Hallo,
PIC 18F2580, MPLAP, C18
Habe folgendes Problem. Der Pic wird im Slave Modus betrieben. Der Pin 7
(SS) wird über einen 74HC85 und einen 74HC132 gesteuert. Der Pic
verarbeitet aber das Signal an Pin 7 nicht. Dieser verarbeitet den
Datenstrom auch, wenn am Pin ein High Signal anliegt. Senden und
empfangen ist in Ordnung.
Hier meine Code
// INIT SETUP
//
// bit 76543210
PORTA = 0b00000000; // Clear PORTA
PORTB = 0b00000000; // Clear PORTB
PORTC = 0b00000000; // Clear PORTC
//
// bit 76543210
LATA = 0b00000000; // Clear LATA
LATB = 0b00000100; // Clear LATB
LATC = 0b00000000; // Clear LATC
//
// bit 76543210
TRISA = 0b00110000; // PORTA inputs - outputs.
TRISB = 0b00000000; // PORTB inputs - outputs.
TRISC = 0b00011001; // PORTC inputs - outputs.
und INIT SPI
//
// ---->>>> .....
INTCONbits.GIE = 0; // bit 7 GIE/GIEH: Global Interrupt Enable
bit
// When IPEN (RCON<7>) = 0:
// 1 = Enables all unmasked interrupts
// 0 = Disables all interrupts
// When IPEN (RCON<7>) = 1:
// 1 = Enables all high priority interrupts
// 0 = Disables all priority interrupts
//
// ---->>>> .....
ADCON1 = 0x07;
// bit 3-0 PCFG3:PCFG0: A/D Port Configuration Control bits
// PCFG AN7 AN6 AN5 AN4 AN3 AN2 AN1 AN0 VREF+ VREF- C/R
// 011x D D D D D D D D — — 0/0
//
// ---->>>> .....
INTCON2bits.RBPU = 1; // bit 7 RBPU: PORTB Pull-up Enable bit
// 1 = All PORTB pull-ups are disabled
// 0 = PORTB pull-ups are enabled by individual
port latch values
//
// ---->>>> .....
INTCON3 = 0; // INTCON3: INTERRUPT CONTROL REGISTER 3
// disable unused unterrupts
//
// ---->>>> .....
PIE2 = 0x00; // PIE2: PERIPHERAL INTERRUPT ENABLE REGISTER 2
// disable unused interrupts
//
// ---->>>> .....
RCONbits.IPEN = 0; // bit 7 IPEN: Interrupt Priority Enable bit
// 1 = Enable priority levels on interrupts
// 0 = Disable priority levels on interrupts (PIC16CXXX Compatibility
mode)
//
// ---->>>> .....
TRISCbits.TRISC3 = 1; // for SLAVE SPI the clock pin needs to be an
input
TRISAbits.TRISA5 = 1; // it seems both for MASTER and SLAVE this pin
// needs to be an input
//
// ---->>>> .....
PIE1 = 0x08; // PIE1: PERIPHERAL INTERRUPT ENABLE
REGISTER 1
// enable only SPI interrupts
//
// ---->>>> .....
SSPSTAT = 0x00; // sample bit slave configuration, transmit
// idle to active clock state
//
// ---->>>> .....
// bit 76543210
SSPCON1 = 0b00000100; // bit 3-0 Synchronous Serial Port Mode Select
bits
// 0101 = SPI Slave mode, clock = SCK pin, SS pin
// control disabled, SS can be used as I/O
pin
// 0100 = SPI Slave mode, clock = SCK pin, SS pin
// control enabled
// 0011 = SPI Master mode, clock = TMR2
// output/2
// 0010 = SPI Master mode, clock = FOSC/64
// 0001 = SPI Master mode, clock = FOSC/16
//
// ---->>>> .....
while (PORTCbits.RC3 != SSPCON1bits.SSPEN);
// as section 17.3.6 at page 149 indicates, before enabling
// SPI slave mode
// program must wait for idel mode position (make sure same
// idel mode
//
// ---->>>> .....
SSPCON1bits.SSPEN = 1; // bit 5 SSPEN: Synchronous Serial Port
Enable
// bit
// 1 = Enables serial port and configures
// SCK, SDO, SDI and SS as serial port
pins
// 0 = Disables serial port and configures
// these pins as I/O port Pins
//
//
// ---->>>> .....
RCONbits.IPEN = 0; // bit 7 IPEN: Interrupt Priority Enable bit
// 1 = Enable priority levels on interrupts
// 0 = Disable priority levels on interrupts
// (PIC16CXXX Compatibility mode)
//
// ---->>>> .....
INTCONbits.PEIE = 1; // bit 6 PEIE/GIEL: Peripheral Interrupt
Enable
// bit
// When IPEN (RCON<7>) = 0:
// 1 = Enables all unmasked peripheral
interrupts
//
// ---->>>> .....
INTCONbits.GIE = 1; // bit 7 GIE/GIEH: Global Interrupt Enable
bit
// When IPEN (RCON<7>) = 0:
// 1 = Enables all unmasked interrupts
// 0 = Disables all interrupts
// When IPEN (RCON<7>) = 1:
// 1 = Enables all high priority interrupts
// 0 = Disables all priority interrupts
Gruß Siegfried
