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UC-7420/7410 User’s Manual Programmer’s Guide
5-4
2. Use the following command on the host to change to the directory that contains hello-debug:
cd /my_work_directory/myfilesystem/testprograms
3. Enter the following command:
#ddd --debugger mxscaleb-gdb hello-debug &
4. Enter the following command at the GDB, DDD command prompt:
Target remote 192.168.4.99:2000
The command produces another line of output on the target console, similar to the following:
Remote debugging using 192.168.4.99:2000
192.168.4.99 is the machine’s IP address, and 2000 is the port number. You can now begin
debugging in the host environment using the interface provided by DDD.
5. Set a breakpoint on main by double clicking, or entering
b main on the command line.
6. Click the cont button
Device API
UC-7420/7410 supports control devices with the ioctl system API. You will need to
include
<moxadevice.h>
, and use the following ioctl function.
int ioctl(int d, int request,…);
Input: int d - open device node return file handle
int request – argument in or out
Use the desktop Linux’s man page for detailed documentation:
#man ioctl
RTC (Real Time Clock)
The device node is located at /dev/rtc. UC-7420/7410 supports Linux standard simple RTC
control. You must
include <linux/rtc.h>
.
1. Function: RTC_RD_TIME
int ioctl(fd, RTC_RD_TIME, struct rtc_time *time);
Description: read time information from RTC. It will return the value on argument 3.
2. Function: RTC_SET_TIME
int ioctl(fd, RTC_SET_TIME, struct rtc_time *time);
Description: set RTC time. Argument 3 will be passed to RTC.
Buzzer
The device node is located at /dev/console. UC-7420/7410 supports Linux standard buzzer control,
with UC-7420/7410’s buzzer running at a fixed frequency of 100 Hz. You must
include
<sys/kd.h>
.
1. Function: KDMKTONE
ioctl(fd, KDMKTONE, unsigned int arg);
Description: The buzzer’s behavior is determined by the argument
arg
. The “high word” part
of arg gives the length of time the buzzer will sound, and the “low word” part gives the
frequency.
The buzzer’s on / off behavior is controlled by software. If you call the “ioctl” function, you
MUST set the frequency at 100 Hz. If you use a different frequency, the system could crash.