User's Manual Part 2

SMAC (Simple Media Access Controller)
Wireless Sensing Triple Axis Reference design, Rev. 0.9
Freescale Semiconductor 37
Further changes are relevant to the ZSTAR JW32 platform and specific connections:
drivers.h:
• CLEAR_IRQ_FLAG macro changed to reflect KBI module serving IRQ requests from MC13191.
mcu_hw_config.c:
• void UseExternalClock(void) and void UseMcuClock(void) functions no implemented,
no external clock available to the microcontroller.
• LED toggling added into void MCUInit(void) during waiting for MC13191 to initialize.
• UINT8 IRQPinLow(void) function returns the state of the pin PTA3/KBI3 instead of the IRQ pin.
mcu_hw_config.h:
• IRQFLAG, IRQACK(), IRQInit() and IRQPinEnable() macros changed to reflect KBI
module serving IRQ requests from the MC13191.
device_header.h:
• Several KBI definitions added at the top of the standard <mc68hc908jw32.h> header file.
created port_config_ZSTARJW32.h file with target specific defines (GPIO assignments, etc.)
5.2.2.3 Generic SMAC modifications (USB stick + Sensor Board)
Several modifications of SMAC have been made in order to improve the behavior with some older
MC13191 silicon versions. Namely a software time-out functions (using microcontroller’s TIM/TPM timer
functions) have been added into UINT8 PDDataRequest(tTxPacket *psPacket)and UINT8
PLMEEnergyDetect (void) functions in simple_phy.c file.
Both functions wait for the gu8RTxMode variable to change to IDLE_MODE. This variable should change
in the void interrupt IRQIsr(void) function once the execution of a specified task (in MC13191)
finishes. Under some rare circumstances, an IRQ event (and also an IRQIsr() interrupt) does not occur,
so this software workaround has been implemented to avoid a software lock-up.