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Discussion Groups | 68HC12 | Problem with SPI bus in XIRQ interrupt
Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).
Problem with SPI bus in XIRQ interrupt - ymliao - Mar 4 11:09:35 2009
Hi!
I use MC9S12E128 micro in my application, and XIRQ interrupt to handle power fail.
In the XIRQ interrupt, I need to save data to memory via the SPI bus. And I notice that sometimes the SPI bus is not working properly:
1) data appears on the bus is not what's being sent by the micro
2) SPI bus clock becomes scrunched up (before power fails, there is some idle time between each group of eight clock ticks when reading/writing a bunch of data on the bus, but after power fails, SPI clock appears one after another, no more idle time)
Has anyone seen this before? Any help is greatly appreciated!
Thanks!
Amy
------------------------------------
(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )
I use MC9S12E128 micro in my application, and XIRQ interrupt to handle power fail.
In the XIRQ interrupt, I need to save data to memory via the SPI bus. And I notice that sometimes the SPI bus is not working properly:
1) data appears on the bus is not what's being sent by the micro
2) SPI bus clock becomes scrunched up (before power fails, there is some idle time between each group of eight clock ticks when reading/writing a bunch of data on the bus, but after power fails, SPI clock appears one after another, no more idle time)
Has anyone seen this before? Any help is greatly appreciated!
Thanks!
Amy
------------------------------------
(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )