0,0 → 1,135 |
/* mija 2008 |
demo for RFM01 - RX 868MHz |
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PIC 16F876A |
xtal = 4MHz |
*/ |
#include "RX_RFM01.h" |
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//************************************************************************ |
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#define SDI PIN_B0 |
#define SCK PIN_B1 |
#define SDO PIN_B2 // input for PIC |
#define nIRQ PIN_B3 |
#define nSEL PIN_B4 |
#define LED PIN_B5 |
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//************************************************************************ |
unsigned char RF_RXBUF[22]; |
int1 led_trg; |
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//************************************************************************ |
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void RF_INIT(void) |
{ |
output_high(nSEL); |
output_high(SDI); |
output_low(SCK); |
input(SDO); |
} |
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void RF_WRITE_CMD(unsigned int16 cmd) |
{ |
unsigned int8 i; |
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output_low(SCK); |
output_low(nSEL); |
for (i=0;i<16;i++) |
{ |
output_low(SCK); |
if (cmd & 0x8000) output_high(SDI); |
else output_low(SDI); |
output_high(SCK); |
cmd <<= 1; |
} |
output_low(SCK); |
output_high(nSEL); |
} |
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int8 RF_RDFIFO(void) |
{ |
unsigned int8 i,Result; |
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output_low(SCK); |
output_low(nSEL); |
output_low(SDI); |
for (i=0;i<16;i++) // skip satus bits |
{ |
output_high(SCK); |
output_high(SCK); |
output_low(SCK); |
output_low(SCK); |
} |
Result = 0; |
for (i=0;i<8;i++) |
{ |
Result <<= 1; |
if (input(SDO)) Result |= 1; |
output_high(SCK); |
output_high(SCK); |
output_low(SCK); |
output_low(SCK); |
} |
output_high(nSEL); |
return Result; |
} |
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void main() |
{ |
unsigned int8 i,j,ChkSum; |
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setup_adc_ports(NO_ANALOGS); |
setup_adc(ADC_OFF); |
setup_spi(SPI_MASTER|SPI_L_TO_H|SPI_CLK_DIV_4); |
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1); |
setup_timer_1(T1_DISABLED); |
setup_timer_2(T2_DISABLED,0,1); |
setup_comparator(NC_NC_NC_NC); |
setup_vref(FALSE); |
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output_high(LED); |
delay_ms(1000); |
output_low(LED); |
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RF_INIT(); |
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RF_WRITE_CMD(0x0000); |
RF_WRITE_CMD(0x918A); // 868BAND,134kHz |
RF_WRITE_CMD(0xA640); // 876Mhz |
RF_WRITE_CMD(0xC847); // 4.8kbps |
RF_WRITE_CMD(0xC69B); // AFC setting |
RF_WRITE_CMD(0xC42A); // Clock recovery manualcontrol,Dig. filter, DQD=4 |
RF_WRITE_CMD(0xC240); // output 1.66Mhz |
RF_WRITE_CMD(0xC080); |
RF_WRITE_CMD(0xCE88); // use FIFO 8bit |
RF_WRITE_CMD(0xCE8B); |
RF_WRITE_CMD(0xC081); // open RX |
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led_trg = 0; |
i = 0; |
while (1) |
{ |
while (!input(nIRQ)) |
{ |
RF_RXBUF[i++] = RF_RDFIFO(); |
putc(RF_RXBUF[i-1]); |
if (i == 18) |
{ |
i = 0; |
RF_WRITE_CMD(0xCE88); |
RF_WRITE_CMD(0xCE8B); |
ChkSum = 0; |
for (j=0;j<16;j++) ChkSum += RF_RXBUF[j]; |
if (ChkSum == RF_RXBUF[16]) |
{ |
led_trg = ~led_trg; |
output_bit(LED,led_trg); |
} |
} |
} |
} |
} |
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