karlgauss
Joined: 23 Jul 2006
Posts: 1
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| TRF2.4 (Nordic NRF2401) Driver |
 Posted: Sun Jul 30, 2006 9:30 pm |
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Hi there, some useful code for the TRF2.4, cheers
Carlos Romero
Electronic Eng.
| Code: |
////////////////////////////////////////////////////////////////////////////////
// Laipac RF-24G / TXRX24G
// 2.4GHz Wireless Transceiver Driver
//
// Original by carlos_rom
//
// Filename : RF-24G.c
// Programmer : Carlos Rom
// Version : Version 1 - 21/07/2006
//
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//Pin Configuration
//
// Pin Name Pin(uC) Description
// 1 GND Power Gound (0V)
// 2 CE Output Chip Enable activates RX or TX mode
// 4 CS Output Chip Select activates Configuration mode
// 5 CLK1 I/O Clock Input(TX)&I/O(RX) for data channel 1 3-wire interface
// 6 DATA I/O RX data channel 1/TX data input /3-wire interface
// 7 DR1 Input RX data ready at data channel 1 (ShockBurst only)
// 10 VCC Power Power Supply (+3V DC)
#define RF_24G_CE PIN_B2
#define RF_24G_CS PIN_B1
#define RF_24G_DATA PIN_C0
#define RF_24G_CLK1 PIN_C1
#define RF_24G_DR1 PIN_B0 //interrupt driven
#define num_bytes 2
#define num_byte_conf 15
#define address_width 2 //numero de BYTES en la direcci�n
#define CLKDELAY delay_us(1);
#define CSDELAY delay_us(20);
#define PWUPDELAY delay_ms(4);;
//extern int8 buffer_rx[num_bytes];
//extern int8 buffer_tx[num_bytes];
//extern int8 configuracion_rx[num_byte_conf];
//extern int8 configuracion_tx[num_byte_conf];
//extern int8 address_rx[address_width];
int8 buffer_rx[num_bytes];
int8 buffer_tx[num_bytes]={0x0F,0xF3};
int8 address_rx[address_width]={0x01,0xE7};
int8 configuracion_rx[num_byte_conf]={0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0xE8, 0x00, 0x00, 0x00, 0x01, 0xE7, 0x43, 0x4F, 0x17}; //RX con 1 al final
int8 configuracion_tx[num_byte_conf]={0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0xE8, 0x00, 0x00, 0x00, 0x01, 0xE7, 0x43, 0x4F, 0x16}; //6F = 250k 4F=1MBPS
//palabra de control con 2 bytes de direcci�n 0x01,0xE7, con CRC 16, 16 MHz Xtal, RF CH 80, 0dBm, 1Mbps
void OUT_BYTE(int8 b)
{
int8 j;
int8 p = 7;
for(j = 0 ; j < 8 ; j++) //One bit at a time
{
if( BIT_TEST(b,p--) )
{
OUTPUT_HIGH(RF_24G_DATA);
}
else
{
OUTPUT_LOW(RF_24G_DATA);
}
CLKDELAY;
OUTPUT_HIGH(RF_24G_CLK1);
CLKDELAY;
OUTPUT_LOW(RF_24G_CLK1);
OUTPUT_FLOAT(RF_24G_DATA);
OUTPUT_FLOAT(RF_24G_CLK1);
}
}
void receive_data(void)
{
int8 i=0, j=0, temp=0, temp2=0;
set_tris_c(0b00000101);
//TRF_control_port=TRF_control_port&TRF_standby; //ponerlo inactivo
//CSDELAY;
//Erase the current data array so that we know we are looking at actual received data
for(i = 0 ; i < num_bytes ; i++) //4 int8s
{ buffer_rx[i] = 0x00; }
//Clock in data, el tama�o del paquete sera de 1int8*num_bytes
for(i = 0 ; i < num_bytes ; i++)
{
for(j = 0 ; j < 8 ; j++) //8 bits each comenzando por el MSB
{
OUTPUT_HIGH(RF_24G_CLK1);
//CLKDELAY;
if (INPUT(RF_24G_DATA))
{temp2=0x01;}
else
{temp2=0x00;}
OUTPUT_LOW(RF_24G_CLK1);
//CLKDELAY;
temp <<= 1;
temp = temp|temp2;
}
buffer_rx[i] = temp; //Store this int8
}
if(INPUT(RF_24G_DR1)==0) //Once the data is clocked completely, the receiver should make DR go low
{ //hay un bit corrido hacia la izquierda
if (buffer_rx[1]==0xF3) //se esta recibiendo el primer int8 2 veces
{
output_toggle(PIN_A0);
}
else { output_low(PIN_A0); }
}
else
{ output_low(PIN_A0); }
// {ERROR_FLAG=1;}
set_tris_c(0b00000111);
OUTPUT_HIGH(RF_24G_CE);
OUTPUT_LOW(RF_24G_CS);
OUTPUT_FLOAT(RF_24G_CLK1);
OUTPUT_FLOAT(RF_24G_DATA);
CSDELAY;
}
void transmit_data(void)
{
int8 i, j, temp=0,temp2=0, rf_address;
set_tris_c(0b00000111);
OUTPUT_HIGH(RF_24G_CE);
OUTPUT_LOW(RF_24G_CS);
CSDELAY;
set_tris_c(0b00000100);
for(j = 0 ; j < address_width ; j++) //comenzando por el MSB
{
rf_address=address_rx[j];
OUT_BYTE(rf_address);
}
//Clock in the buffer_tx
for(i = 0 ; i < num_bytes ; i++)
{
temp = buffer_tx[i];
OUT_BYTE(temp);
}
OUTPUT_LOW(RF_24G_CE);
OUTPUT_LOW(RF_24G_CS);
set_tris_c(0b00000111);
output_toggle(PIN_A0);
}
void configure_receiver(void)
{
int8 i=0, j=0, temp=0, temp2=0;
enable_interrupts(INT_EXT);
enable_interrupts(GLOBAL);
OUTPUT_LOW(RF_24G_CE);
OUTPUT_LOW(RF_24G_CS);
CSDELAY;
OUTPUT_LOW(RF_24G_DATA); OUTPUT_LOW(RF_24G_CLK1);
PWUPDELAY;
OUTPUT_LOW(RF_24G_CE);
OUTPUT_HIGH(RF_24G_CS);
CSDELAY;
set_tris_c(0b00000100);
//Clock in the buffer_tx
for(i = 0 ; i < num_byte_conf ; i++)
{
temp = configuracion_rx[i];
OUT_BYTE(temp);
}
OUTPUT_HIGH(RF_24G_CE);
OUTPUT_LOW(RF_24G_CS);
set_tris_c(0b00000111);
OUTPUT_LOW(RF_24G_CLK1);
OUTPUT_FLOAT(RF_24G_CLK1);
}
void configure_transmitter(void)
{
int8 i, j, temp,temp2;
OUTPUT_LOW(RF_24G_CE);
OUTPUT_HIGH(RF_24G_CS);
set_tris_c(0b00000100);
PWUPDELAY;
//Clock in the buffer_tx
for(i = 0 ; i < num_byte_conf ; i++)
{
temp = configuracion_tx[i];
OUT_BYTE(temp);
}
OUTPUT_LOW(RF_24G_CE);
OUTPUT_LOW(RF_24G_CS);
set_tris_c(0b00000111);
OUTPUT_LOW(RF_24G_CLK1);
OUTPUT_FLOAT(RF_24G_CLK1);
}
|
you can have more speed with fixed_io ports, but its straightforward
for usage just for example (remember thar this code is using rb0 interrupt, that, you can change also easily
| Code: |
if(INPUT(PIN_A1)) { configure_transmitter();}
else {configure_receiver();}
while(1) {
if(INPUT(PIN_A1)) {
delay_ms(100);
transmit_data();
}
}
}
#INT_EXT
ext2_handler() //llega a la interrupci�n con un flanco de subida en RB0/INT0 es decir en SDI
{
receive_data();
}
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Last edited by karlgauss on Fri Jun 19, 2009 4:46 am; edited 1 time in total |
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