Hello! I tried to use the on-board SPI of the Analog Devices ADuC812 but I didn't managed it to work. No Data, no SCLK, the Pins seemed all to be dead at all. Maybe one of you can give me a hint or working sample code. Thanks. Here's some of my code: // Initialize the SPI Interface SPICON = 0x37;// configure SPI port for: 0011,0111 = 0x37 // Fosc/64, CPHA=1, CPOL=0, master IE2 = 0x01; // enable SPI interrupt EA = 1; // enable interrupts ... void send_SPI(unsigned int byte) { SPIDAT = byte; // trigger data transfer }
Hello André, I'm using the ADuC834, but I expect, that the configuration and usage of the SPI is the same as for the ADuC812. Your initialisation seems to be o.k. - just take care, that the clock, polarity and phase settings match the requirements of your slave device. For the following SPI routine, you will not need to enable the interrupt. The routine can be used for sending and reading bytes. To read a byte just send a dummy character.
UI8 SPI_char( const UI8 c ) { ISPI = 0; SPIDAT = c; while( !ISPI ) { ; // do nothing but wait } return( SPIDAT ); }
Hello all, I put your code in my aplication: #include <stdio.h> // declarations for I/O functions #include <ADuC812.h> // 8052 & ADuC812 predefined symbols // Variables globales bit flag_int=0; // Flag de la interrupcion unsigned char dato=0; sbit SS = P3^5; /* SFR for P3.5 */ // Prototipos de funciones void spiTx(unsigned char txDat); // Transmit a byte data over the SPI unsigned char SPI_char( unsigned char c ); //___________________________________________________________________ // INTERRUPT SERVICE ROUTINE void spi_int () interrupt 7 { // ISPI*8+3 = 59dec = 3bhex = ISPI SS= 1; // complement SS (P3.5 on eval bd.) dato=dato+1; } /* END OF INT0 INTERRUPT ROUTINE */ //____________________________________ //___________________________________________________________________ // INTERRUPT SERVICE ROUTINE void int0_int () interrupt 0 { // int0*8+3 = 0dec = 3hex = IE0 flag_int=1; // Flag de detección INT0 externa P3 ^= 0x10; // complement LED (P3.4 on eval bd.) dato=dato+1; } /* END OF INT0 INTERRUPT ROUTINE */ //___________________________________________________________________ // MAIN PROGRAM void main (void) { /* CONFIGURE SPI */ /* SPICON */ SPE = 1; // SPI interface enable SPIM = 1; // SPI master mode operation CPOL = 0; // SPI CLOCK idles High CPHA = 0; // SPI leading SCLOCK edge to transmit data SPR1 = 1; // SPI clock rate SPR1 0 SPR0 0 for Fosc/4 SPR0 = 1; /* CONFIGURACION DE LAS INTERRUPCIONES */ EX0=1; // 1.- Habilitación Interrupcion externa 0 PX0=1; // 2.- Interrupción externa 0 de alta prioridad IT0=1; // 3.- Interrupción externa 0 activa por flanco de bajada IE2=1; // Interrupcion Interrupcion SPI de fin de transmision EA=1; // Se permiten todas las interrupciones anteriormente programadas /* WAIT FOR INTERRUPTS */ while (1) { // while (flag_int) // { // spiTx(dato); // Manda dato por SPI SPI_char(2); // flag_int=0; // Restauro el flag de la interrupcion // } } // endless loop } void spiTx(unsigned char txDat) // Transmit a byte data over the SPI { ISPI = 0; // Clear ISPI bit SS=0; SPIDAT = txDat; while(!ISPI); // Wait until tx complete } unsigned char SPI_char( unsigned char c ) { ISPI = 0; SS=0; SPIDAT = c; while( !ISPI ) { ; // do nothing but wait } return( SPIDAT ); } I able to program clock and togle a port(I saw in osciloscope) but data does not flow thought MOSI line... Can anybody help me?