GPIO按键操作章节代码中的iomux为什么要映射

嵌入式Linux开发
1

struct iomux {
volatile unsigned int unnames[23];
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO00; /* offset 0x5c */
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO01;
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO02;
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03;
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO04;
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO05;
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO06;
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO07;
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO08;
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO09;
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_UART1_TX_DATA;
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_UART1_RX_DATA;
volatile unsigned int IOMUXC_SW_MUX_CTL_PAD_UART1_CTS_B;
};
iomux = ioremap(0x20e0000, sizeof(struct iomux));
6ull pro板子上key1和key2并没有操作gpio1，为什么要映射这个结构体，代码后续也没有操作这些寄存器

2

用不到就无需映射，你删除掉试试