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CC2564: STM32F407 + CC2564初始化失败

Part Number: CC2564

STM32F407 + CC2564初始化失败,提示:BSC_Initialize failed -4,量测RTS为高电平,CTS为低电平,CC2564 32.768khz和26MHZ的晶振都已起振,电压均正常,这种情况硬体电路如何确认没有问题?

如何确认CC2564有没有正常工作?