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LSM6DS3连续FIFO中断
对于此讨论,1个样本= 6个字节的3d加速度计数据。 我想使用FIFO来节省CPU的电量。 只要所有样本数据都适合FIFO,所有数据都是直截了当的。 我无法弄清楚如何使用连续模式来读取更多样本 而不是适合FIFO。 例: 我想要读取2048个样本x 6个字节。 因为FIFO是8k,我打算读取2 x 1024个样本。我尝试过很多种组合 fifo状态位,但没有方法可行。这是一次尝试:设置 ----- FIFO_CTRL3.DEC_FIFO_XL = 1 CTRL4.DRDY_MASK = 1 FIFO_CTRL1 / 2.FTH = 3093 //(1024个样本+7个丢弃(我的设置))* 3 INT1_CTRL.INT1_FTH = 1 FIFO_CTRL5.FIFO_MODE = 6 //连续模式 --- if(FIFO_STATUS2.FIFO_FULL == 0) //首先阅读 //丢弃初始样本 //首先阅读1024个样本 // next watermark = 1024 - (MAX_FIFO - 已读取)。我通常在第一轮获得1031个样本, //所以1024 - (4095/3 - (1031)= 1024 - (1365 - 1031)= 1024 - 334 = 690. 690 * 3 = 2070 FIFO_CTRL1 / 2.FTH = 2070 INT1_CTRL.INT1_FTH = 0 INT1_CTRL.INT1_FULL_FLAG = 1 //再次调用isr时,此状态位永远不会被设置 CTRL4.STOP_ON_FTH = 1 //应设置完整位但不设置。仅设置FTH位。 TAP_CFG.LIR = 1 //没有区别 其他 //上次读了 //读取结束1024个样本并关闭XL // 注意! 'else'代码永远不会执行,因为FIFO_FULL状态永远不会得到setresult ---- 第一次中断 FIFO_STATUS1 / 2.DIFF_FIFO == 3093 //正确 FIFO_STATUS2.FTH == 1 //正确 FIFO_STATUS2.FIFO_FULL == 0 // correct2nd中断 FIFO_STATUS1 / 2.DIFF_FIFO == 2068 //错误 FIFO_STATUS2.FTH == 1 //正确 FIFO_STATUS2.FIFO_FULL == 0 //错误--- 为什么我没有看到预期的FIFO_FULL标志以及我应该改变什么。 请随意提出另一种方法! 以上来自于谷歌翻译 以下为原文 LSM6DS3 Continuous FIFO interrupts For this discussion 1 sample = 6 bytes of 3d accelerometer data. I want to use FIFO to save power on CPU. As long as all sample data fits in the FIFO, all is straight-forward. I'm unable to figure out how to use Continuous mode to read more samples than fit in the FIFO. Example: I want's to read 2048 samples x 6 bytes. Because FIFO is 8k I intend to read 2 x 1024 samples. I have tried many combinations of fifo status bits, but no approach works. Here's one attempt:setup -----FIFO_CTRL3.DEC_FIFO_XL = 1 CTRL4.DRDY_MASK = 1 FIFO_CTRL1/2.FTH = 3093 // (1024 samples + 7 discards (my setting)) *3 INT1_CTRL.INT1_FTH = 1 FIFO_CTRL5.FIFO_MODE = 6 // Continuous modeisr ---if (FIFO_STATUS2.FIFO_FULL == 0) // first read // discard initial samples // read first 1024 samples // next watermark = 1024 - (MAX_FIFO - already read). I usually get 1031 samples in first round, // so 1024 - ( 4095/3 - (1031 ) = 1024 - (1365 - 1031) = 1024 - 334 = 690. 690 * 3 = 2070 FIFO_CTRL1/2.FTH = 2070 INT1_CTRL.INT1_FTH = 0 INT1_CTRL.INT1_FULL_FLAG = 1 // This status bit never gets set when isr is called again CTRL4.STOP_ON_FTH = 1 // should set full bit but doesn't. Only FTH bit set. TAP_CFG.LIR = 1 // makes no difference else // last read. // Read ending 1024 samples and shut down XL // note! 'else' code never executes because FIFO_FULL status never gets setresult ---- 1st interrupt FIFO_STATUS1/2.DIFF_FIFO == 3093 // correct FIFO_STATUS2.FTH == 1 // correct FIFO_STATUS2.FIFO_FULL == 0 // correct2nd interrupt FIFO_STATUS1/2.DIFF_FIFO == 2068 // WRONG FIFO_STATUS2.FTH == 1 // correct FIFO_STATUS2.FIFO_FULL == 0 // WRONG--- Why am I not seeing expected FIFO_FULL flag and what should I change. Please feel free to suggest another method altogether! |
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对不起,在我的Feed中发现旧的僵尸未解答的问题
以上来自于谷歌翻译 以下为原文 Sorry, bumping old zombie unanswered questions off my feed |
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