我正在尝试让 pic16 控制器运行初始化函数，该函数仅在 LCD 上显示一些文本，然后继续显示其他内容
LCD 输出工作正常，问题是初始化函数一直在执行。我究竟做错了什么 ？
/*
* File: main.c
*
* Created on Sep 1, 2013, 12:09 PM
*/
#include <pic.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include "delay.h"
__CONFIG(WDTE_ON & PWRTE_ON & MCLRE_ON & BOREN_ON & FOSC_INTRCIO );
static int exec_counter = 0;
#define set_bit(ADDRESS,BIT) (ADDRESS |= (1<<BIT)) // bit mask macros
#define clear_bit(ADDRESS,BIT) (ADDRESS &= ~(1<<BIT))
#define flip_bit(ADDRESS,BIT) (ADDRESS ^= (1<<BIT))
#define test_bit(ADDRESS,BIT) (ADDRESS & (1<<BIT))
#define E RC4 // Define the LCD Control Pins
#define RS RC5
int i; // Use Global Variables for Debug
LCDWrite(int LCDData, int RSValue)
{
PORTC = (LCDData >> 4) & 0x0F; // Get High 4 Bits for Output
RS = RSValue;
E = 1; E = 0; // Toggle the High 4 Bits Out
PORTC = LCDData & 0x0F; // Get Low 4 Bits for Output
RS = RSValue;
E = 1; E = 0; // Toggle the Low 4 Bits Out
if ((0 == (LCDData & 0xFC)) && (0 == RSValue))
DelayMs(5);
else
DelayUs(200);
} //
void writeLines(char top[],char bottom[]){
for (i = 0; top[i] != 0; i++) // Write Line 1
LCDWrite(top[i], 1);
LCDWrite(0b11000000, 0); // Move Cursor to the Second Line
for (i = 0; bottom[i] != 0; i++)// Write Line 2
LCDWrite(bottom[i], 1);
}
int countelems(char arr[]){
for (i = 0; arr[i] != 0; i++){}
return i;
}
void pad_number(char number[],char numberout[],char unit[]){
int size_n = countelems(number); // get length of number array by reference
int size_u = countelems(unit); // get length of unit array by reference
int size = size_u + size_n + 1; // calculate total size of text with 1 space between number and unit
int L_space = floor((16-size)/2)-1; // calculate space required on left side of display to center text
for (i = 0; i <= 15; i++)
numberout[i] = 0b10100000; // fill output char array with spaces
for (i = 0; i <= (size_n); i++){
numberout[i+(L_space+1)] = number[i]; // fill output char array with number
}
numberout[L_space+size_n+1] = 0b10100000; // put space in output char array between number and unit
for (i = 0; i <= size_u; i++){
numberout[i+(L_space+size_n+2)] = unit[i]; // fill output char array with unit
}
}
void pad_text(char text[],char textout[]){
int size = countelems(text); // get length of char array by reference
int L_space = floor((16-size)/2); // calculate space required on left side of display to center text
for (i = 0; i <= 15; i++)
textout[i] = 0b10100000; // fill output char array with spaces
for (i = 0; i <= 15; i++){
if( i >= L_space && i <= (L_space+size)){
textout[i] = text[i-L_space]; // fill middle of output char array with text
}
}
}
void getAnalog(int channel,char parameter[], char unit[]){
char output_parameter[16];
char output_number[16];
char number[16];
ADCON0 = channel << 2; // select channel
//set_bit(ADCON0,7); // set ADFM flag so LSB is bit 0 of ADRESL
set_bit(ADCON0,0); // switch ADC on = set ADON flag 0b00000001
sampleTime(); // wait required aquisition time
set_bit(ADCON0,1); // start conversion = set GO/DONE bit
while(test_bit(ADCON0,1)){/* wait for ADC to complete conversion */;}
int ADCresult = (ADRESL+ADRESH)/10; // get result from ADC
itoa(number,ADCresult,10); // convert ADC result to charstring
LCDWrite(0b00000001, 0); // Clear LCD
pad_text(parameter,output_parameter);
pad_number(number,output_number,unit);
writeLines(output_parameter, output_number);
}
void init(){
DelayMs(20); // Wait for LCD to Power Up
PORTC = 3; // Start Initialization Process
E = 1; E = 0; // Send Reset Command
DelayMs(5);
E = 1; E = 0; // Repeat Reset Command
DelayUs(200);
E = 1; E = 0; // Repeat Reset Command Third Time
DelayUs(200);
PORTC = 2; // Initialize LCD 4 Bit Mode
E = 1; E = 0;
DelayUs(200);
LCDWrite(0b00101000, 0); // LCD is 4 Bit I/F, 2 Line
LCDWrite(0b00000001, 0); // Clear LCD
LCDWrite(0b00000110, 0); // Move Cursor After Each Character
LCDWrite(0b00001110, 0); // Turn On LCD and Enable Cursor
// "0123456789012345"
writeLines( " INITIALIZE ",
" TEXT ");
}
void main(void) {
OPTION_REG |= 0x7; // set prescaler to 1:128 or 2.3 Seconds
OPTION_REG |= 0x8; // assign prescaler to WDT
TRISA = 0b00000101; // configure PORTA set RA0 and RA2 to analog input;
ANSEL = 0b00000101; // disable input buffers if I/O pins RA0 and RA2
TRISC = 0; // configure PORTC as output
ADCON1 = 0; // select FOSC2
if (exec_counter == 0){
exec_counter++;
init();
DelayS(4);
}
PORTC = 0;
while (1) {
getAnalog(0,"VELOCITY","KM/H");
DelayS(4);
getAnalog(2,"ACCELERATION","M/S^2");
DelayS(4);
}
return;
}
/*
* File: delay.c
*
* Created on Sep 3, 2013, 12:09 PM
*/
#include "delay.h"
#include <pic.h>
#define _XTAL_FREQ 4000000
void DelayMs(unsigned char cnt)
{
#if XTAL_FREQ <= 2MHZ
do {
DelayUs(996);
} while(--cnt);
#endif
#if XTAL_FREQ > 2MHZ
unsigned char i;
do {
i = 4;
do {
DelayUs(250);
} while(--i);
} while(--cnt);
#endif
}
void DelayS(unsigned int count){
for (int i=0; i<=count;i++){
NOP();
CLRWDT();
DelayMs(1000);
}
}
void sampleTime(){
// TC = – 10pF ( 1k Ω + 7k Ω + 1k Ω ) ln(0.0004885)
// = 0.686 μS
// TACQ = 5μS + 0.686μS + [ ( 50°C- 25°C ) ( 0.05μ S /°C ) ]
// = 6.936 μS /
// 1 instruction cycle = 4μS @ 1 mHz
// 1 instruction cycle = 1μS @ 4 mHz
// 1 instruction cycle = 500nS @ 8 mHz
// 1 instruction cycle = 200nS @ 20 mHz
// TACQ @ 1 mHz is 6.936 μS / 4 μS or ~ 2 instruction cycles
// TACQ @ 4 mHz is 6.936 μS / 1 μS or ~ 7 instruction cycles
// TACQ @ 8 mHz is 6.936 μS / 0.5 μS or ~ 14 instruction cycles
// TACQ @ 20 mHz is 6.936 μS / 0.2 μS or ~ 35 instruction cycles
DelayUs(8);
}