AD5420驱动程序
时间: 2023-08-08 15:07:54 浏览: 82
AD5420是一款4-20mA输出电流驱动器,可用于控制温度、压力、流量等传感器输出的信号。下面是一个可能的AD5420驱动程序示例,使用SPI接口与外部微控制器通信:
```c
#include <SPI.h>
// SPI pins
const int SPICLK = 13;
const int SPIMISO = 12;
const int SPIMOSI = 11;
const int CS = 10; // chip select
// AD5420 control registers
const byte REG_CTRL = 0x00; // control register
const byte REG_DAC = 0x01; // DAC register (output value)
// control register bits
const byte CTRL_SEL = 0x80; // select control register
const byte CTRL_CLR = 0x40; // clear LDAC pin
const byte CTRL_SDODIS = 0x20; // disable SDO pin
const byte CTRL_RANGE = 0x10; // set output range (0 = 4-20mA, 1 = 0-20mA)
const byte CTRL_BIAS = 0x08; // enable bias current
const byte CTRL_SF = 0x04; // set span fault detect
const byte CTRL_CF = 0x02; // set current fault detect
const byte CTRL_EN = 0x01; // enable output
// output range limits
const uint16_t RANGE_MIN = 0x0000; // 4mA
const uint16_t RANGE_MAX = 0xFFFF; // 20mA
// initialize SPI
void setupSPI() {
SPI.begin();
SPI.setClockDivider(SPI_CLOCK_DIV4);
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE0);
pinMode(CS, OUTPUT);
digitalWrite(CS, HIGH); // deselect
}
// send data to AD5420
void sendAD5420(byte reg, uint16_t data) {
digitalWrite(CS, LOW);
SPI.transfer(reg);
SPI.transfer(highByte(data));
SPI.transfer(lowByte(data));
digitalWrite(CS, HIGH);
}
// set AD5420 output value (in range 0-4095)
void setOutputValue(uint16_t value) {
// limit to output range
if (value < RANGE_MIN) {
value = RANGE_MIN;
}
if (value > RANGE_MAX) {
value = RANGE_MAX;
}
// send to DAC register
sendAD5420(CTRL_SEL | REG_DAC, value);
}
// initialize AD5420 control register
void initAD5420() {
// enable output, set output range to 4-20mA
byte ctrl = CTRL_EN | CTRL_RANGE;
// clear LDAC pin, disable SDO pin, enable bias current,
// set span and current fault detect
ctrl |= CTRL_CLR | CTRL_SDODIS | CTRL_BIAS | CTRL_SF | CTRL_CF;
sendAD5420(CTRL_SEL | REG_CTRL, ctrl);
}
void setup() {
setupSPI();
initAD5420();
}
void loop() {
// example: set output to 12mA
setOutputValue(map(12, 4, 20, 0, 4095));
}
```
这个程序使用Arduino的SPI库连接到AD5420芯片,并提供了一些功能函数来设置输出值和初始化控制寄存器。可以根据需要修改控制寄存器的设置,例如禁用故障检测或启用0-20mA输出范围。注意,输出值应该在AD5420的输出范围内限制。
相关推荐
![](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)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)