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SCI to SPI Peripheral Communication in V850ES Microcontrollers

Main( ) then calls Temp_Init( ) to initialize the temperature sensors and the CSI/SPI interface used

to communicate with the sensors. If an error is detected, an error code is displayed and the program

enters an endless loop.

To indicate proper initialization, a pair of dashes is shown in the LED. TM00_Start( ) is called to

start the TM00 timer for a periodic 1 millisecond interrupt, used for debouncing the input switches.

The main( ) program then enters the main program loop. The program checks the state of the SW2

and SW3 switches for the action to perform.

Figure 12. Main( ): Main Program for NEC Electronics CSI to SPI Serial Communication

Yes

SW2 only?

Yes

SW2 only?

Initialize switches and LED displayInitialize switches and LED display

CALL Temp_Init( )CALL Temp_Init( )

Display “- -” in LED display

CALL TM00_Start( ) to debounce

Display “- -” in LED display

CALL TM00_Start( ) to debounce

Get state of SW2 and SW3Get state of SW2 and SW3

temp = Temp_Read_1( )temp = Temp_Read_1( )

CALL Temp_Display(temp)

Wait for switches different

CALL Temp_Display(temp)

Wait for switches different

Temp = Temp_Read_2( )Temp = Temp_Read_2( )

Yes

SW3 only?

Yes

SW3 only?

CALL Temp_Display(temp)

Wait for switches different

CALL Temp_Display(temp)

Wait for switches different

If SW2 is pressed, the MAX6627 temperature sensor is read by calling Temp_Read_1( ), and the

variable temp is set to the value read. The temperature is then displayed in the LED by calling

Temp_Display(temp). Main() then waits for the switch state to be different.

If SW3 is pressed, the DS1722 temperature sensor is ready by calling Temp_Read_2( ), setting

temp to the value read. The temperature is then displayed in the LED by calling

Temp_Display(temp). Main() then waits for the switch state to be different.

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Directed Electronics 3200HS Información técnica Pagina 23