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为啥我的cc2538 的指令周期时间那么长?

Other Parts Discussed in Thread: CC2538, CC2538-SW

 我用的晶振是32M的,现在想用GPIO 模拟SPI总线,但是发现速度最高也就是1M多 !

GPIOPinWrite(BSP_FLASH_CS_BASE, BSP_FLASH_CS, 1);

GPIOPinWrite(BSP_FLASH_CS_BASE, BSP_FLASH_CS, 0);

这两条语句就占用了GPIO 的翻转操作就占用了800ns  的时间,

一条  i++; 语句竟然用100ns 

请问这样正常吗