvent(&g_cpuSyncEvent, 1);
    
    while(1)
    {
    }
}

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其中:

• IFX_ALIGN(4) IfxCpu_syncEvent g_cpuSyncEvent = 0; 定义在CPU0的Main.c中, 在其它CPU中被引用. 一种共享内存的方法用于核间通信
• 各个CPU进来先开中断, 关自己的看门狗
• IfxCpu_waitEvent 该函数将一直等到所有内核在事件中都设置了它们相应的位. 该函数与IfxCpu_emitEvent一起用于实现已配置内核之间的同步, 默认情况下，为所有内核定义IFXCPU_CFG_ALLCORE_DONE宏
• 如果一个外设被多个CPU用, 其初始化可以放在Cpu0_Main.c中 /* Wait for CPU sync event */ 注释上面的地方.

Multicore Example

点灯为例, 如果一个核操作一个LED翻转, 互不干涉, 直接在各个Cpux_Main.c初始化延时翻转即可, 不存在冲突. 官方给的这个例子是3个核控制一个LED:

• 3个CPU都可以访问全局变量标志位
• Cpu0在其他CPU RUN之前初始化LED, while中判断标志位打开LED
• Cpu1 While中判断标志位关闭LED
• Cpu3 While中延时翻转标志位

Cpu0_Main.c 内容(注意LED初始化放到其它CPU初始化之前):

#include "Ifx_Types.h"
#include "IfxCpu.h"
#include "IfxScuWdt.h"

IFX_ALIGN(4) IfxCpu_syncEvent g_cpuSyncEvent = 0;

#define LED    &MODULE_P13, 0   /* LED D107 */
uint16 g_turnLEDon = FALSE;     /* Variable for the LED, CPU0 and CPU1 are toggling the LED depending on its state  */

void core0_main(void)
{
    IfxCpu_enableInterrupts();
    
    /* !!WATCHDOG0 AND SAFETY WATCHDOG ARE DISABLED HERE!!
     * Enable the watchdogs and service them periodically if it is required
     */
    IfxScuWdt_disableCpuWatchdog(IfxScuWdt_getCpuWatchdogPassword());
    IfxScuWdt_disableSafetyWatchdog(IfxScuWdt_getSafetyWatchdogPassword());
    
    //initLED
    IfxPort_setPinHigh(LED);
    IfxPort_setPinMode(LED, IfxPort_Mode_outputPushPullGeneral);

    //Initialize the time constants
    initTime();

    /* Wait for CPU sync event */
    IfxCpu_emitEvent(&g_cpuSyncEvent);
    IfxCpu_waitEvent(&g_cpuSyncEvent, 1);
    
    while(1)
    {
        if(g_turnLEDon == TRUE)
        {
            IfxPort_setPinLow(LED);     /* Turn on the LED (LED is low-level active)    */
        }
    }
}

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Cpu1_Main.c 内容:

#include "Ifx_Types.h"
#include "IfxCpu.h"
#include "IfxScuWdt.h"

extern IfxCpu_syncEvent g_cpuSyncEvent;

#ifndef LED
#define LED    &MODULE_P13, 0
#endif
extern uint16 g_turnLEDon;

void core1_main(void)
{
    IfxCpu_enableInterrupts();
    
    /* !!WATCHDOG1 IS DISABLED HERE!!
     * Enable the watchdog and service it periodically if it is required
     */
    IfxScuWdt_disableCpuWatchdog(IfxScuWdt_getCpuWatchdogPassword());
    
    /* Wait for CPU sync event */
    IfxCpu_emitEvent(&g_cpuSyncEvent);
    IfxCpu_waitEvent(&g_cpuSyncEvent, 1);
    
    while(1)
    {
        if(g_turnLEDon == FALSE)
        {
            IfxPort_setPinHigh(LED);    /* Turn off the LED (LED is low-level active)   */
        }
    }
}

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Cpu2_Main.c 内容:

#include "Ifx_Types.h"
#include "IfxCpu.h"
#include "IfxScuWdt.h"

extern IfxCpu_syncEvent g_cpuSyncEvent;

#include "Bsp.h"
#ifndef LED
#define LED    &MODULE_P13, 0
#endif
extern uint16 g_turnLEDon;

void core2_main(void)
{
    IfxCpu_enableInterrupts();
    
    /* !!WATCHDOG2 IS DISABLED HERE!!
     * Enable the watchdog and service it periodically if it is required
     */
    IfxScuWdt_disableCpuWatchdog(IfxScuWdt_getCpuWatchdogPassword());
    
    /* Wait for CPU sync event */
    IfxCpu_emitEvent(&g_cpuSyncEvent);
    IfxCpu_waitEvent(&g_cpuSyncEvent, 1);
    
    while(1)
    {
        g_turnLEDon = !g_turnLEDon;     /* Toggle the state of the global variable      */
        wait(TimeConst_1s);
    }
}

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当然, define或者全局变量的extern可以放到一个公共的头文件如Multicore.h中, 然后所有.c包含即可.

编译运行, LED每s翻转一次状态.

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