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I need I2C or SPI examples

 
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Antonio Giaretta
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I need I2C or SPI examples
PostPosted: Wed Feb 05, 2003 9:13 am     Reply with quote

I'm trying for some days make a comunication between two pics's, but it don't work. I need same simple example about I2C or/and SPI, that implement a comunication between a PIC 16f873 and 18f452. My compiler version is 3.082

Sorry about the poor english.

Antonio
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Original Post ID: 11301
Neutone



Joined: 08 Sep 2003
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Re: I need I2C or SPI examples
PostPosted: Wed Feb 05, 2003 4:44 pm     Reply with quote

<font face="Courier New" size=-1>:=I'm trying for some days make a comunication between two pics's, but it don't work. I need same simple example about I2C or/and SPI, that implement a comunication between a PIC 16f873 and 18f452. My compiler version is 3.082
:=
:=Sorry about the poor english.
:=
:=Antonio

You can use the SS pin to keep the chips in sync

Wire a master pin to slave SS
Wire the master SCK (out) to slave SCK (in)
Wire the master SDI (in) to slave SDO (out)
Wire the master SDO (out) to slave SDI (in)

On the master

initialize port
setup_spi( spi_master | spi_l_to_h | spi_clk_div_16 );

Set Slave select pin low
output_low(PIN_A0);

Send byte Y /recieve byte X
X1 = spi_read(Y1);
X2 = spi_read(Y2);

Set slave select high
output_high(PIN_A0);

Two bytes were sent two recieved

On the slave

initialize port
setup_spi( spi_slave | spi_l_to_h );

Wait for SS to go low
while ( input(PIN_A5) );

Send byte X /recieve byte Y
Y1 = spi_read(X1);
Y2 = spi_read(X2);

wait for SS to go high
while ( !input(PIN_A5) );

Two bytes were sent two recieved

</font>
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Original Post ID: 11320
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