embedded - I2C with Atmega168 -


i'm trying control several servos using adafruit pwm servo controller. uses i2c interface communicate micro controller. https://www.adafruit.com/product/815

i'm using atmega 168 attempt send i2c instructions micro controller using simple i2c library.

#include "i2c.h"  void initi2c(void) {   twbr = 32;                               /* set bit rate, see p. 242 */                                      /* 8mhz / (16+2*twbr*1) ~= 100khz */   twcr |= (1 << twen);                                       /* enable */ }  void i2cwaitforcomplete(void) {   loop_until_bit_is_set(twcr, twint); }  void i2cstart(void) {   twcr = (_bv(twint) | _bv(twen) | _bv(twsta));   i2cwaitforcomplete(); }  void i2cstop(void) {   twcr = (_bv(twint) | _bv(twen) | _bv(twsto)); }  uint8_t i2creadack(void) {   twcr = (_bv(twint) | _bv(twen) | _bv(twea));   i2cwaitforcomplete();   return (twdr); }  uint8_t i2creadnoack(void) {   twcr = (_bv(twint) | _bv(twen));   i2cwaitforcomplete();   return (twdr); }  void i2csend(uint16_t data) {   twdr = data;   twcr = (_bv(twint) | _bv(twen));                  /* init , enable */   i2cwaitforcomplete(); }

i found addresses of servo controller arduino driver i'm having issues setting pwm of board. here code i'm attempting use:

#include <avr/io.h> #include <util/delay.h> #include <avr/interrupt.h> #include "i2c.h"  #define servo_min 1000 #define servo_max 2000 #define servo_mid 1500  #define pca9685_addr 0x4  #define pca9685_mode1 0x0  #define led0_on_l 0x6 #define led0_on_h 0x7 #define led0_off_l 0x8 #define led0_off_h 0x9  int main(void) {   initi2c();   setupcontroller();   for(int = 1; < 17; i++) {     setservo(i, 0, 4026);   }   return 0; }  void setupcontroller() {     i2cstart();     i2csend(pca9685_addr);     i2csend(pca9685_mode1);     i2csend(0x0);     i2cstop(); }  void setservo(uint8_t id, uint16_t start, uint16_t stop) {     i2cstart();     i2csend(pca9685_addr);     i2csend(led0_on_l+4*id);     i2csend(start);     i2csend(start>>8);     i2csend(stop);     i2csend(stop>>8);     i2cstop(); }

here driver: https://github.com/adafruit/adafruit-pwm-servo-driver-library

i'm pretty sure i2c isn't set correctly? suggestions?

thank you! :)


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom
Read more