Institutional Repository | Satya Wacana Christian University: Pesawat Telepon pada Jaringan Wired Local Area Network (LAN) Menggunakan Protokol TCP/IP

(1)

94 void spi_eth_reset()

{

SPI_CS_ON; spi(0xFF); SPI_CS_OFF; }

void spi_set_bank(char value) {

char data;

SPI_CS_ON;

spi(SPI_READ_CON_CMD|ECON1); data=(spi(0)&0xFC)|value; SPI_CS_OFF;

SPI_CS_ON;

spi(SPI_WRITE_CON_CMD|ECON1); spi(data);

SPI_CS_OFF; }

char spi_read_con_e(char bank,char add) {

char data;

char cmd=SPI_READ_CON_CMD|add; spi_set_bank(bank);

SPI_CS_ON; spi(cmd); data=spi(0); SPI_CS_OFF; return data; }

char spi_read_con_m(char bank,char add) {

char data;

char cmd=SPI_READ_CON_CMD|add; spi_set_bank(bank);

(2)

void spi_write_con(char bank,char add,char value) {

char cmd=SPI_WRITE_CON_CMD|add; spi_set_bank(bank);

SPI_CS_ON; spi(cmd); spi(value); SPI_CS_OFF; }

int spi_read_phy(char add) {

char temp;int data;

spi_write_con(BANK_2,MIREGADR,add); temp=spi_read_con_m(BANK_2,MICMD)|0x01; spi_write_con(BANK_2,MICMD,temp);

while((spi_read_con_m(BANK_3,MISTAT)&0x01)==0x01){}; temp=spi_read_con_m(BANK_2,MICMD)&0xFE;

spi_write_con(BANK_2,MICMD,temp); data=spi_read_con_m(BANK_2,MIRDH)<<8; data=data|spi_read_con_m(BANK_2,MIRDL); return data;

}

void spi_write_phy(char add,int data) {

char temp;

spi_write_con(BANK_2,MIREGADR,add); temp=data&0x00FF;

spi_write_con(BANK_2,MIWRL,temp); temp=(data&0xFF00)>>8;

spi_write_con(BANK_2,MIWRH,temp); delay_ms(1);

}

void spi_transmit_start() {

char temp=0;

temp=spi_read_con_e(BANK_0,EIR)&0xF7;

spi_write_con(BANK_0,EIR,temp); //Clear Transmit Flag temp=spi_read_con_e(BANK_0,ECON1)|0x08;

spi_write_con(BANK_0,ECON1,temp); //Set Transmit Enable }

void spi_wait_transmit_done() {

while(spi_read_con_e(BANK_0,ECON1)&0x08==0x08); }

char spi_check_transmit_stat() {

(3)

char spi_transmit_error_cause() {

char temp=0,error=0xFF;

temp=spi_read_con_e(BANK_0,ESTAT);

if((temp&0x40)==0x40)error=6; //Buffer error else if((temp&0x10)==0x10)error=4; //Collision error else if((temp&0x04)==0x04)error=2; //Receive Busy else if((temp&0x02)==0x02)error=1; //Transmit abort else if((temp&0x01)==0x01)error=0; //OST expired return error;

}

void spi_receive_start() {

char temp=0;

temp=spi_read_con_e(BANK_0,ECON1)|0x04; spi_write_con(BANK_0,ECON1,temp); }

void spi_receive_stop() {

char temp=0;

temp=spi_read_con_e(BANK_0,ECON1)&0xFB; spi_write_con(BANK_0,ECON1,temp); }

char spi_check_packet() {

if(spi_read_con_e(BANK_1,EPKTCNT)>0)return 1; else return 0;

}

void spi_wait_clk_ready() {

while((spi_read_con_e(BANK_0,ESTAT)&0x01)==0) {

delay_ms(50); }

}

void spi_wait_rx_busy() {

(4)

LAMPIRAN B. Perhitungan Matematis Low Pass Filter

Filter Chebyshev dengan passband ripple sebesar 3dB memiliki koefisien sebagai

berikut :

a

1 5,6334

a

2 0,7620

b

2 2,6530

a

3

0,1172

b

3

1,0686

Untuk bagian orde 1 perhitungan frekuensi cut-off adalah sebagai berikut :

2

5,6334

2 . 12. 10 . 22. 10

5,6334. 10

2 . 264

,

Untuk bagian orde 2 dengan R1 = 1K8, R2 = 15K, C1= 100n dan C2 = 2n2 adalah

sebagai berikut :

! "

! 4#

4

0,762. 10

%

! " 0,762. 10

%

! 4.2,653. 10

%

. 2,2. 10

4 . 1,8. 10 . 10

%

. 2,2. 10

0,762. 10

%

! "0,5806. 10

'

! 23,3464. 10

15,84 . 10

0,762. 10

%

! "34,7136. 10

15,84 . 10

0,762. 10

%

! 5,8918. 10

)

15,84 . 10

1,7282. 10

)

15,84 . 10

*+, * ,-

. "

! 4#

4

0,762. 10

%

. " 0,762. 10

%

! 4.2,653. 10

%

. 2,2. 10

4 . 15. 10 . 10

%

. 2,2. 10

0,762. 10

%

. "0,5806. 10

'

! 23,3464. 10

132 . 10

0,762. 10

%

. "34,7136. 10

132 . 10

0,762. 10

%

. 5,8918. 10

)

132 . 10

13,5118. 10

)

(5)

Untuk bagian orde 2 dengan R

1

= 470, R

2

= 5K, C

1

= 1u dan C

2

= 1n adalah sebagai

berikut :

! "

! 4#

4

0,1172. 10 ! " 0,1172. 10

! 4.1,0686. 10 . 10

4 . 470. 10 . 10

0,1172. 10 ! "0,0137. 10

! 4,2744. 10

0

188 . 10

'

0,1172. 10 ! "9,4256. 10

0

188 . 10

'

0,1172. 10 ! 9,7085. 10

)

188 . 10

'

2,0115. 10

)

188 . 10

'

,/, *

. "

! 4#

4

0,1172. 10 . " 0,1172. 10

! 4.1,0686. 10 . 10

4 . 5. 10 . 10 . 10

0,1172. 10 . "0,0137. 10

! 4,2744. 10

0

2 . 10

0,1172. 10 . "9,4256. 10

0

2 . 10

0,1172. 10 . 9,7085. 10

)

2 . 10

21,4285. 10

)