Dear all,
I am a final year student of undergraduation. my project involves setting up of a Wireless sensor network . For this i am using the EZ430-RF2500 kit.
I have been using it now for almost a week and i am facing a few problems regarding the SPI interface, I tried to write my own code to interface msp4302274 and cc2500. i have extensively searched for help in the internet and the e2e community but havent got my problem solved yet. But it would be helpful, if someone could help me with it.
with the following code, i am able to write data into cc2500(i am not sure of that either but am able to see the signals in the oscilloscopeand the values change in the registers window when i debug the code in ccsv4) and i am also getting back some values in the UCSB0RXBUF, but the values were initially 0x0f, which is a valid status signal.... but now it is giving me erratic values. Also i have no success in reading back even a single registers value.
Pls help me.
#include "msp430x22x4.h"
//#include "CC2500.h"
unsigned int data[10];
unsigned int n= 0;
void main(void)
{
volatile unsigned int i = 0;
volatile unsigned int j = 0;
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
P1DIR |= 0x03; // P1.0 output for LED
P2DIR |= 0x00; // P2.6,7 are inputs gdo0,gdo2
P3SEL |= 0x0e; // P3.0,1,2,3 USCI_B0 option select
UCB0CTL0 = 0x29; // Phase = 0, Pulse is inactive low, MSB first, 8-bit, Master mode, 4 pin SPI, SPI sync
UCB0CTL1 = 0x81; // Use SMCLK and stop the USCI
UCB0BR0 = 0x02; // Clock divide low byte
UCB0BR1 = 0x00; // Clock divide high byte
UCB0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
P1OUT = 0x01;//SWITCH ON LED
P3OUT = 0x01; // CSn HIGH
for (i = 0; i < 0xFFFF; i ++); // wait
P3OUT = 0x00; // CSN LOW TO START OPERATION
while (!(IFG2 & UCB0TXIFG)); //Check to see if the send buffer is empty
UCB0TXBUF = 0x30; //send the command -- TO RESET CC2500
while (!(IFG2 & UCB0TXIFG)); //Check to see if the send buffer is empty
P3OUT = 0x01; // CSN HIGH
P3OUT = 0x00; // CSN LOW NEXT CYCLE
while (!(IFG2 & UCB0TXIFG)); //Check to see if the send buffer is empty
UCB0TXBUF = 0x09; //send the command -- TRYING TO write addr register JUST SET
while (!(IFG2 & UCB0TXIFG)); //Check to see if the send buffer is empty
UCB0TXBUF = 0x05; //send the command -- TRYING TO write into addr REGISTER
while (!(IFG2 & UCB0TXIFG)); //Check to see if the send buffer is empty
P3OUT = 0x01; // CSN HIGH
P3OUT = 0x00; // CSN low
while (!(IFG2 & UCB0TXIFG)); //Check to see if the send buffer is empty
UCB0TXBUF = 0x89; //send the command -- TRYING TO READ addr REGISTER JUST SET
while (!(IFG2 & UCB0RXIFG));
data[n++]= UCB0RXBUF;
//while (!(IFG2 & UCB0TXIFG)); //Check to see if the send buffer is empty
//UCB0TXBUF = 0x3d; //send the command snop--- no operation should i use this ppiece of code ??
//while (!(IFG2 & UCB0RXIFG));
//data[n++]= UCB0RXBUF ;
for (i = 0; i < 0xFFFF; i ++); // wait FOR TRANSMISSION TO COMPLETE AND RXBUF TO RECIEVE
P3OUT = 0x01; // CSN HIGH
P1OUT |= 0x00; // Turn LED on
while (1) ; //Stop for review
}
I have also tried modelling reception as interrupts but in still am not able to read register value.Pls tell me whr i am going wrong
Also pls tell me whr i can get some simple sample codes for radio link testing. I went through slaa325.zip, simpliciTI and another packages but they seem to be a littile fussy for a beginner.My project in the end involves implementation of a simple multihop routing protocol. so it would be really helpful if i could get some sample programs for radio link testing.
