Hello,
I met some trouble with the 16550A driver provided in Xenomai 2.3.1
and my Moxa cards (PCI / 8 * RS232 / 168U ).
It was a problem of baudrate computation before setting the LCR_DLAB
register.
The formula implemented by the Xenomai driver is different from the one
provided by Moxa. So I copy/paste the formula from the mxser.c file
(present in the
kernel distro), and it seems to work fine.
I think it's Moxa card dependant, may be caused by the high default baud
rate of this card.
I post here my patch below, it may interest someone.
David
----------------------------------------------
@@ -29,7 +29,7 @@
#define IN_BUFFER_SIZE 4096
#define OUT_BUFFER_SIZE 4096
-#define DEFAULT_BAUD_BASE 115200
+#define DEFAULT_BAUD_BASE 921600
#define DEFAULT_TX_FIFO 16
#define PARITY_MASK 0x03
@@ -316,8 +316,23 @@
if (testbits(config->config_mask, RTSER_SET_BAUD)) {
ctx->config.baud_rate = config->baud_rate;
- baud_div = (baud_base[dev_id] + (ctx->config.baud_rate >> 1)) /
- ctx->config.baud_rate;
+ if (ctx->config.baud_rate == 134)
+ {
+ baud_div = (2 * baud_base[dev_id] / 269);
+ }
+ else
+ {
+ if (ctx->config.baud_rate)
+ {
+ baud_div = baud_base[dev_id] / ctx->config.baud_rate;
+ if (baud_div == 0)
+ baud_div = 1;
+ }
+ else
+ {
+ baud_div = 0;
+ }
+ }
outb(LCR_DLAB, LCR(dev_id));
outb(baud_div & 0xff, DLL(dev_id));
outb(baud_div >> 8, DLM(dev_id));
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