Try using #define GPIO *((volatile unsigned long *)0x44e...) On Sunday, May 5, 2013 4:47:00 AM UTC+5:30, ky...@cranehome.info wrote: > > If been able to find a couple of libraries that deal with GPIO on the > BeagleBone. I have tried to compile and execute them on the BeagleBone > Black but have had no success thus far. One library is a C library and > tries to set the MUX via the now missing omap_mux file and fails at that > point. It's mimicking the Arduino style DigitalWrite syntax. The other > one is a C++ library that appears to try to access the MUX settings through > memory as well. > > Both Libraries seem to have a base address for the GPIO pins as*:* > > *#define GPIO0 (0x44E07000)#define GPIO1 (0x4804C000)#define GPIO2 > (0x481AC000)#define GPIO3 (0x481AE000)* > > The control register base seems to be set as this: > const unsigned long Beagle_GPIO::GPIO_Control_Module_Registers = > 0x44E10000; > > > This is the C++ library I found. > https://github.com/majestik666/Beagle_GPIO/blob/master/Beagle_GPIO.cc > > and was able to compile it but had to add: > #include <unistd.h> > to the Beagle_GPIO.hh to cover the use of usleep in several places before > it succeeds in building. Running the test executable however results in: > > root@beaglebone:~/downloads/Beagle_GPIO-master# ./Beagle_GPIO_test > [GPIO] : Beagle_GPIO::Beagle_GPIO() > [GPIO] : Opening /dev/mem > [GPIO] : Beagle GPIO Initialized > [GPIO] : ==================== > [GPIO] : BeagleBone GPIO Test > [GPIO] : ==================== > [GPIO] : Configuring Pin P8_46 as Output > Bus error > > So the error suggests that something about the addressing is not right. > Has the BBB new processor changed the memory map locations around? > > I'm just searching for a way that allows me to use the GPIO pins in a > straight-forward way. I have several C/C++ programs I have been using on > the RaspberryPi and wanted to port over to the BeagleBone Black but they > need to have access to the GPIO pins. At present I have no option it seems > to move forward with this since file operations on exported pins is not > going to cut it for my needs. >
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