[经验]

lpc54114双核通信--互斥

2018-4-19 16:29:34

2273

本帖最后由 lee_st 于 2018-4-20 07:36 编辑

前个帖子实现了中断通信，本帖主要实现非中断情况下的互斥通信。
在前一帖子代码的基础上稍加更改，把M4核和M0+核的中断去除，
在M4核中更改的代码有
/* Init Mailbox */
MAILBOX_Init(MAILBOX);

/* Boot source for Core 1 from flash */
SYSCON->CPBOOT = SYSCON_CPBOOT_BOOTADDR(*(uint32_t *)((uint8_t *)CORE1_BOOT_ADDRESS + 0x4));
SYSCON->CPSTACK = SYSCON_CPSTACK_STACKADDR(*(uint32_t *)CORE1_BOOT_ADDRESS);

int32_t temp = SYSCON->CPCTRL;
temp |= 0xc0c48000;
SYSCON->CPCTRL = (temp | SYSCON_CPCTRL_CM0RSTEN_MASK);
SYSCON->CPCTRL = (temp);
delay();
MAILBOX_SetValue(MAILBOX, kMAILBOX_CM0Plus, (uint32_t)&g_msg);
while (1)
{
      /* Stop secondary core execution. */
      if (!GPIO_ReadPinInput(BOARD_SW1_GPIO, BOARD_SW1_GPIO_PORT, BOARD_SW1_GPIO_PIN))
      {
         MCMGR_StopCore(kMCMGR_Core1);
                                       PRINTF("Stopped Secondary core.n");
         delay();
      }
      /* Start core from reset vector */
      if (!GPIO_ReadPinInput(BOARD_SW2_GPIO, BOARD_SW2_GPIO_PORT, BOARD_SW2_GPIO_PIN))
      {
                                       PRINTF("Started Secondary core.n");
         MCMGR_StartCore(kMCMGR_Core1, CORE1_BOOT_ADDRESS, 5, kMCMGR_Start_Synchronous);
         delay();
      }
                              PRINTF("M4 receive:%drn",M0_TO_M4_R);
                              delay();
                              M4_TO_M0_T++;
      /* Get Mailbox mutex */
      while (MAILBOX_GetMutex(MAILBOX) == 0)
         ;

      /* The core0 has mutex, can change shared variable _XiaoMaGe */
      g_msg++;

      PRINTF("M4 : mailbox mutex,the data is: %dn", g_msg);

      /* Set mutex to allow access other core to shared variable */
      MAILBOX_SetMutex(MAILBOX);
}
在M0+内核更改的代码
/* Init Mailbox */
MAILBOX_Init(MAILBOX);
while (1)
{
      delay();
                        M0_TO_M4_T++;
                        PRINTF("M0receive:%drn",M4_TO_M0_R);
                        GPIO_TogglePinsOutput(GPIO, 0u, 1u << 15u);
                        GPIO_TogglePinsOutput(GPIO, 0u, 1u << 19u);
                        GPIO_TogglePinsOutput(GPIO, 0u, 1u << 21u);
                        GPIO_TogglePinsOutput(GPIO, 0u, 1u << 22u);
                        GPIO_TogglePinsOutput(GPIO, 0u, 1u << 25u);
                        GPIO_TogglePinsOutput(GPIO, 0u, 1u << 26u);
                        GPIO_TogglePinsOutput(GPIO, 0u, 1u << 29u);
                        GPIO_TogglePinsOutput(GPIO, 0u, 1u << 30u);
   /* Get Mailbox mutex */
      while (MAILBOX_GetMutex(MAILBOX) == 0)
         ;
      g_msg = (uint32_t *)MAILBOX_GetValue(MAILBOX, kMAILBOX_CM0Plus);
      /* The core1 has mutex, can change shared variable _XiaoMaGe */
      if (g_msg != NULL)
      {
         (*g_msg)++;
         PRINTF("M0 : mailbox mutex,the data is :%dn", *g_msg);
      }

      /* Set mutex to allow access other core to shared variable */
      MAILBOX_SetMutex(MAILBOX);
}
编译下载，串口助手观察通信见下图