有ADS1118评估板用热电偶测温度的C示例程序吗？

haichao shen

Intellectual 381 points

Other Parts Discussed in Thread: ADS1118, OPA335

主页给的是labview的，没那个软件，估计也看不太懂，有用C写好的吗？

11 年多前

HaiTao Li 11 年多前

Intellectual 920 points

论坛里面没有完整的。

Luke Sun 11 年多前

TI__Intellectual 1130 points

hi haichao shen,

没有非常规范的C样例程序，建议你参考 http://e2e.ti.com/support/data_converters/precision_data_converters/f/73/t/231496.aspx

HaiTao Li 11 年多前回复 Luke Sun

Intellectual 920 points

呃，不同系列的MCU用的程序还是不一样的吧.......想找那种完全可以参考的很难了

HaiTao Li 11 年多前回复 HaiTao Li

Intellectual 920 points

可以考虑CCS5.3里面的例子程序，MCU与ADS1118主要就是四线SPI的通讯，在CCS5.3里面有现成的SPI通讯例子，通过Lauchpad连接ADS1118，ADS1118取六根线简易焊接就成，能快速测试。不过这种方式用MSP430F/G的MCU。

寄存器配置都在手册上有，建议从低采样率和1倍放大可是测试。

如果要是做评估的话，实验板严格按照手册制作。

如果不打算做实验板的话，那还是买个EVM什么的吧。

haichao shen 11 年多前回复 HaiTao Li

Intellectual 381 points

谢谢楼上几位，这里回复快多了。我先去做一个实验板，回来参考手册编写程序试试吧

Wayne Xu 11 年多前

TI__Genius 9936 points

我这里有基于MSP430 Launchpad的C语言程序，这是为ADS1118 Booster Pack设计的程序。ADS1118 Booster Pack即将release.

下面把关键代码贴在论坛里。如有问题也可以发email给我。

我在头文件里定义了

//Set the configuration to AIN0/AIN1, FS=+/-0.256, SS, DR=128sps, PULLUP on DOUT
#define ADSCON_CH0 (0x8B8A)
//Set the configuration to AIN2/AIN3, FS=+/-0.256, SS, DR=128sps, PULLUP on DOUT
#define ADSCON_CH1 (0xBB8A)

下面是C语言程序的两个关键函数。

int WriteSPI(unsigned int config, int mode)
{
int msb;
unsigned int temp;
char dummy;

//change the polarity of UCI0B_CLK to driver ADS1118.
UCB0CTL1 |= UCSWRST;
UCB0CTL0 = UCMSB + UCMST + UCMODE_0 + UCSYNC;
UCB0CTL1 &= ~UCSWRST;

temp = config;
if (mode==1)
temp = config | 0x8000; // mode == 1, means to read the data and start a new convertion.

while(!(UC0IFG&UCB0TXIFG));
UCB0TXBUF = (temp >> 8 ); // Write MSB of Confige
while(!(UC0IFG&UCB0RXIFG));
msb=UCB0RXBUF; // Read MSB of Result

while(UCBUSY & UCB0STAT);

while(!(UC0IFG&UCB0TXIFG));
UCB0TXBUF= (temp & 0xff); // Write LSB of Config
while(!(UC0IFG&UCB0RXIFG));
msb = (msb << 8) | UCB0RXBUF ; //Read LSB of Result

while(UCBUSY & UCB0STAT);

while(!(UC0IFG&UCB0TXIFG));
UCB0TXBUF = (temp >> 8 ); // Write MSB of Config
while(!(UC0IFG&UCB0RXIFG));
dummy=UCB0RXBUF; // Read MSB of Config

while(UCBUSY & UCB0STAT);

while(!(UC0IFG&UCB0TXIFG));
UCB0TXBUF= (temp & 0xff); // Write LSB of Config
while(!(UC0IFG&UCB0RXIFG));
dummy=UCB0RXBUF; //Read LSB of Config

while(UCBUSY & UCB0STAT);

//change back the polarity of UCI0B_CLK for deriving LCD
UCB0CTL1 |= UCSWRST;
UCB0CTL0 = UCCKPL + UCMSB + UCMST + UCMODE_0 + UCSYNC;
UCB0CTL1 &= ~UCSWRST;

return msb;
}

/******************************************************************************
* function: ADS_Read(unsigned int mode)
* introduction: read the ADC result and tart a new conversion.
* parameters:
* mode = 0, ADS1118 is set to convert the voltage of integrated temperature sensor.
* mode = 1, ADS1118 is set to convert the voltage of thermocouple.
* return value:result of last conversion
*/
int ADS_Read(unsigned int mode)
{
unsigned int tmp;
int result;

if(flag & BIT9)
{
if (mode==1) // Set the configuration to AIN0/AIN1, FS=+/-0.256, SS, DR=128sps, PULLUP on DOUT
tmp = ADSCON_CH1;
else
tmp = ADSCON_CH1 + ADS1118_TS;// temperature sensor mode.DR=8sps, PULLUP on DOUT
}
else
{
if (mode==1) // Set the configuration to AIN0/AIN1, FS=+/-0.256, SS, DR=128sps, PULLUP on DOUT
tmp = ADSCON_CH0;
else
tmp = ADSCON_CH0 + ADS1118_TS;// temperature sensor mode.DR=8sps, PULLUP on DOUT
}

// Reset CS low
P2OUT &= ~BIT0;

// Write Config
result = WriteSPI(tmp,1);

// Set CS high to end transaction
P2OUT |= BIT0;

return result;
}