Software routines

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5

Software routines

This section of the application note describe each function contained in the firmware. A

general description and flow diagram are provided for each routine.

5.1

Initialization routine

The two routines are used for initialization. The ASM_init routine is used to initialize the

global variables, which is done using the _stext routine, the auto startup routine. After this

routine the init routine is called which initializes different bool variables, portA register, ADC

bits and SPI.

Figure 15. Initialization routine

5.2

Main routine

The main routine is called after ASM_init (_stext), which called different functions.

Init routine

Initialize 18-bool variables;

Initialize portA;

Call a delay routine to wait for 5V supply to reach to 5V;

Initialize ADC: Amp not selected, calibration OFF, slow bit = 0

Initialize SPI: software slave is used, SPI freq = Fcpu/4, SPI inter-

rupt enabled, read from memory array

ASM_init

Initialize global variables