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hello_world_small.c
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hello_world_small.c
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#include <stdio.h>
#include <string.h>
#define CHARLIM 256 // Maximum character length of what the user places in memory. Increase to allow longer sequences
#define QUITLETTER '~' // Letter to kill all processing
#include "system.h"
#include "altera_up_avalon_accelerometer_spi.h"
#include "altera_avalon_timer_regs.h"
#include "altera_avalon_timer.h"
#include "altera_avalon_pio_regs.h"
#include "sys/alt_irq.h"
#include <stdlib.h>
#include "alt_types.h"
#include "sys/times.h"
#define OFFSET -32
#define PWM_PERIOD 16
alt_8 pwm = 0;
alt_u8 led;
int level;
void print_text(char *text, const int length) {
char *printMsg;
asprintf(&printMsg, "<--> Detected %d characters: %s <--> \n %c", length, text, 0x4); // Print out the strings
alt_putstr(printMsg);
free(printMsg);
memset(text, 0, 2*CHARLIM); // Empty the text buffer for next input
}
char generate_text(char curr, int *length, char *text, int *running) {
if(curr == '\n') return curr; // If the line is empty, return nothing.
int idx = 0; // Keep track of how many characters have been sent down for later printing
char newCurr = curr;
while (newCurr != EOF && newCurr != '\n'){ // Keep reading characters until we get to the end of the line
if (newCurr == QUITLETTER) { *running = 0; } // If quitting letter is encountered, setting running to 0
text[idx] = newCurr; // Add the next letter to the text buffer
idx++; // Keep track of the number of characters read
newCurr = alt_getchar(); // Get the next character
}
*length = idx;
return newCurr;
}
int read_chars() {
char text[2*CHARLIM]; // The buffer for the printing text
char prevLetter = '!';
int length = 0;
int running = 1;
while (running) { // Keep running until QUITLETTER is encountered
prevLetter = alt_getchar(); // Extract the first character (and create a hold until one arrives)
prevLetter = generate_text(prevLetter, &length, text, &running); // Process input text
//print_text(text, length); // Print input text
return prevLetter;
}
}
void led_write(alt_u8 led_pattern) {
IOWR(LED_BASE, 0, led_pattern);
}
void convert_read(alt_32 acc_read, int * level, alt_u8 * led) {
acc_read += OFFSET;
alt_u8 val = (acc_read >> 6) & 0x07;
* led = (8 >> val) | (8 << (8 - val));
* level = (acc_read >> 1) & 0x1f;
}
void sys_timer_isr() {
IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER_BASE, 0);
if (pwm < abs(level)) {
if (level < 0) {
led_write(led << 1);
} else {
led_write(led >> 1);
}
} else {
led_write(led);
}
if (pwm > PWM_PERIOD) {
pwm = 0;
} else {
pwm++;
}
}
void timer_init(void * isr) {
IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER_BASE, 0x0003);
IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER_BASE, 0);
IOWR_ALTERA_AVALON_TIMER_PERIODL(TIMER_BASE, 0x0900);
IOWR_ALTERA_AVALON_TIMER_PERIODH(TIMER_BASE, 0x0000);
alt_irq_register(TIMER_IRQ, 0, isr);
IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER_BASE, 0x0007);
}
float FIR(float x_read, float* x, float* coef, int len){
float y = 0.0;
for (int i = (len-1) ; i > 0 ; i--){
x[i] = x[i-1];
y = y + (coef[i] * x[i]);
}
x[0] = x_read;
y = y + (coef[0] * x[0]);
return y;
}
int main() {
alt_32 x_read;
alt_32 y;
alt_32 cmd;
alt_up_accelerometer_spi_dev * acc_dev;
acc_dev = alt_up_accelerometer_spi_open_dev("/dev/accelerometer_spi");
if (acc_dev == NULL) { // if return 1, check if the spi ip name is "accelerometer_spi"
return 1;
}
timer_init(sys_timer_isr);
cmd = alt_getchar();
while (1){
if(cmd=='n'){
alt_up_accelerometer_spi_read_x_axis(acc_dev, & x_read);
alt_printf("raw data: %x\n", x_read);
convert_read(x_read, & level, & led);
}
if(cmd=='f') {
// alt_up_accelerometer_spi_read_x_axis(acc_dev, & x_read);
// alt_printf("filtered data: %x\n", x_read);
// convert_read(x_read, & level, & led);
// float coef[5] = {5,5,5,5,5};
// float x[5]; /* or any other initial condition*/
// y = FIR(x_read, x, coef, 5);
IOWR(LED_BASE, 0, 2);
}
}
}