ex2c.c

nordic semiconductor

/*= ex2c.c =====================================================================
 *
 * Written by  Greg Hunter, University of Technology, Sydney, 2007 for sdcc compiler
 * Based in the program ex2c.c by Nordic Semiconductor (author: Ole Saether)
 *
 * This file is distributed in the hope that it will be useful, but WITHOUT
 * WARRANTY OF ANY KIND.
 *
 * Author: Greg Hunter
 *
 * DESCRIPTION:
 *
 *   This program gives an example of using the ADC and PWM together with the
 *   radio. You need two nrf24E1 evaluation boards to test this program. One
 *   board will act as the transmitter and the other as the receiver determined
 *   by the logical level on pin P0.6. Jumper P0.6 to P0.4 for the receiver and
 *   to GND for the transmitter.
 * 
 *   After initializing the ADC and the radio, the transmitter enters an
 *   infinite loop continuously reading the ADC and transmitting the read data.
 *
 *   After initializing the PWM and radio, the receiver enters an infinite loop
 *   continuously waiting for a radio packet and updating the PWM with the data
 *   in the received packet.
 *
 *   Greg Hunter: The program has been modified to use my modules for interfacing
 *   to the radio, spi bus, and a/d converter.
 *
 *   Modules added:
 *   radio.h, radio.c: interface to radio
 *   spi.h, spi.c: interface to spi bus
 *   adc.h, adc.c: interface to a/d converter
 *   delay.h, delay.c: delay generator routines
 *   uart.h, uart.c: UART functions for SDCC by Chin-Shiuh, modified by Greg Hunter
 *     for nRF24E1. Used for debugging
 *
 * COMPILER:
 *  
 *  SDCC compiler for 8051 V2.5.0.
 *
 * $Revision: 0.1
 *
 *==============================================================================
*/
#define INITIALIZE
#include "regs24e1.h"
#include "delay.h"
#include "uart.h"
#include "adc.h"
#include "spi.h"
#include "radio.h"


void InitPWM(void)
{
    P0_ALT |= 0x80;                 // Enable PWM output
    PWMCON = 0xc0;                  // Enable 8 bit PWM with minimum prescaler
}

unsigned char ReceivePacket()
{
    unsigned char b;
    while(RadioRXBuf(ComRXBufPt) == 0) ;
    b = ComParm.pwmData;
    return b;
}

void WritePWM(unsigned char b)
{
    PWMDUTY = b;
}

void Receiver(void)
{
    unsigned char b;
    for(;;)
    {
        b = ReceivePacket();
        WritePWM(b);
    }
}

void Transmitter(void)
{
    unsigned char b;
   ComParm.TXAddress3 = 0x00;   // Set up transmit address
   ComParm.TXAddress2 = 0x00;
   ComParm.TXAddress1 = 0x00;
   ComParm.TXAddress0 = 0x04;
    for(;;)
    {
        b = AdcRead(0) >> 8;              // Read ADC
        ComParm.adcData = b;
        RadioTXBuf(ComTXBufPt,COM_TX_BYTES);  // Transmit data
    }
}

void Init(void)
{
    P0_DIR = 0x40;                  // P0.6 is input, the rest output
    P0 = 0x10;                      // P0.4 = 1 for the rec/tran selection
   RadioInit();
   RadioOn();
   RadioCfg();
}    

void main(void)
{
    uart_init();
    uart_puts("\r\nuart output enabled for debugging");
    Init();
    if(P0 & 0x40)
    {
        InitPWM();
        Receiver();
    }
    else
    {
        AdcInit();
        Transmitter();
    }
}