C6748 GPIO程序

如下图所示，调试例程里的GPIO程序，109端口对应开发板上的第二个led灯，请问如果要控制另一个灯，怎么找到这个灯的端口号？

noaming：

查看开发板的硬件原理图，或者硬件手册，另外一个灯与那个pin相连。

noaming：

再看看GPIODirModeSet这个函数的定义

FAN LI9：

回复 noaming:

查看手册，已知led4是GPIO bank6 pin12的，它的pin number 是109，而led3是GPIO bank6 pin13 的，怎么知道它的pin number呢？

noaming：

回复 FAN LI9:

“led4是GPIO bank6 pin12的，它的pin number 是109”

对于这个pin number肯定会有定义的地方，看看手册说明或者该函数处的定义

FAN LI9：

回复 FAN LI9:

现在如果要定义GPIO bank6 pin13，以下的语句怎么修改，后面的两个数字修改可以参考什么呢

noaming：

回复 FAN LI9:

这个地方的寄存器配置，可以参考的地方是技术手册247页

noaming：

回复 FAN LI9:

TMS320C6748 DSPTechnical Reference Manual

http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=spruh79&fileType=pdf

Tony Tang：

回复 FAN LI9:

看一下gpio.c里的函数说明和代码实现，就是一个bank 32个GPIO，从低bank往高排的。

/** * \brief This function gets the direction of a pin which has been configured * as an input or an output pin. * * \param baseAdd The memory address of the GPIO instance being used. * \param pinNumber The serial number of the GPIO pin. * The 144 GPIO pins have serial numbers from 1 to 144. * * \return This returns one of the following two values: * 1> GPIO_DIR_INPUT, if the pin is configured as an input pin. * 2> GPIO_DIR_OUTPUT, if the pin is configured as an output pin.

unsigned int GPIODirModeGet(unsigned int baseAdd, unsigned int pinNumber){ unsigned int dir = GPIO_DIR_INPUT; unsigned int regNumber = 0; unsigned int pinOffset = 0; /* ** Each register contains settings for each pin of two banks. The 32 bits ** represent 16 pins each from the banks. Thus the register number must be ** calculated based on 32 pins boundary. */ regNumber = (pinNumber – 1)/32; /* ** In every register the least significant bits starts with a GPIO number on ** a boundary of 32. Thus the pin offset must be calculated based on 32 ** pins boundary. Ex: 'pinNumber' of 1 corresponds to bit 0 in ** 'register_name01'. */ pinOffset = (pinNumber – 1) % 32;

dir = (HWREG(baseAdd + GPIO_DIR(regNumber)) & (1 << pinOffset));

return (dir >> pinOffset);

user4179546：

回复 FAN LI9:

I think you can get your answer by referring topage 848 in TMR. Table 19-1 may give you a little help.