MSP430单片机片内12位DA产生正弦波C语言程序

ID:51337 · 发表于 2013-7-14 16:16

#include <msp430x16x.h>
//------------------------------------------------------------------------------
// 12-bit Sine Lookup table with 32 steps
//------------------------------------------------------------------------------
static int Sin_tab[32] = { 0x7FF,0xA78,0xCB2,0xE77,0xF9A,0xFFE,0xF9A,0xE77,0xCB2,0xA78,0x7FF,0x586,0x34C,0x187,0x064,0x000
,0x064,0x187,0x34C,0x586};
static int Cos_tab[32] = { 0xFFE,0xF9A,0xE77,0xCB2,0xA78,0x7FF,0x586,0x34C,0x187,0x064,0x000
,0x064,0x187,0x34C,0x586,0x7FF,0xA78,0xCB2,0xE77,0xF9A};
void main(void)
{
volatile unsigned int i;
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
//==========================选择高频振荡器=======================================
BCSCTL1 &= ~XT2OFF; // XT2= HF XTAL
do
{
IFG1 &= ~OFIFG; // Clear OSCFault flag
for (i = 0xFF; i > 0; i--); // Time for flag to set
}
while ((IFG1 & OFIFG)); //查看8M的震荡是否稳定 // OSCFault flag still set?
BCSCTL2 |= SELM_2 + SELS; //MCLK和SMCLK选择XT2// MCLK= SMCLK= XT2 (safe)
//================================================================================
ADC12CTL0 = REF2_5V + REFON;//内部基准电压 // Internal 2.5V ref
//================================================================================
DMACTL0 = DMA0TSEL_5 + DMA1TSEL_5; // DAC12IFG trigger触发器
DMA0SA = (int) Sin_tab;//首地址 // Source block address
DMA0DA = (int)&DAC12_0DAT; //目的地址 // Destination single address
DMA0SZ = 0x14; //长度 // Block size
DMA0CTL = DMADT_4 + DMASRCINCR_3 + DMAEN; // Rpt, inc src, word-word
DMA1SA = (int) Cos_tab; //首地址 // Source block address
DMA1DA = (int)&DAC12_1DAT; //目的地址 // Destination single address
DMA1SZ = 0x14; //长度 // Block size
DMA1CTL = DMADT_4 + DMASRCINCR_3 + DMAEN; // Rpt, inc src, word-word
DAC12_0CTL = DAC12LSEL_2 + DAC12IR + DAC12AMP_5 + DAC12IFG + DAC12ENC + DAC12GRP;
DAC12_1CTL = DAC12LSEL_2 + DAC12IR + DAC12AMP_5 + DAC12IFG + DAC12ENC;
CCTL1 = OUTMOD_3;//置位复位模式 // CCR1 set/reset
CCR1 = 1; //设置占空比 // CCR1 PWM Duty Cycle
CCR0 = 1; //设置周期 // Clock period of CCR0
TACTL = TASSEL_2 + MC_1; //定时器A的时钟源为SMCLK=8M，增计数模式 // SMCLK, upmode
_BIS_SR(CPUOFF); // CPU off
}

复制代码

ID:53173 · 发表于 2013-8-17 22:00

这个从哪个管脚输出正弦波

帐号		自动登录	找回密码
密码			立即注册