LFern
Joined: 16 Mar 2011
Posts: 19
Location: Melbourne, Australia
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| Explorer 16 SPI EEPROM Code for PIC24FJ64GA004 PIM |
 Posted: Sun May 29, 2011 11:27 pm |
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Further to the post: http://www.ccsinfo.com/forum/viewtopic.php?t=45014
Hi All,
I have tested the below code which is working on Explorer 16 board PIC24FJ64GA004 PIM with explorer 16 built in SPI EEPROM 24LC256.
Best regards,
Lasith.
Save code as eeprom.c and driver as Driver_SPI_25LCxxx.c.
You need to include driver file in to the "Other Files" on MPLAB project.
You can see the output message through a terminal emulator connected to Explorer 16 serial out with baud 38400, 8N1, no handshaking.
Output message:
Write data:4 to address:5
Read address:5 expecting data:4, received: 4
Sample Source:
| Code: |
//--- eeprom test code ---
#include <24FJ64GA004.h>
#include <string.h>
#include <Driver_SPI_25LCxxx.c>
#fuses NOWDT
#use delay(internal=8Mhz)
//SPI EEPROM
#pin_select SCK1OUT = PIN_C8
#pin_select SDI1 = PIN_C4
#pin_select SDO1 = PIN_C5
//UART
#pin_select U2TX = PIN_C9
#pin_select U2RX = PIN_C3
#use rs232(uart2, baud=38400)
void main()
{
int16 SPI_Temp;
init_ext_eeprom();
printf("\n\r\n\r");
printf("Write data:4 to address:5");
write_ext_eeprom(5, 4);
SPI_Temp = read_ext_eeprom(5);
printf("\n\r");
printf("Read address:5 expecting data:4, received:%d", SPI_Temp);
while(1);
}
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| Code: |
// FILE NAME: Driver_SPI_25LCxxx.c
//---EEPROM 24LC256 DEVICE---
#define EEPROM_SELECT PIN_A8
#define EEPROM_ADDRESS long int
#define EEPROM_SIZE 32768
void init_ext_eeprom()
{
output_high(EEPROM_SELECT);
setup_spi(SPI_MASTER | SPI_XMIT_L_TO_H | SPI_CLK_DIV_4 );
}
//--------------------------------
int1 ext_eeprom_ready(void)
{
int8 data;
output_low(EEPROM_SELECT);
spi_write(0x05);
data = spi_read(0);
output_high(EEPROM_SELECT);
return(!bit_test(data, 0));
}
//--------------------------------
void write_ext_eeprom(EEPROM_ADDRESS address, BYTE data)
{
while(!ext_eeprom_ready());
output_low(EEPROM_SELECT);
spi_write(0x06);
output_high(EEPROM_SELECT);
output_low(EEPROM_SELECT);
spi_write(0x02);
spi_write(address >> 8);
spi_write(address);
spi_write(data);
output_high(EEPROM_SELECT);
}
//--------------------------------
BYTE read_ext_eeprom(EEPROM_ADDRESS address)
{
int8 data;
while(!ext_eeprom_ready());
output_low(EEPROM_SELECT);
spi_write(0x03);
spi_write(address >> 8);
spi_write(address);
data = spi_read(0);
output_high(EEPROM_SELECT);
return(data);
}
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