Hello:
I am just new in RTLINUX.
I am trying to implement a system reading dato from the /dev/ttyS0, and I
would like to use the IRQ facility.
I am using also the rt_com module in order to set, read and write from and
to the serial port.
Everything seems to be OK.
First I typed from the command line
setserial /dev/ttyS0 uart none
then insmod rt_com.o
The real problems is that the the rtl_hard_enable_irq (4) it not working
as I supossed. The corresponding handler only works the first time, even
when the rtl_hard_enable_irq (4) is present at the end of the
corresponding function.
A simplified version of the program is
.
.
.
.
unsigned int intr_handler (unsigned int irq, struct pt_regs *regs)
{
char buffer;
rt_com_read (COM1,&buffer,1);
rtf_put (FIFO1,&buffer,1);
rtl_hard_enable_irq (4);
return 0;
}
int init_module (void)
{
rtf_create (FIFO1,FIFO1_SIZE);
rt_com_setup (0,9600,RT_COM_PARITY_NONE,1,8);
rtl_request_irq (4, intr_handler);
rtl_hard_enable_irq (4);
return 0;
}
void cleanup_module (void)
{
rtl_hard_disable_irq (4);
rtl_free_irq (4);
rt_com_setup (0,-1,0,0,0);
rtf_destroy (FIFO1);
return 0;
}
I would be very pleased if somebody can help me with this
Thanks in advance
Manuel.
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