STM32控制AD9833示例代码

#include "AD9833.h" #include <math.h> struct spi_class* spi_ad9833; /***************************************************************************//** * @brief Writes the value to a register. * * @param - regValue - The value to write to the register. * * @return None. *******************************************************************************/ void AD9833_SetRegisterValue(unsigned short regValue); /***************************************************************************//** * @brief Initializes the SPI communication peripheral and resets the part. * * @return 1. *******************************************************************************/ unsigned char AD9833_Init(void) { AD9833_SetRegisterValue(AD9833_REG_CMD | AD9833_RESET); return (1); } /***************************************************************************//** * @brief Sets the Reset bit of the AD9833. * * @return None. *******************************************************************************/ void AD9833_Reset(void) { AD9833_SetRegisterValue(AD9833_REG_CMD | AD9833_RESET); } /***************************************************************************//** * @brief Clears the Reset bit of the AD9833. * * @return None. *******************************************************************************/ void AD9833_ClearReset(void) { AD9833_SetRegisterValue(AD9833_REG_CMD); } /***************************************************************************//** * @brief Writes the value to a register. * * @param - regValue - The value to write to the register. * * @return None. *******************************************************************************/ void AD9833_SetRegisterValue(unsigned short regValue) { if(spi_ad9833) { spi_ad9833->spi_set_cs(0); spi_ad9833->spi_write_halfword(spi_ad9833,regValue); spi_ad9833->spi_set_cs(1); } } /***************************************************************************//** * @brief Writes to the frequency registers. * * @param - reg - Frequence register to be written to. * @param - val - The value to be written. *Fclk/2^28 × FREQREG * @return None. *******************************************************************************/ void AD9833_SetFrequency(unsigned short reg, unsigned long val) { unsigned short freqHi = reg; unsigned short freqLo = reg; unsigned int value=0; double temp=val/((AD9833_Frequency)/(268435456.0)); value=(int)temp; freqHi |= (value & 0xFFFC000) >> 14 ; freqLo |= (value & 0x3FFF); /*写控制字Control word write(D15, D14 = 00), B28 (D13) = 1*/ AD9833_SetRegisterValue(AD9833_B28); AD9833_SetRegisterValue(freqLo); AD9833_SetRegisterValue(freqHi); } /***************************************************************************//** * @brief Writes to the phase registers. * * @param - reg - Phase register to be written to. * @param - val - The value to be written. *2π/4096 × PHASEREG * @return None. *******************************************************************************/ void AD9833_SetPhase(unsigned short reg, unsigned short val) { unsigned short phase = reg; phase |= val; AD9833_SetRegisterValue(phase); } /***************************************************************************//** * @brief Selects the Frequency,Phase and Waveform type. * * @param - freq - Frequency register used. * @param - phase - Phase register used. * @param - type - Type of waveform to be output. * * @return None. *******************************************************************************/ void AD9833_Setup(unsigned short freq, unsigned short phase, unsigned short type) { unsigned short val = 0; val = freq | phase | type; AD9833_SetRegisterValue(val); } /***************************************************************************//** * @brief Sets the type of waveform to be output. * * @param - type - type of waveform to be output. * * @return None. *******************************************************************************/ void AD9833_SetWave(unsigned short type) { AD9833_SetRegisterValue(type); }