ESP32 Forum

Posted: **Tue Oct 25, 2016 2:17 pm**

问题如题，看个例子，
手册中定义的寄存器
IO_MUX_GPIO2_REG Configuration register for pad GPIO2 0x3FF53040
来我们看一下idf中的地址
#define PERIPHS_IO_MUX_GPIO2_U (DR_REG_IO_MUX_BASE +0x40)
#define DR_REG_IO_MUX_BASE 0x3ff49000

PERIPHS_IO_MUX_GPIO2_U =0x3ff49040
我们再来看一下寄存器描述的地址
IO_MUX_x_REG (x: GPIO0-GPIO39) (0x10+4*x)，有了偏移量，你要告诉我基地址吧，从前边的寄存器我默认基地址为0x3ff44000，按照这种算法
IO_MUX_GPIO2_REG =0x3ff44024，也许不是4*2，应该是4*GPIO2，好吧，好吧，求工作人员解答。这。。。。。三种答案让我如何是好，

Posted: **Thu Oct 27, 2016 1:59 am**

Code: Select all

IO_MUX_GPIO36_REG Configuration register for pad GPIO36 0x3FF53004 R/W

Yes it looks like table on p42-43 of technical reference manual lists wrong addresses.

Code: Select all

Register 4.33: IO_MUX_x_REG (x: GPIO0-GPIO39) (0x10+4*x)

Also this register description is confusing since offset is wrong (0x04 - 0x90) and registers are not in numerical gpio order.

Posted: **Thu Oct 27, 2016 9:07 am**

This is fixed in a new revision of the documentation. Up till then, please trust the esp-idf header files wrt addresses.

ESP32 Forum

寄存器地址到底哪个对，求解答

寄存器地址到底哪个对，求解答

Re: 寄存器地址到底哪个对，求解答

Re: 寄存器地址到底哪个对，求解答