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andy09
Joined: 20 Jun 2013
Posts: 2
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| accelerometer LSM303D |
 Posted: Mon May 11, 2015 7:41 pm |
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I need your help, I am working with the accelerometer sensor, but I can read the output channel (X, Y and Z).
I don't know that I do wrong 
This is my code:
| Code: | #INCLUDE <18F4550.h>
#FUSES HSPLL, NOWDT, NOPROTECT, NOLVP, NODEBUG, USBDIV, PLL1, CPUDIV1, VREGEN
#USE delay(clock=48000000)
#include <LSM303D.h>
#define USB_HID_DEVICE FALSE //deshabilitamos el uso de las directivas HID
#define USB_EP1_TX_ENABLE USB_ENABLE_BULK //turn on EP1(EndPoint1) for IN bulk/interrupt transfers
#define USB_EP1_RX_ENABLE USB_ENABLE_BULK //turn on EP1(EndPoint1) for OUT bulk/interrupt transfers
#define USB_EP1_TX_SIZE 3 //size to allocate for the tx endpoint 1 buffer
#define USB_EP1_RX_SIZE 2 //size to allocate for the rx endpoint 1 buffer
#include <pic18_usb.h> //Microchip PIC18Fxx5x Hardware layer for CCS's PIC USB driver
#include <PicUSB.h> //Configuración del USB y los descriptores para este dispositivo
#include <usb.c> //handles usb setup tokens and get descriptor reports
//Asignacion de variables
#define LEDV PIN_D1
#define LEDR PIN_D0
#define LEDP PIN_D2
#define LED_ON output_high
#define LED_OFF output_low
#define DATAXL envia[0]
#define DATAYH envia[1]
int8 recibe[2]; //tamaño de arreglo por recibir
int8 envia[3]; //tamaño de arreglo por enviar
void main(void)
{
set_tris_d(0x00); //Configuracion para el puerto D como salida
output_d(0x00); //Limpiamos el puerto D
set_tris_B(0x0); //Configuracion para el puerto b como salida
output_B(0x00);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
disable_interrupts(GLOBAL); //deshabilitamos todas las interrupciones
LED_OFF(LEDV); //Apagamos led Verde
LED_ON(LEDR); //Encendemos led Rojo
delay_ms(500);
usb_init(); //inicializamos el USB
LED_ON(LEDV); //Apagamos led Verde
LED_OFF(LEDR);
delay_ms(500);
usb_task(); //habilita periferico usb e interrupciones
LED_OFF(LEDV); //Apagamos led Verde
LED_ON(LEDR);
delay_ms(500);
usb_wait_for_enumeration(); //esperamos hasta que el PicUSB sea configurado por el host
LED_ON(LEDV); //Apagamos led Verde
LED_OFF(LEDR);
delay_ms(500);
i2c_init(90000);
delay_ms(100);
//accel_init();
//escribir_dato(acce_W ,0x21, 0x20); //modo normal a 50Hz
//escribir_dato(acce_W ,REG2_A, 0x80); //
while (TRUE)
{
if(usb_enumerated()) //Si el PicUSB está configurado
{
if (usb_kbhit(1)) //Si el endpoint de salida contiene datos del host
{
LED_ON(LEDP); //Apagamos led Verde
delay_ms(500);
DATAXL=read_acc(OUT_X_L_A);
DATAXH=read_acc(OUT_X_H_A);
usb_put_packet(1,envia,3,USB_DTS_TOGGLE); //enviamos el paquete de tamaño 1byte del EP1 al PC
usb_get_packet(1, recibe, 2); //Cachamos el paquete de tamaño 2bytes del EP1 y almacenamos en recibe
LED_OFF(LEDP); //Apagamos led Verde
delay_ms(500);
}
}
}//While
}//main
|
Library;
| Code: | #include <MATH.h>
#use i2c (MASTER, SDA=PIN_B0, SCL=PIN_B1, FORCE_HW) //fast,
//**************** Registros de configuración de acelerometro
#define acce_W 0x3A //dirección de escritura para acelerometro
#define acce_R 0x3B //dirección de lectura para acelerometro
#define TEMP_OUT_L 0x05 //registro de temparatura parte baja
#define TEMP_OUT_H 0x06 //registro de temparatura parte alta
#define WHO_AM_I 0x0F //registro de configuración
#define CTRL0 0x1F //registro de configuración 1
#define REG1_A 0x20 //registro de configuración 1
#define REG2_A 0x21 //registro de configuración 2
#define REG3_A 0X22 //registro de configuración 3
#define REG4_A 0X23 //registro de configuración 4
#define REG5_A 0X24 //registro de configuración 5
#define REG6_A 0X25 //registro de configuración 6
#define REG7_A 0X26 //registro de configuración 6
#define STATUS_A 0x27 //registro de configuración status
//******************* Registros de lectura para IMU acelerometro
#define OUT_X_L_A 0x28
#define OUT_X_H_A 0x29
#define OUT_Y_L_A 0x2A
#define OUT_Y_H_A 0x2B
#define OUT_Z_L_A 0x2C
#define OUT_Z_H_A 0x2D
//******************************************************************************
//**********Función para escribir un dato a los sensores************************
// address + W = dirección del dispositivo+ write
// reg = registro al cual se escribe
// valor = valor que se escribira
void escribir_dato(int direccion,int reg, int valor){
i2c_start(); //Inicia comunicacion
i2c_write(direccion); //Address+W
i2c_write(reg); //Register address (datos para la lectura de las cordenadas x, y)
i2c_write(valor); //Valor a escribir
i2c_stop(); //Fin
}
//******************** funciones manejo de acelerometro*************************
//funcion que inicializa el accelerometro;
void accel_init(){
escribir_dato(acce_W ,CTRL0,0);
escribir_dato(acce_W ,REG1_A,0b01010111); //modo normal a 1600Hz aceleracion en X, Y y Z habilitadas
escribir_dato(acce_W ,REG2_A,0);
escribir_dato(acce_W ,0x2E,0b01000000); //FiFo
//escribir_dato(acce_W ,REG7_A,0b10000000);
//escribir_dato(acce_W ,REG3_A,0);
//escribir_dato(acce_W ,REG4_A,0);
//escribir_dato(acce_W ,REG5_A,0);
//escribir_dato(acce_W ,REG6_A,0);
//escribir_dato(acce_W ,REG7_A,0);
}
int8 read_acc(int8 reg){
int8 dato1;
int St_A;
i2c_start();
i2c_write(acce_W);
i2c_write(reg);
i2c_start();
i2c_write(acce_R);
St_A=i2c_read(0);
i2c_stop();
dato1=St_A;
//dato1=dato1<<8;
return(dato1); //dato leido del acelerometro
} |
I receive the data once, but I can't read another until I reset the system.
I use your code, I can receive something.
Sorry my english is not good.
Thanks in advance. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon May 11, 2015 8:26 pm |
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| Quote: | while (TRUE)
{
if(usb_enumerated()) //Si el PicUSB está configurado
{
if (usb_kbhit(1)) //Si el endpoint de salida contiene datos del host
{
LED_ON(LEDP); //Apagamos led Verde
delay_ms(500);
DATAXL=read_acc(OUT_X_L_A);
DATAXH=read_acc(OUT_X_H_A);
usb_put_packet(1,envia,3,USB_DTS_TOGGLE); //enviamos el paquete de tamaño 1byte del EP1 al PC
usb_get_packet(1, recibe, 2); //Cachamos el paquete de tamaño 2bytes del EP1 y almacenamos en recibe
LED_OFF(LEDP); //Apagamos led Verde
delay_ms(500);
}
}
}//While
}//main
|
Did you look at the USB examples from CCS ? Here is what they say:
c:\program files\picc\examples\ex_usb_hid.c
| Quote: |
//// usb_task() must be called periodically ////
//// in your main loop. If it is not called faster than once ////
//// per millisecond, USB may not work (PIC18 and PIC24 only). //// |
c:\program files\picc\examples\ex_usb_kbmouse.c
| Quote: |
//// usb_task() must be called periodically ////
//// in your main loop. If it is not called faster than once ////
//// per millisecond, USB may not work (PIC18 and PIC24 only). //// |
c:\program files\picc\examples\ex_usb_serial.c
| Quote: | //// usb_task() must be called periodically ////
//// in your main loop. If it is not called faster than once ////
//// per millisecond, USB may not work (PIC18 and PIC24 only). //// |
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temtronic
Joined: 01 Jul 2010
Posts: 9197
Location: Greensville,Ontario
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| Posted: Tue May 12, 2015 6:32 am |
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simple hardware question...
Is the PIC running at 5 volts and the sensor at 3 volts? Nowadays most(all) external peripherals seem to be '3 volt' devices so you have to be careful to properly interface them to a '5 volt' PIC.
jay |
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andy09
Joined: 20 Jun 2013
Posts: 2
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| Posted: Wed May 13, 2015 5:49 pm |
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I did the program and it worked fine, but the sensor did not sent new information when the acceleration change, so I need your help to understand what register I need to let this happen.
I got the sensor from pololu https://www.pololu.com/picture/view/0J4943 |
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