Users Guide: Network Microcontroller Supplement User Manual

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High-Speed Microcontroller User’s

Guide: Network Microcontroller

Supplement

209

rom_task_switch_out

The rom_task_switch_out function is called before a task is suspended (either voluntarily because it waits for an event or because its

timeslice is over). The DS80C400 silicon software implementation of this function saves the task’s state (stack and SFRs) to the state

buffer. This function is exported by the DS80C400 silicon software, and also serves as the default taskswitchout in the function redi-

rect table. Note: It returns ACC ! = 0. The rom_task_switch_in function returns to the caller of this function with ACC = 0. The para-

meters passed to rom_task_switch_in are defined as follows.

1-WIRE MASTER

OWM_First

The OWM_First function searches for the first 1-Wire device on the network and, if found, places the 8-byte unique ROM ID in the

OWM_ROMID buffer. A pointer to the OWM_ROMID buffer is provided in the ROM export table.

OWM_Next

The OWM_Next function searches for the next 1-Wir

e device on the network based upon the last known search ROM discrepancy and,

if found, places the 8-byte unique ROM ID in the OWM_ROMID buffer. A pointer to the OWM_ROMID buffer is provided in the ROM

export table.

OWM_Reset

The OWM_Reset function perfor

ms a 1-Wire reset on the network and returns device pr

esence and line-short conditions.

OWM_Byte

The OWM_Byte function performs eight 1-Wir

e bit timeslots on the network and returns the response.

OWM_ROMID

OWM_ROMID is a memory buffer wher

e 8-byte address (unique ROM ID) is stored after successful OWM_First or OWM_Next func

tion call. A pointer to the OWM_ROMID buffer is provided in the ROM export table. The 8-byte returned address is stor

ed as follows:

@OWM_ROMID+0: Family Code

@OWM_ROMID+1: LSByte of 6-byte serial number

@OWM_ROMID+2: LSByte+1 of 6-byte serial number

@OWM_ROMID+3: LSByte+2 of 6-byte serial number

@OWM_ROMID+4:

LSByte+3 of 6-byte serial number

@OWM_ROMID+5: LSByte+4 of 6-byte serial number

@OWM_ROMID+6: MSByte of 6-byte serial number

@OWM_ROMID+7: CRC