8mhz可以使用。bsp 是根据12mhz算的。
把crytal 的micro define 改成8mhz用的就好了。
#define __HIRC (12000000UL) =>8000000
/* Set core clock as PLL_CLOCK from PLL */
CLK_SetCoreClock(FREQ_192MHZ);
/* Set both PCLK0 and PCLK1 as HCLK/2 */
CLK->PCLKDIV = CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV2;
/* Enable UART module clock */
CLK_EnableModuleClock(UART0_MODULE);
/* Select UART module clock source as HXT and UART module clock divider as 1 */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HXT, CLK_CLKDIV0_UART0(1));
/* Enable USBH module clock */
CLK_EnableModuleClock(USBH_MODULE);
/* USB Host desired input clock is 48 MHz. Set as PLL divided by 4 (192/4 = 48) */
CLK->CLKDIV0 = (CLK->CLKDIV0 & ~CLK_CLKDIV0_USBDIV_Msk) | CLK_CLKDIV0_USB(4);
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