写个rc522驱动代码
时间: 2023-08-06 07:09:49 浏览: 69
以下是一个简单的 RC522 RFID 模块的 Linux 驱动程序示例:
```c
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/spi/spi.h>
#define RC522_RST_PIN GPIOX // 设置 RC522 的 RST 引脚
#define RC522_SPI_BUS X // 设置 SPI 总线编号
#define RC522_SPI_CS X // 设置 SPI 片选信号编号
static struct spi_device *rc522_spi_device;
static int rc522_reset(void)
{
gpio_set_value(RC522_RST_PIN, 0);
msleep(50);
gpio_set_value(RC522_RST_PIN, 1);
msleep(50);
return 0;
}
static int rc522_spi_write(u8 addr, u8 val)
{
u8 tx_buf[2] = {addr, val};
u8 rx_buf[2] = {0};
struct spi_transfer transfer = {
.tx_buf = tx_buf,
.rx_buf = rx_buf,
.len = sizeof(tx_buf),
};
return spi_sync_transfer(rc522_spi_device, &transfer, 1);
}
static int __init rc522_init(void)
{
struct spi_master *master;
int ret;
ret = gpio_request(RC522_RST_PIN, "rc522_rst");
if (ret) {
pr_err("Failed to request GPIO for RC522 RST\n");
return ret;
}
gpio_direction_output(RC522_RST_PIN, 1);
master = spi_busnum_to_master(RC522_SPI_BUS);
if (!master) {
pr_err("Failed to get SPI master for bus %d\n", RC522_SPI_BUS);
return -ENODEV;
}
rc522_spi_device = spi_new_device(master, NULL);
if (!rc522_spi_device) {
pr_err("Failed to create SPI device\n");
return -ENODEV;
}
rc522_spi_device->chip_select = RC522_SPI_CS;
rc522_spi_device->mode = SPI_MODE_0;
rc522_spi_device->bits_per_word = 8;
rc522_spi_device->max_speed_hz = 5000000;
ret = spi_setup(rc522_spi_device);
if (ret) {
pr_err("Failed to setup SPI device\n");
spi_unregister_device(rc522_spi_device);
return ret;
}
rc522_reset();
// 初始化 RC522 寄存器等设置
// ...
return 0;
}
static void __exit rc522_exit(void)
{
spi_unregister_device(rc522_spi_device);
gpio_free(RC522_RST_PIN);
}
module_init(rc522_init);
module_exit(rc522_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("RC522 RFID Module Driver");
```
请注意,这只是一个简单的示例,实际上,RC522 驱动程序需要更多的功能和错误处理。确保适应您的硬件和系统环境,并根据需要进行修改。
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