c - XGpio_SetDataDirection，Xilinx，C 开发人员

Question

我的问题是，这个函数 XGpio_SetDataDirection 的作用是什么，en C。例如 XGpio_SetDataDirection (&gp_out, 1, 0x00) ？

Answer 1

您可以直接从您的设计中查找/生成 Microblaze 驱动程序的 API 文档。例如。在 Xilinx Platform Studio 中，右键单击 Microblaze 核心应该会显示菜单项 Driver/View API Documentation。从那里您可以导航到 xgpio 驱动程序，对于 XGpio_SetDataDirection 您应该看到如下内容:

void XGpio_SetDataDirection (XGpio *      InstancePtr,
                             unsigned     Channel,
                             u32          DirectionMask
                            )     

Set the input/output direction of all discrete signals for the specified GPIO channel.

Parameters:

• InstancePtr is a pointer to an XGpio instance to be worked on.
• Channel contains the channel of the GPIO (1 or 2) to operate on.
• DirectionMask is a bitmask specifying which discretes are input and which are output. Bits set to 0 are output and bits set to 1 are input.

Returns: None.

Note: The hardware must be built for dual channels if this function is used with any channel other than 1. If it is not, this function will assert.

因此，在您的情况下，XGpio_SetDataDirection (&gp_out, 1, 0x00) 会将 GPIO 端口(带有 LED)设置为 Microblaze CPU 内核的输出。