TMS320F28335: Possible Incorrect Operation of XINTF Module After Power Up
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Failure Description:TMS320F28335would be hang-up occasionally if accessing to XINTF memory, when Hollysys teststhe third version PCBA. This issue can be found from sprz272k.pdf.
Revision(s) Affected:0, A
Details:TheXINTF module may not get reset properly upon power up. When this happens,
accesses to XINTFaddresses may cause the CPU to hang. This issue occurs only upon
power up. It does nothappen for other resets such as a reset initiated by the watchdog
or an external (warm) reset using the XRS pin.
Workaround:Aftercoming out of reset, software should force a watchdog (WD) reset if WDFLAG = 0 inthe WDCR register. WDFLAG = 0 implies that an external reset occurred, forexample, a power-on reset. After exiting the WD reset, WDFLAG will be 1. Inthis case, software should clear the WDFLAG bit before continuing normal codeexecution. This issue affects only the XINTF module.
Reference code:
EALLOW;
if(!(SysCtrlRegs.WDCR &0x0080)) // if there is a watchdog reset
{
SysCtrlRegs.WDCR = 0x00A8; // enable watchdog
SysCtrlRegs.WDCR = 0x0000; // reset
}
SysCtrlRegs.WDCR = 0x00E8;//disable watchdog
EDIS;
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