DAC.rar_C8051F410 DAC_c8051f410

//----------------------------------------------------------------------------- // F41x_DACs_SineCosine.c //----------------------------------------------------------------------------- // Copyright 2006 Silicon Laboratories, Inc. // http://www.silabs.com // // Program Description: // // This program outputs sine and cosine waveforms using the hardware DACs // on the C8051F410 microcontroller. The waveforms are output on pins // P0.0/IDA0 and P0.1/IDA1. // // The output of the DACs is updated upon a Timer3 interrupt. The Timer3 ISR // then calculates the output of the DACs for the next interrupt. // // The frequency of the output waveforms is set by the #define <FREQUENCY>. // // // How To Test: // // 1) Download the code to an C8051F410 Development Board // 2) Check that the J6 and J16 shorting blocks are not installed. This // ensures that the IDAC outputs are not connected to any other pins // 3) Check that the J13 and J14 short blocks are installed. This connects // the DAC outputs to resistors so that the output current is converted // to a voltage // 4) Connect two oscillscope probes to pins P0.0/IDA0 and P0.1/IDA1. // These pins are available on both the J2 and J11 headers. // 5) Confirm that there are two waveforms with the output of DAC1 leading // the output DAC0 by 90 degrees. The frequency of both waveforms should // be close to frequency defined by <FREQUENCY> // // FID: 41X000036 // Target: C8051F41x // Tool chain: Raisonance / Keil // Command Line: None // // Release 1.1 / 11 MAR 2010 (GP) // -Tested with Raisonance // // Release 1.0 // -Initial Revision (GP) // -09 AUG 2006 // //----------------------------------------------------------------------------- // Includes //----------------------------------------------------------------------------- #include <compiler_defs.h> #include <C8051F410_defs.h> // SFR declarations //----------------------------------------------------------------------------- // Global Constants //----------------------------------------------------------------------------- #define SYSCLK 24500000 // Internal oscillator frequency in Hz #define SAMPLE_RATE_DAC 100000L // DAC sampling rate in Hz #define PHASE_PRECISION 65536 // range of phase accumulator #define FREQUENCY 1000 // Frequency of output waveform in Hz // <PHASE_ADD> is the change in phase between DAC samples; It is used in // the set_DACs routine. unsigned int PHASE_ADD = FREQUENCY * PHASE_PRECISION / SAMPLE_RATE_DAC; int code SINE_TABLE[256] = { 0x0000, 0x0324, 0x0647, 0x096a, 0x0c8b, 0x0fab, 0x12c8, 0x15e2, 0x18f8, 0x1c0b, 0x1f19, 0x2223, 0x2528, 0x2826, 0x2b1f, 0x2e11, 0x30fb, 0x33de, 0x36ba, 0x398c, 0x3c56, 0x3f17, 0x41ce, 0x447a, 0x471c, 0x49b4, 0x4c3f, 0x4ebf, 0x5133, 0x539b, 0x55f5, 0x5842, 0x5a82, 0x5cb4, 0x5ed7, 0x60ec, 0x62f2, 0x64e8, 0x66cf, 0x68a6, 0x6a6d, 0x6c24, 0x6dca, 0x6f5f, 0x70e2, 0x7255, 0x73b5, 0x7504, 0x7641, 0x776c, 0x7884, 0x798a, 0x7a7d, 0x7b5d, 0x7c29, 0x7ce3, 0x7d8a, 0x7e1d, 0x7e9d, 0x7f09, 0x7f62, 0x7fa7, 0x7fd8, 0x7ff6, 0x7fff, 0x7ff6, 0x7fd8, 0x7fa7, 0x7f62, 0x7f09, 0x7e9d, 0x7e1d, 0x7d8a, 0x7ce3, 0x7c29, 0x7b5d, 0x7a7d, 0x798a, 0x7884, 0x776c, 0x7641, 0x7504, 0x73b5, 0x7255, 0x70e2, 0x6f5f, 0x6dca, 0x6c24, 0x6a6d, 0x68a6, 0x66cf, 0x64e8, 0x62f2, 0x60ec, 0x5ed7, 0x5cb4, 0x5a82, 0x5842, 0x55f5, 0x539b, 0x5133, 0x4ebf, 0x4c3f, 0x49b4, 0x471c, 0x447a, 0x41ce, 0x3f17, 0x3c56, 0x398c, 0x36ba, 0x33de, 0x30fb, 0x2e11, 0x2b1f, 0x2826, 0x2528, 0x2223, 0x1f19, 0x1c0b, 0x18f8, 0x15e2, 0x12c8, 0x0fab, 0x0c8b, 0x096a, 0x0647, 0x0324, 0x0000, 0xfcdc, 0xf9b9, 0xf696, 0xf375, 0xf055, 0xed38, 0xea1e, 0xe708, 0xe3f5, 0xe0e7, 0xdddd, 0xdad8, 0xd7da, 0xd4e1, 0xd1ef, 0xcf05, 0xcc22, 0xc946, 0xc674, 0xc3aa, 0xc0e9, 0xbe32, 0xbb86, 0xb8e4, 0xb64c, 0xb3c1, 0xb141, 0xaecd, 0xac65, 0xaa0b, 0xa7be, 0xa57e, 0xa34c, 0xa129, 0x9f14, 0x9d0e, 0x9b18, 0x9931, 0x975a, 0x9593, 0x93dc, 0x9236, 0x90a1, 0x8f1e, 0x8dab, 0x8c4b, 0x8afc, 0x89bf, 0x8894, 0x877c, 0x8676, 0x8583, 0x84a3, 0x83d7, 0x831d, 0x8276, 0x81e3, 0x8163, 0x80f7, 0x809e, 0x8059, 0x8028, 0x800a, 0x8000, 0x800a, 0x8028, 0x8059, 0x809e, 0x80f7, 0x8163, 0x81e3, 0x8276, 0x831d, 0x83d7, 0x84a3, 0x8583, 0x8676, 0x877c, 0x8894, 0x89bf, 0x8afc, 0x8c4b, 0x8dab, 0x8f1e, 0x90a1, 0x9236, 0x93dc, 0x9593, 0x975a, 0x9931, 0x9b18, 0x9d0e, 0x9f14, 0xa129, 0xa34c, 0xa57e, 0xa7be, 0xaa0b, 0xac65, 0xaecd, 0xb141, 0xb3c1, 0xb64c, 0xb8e4, 0xbb86, 0xbe32, 0xc0e9, 0xc3aa, 0xc674, 0xc946, 0xcc22, 0xcf05, 0xd1ef, 0xd4e1, 0xd7da, 0xdad8, 0xdddd, 0xe0e7, 0xe3f5, 0xe708, 0xea1e, 0xed38, 0xf055, 0xf375, 0xf696, 0xf9b9, 0xfcdc, }; //----------------------------------------------------------------------------- // Function Prototypes //----------------------------------------------------------------------------- void main(void); void OSCILLATOR_Init (void); void PORT_Init (void); void DAC0_Init (void); void DAC1_Init (void); void TIMER3_Init (int counts); void Set_DACs (void); //----------------------------------------------------------------------------- // MAIN Routine //----------------------------------------------------------------------------- void main (void) { PCA0MD &= ~0x40; // Disable Watchdog timer OSCILLATOR_Init (); // Initialize oscillator PORT_Init (); // Initialize crossbar and ports DAC0_Init (); // Initialize DAC0 DAC1_Init (); // Initialize DAC1 TIMER3_Init(SYSCLK/SAMPLE_RATE_DAC);// Initialize Timer3 to overflow at // <SAMPLE_RATE_DAC> times per second EA = 1; // Enable global interrupts while(1) {} // Wait for interrupt } //----------------------------------------------------------------------------- // Interrupt Service Routines //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // TIMER3_ISR //----------------------------------------------------------------------------- // // This ISR is called on Timer3 overflows. Timer3 is set to auto-reload mode // and is used to schedule the DAC output sample rate in this example. // Note that the values written to the DACs during this ISR call are // actually transferred to the DACs at the next Timer3 overflow. // //----------------------------------------------------------------------------- void TIMER3_ISR (void) interrupt 14 { TMR3CN &= ~0x80; // Clear Timer3 overflow flag Set_DACs(); } //----------------------------------------------------------------------------- // Initialization Routines //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // OSCILLATOR_Init //----------------------------------------------------------------------------- // // Return Value : None // Parameters : None // // This routine initializes the system clock to use the internal 24.5MHz // oscillator as its clock source. Also enables missing clock detector reset. // //----------------------------------------------------------------------------- void OSCILLATOR_Init (void) { OSCICN = 0x87; // Set clock to 24.5 MHz RSTSRC = 0x04; // Enable missing clock detector } //----------------------------------------------------------------------------- // PORT_Init //----------------------------------------------------------------------------- // // Return Value : None // Parameters