ADC0832channel:通道0和通道1选择
时间: 2023-11-06 18:40:23 浏览: 59
ADC0832是一个8位分辨率的模数转换器,具有8个输入通道(0-7)。要选择通道0或通道1,需要将片选引脚(CS)连接到控制器的一个数字输出引脚,然后将通道选择引脚(CH0和CH1)连接到另外两个数字输出引脚。通过控制这两个引脚的电平,您可以选择要转换的通道。例如,当CH0为低电平,CH1为高电平时,将选择通道1进行转换。您可以参考ADC0832的数据手册获取更多详细信息。
相关问题
ADC0832双通道代码
以下是一个使用Python编写的ADC0832双通道代码的示例:
```python
import RPi.GPIO as GPIO
import time
# 定义引脚
CLK = 11
DOUT = 9
DIN = 10
CS = 8
# 初始化GPIO
def init():
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(CLK, GPIO.OUT)
GPIO.setup(DOUT, GPIO.IN)
GPIO.setup(DIN, GPIO.OUT)
GPIO.setup(CS, GPIO.OUT)
# 读取ADC值
def getADC(channel):
# 选择通道
if channel == 0:
GPIO.output(CS, GPIO.LOW)
else:
GPIO.output(CS, GPIO.HIGH)
# 时钟信号
GPIO.output(CLK, GPIO.LOW)
GPIO.output(DIN, GPIO.HIGH)
GPIO.output(CLK, GPIO.HIGH)
# 读取数据
value = 0
for i in range(8):
GPIO.output(CLK, GPIO.LOW)
GPIO.output(CLK, GPIO.HIGH)
value = value << 1 | GPIO.input(DOUT)
# 关闭通道
GPIO.output(CS, GPIO.HIGH)
return value
# 主函数
def main():
try:
init()
while True:
# 读取通道0的值
channel0_value = getADC(0)
# 读取通道1的值
channel1_value = getADC(1)
# 打印结果
print("Channel 0: ", channel0_value)
print("Channel 1: ", channel1_value)
time.sleep(1)
except KeyboardInterrupt:
GPIO.cleanup()
if __name__ == '__main__':
main()
```
这段代码使用了RPi.GPIO库来控制树莓派的GPIO引脚。首先,我们定义了CLK、DOUT、DIN和CS引脚的编号。然后,我们编写了初始化函数来设置GPIO模式和引脚方向。接下来,我们编写了getADC函数来读取ADC的值。在主函数中,我们初始化GPIO并循环读取通道0和通道1的值,并打印结果。最后,我们通过捕获KeyboardInterrupt异常来清理GPIO引脚。
unsigned int ADC_Read(unsigned char channel) { unsigned int result = 0; unsigned char i; unsigned char j; unsigned int out = 0; unsigned char nres = 0; switch(channel) // 选择ADC0832 { case 1: ADC0832_CS1 = 0; ADC0832_CS2 = 1; ADC0832_CS3 = 1; ADC0832_CS4 = 1; break; case 2: ADC0832_CS1 = 1; ADC0832_CS2 = 0; ADC0832_CS3 = 1; ADC0832_CS4 = 1; break; case 3: ADC0832_CS1 = 1; ADC0832_CS2 = 1; ADC0832_CS3 = 0; ADC0832_CS4 = 1; break; case 4: ADC0832_CS1 = 1; ADC0832_CS2 = 1; ADC0832_CS3 = 1; ADC0832_CS4 = 0; break; default: return 0; } ADC0832_CLK = 0; ADC0832_DO = 1; ADC0832_CLK = 1; ADC0832_CLK = 0; ADC0832_DO = 1; ADC0832_CLK = 1; ADC0832_CLK = 0; result=0; 修改这段代码,使得4个ADC0832分别接收4个MPX4115的压力信号
首先,需要将MPX4115的压力信号接到ADC0832的输入端口上。假设分别将MPX4115的压力信号接到了ADC0832的CH0、CH1、CH2、CH3输入端口上。
然后,需要修改ADC_Read函数的switch语句部分,使得不同的通道对应不同的ADC0832输入通道。修改后的代码如下:
```
switch(channel)
{
case 1:
ADC0832_CS1 = 0;
ADC0832_CS2 = 1;
ADC0832_CS3 = 1;
ADC0832_CS4 = 1;
break;
case 2:
ADC0832_CS1 = 1;
ADC0832_CS2 = 0;
ADC0832_CS3 = 1;
ADC0832_CS4 = 1;
break;
case 3:
ADC0832_CS1 = 1;
ADC0832_CS2 = 1;
ADC0832_CS3 = 0;
ADC0832_CS4 = 1;
break;
case 4:
ADC0832_CS1 = 1;
ADC0832_CS2 = 1;
ADC0832_CS3 = 1;
ADC0832_CS4 = 0;
break;
default:
return 0;
}
// 将ADC0832的CH0、CH1、CH2、CH3输入通道对应到MPX4115的压力信号
switch(channel)
{
case 1:
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH0 > 0) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH0 > 1) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH0 > 2) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH0 > 3) ? 1 : 0;
ADC0832_CLK = 1;
break;
case 2:
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH1 > 0) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH1 > 1) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH1 > 2) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH1 > 3) ? 1 : 0;
ADC0832_CLK = 1;
break;
case 3:
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH2 > 0) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH2 > 1) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH2 > 2) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH2 > 3) ? 1 : 0;
ADC0832_CLK = 1;
break;
case 4:
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH3 > 0) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH3 > 1) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH3 > 2) ? 1 : 0;
ADC0832_CLK = 1;
ADC0832_CLK = 0;
ADC0832_DO = (MPX4115_CH3 > 3) ? 1 : 0;
ADC0832_CLK = 1;
break;
default:
return 0;
}
```
其中,MPX4115_CH0、MPX4115_CH1、MPX4115_CH2、MPX4115_CH3分别表示四个MPX4115的压力信号,假设其取值范围为0~15,表示0~5V的输入电压分别经过了ADC的0~15个刻度,需要将其转换为二进制信号输入到ADC0832中。
具体实现方式是:首先将ADC0832的CLK置为0,然后判断MPX4115的压力信号是否大于当前输入刻度,如果大于,则将DO置为1,否则置为0;然后将CLK置为1,再将CLK置为0,依次输入四个信号位,最后将CLK置为1,完成一次输入。
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)