MM32F3273G8P火龙果开发板MindSDK开发教程15 - 获取msa311加速器的方向改变事件

1、功能描述

类似手机里横屏竖屏检测，当方向发生变化时，横屏竖屏自动切换。
当msa311方向改变时，会产生中断，然后从寄存器Reg 0x0C(Orientation _Status) 中读取现在设备的方位。
有这几种可能，
1、 orientation value of z axis, 0:upward looking
orientation value of x/y axes
00: portrait upright
01: portrait upside down
10: landscape left,
11: landscape right

2、orientation value of z axis, 1:downward looking
orientation value of x/y axes
00: portrait upright
01: portrait upside down
10: landscape left,
11: landscape right

2、寄存器设置

在这里插入图片描述
这个寄存器可以设置orient功能的一些特性，但是我没有设置，保持默认值。

当中断产生后，读取09寄存器，bit6 一直都是0，所以程序里没有判断bit6的状态。

中断产生后，读取0x0C寄存器的值，从来判断模块的具体方位。

3、中断处理函数

void handle_int_message(void)
{
    uint8_t state;
    uint8_t orient_state;
    bool bRet;
    bRet = Msa311_ReadReg(MSA311_REG_MOTIONINT,&state);
    bRet = Msa311_ReadReg(MSA311_REG_ORIENTATION_STATUS,&orient_state);

	if (bRet == false)
	{
		perror("Msa311_GetInterrupt1Enable read error\n");
		return;
    }

    if (state & (1 << MSA311_S_TAP_INT_STATE))
    {
        printf("this is s_tap \r\n");
    }
    else if (state & (1 << MSA311_D_TAP_INT_STATE))
    {
        printf("this is d_tap \r\n");
    }
    else if (state & (1<< MSA311_ACTIVE_INT_STATE))
    {
        printf("this is active\r\n");
    }

    if (orient_state & 1<< 6)
    {
        printf("downward looking ");

        if ((orient_state & 0x30)>>4 == 0)
        {
            printf(" portrait upright \r\n");   
        }
        else if ((orient_state & 0x30)>>4 == 1)
        {
            printf(" portrait upside down \r\n");   
        }
        else if ((orient_state & 0x30 ) >> 4 == 2)
        {
            printf(" landscape left \r\n") ;  
        }
        else if ((orient_state & 0x30 ) >> 4 == 3)
        {
            printf(" landscape right \r\n");   
        }
    }
    else
    {
        printf("  upward looking  ");
        if ((orient_state & 0x30 ) >> 4 == 0)
        {
            printf(" portrait upright \r\n");   
        }
        else if ((orient_state & 0x30)>>4 == 1)
        {
            printf(" portrait upside down \r\n");   
        }
        else if ((orient_state & 0x30 ) >> 4 == 2)
        {
            printf(" landscape left \r\n") ;  
        }
        else if ((orient_state & 0x30 ) >> 4 == 3)
        {
            printf(" landscape right \r\n");   
        }
    }
}