I am into a project where I need 2 establish communication between ADuc814(Master) and ADuc841(Slave). Master shud Receive data transmitted by Slave. I am unable to establish the comm. I feel there is no response 4rm slave as though master generates the clock and SS pin is low, slave does not response. Is it necessary that both master and slave should operate in same CLOCK?? For Hardware connection, MOSI, MISO, SCLK and SS pins of Master and Slave are connected. Foll is the code Master Code
#include <ADUC814.H> unsigned char Data[20]; //Store SPI Rx data in Memory void Uart_Tx(unsigned char AsciData); //Serial Tx sbit SS = 0xB5; void main() { char i; PLLCON = 0x00; //Core Clk = 16.6777MHz //////////baud 0f 4800//////// RCAP2H = -1; RCAP2L = 0x92; TH2 = -1; TL2 = 0x92; SCON = 0x50; T2CON = 0x34; ////////////////////////////// CFG814 = 0x01; // Enable P3.5,6,7 for SPI SPICON = 0x37; // Master, CPOH=1,CPOL=0 SS = 0; // Slave Select Enable for(i=0;i<20;i++) { SPIDAT = 0x00; // SPI Clock Generate while(!ISPI); ISPI = 0; Data[i] = (unsigned char)SPIDAT; } /////////Serial Tx SPI Data into UART////////// for(i=0;i<20;i++) { Uart_Tx(Data[i]); Uart_Tx('\n'); } ///////////////////////////////////////////// }
Slave Code, ADuC841
void main() { char i; SPICON = 0x24; // Slave, CPOH=1, CPOL=0 for(i=0;i<20;i++) { SPIDAT = 0x38; /*Transmit Dummy Data, Asci of '8' while(!ISPI); ISPI = 0; } }
Friendzzzz Please Help.........
Oh, I get it ... sorry! Yes. Erik. You are right. Thats what I meant.
The point is to make sure that the data direction is correct.