一个驱动函数的用途

ZHANGXUEJIE

一个驱动函数的用途 [复制链接]

最近看ZLG 的CAN例程，里面有个GPIOPinconfigure()函数，但是我看了GPIO的驱动函数库，没有发现有这样一个函数。请问这个函数在哪里有说明文档。

Study_Stellaris

你的驱动库可能比较旧，下载新的 Stellarisware 里边有。
这个函数主要是配置管脚复用的。

shower.xu

最新库的gpio.c文件里

//***************************************************************************** // //! Configures the alternate function of a GPIO pin. //! //! \param ulPinConfig is the pin configuration value, specified as only one of //! the \b GPIO_P??_??? values. //! //! This function configures the pin mux that selects the peripheral function //! associated with a particular GPIO pin. Only one peripheral function at a //! time can be associated with a GPIO pin, and each peripheral function should //! only be associated with a single GPIO pin at a time (despite the fact that //! many of them can be associated with more than one GPIO pin). //! //! The available mappings are supplied on a per-device basis in //! pin_map.h. The \b PART_IS_ define will enable the //! appropriate set of defines for the device that is being used. //! //! \note This function is not valid on Sandstorm, Fury, and Dustdevil-class //! devices. //! //! \return None. // //***************************************************************************** void GPIOPinConfigure(unsigned long ulPinConfig) { unsigned long ulBase, ulShift; // // Check the argument. // ASSERT(((ulPinConfig >> 16) & 0xff) < 15); ASSERT(((ulPinConfig >> 8) & 0xe3) == 0); // // Extract the base address index from the input value. // ulBase = (ulPinConfig >> 16) & 0xff; // // Get the base address of the GPIO module, selecting either the APB or the // AHB aperture as appropriate. // if(HWREG(SYSCTL_GPIOHBCTL) & (1 << ulBase)) { ulBase = g_pulGPIOBaseAddrs[(ulBase << 1) + 1]; } else { ulBase = g_pulGPIOBaseAddrs[ulBase << 1]; } // // Extract the shift from the input value. // ulShift = (ulPinConfig >> 8) & 0xff; // // Write the requested pin muxing value for this GPIO pin. // HWREG(ulBase + GPIO_O_PCTL) = ((HWREG(ulBase + GPIO_O_PCTL) & ~(0xf << ulShift)) | ((ulPinConfig & 0xf) << ulShift)); }

ZHANGXUEJIE

谢谢各位！