Hola tengo un pograma en ccs que viene con el pickit2 de microchip, y la verdad no lo entiendo, primeramente no entiendo lo de #fuses y un monton de palabras que no son registros, en un principio fuses pone a set los registros indicados pero no aqui no hay registros. A continuación declara una estructura que tampoco entiendo. Si alguien me lo puede explicar lo agradeceria mucho. cuelgo todo el programa por si a alguien más le puede servir para aprender (también sirve para los 16F87X).
Un saludo,
#include <16F887.h> // header file for the PIC16F887
// includes built-in functions and constants
// for arguments/returns.
#use fast_io(A) // all other ports default to 'standard_io'
#use fast_io(B) // fast_io means the tris bits only change
// when we explicitly set them.
// FUSES sets the PIC16F887 Configuration Words. See top of the header file
// 16F887.h for fuse option constants.
#FUSES INTRC,NOWDT,NOPUT,NOMCLR,NOPROTECT,NOCPD,NOBROWNOUT,NOIESO,NOFCMEN,NOLVP
struct adc_result
{
int8 value; // ADC built-in functions default to 8 bit result.
int1 new_flag; // 1-bit falg to indicate a new (fresh) value
} adc_conversion;
void init_io()
{
// set up PORTA so RA0 is an input for the ADC, RA1-RA7 are outputs
SET_TRIS_A(0x01); // bit 0 = output, 1 = input
// set up PORTB so RB0 is an input for the switch SW1, RB1-RB7 are outputs
SET_TRIS_B(0x01); // bit 0 = output, 1 = input
// set up remaining ports to be all outputs
OUTPUT_C(0x00);
OUTPUT_D(0x00);
OUTPUT_E(0x00);
}
void init_adc()
{
// Set up RA0 as the only analog input, using VDD and VSS
// as the references
SETUP_ADC_PORTS(sAN0 | VSS_VDD);
// Turn on ADC and use Fosc/8 as the conversion clock
// (Fosc = 4MHz)
SETUP_ADC(ADC_CLOCK_DIV_8);
// Set channel for conversion to AN0 (on RA0)
SET_ADC_CHANNEL(0);
// start the first conversion
READ_ADC(ADC_START_ONLY);
}
#INT_RTCC // This function will be called on a Timer0 interrupt
void timer0_interrupt_service()
{
// channel is always set to AN0. Otherwise we might change
// it here
// Get last conversion result.
adc_conversion.value = READ_ADC(ADC_READ_ONLY);
adc_conversion.new_flag = 1; // new value
// start next conversion
READ_ADC(ADC_START_ONLY);
}
void main()
{
int1 led_bar_right = 0; // default is led bar graph starting on the left (DS0)
int switch_count = 0; // used for debouncing the switch
int bars = 0; // used to compute the number of LED "bars" to display
int temp1 = 0; // temporary working variable
int led_display = 0; // led display value
// initialize global variables
adc_conversion.value = 0;
adc_conversion.new_flag = 0;
// Set up MCU
init_io();
init_adc();
// Timer 0 runs off internal clock with 1:256 prescaler
// This means it should run over every ((256*256)/(4MHz/4)) = 65.5ms
// It will be used to start an ADC conversion.
SETUP_TIMER_0(RTCC_INTERNAL | RTCC_DIV_256);
ENABLE_INTERRUPTS(GLOBAL); // enable interrupts in general to be active
ENABLE_INTERRUPTS(INT_RTCC); // enable the interrupt for Timer 0
while(1)
{
// look for a new conversion result
if (adc_conversion.new_flag == 1)
{
bars = adc_conversion.value;
adc_conversion.new_flag = 0; // reset flag
// We'll use the 3 most significant bits of the conversion result
// to determine whether to display 1 to 8 "bars" on the LED display
bars = (bars >> 5) + 1; // add one to make it 1 to 8 (vs 0 to 7)
led_display = 0; // clear display variable
for (temp1 = 0; temp1 < bars; temp1++)
{
// shift in a '1' for each bar
led_display = (led_display << 1) + 1;
}
}
// check for a switch press & debounce
if (INPUT_STATE(PIN_B0) == 0)
{ // switch is low when pressed
if (switch_count < 8)
{ // increment the count on all consecutive checks where switch is pressed
// to a max of 8
switch_count ++;
// if we've seen 8 consecutive checks where the switch is pressed
// it's considered a valid switch press. Reverse the bar graph
if (switch_count == 8)
{
led_bar_right = ~led_bar_right;
}
}
}
else
{ // anytime switch is detected as not pressed, reset the count
switch_count = 0;
}
// update display
if (led_bar_right == 0)
{ // from left
OUTPUT_D(led_display);
}
else
{ // from right
// we have to shift it so it displays 1-8 bars. Just complementing
// would display 0-7.
OUTPUT_D(~(led_display >> 1));
}
}
}
Un saludo,
#include <16F887.h> // header file for the PIC16F887
// includes built-in functions and constants
// for arguments/returns.
#use fast_io(A) // all other ports default to 'standard_io'
#use fast_io(B) // fast_io means the tris bits only change
// when we explicitly set them.
// FUSES sets the PIC16F887 Configuration Words. See top of the header file
// 16F887.h for fuse option constants.
#FUSES INTRC,NOWDT,NOPUT,NOMCLR,NOPROTECT,NOCPD,NOBROWNOUT,NOIESO,NOFCMEN,NOLVP
struct adc_result
{
int8 value; // ADC built-in functions default to 8 bit result.
int1 new_flag; // 1-bit falg to indicate a new (fresh) value
} adc_conversion;
void init_io()
{
// set up PORTA so RA0 is an input for the ADC, RA1-RA7 are outputs
SET_TRIS_A(0x01); // bit 0 = output, 1 = input
// set up PORTB so RB0 is an input for the switch SW1, RB1-RB7 are outputs
SET_TRIS_B(0x01); // bit 0 = output, 1 = input
// set up remaining ports to be all outputs
OUTPUT_C(0x00);
OUTPUT_D(0x00);
OUTPUT_E(0x00);
}
void init_adc()
{
// Set up RA0 as the only analog input, using VDD and VSS
// as the references
SETUP_ADC_PORTS(sAN0 | VSS_VDD);
// Turn on ADC and use Fosc/8 as the conversion clock
// (Fosc = 4MHz)
SETUP_ADC(ADC_CLOCK_DIV_8);
// Set channel for conversion to AN0 (on RA0)
SET_ADC_CHANNEL(0);
// start the first conversion
READ_ADC(ADC_START_ONLY);
}
#INT_RTCC // This function will be called on a Timer0 interrupt
void timer0_interrupt_service()
{
// channel is always set to AN0. Otherwise we might change
// it here
// Get last conversion result.
adc_conversion.value = READ_ADC(ADC_READ_ONLY);
adc_conversion.new_flag = 1; // new value
// start next conversion
READ_ADC(ADC_START_ONLY);
}
void main()
{
int1 led_bar_right = 0; // default is led bar graph starting on the left (DS0)
int switch_count = 0; // used for debouncing the switch
int bars = 0; // used to compute the number of LED "bars" to display
int temp1 = 0; // temporary working variable
int led_display = 0; // led display value
// initialize global variables
adc_conversion.value = 0;
adc_conversion.new_flag = 0;
// Set up MCU
init_io();
init_adc();
// Timer 0 runs off internal clock with 1:256 prescaler
// This means it should run over every ((256*256)/(4MHz/4)) = 65.5ms
// It will be used to start an ADC conversion.
SETUP_TIMER_0(RTCC_INTERNAL | RTCC_DIV_256);
ENABLE_INTERRUPTS(GLOBAL); // enable interrupts in general to be active
ENABLE_INTERRUPTS(INT_RTCC); // enable the interrupt for Timer 0
while(1)
{
// look for a new conversion result
if (adc_conversion.new_flag == 1)
{
bars = adc_conversion.value;
adc_conversion.new_flag = 0; // reset flag
// We'll use the 3 most significant bits of the conversion result
// to determine whether to display 1 to 8 "bars" on the LED display
bars = (bars >> 5) + 1; // add one to make it 1 to 8 (vs 0 to 7)
led_display = 0; // clear display variable
for (temp1 = 0; temp1 < bars; temp1++)
{
// shift in a '1' for each bar
led_display = (led_display << 1) + 1;
}
}
// check for a switch press & debounce
if (INPUT_STATE(PIN_B0) == 0)
{ // switch is low when pressed
if (switch_count < 8)
{ // increment the count on all consecutive checks where switch is pressed
// to a max of 8
switch_count ++;
// if we've seen 8 consecutive checks where the switch is pressed
// it's considered a valid switch press. Reverse the bar graph
if (switch_count == 8)
{
led_bar_right = ~led_bar_right;
}
}
}
else
{ // anytime switch is detected as not pressed, reset the count
switch_count = 0;
}
// update display
if (led_bar_right == 0)
{ // from left
OUTPUT_D(led_display);
}
else
{ // from right
// we have to shift it so it displays 1-8 bars. Just complementing
// would display 0-7.
OUTPUT_D(~(led_display >> 1));
}
}
}
