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Functional Overview
Example Code:
//configure the device to be a master, data transmitted on H-to-L clock transition
setup_spi(SPI_MASTER | SPI_H_TO_L | SPI_CLK_DIV_16);
spi_write(0x80);
value=spi_read();
value=spi_read(0x80);
//write 0x80 to SPI device
//read a value from the SPI device
//write 0x80 to SPI device the same time you are reading a value.
Timer0
These options lets the user configure and use timer0. It is available on all devices and is always
enabled. The clock/counter is 8-bit on pic16s and 8 or 16 bit on pic18s. It counts up and also
provides interrupt on overflow. The options available differ and are listed in the device header
file.
Relevant Functions:
setup_timer_0(mode)
set_timer0(value) or
set_rtcc(value)
value=get_timer0
Relevant Preprocessor:
Relevant Interrupts :
INT_TIMER0 or INT_RTCC
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
TIMER0
Sets the source, prescale etc for timer0
Initializes the timer0 clock/counter. Value may be a 8 bit or 16
bit depending on the device.
Returns the value of the timer0 clock/counter
None
Interrupt fires when timer0 overflows
Returns 1 if the device has timer0
Example Code:
For PIC18F452
setup_timer_0(RTCC_INTERNAL //sets the internal clock as source
|RTCC_DIV_2|RTCC_8_BIT);
set_timer0(0);
//and prescale 2. At 20Mhz timer0
//will increment every 0.4us in this
//setup and overflows every
//102.4us
//this sets timer0 register to 0
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