PA8的引脚输出疑问~

只看该作者 · 2021-3-6 23:18

在system_gd32f3x0.c中配置了时钟如下：
#if defined (GD32F350)
//#define __SYSTEM_CLOCK_8M_HXTAL    (__HXTAL)
//#define __SYSTEM_CLOCK_8M_IRC8M    (__IRC8M)
//#define __SYSTEM_CLOCK_72M_PLL_HXTAL    (uint32_t)(72000000)
//#define __SYSTEM_CLOCK_72M_PLL_IRC8M_DIV2 (uint32_t)(72000000)
//#define __SYSTEM_CLOCK_84M_PLL_HXTAL    (uint32_t)(84000000)
//#define __SYSTEM_CLOCK_84M_PLL_IRC8M_DIV2 (uint32_t)(84000000)
//#define __SYSTEM_CLOCK_96M_PLL_HXTAL    (uint32_t)(96000000)
#define __SYSTEM_CLOCK_96M_PLL_IRC8M_DIV2    (uint32_t)(96000000)
//#define __SYSTEM_CLOCK_96M_PLL_IRC48M_DIV2    (uint32_t)(96000000)
//#define __SYSTEM_CLOCK_108M_PLL_HXTAL (uint32_t)(108000000)
//#define __SYSTEM_CLOCK_108M_PLL_IRC8M_DIV2 (uint32_t)(108000000)
#endif /* GD32F350 */

然后在代码里对PA8进行了这样的时钟输出配置：

rcu_ckout_config(RCU_CKOUTSRC_CKPLL_DIV2, 1);
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_8);
gpio_af_set(GPIOA, GPIO_AF_0, GPIO_PIN_8);

想问下，PA8的输出的时钟是多少。。实在看不懂了