I’m trying to command a stepper motor controller through SPI, and I found that I could not send commands as quickly as I was expecting. After some profiling, I narrowed it down to this call: clock_gettime(CLOCK_MONOTONI…
由于我需要芯片选择线从高到低之间的消息-线ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);将无法工作,因为它把数据作为一个单一的消息。即使我将ioctl()放在for循环中,它也不能工作,因为它是第一条也是最后一条消息。 以下代码工作 代码语言:javascript 运行 AI代码解释 staticvoidtransfer(int fd){int ret;...
a = ioctl(spi_device, SPI_IOC_MESSAGE(1), &k); ioctl 读一个结构体 struct spi_ioc_transfer k; https://blog.csdn.net/liangxiaozhang/article/details/7601880
speed_hz=speed; tr.bits_per_word=bits; ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr); if (ret < 1) { printf("can't send spi message"); } else { //printf("Send spi message OK %d\n",RxBuf[0]); } return 1; } /** * 功能:关闭SPI模块 */ int SPI_Close(void) { int fd...
ioctl(fd, SPI_IOC_MESSAGE(1), xfer); Can anyone tell me how I might go about figuring out what’s wrong and how to fix it? Take 22 milliseconds for a single SPI transaction is completely intolerable for my application, so I have to fix this. ...
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