数码小叶 发表于 2015-6-30 15:08
要不你把完整的工程传上来吧，还有你用的哪个通道，没见开启啊
#include
#include
#include
void clock_config(void);
void select_xt1(void);
void dco_config(void);
void adc12_config(void);
void uart_config(void);
char second_flag = 0;
int main(void)
{
clock_config(); // 初始化时钟
adc12_config(); // 初始化ADC12
uart_config();
TA1CCTL0 = CCIE; // 使能TA1CCR0，比较匹配中断
TA1CCR0 = 32768; // 初始化最大值,发生比较匹配中断频率 32768/32768 = 1Hz
TA1CTL = TASSEL_1 + MC_1 + TACLR; // 选择ACLK，最大值为CCR0，清除计数值
_EINT(); // 初始化全局中断
while(1)
{
if( second_flag )
{
second_flag = 0; // 1s时间到
ADC12CTL0 |= ADC12SC; // 启动转换
while(!(ADC12IFG & BIT0)); // 等待转换完成
// 被转换的通道为通道11 (AVCC-AVSS)/2;
// 此时转换的精度为12位——4096
float Current = ((ADC12MEM0 / 4096 * 3.3) - 1.388) / 3; //uA
printf("Current = %.3f\r\n",Current);
}
}
}
void clock_config(void)
{
WDTCTL = WDTPW + WDTHOLD; // 停止看门狗
select_xt1(); // 选择XT1
dco_config(); // ACLK = XT1 = 32.768K
// MCLK = SMCLK = 8000K
}
void select_xt1(void)
{
// 启动XT1
P7SEL |= 0x03; // P7.0 P7.1 外设功能
UCSCTL6 &= ~(XT1OFF); // XT1打开
UCSCTL6 |= XCAP_3; // 内部电容
do
{
UCSCTL7 &= ~XT1LFOFFG; //清除XT1错误标记
}while (UCSCTL7&XT1LFOFFG); // 检测XT1错误标记
}
void dco_config(void)
{
__bis_SR_register(SCG0);
UCSCTL0 = 0x0000;
UCSCTL1 = DCORSEL_5;
UCSCTL2 = FLLD_1 + 243;
__bic_SR_register(SCG0);
//必要延时
__delay_cycles(250000);
//清除错误标志位
do
{
UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + XT1HFOFFG + DCOFFG);
SFRIFG1 &= ~OFIFG;
}while(SFRIFG1 & OFIFG);
}
void adc12_config(void)
{
WDTCTL = WDTPW + WDTHOLD;
//只有在ADC12ENC复位情况下才可以操作
ADC12CTL0 &= ~ADC12ENC;
P6SEL |= 0x01; //使能A0输入通道
//ADC12CTL0 = ADC12ON;
REFCTL0 &= ~REFMSTR;
//ADC12CTL0 = ADC12SHT0_15 + ADC12SHT1_15 + ADC12ON + ADC12REF2_5V + ADC12REFON;
ADC12CTL0 = ADC12SHT0_15+ ADC12ON + ADC12REF2_5V + ADC12REFON;
ADC12CTL1 = ADC12SHP;
ADC12CTL2 |= ADC12TCOFF; //关闭内部温度检测以降低功耗
ADC12MCTL0 = ADC12SREF_1;
__delay_cycles(75);
ADC12CTL0 |= ADC12ENC;
}
void uart_config(void)
{
P3SEL = 0x30;
UCA0CTL1 |= UCSWRST;
UCA0CTL1 |= UCSSEL_1;
UCA0BR0 = 3;
UCA0BR1 = 0;
UCA0MCTL |= UCBRS_3 + UCBRF_0;
UCA0CTL1 &= ~UCSWRST;
UCA0IE |= UCRXIE;
}
int putchar(int ch)
{
UCA0TXBUF = ch;
while(!(UCA0IFG & UCTXIFG));
return ch;
}
#pragma vector = TIMER1_A0_VECTOR
__interrupt void TIMER1_A0_ISR(void)
{
second_flag = 1;
}
微控制器 MCU