Aren't ports automatically set to required state by apropriate statement, when needed?
Anyways, found another code that worked:
Code:
' Program 25LC640.BAS
' *************************************************************
' * For use with EXPERIMENTING WITH THE PICBASIC PRO COMPILER *
' * *
' * This source code may be freely used within your own *
' * programs. However, if it is used for profitable reasons, *
' * please give credit where credit is due. *
' * And make a reference to myself or Rosetta Technologies *
' * *
' * Les. Johnson *
' *************************************************************
'
' Write to the first 11 locations of a MICROCHIP 25LC640 SPI serial eeprom
' Then Read the 11 locations back and display them on a serial LCD
' The configuration is 8192 words x 8-bits
' To WRITE to the eeprom:-
' The 16-bit address is loaded into the variable "ADDR"
' The byte to write is loaded into the variable "E_BYTEOUT"
' And a call is made to the subroutine "EWRITE"
' To READ from the eeprom:-
' The 16-bit address is loaded into the variable "ADDR"
' And a call is made to the subroutine "EREAD"
' The byte at the specified address is returned in the variable "E_BYTEIN"
Include "Modedefs.Bas"
' ** Setup the Crystal Frequency, in Mhz **
Define OSC 4 ' Set Xtal Frequency
' ** Set Debug Defines **
Define DEBUG_REG PortA ' Debug PORT ?
Define DEBUG_BIT 0 ' *** Debug pin Bit ? ***
Define DEBUG_BAUD 9600 ' *** Debug Baud Rate ***
Define DEBUG_MODE 1 ' Set Serial Mode 1=Inverted
Define DEBUG_PACING 300 ' Delay 'in uS' between characters sent
' ** Define LCD Constants **
I Con 254 ' Control Byte
Clr Con 1 ' Clear the display
Line1 Con 128 ' Point to beginning of line 1
Line2 Con 192 ' Point to beginning of line 2
Line3 Con 148 ' Point to beginning of line 3
Line4 Con 212 ' Point to beginning of line 4
' ** Define the Pin assignments **
CS Var PortB.0 ' Chip select pin
SCK Var PortB.1 ' Clock pin
SI Var PortB.2 ' Data in pin
SO Var PortB.2 ' Data out pin
' ** Declare the Variables **
Addr var Word ' Memory address within the eeprom (0-511)
E_Byteout Var Byte ' Byte to be placed into the eeprom
E_Bytein Var Byte ' Byte read from the eeprom
' ** Define the eeprom's op-codes **
WRSR Con 1 ' Write to STATUS REGISTER op-code
EWR Con 2 ' WRITE op-code
ERD Con 3 ' READ op-code
WRDI Con 4 ' DISABLE WRITES op-code
RDSR Con 5 ' Read the STATUS REGISTER op-code
EWEN Con 6 ' ENABLE WRITES op-code
' ** THE MAIN PROGRAM STARTS HERE **
' Write the string, "HELLO WORLD" into the first 11 address's of the Eeprom
For Addr=0 To 10 ' Create a loop of 11
Lookup Addr,["H","E","L","L","O"," ","W","O","R","L","D"],E_ByteOut' Build up the string
Gosub EWrite ' Write the byte to the Eeprom
Next ' Close the Loop
' Read the first 11 address's within the Eeprom and display them on the LCD
Again: Debug I,Clr:Pause 30 ' Clear the LCD
Pause 500 ' Pause for drama
For Addr=0 To 10 ' Create a loop of 11
Gosub ERead ' Read the byte from the Eeprom
Debug E_ByteIn ' Display the characters read in from the eeprom
Pause 300 ' Pause between characters being displayed
Next ' Close the loop
Goto Again ' Do it forever
' Read a single byte from the Eeprom
' The address is held in the variable "ADDR"
' The byte read is returned in the variable "E_BYTEIN"
Eread: Low CS ' Enable the eeprom
Shiftout SI,SCK,MSBFIRST,[ERD,Addr.highbyte,Addr.lowbyte]' Send READ COMMAND and address
Shiftin SO,SCK,MSBPRE,[E_Bytein] ' Read data
High CS ' Disable the eeprom
Return
' Write a single byte to the Eeprom
' The address is held in the variable "ADDR"
' The byte to be written is held in the variable "E_BYTEOUT"
Ewrite: Low CS ' Enable the eeprom
Shiftout SI,SCK,MSBFIRST,[EWEN] ' Send WRITE ENABLE command
High CS ' Disable the eeprom, to execute the command
Low CS ' Re-enable the eeprom
Shiftout SI,SCK,MSBFIRST,[EWR,Addr.highbyte,Addr.lowbyte,E_Byteout]' Send address and data
High CS ' Disable the eeprom
Pause 5 ' Allow the eeprom to allocate the byte
Return
LAB1X sample code not working with 25LC640.
Originally Posted by CuriousOne
Bookmarks