sames-spi-code.zip_SA9904_sa9904 spi interface_spi interface cod

//http://www.edaboard.com/ftopic303717.html #define CS PORTC.F0 // just an example long read_reg(char adr) { union char_long { long l, char c[4] } result; CS = 1; Spi_Write(1); Spi_Write(adr | 0x80); result.c[2]=Spi_Read(0); result.c[1]=Spi_Read(0); result.c[0]=Spi_Read(0); CS = 0; // sign extension of negative register values if (result.c[2] & 0x80) result.c[3]= 0xff; return result.l; } // CKP = 0, CKE =1, SMP = 0, SSPM = 0010 // MASTER_OSC_DIV16 may also work, depending on clock frequency Spi_Init_Advanced(MASTER_OSC_DIV64, DATA_SAMPLE_MIDDLE, CLK_IDLE_LOW, HIGH_2_LOW); TRISC.F0 = 0; // Init CS output CS = 0;