21ic问答首页 - TAG - 972
-
NUC972配置管脚输出高频时钟CLK_OUT异常
最近学着使用NUC972,使用GPIO可以点亮LED,但是无法输出CLK_OUT,这个是怎么回事?求助void clk_out_config(clk_freq FREQ) { setReg32(REG_CLK_PCLKEN0,getReg32(REG_CLK_PCLKEN0) | (1<<3)); //Enable GPIO engin clock. setReg32(REG_CLK_HCLKEN,getReg32(REG_CLK_HCLKEN) | (1<<5)); //使能PCLK AHB时钟,默认PCLK为75Mhz setReg32(REG_SYS_GPG_MFPH,getReg32(REG_SYS_GPG_MFPH) | (15<<24));//配置为CLK_OUT setReg32(REG_CLK_DIVCTL7,getReg32(REG_CLK_DIVCTL7) | (1<<4));//配置分频因子 GPIO_OpenBit(GPIOG,BIT14, DIR_OUTPUT, NO_PULL_UP);//配置PG4输出 }
3586浏览量 11回复量 关注量