Author: jsuijs
Date: Tue Dec 23 01:10:19 2008
New Revision: 640
Modified:
trunk/unvalidated/include/peripheral/usart/serial_hardware.jal
Log:
added validation for max baudrate deviation
Modified: trunk/unvalidated/include/peripheral/usart/serial_hardware.jal
==============================================================================
--- trunk/unvalidated/include/peripheral/usart/serial_hardware.jal
(original)
+++ trunk/unvalidated/include/peripheral/usart/serial_hardware.jal Tue Dec
23 01:10:19 2008
@@ -67,13 +67,24 @@
-- if divider small enough,
-- calculate divider and set high-speed
+ const real_baud = target_clock / 16 / (usart_div + 1)
if usart_div <= 255 then
- if usart_div >= 0 then
+ if (real_baud > serial_hw_baudrate) then
+ if (100 * (real_baud - serial_hw_baudrate) /
serial_hw_baudrate >= max_deviation) then
+ pragma error -- asynchronous baudrate deviation is too
large
+ end if
+ else
+ if (100 * (serial_hw_baudrate - real_baud) /
serial_hw_baudrate >= max_deviation) then
+ pragma error -- asynchronous baudrate deviation is too
large
+ end if
+ end if
+
+ if usart_div >= 0 then
SPBRG = usart_div
else
SPBRG = 0
end if
- TXSTA_BRGH = true
+ TXSTA_BRGH = true
-- try the low-speed mode
else
const usart_div_low = ((((10 * target_clock) / ( 64 *
serial_hw_baudrate )) + 5 ) / 10) - 1
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"jallib" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/jallib?hl=en
-~----------~----~----~----~------~----~------~--~---
