DSP如何实现引脚复用
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2022-06-09 13:03:24
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淘宝:顺丰门窗电器 李 13660205082
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此处以串口配置为例,需要将串口配置为复用1类型,直接在响应的复用寄存器填1。复用2类型,直接在填2。
1.电路原理图 GPIO35、GPIO36
2.Datasheet复用寄存器描述 GPIO35、GPIO36
3.代码示例 GPIO35、GPIO36
//淘宝: 顺丰门窗电器 李 13660205082
EALLOW;
/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.
// This will enable the pullups for the specified pins.
GpioCtrlRegs.GPBPUD.bit.GPIO36 = 0; // Enable pull-up for GPIO36 (SCIRXDA)
GpioCtrlRegs.GPBPUD.bit.GPIO35 = 0; // Enable pull-up for GPIO35 (SCITXDA)
/* Set qualification for selected pins to asynch only */
// Inputs are synchronized to SYSCLKOUT by default.
// This will select asynch (no qualification) for the selected pins.
GpioCtrlRegs.GPBQSEL1.bit.GPIO36 = 3; // Asynch input GPIO28 (SCIRXDA)
/* Configure SCI-A pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be SCI functional pins.
GpioCtrlRegs.GPBMUX1.bit.GPIO36 = 1; // Configure GPIO36 for SCIRXDA operation
GpioCtrlRegs.GPBMUX1.bit.GPIO35 = 1; // Configure GPIO35 for SCITXDA operation
EDIS;