freertos的configMAX_PRIORITIES在哪里设置

FreeRTOS的`configMAX_PRIORITIES`宏定义是在FreeRTOSConfig.h头文件中定义的。这个宏定义用于设置系统支持的任务优先级的最大值。默认情况下，`configMAX_PRIORITIES`被设置为5。如果你需要更多的任务优先级，你可以将它设置为更高的值。

在FreeRTOSConfig.h头文件中，你可以找到以下代码行，可以修改这个宏定义：

#define configMAX_PRIORITIES             ( 5 )

你可以将`configMAX_PRIORITIES`的值修改为你需要的最大任务优先级。修改后，保存并重新编译你的FreeRTOS应用程序。

相关问题

configMAX_PRIORITIES

configMAX_PRIORITIES是FreeRTOS中用于配置任务优先级的参数。它的值表示任务优先级的最大数量。根据不同的方法，configMAX_PRIORITIES的最大值可能会有所不同。通用方法下，configMAX_PRIORITIES的最大值没有限制，但建议将其设置为最小必要值，因为较高的值会消耗更多的RAM并导致最差执行时间更长。而如果使用架构优化方法，configMAX_PRIORITIES不能大于32，并且同样建议将其保持在最小必要值，因为较高的值也会消耗更多的RAM。在FreeRTOS中，任务的优先级数值越小，任务的优先级越低。实际可使用的优先级范围是从0到configMAX_PRIORITIES-1。例如，如果将configMAX_PRIORITIES设置为5，则可使用的优先级号是0,1,2,3,4，不包括5。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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static struct bflb_device_s uart0; extern void shell_init_with_task(struct bflb_device_s shell); static int btblecontroller_em_config(void) { extern uint8_t __LD_CONFIG_EM_SEL; volatile uint32_t em_size; em_size = (uint32_t)&__LD_CONFIG_EM_SEL; if (em_size == 0) { GLB_Set_EM_Sel(GLB_WRAM160KB_EM0KB); } else if (em_size == 321024) { GLB_Set_EM_Sel(GLB_WRAM128KB_EM32KB); } else if (em_size == 641024) { GLB_Set_EM_Sel(GLB_WRAM96KB_EM64KB); } else { GLB_Set_EM_Sel(GLB_WRAM96KB_EM64KB); } return 0; } void bt_enable_cb(int err) { if (!err) { bt_addr_le_t bt_addr; bt_get_local_public_address(&bt_addr); printf("BD_ADDR:(MSB)%02x:%02x:%02x:%02x:%02x:%02x(LSB) \n", bt_addr.a.val[5], bt_addr.a.val[4], bt_addr.a.val[3], bt_addr.a.val[2], bt_addr.a.val[1], bt_addr.a.val[0]); ble_cli_register(); } } int main(void) { board_init(); configASSERT((configMAX_PRIORITIES > 4)); uart0 = bflb_device_get_by_name("uart0"); shell_init_with_task(uart0); /* set ble controller EM Size / btblecontroller_em_config(); / Init rf */ if (0 != rfparam_init(0, NULL, 0)) { printf("PHY RF init failed!\r\n"); return 0; } // Initialize BLE controller #if defined(BL702) || defined(BL602) ble_controller_init(configMAX_PRIORITIES - 1); #else btble_controller_init(configMAX_PRIORITIES - 1); #endif // Initialize BLE Host stack hci_driver_init(); bt_enable(bt_enable_cb); vTaskStartScheduler(); while (1) { } }用中文注释以上每一行代码，给出可复制代码

// 引入 uart0 设备
static struct bflb_device_s uart0;
// 声明 shell_init_with_task 函数，该函数会初始化 shell
extern void shell_init_with_task(struct bflb_device_s shell);

// btblecontroller_em_config 函数用于设置 BLE 控制器的 EM Size
static int btblecontroller_em_config(void)
{
    // 获取 __LD_CONFIG_EM_SEL 变量的地址，该变量在链接时会被赋值为 EM Size
    extern uint8_t __LD_CONFIG_EM_SEL;
    volatile uint32_t em_size;
    em_size = (uint32_t)&__LD_CONFIG_EM_SEL;

    // 根据 EM Size 设置 BLE 控制器的 EM Size
    if (em_size == 0) {
        GLB_Set_EM_Sel(GLB_WRAM160KB_EM0KB);
    } else if (em_size == 321024) {
        GLB_Set_EM_Sel(GLB_WRAM128KB_EM32KB);
    } else if (em_size == 641024) {
        GLB_Set_EM_Sel(GLB_WRAM96KB_EM64KB);
    } else {
        GLB_Set_EM_Sel(GLB_WRAM96KB_EM64KB);
    }

    return 0;
}

// bt_enable_cb 函数会在 BLE 蓝牙启用完成后被调用
void bt_enable_cb(int err)
{
    if (!err) {
        // 获取本地 Public Address，并打印出来
        bt_addr_le_t bt_addr;
        bt_get_local_public_address(&bt_addr);
        printf("BD_ADDR:(MSB)%02x:%02x:%02x:%02x:%02x:%02x(LSB) \n", 
               bt_addr.a.val[5], bt_addr.a.val[4], bt_addr.a.val[3], 
               bt_addr.a.val[2], bt_addr.a.val[1], bt_addr.a.val[0]);
        // 注册 BLE CLI
        ble_cli_register();
    }
}

// main 函数
int main(void)
{
    // 初始化板级硬件
    board_init();
    // 确保 FreeRTOS 的优先级大于 4
    configASSERT((configMAX_PRIORITIES > 4));
    // 获取 uart0 设备
    uart0 = bflb_device_get_by_name("uart0");
    // 初始化 shell
    shell_init_with_task(uart0);

    // 设置 BLE 控制器的 EM Size
    btblecontroller_em_config();

    // 初始化射频
    if (0 != rfparam_init(0, NULL, 0)) {
        printf("PHY RF init failed!\r\n");
        return 0;
    }

    // 初始化 BLE 控制器
#if defined(BL702) || defined(BL602)
    ble_controller_init(configMAX_PRIORITIES - 1);
#else
    btble_controller_init(configMAX_PRIORITIES - 1);
#endif

    // 初始化 BLE Host stack
    hci_driver_init();

    // 启用 BLE 蓝牙
    bt_enable(bt_enable_cb);

    // 启动 FreeRTOS 调度器
    vTaskStartScheduler();

    while (1) {
    }
}