ADS1256 24位ADC模块■ 简介01接口电路板102软件命令03测试结果※ 结论

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我是靠谱客的博主健康月饼，这篇文章主要介绍ADS1256 24位ADC模块■ 简介01接口电路板102软件命令03测试结果※ 结论，现在分享给大家，希望可以做个参考。

■ 简介

ADS1256是一款 24bit ADC转换模块。 ADS1256可以通过SPI进行访问 的高精度的转换器。它的 ADS1256 数据手册 可以从 TI网站 查询到。

▲ ADS1256 24bitADC模块

^{▲ ADS1256 24bitADC模块}

下面给出了ADS1256的接口。根据ADS1256的数据手册介绍，其中：

用于MCU接口的SPI接口可以包含有/CS， SCLK， DIN， DOUT
D0 ~ D3 可以用于对外控制的数据接口。
SYNC可以用于数据同步作用。

▲ ADS1256 的接口定义

^{▲ ADS1256 的接口定义}

为了便于后期的MCU制作，制作一个6PIN的外部接口，包括有：

序号	符号	功能描述
1	+5V	工作电源
2	GND	电源地
3	CS	ADS1256片选端
4	SCK	ADS1256时钟
5	DIN	ADS1256SPI数据入
6	DOUT	ADS1256SPI数据出

01接口电路板¹

1. 设计接口电路

使用基于STC8G1K08（SOP8）作为控制ADS1256的与PC之间的SPI-UART的接口芯片。

▲ 实验电路的原理图

^{▲ 实验电路的原理图}

▲ 实验接口电路的PCB

^{▲ 实验接口电路的PCB}

2.单片机软件²

将AD1256连接到单片机STC8G1k。

▲ 将AD1256连接到单片机

^{▲ 将AD1256连接到单片机}

缺省情况下D0输出AD1256的时钟信号
时钟的频率为： 7.68MHz。

▲ AD1256输出CLK波形

^{▲ AD1256输出CLK波形}

02软件命令

UART串口命令可以参见SerialTXT的解释子程序：

复制代码

if(strcmp("hello",                (char *)STD_ARG[0]) == 0)
    printf("%s is ready !rn", VERSION_STRING);
else IFARG0("rra") {
    AD1256ReadReg(0x0, 11, ucDim);
    for(i = 0; i < 11; i ++) {
        printf("%02bx ", ucDim[i]);
    }
    printf("rn");
} else IFARG0("setc") {
    sscanf(SDA(1), "%d", &nNumber);
    AD1256SetChannel((unsigned char)nNumber);
} else IFARG0("sets") {
    sscanf(SDA(1), "%x", &nNumber);
    AD1256SetSPS((unsigned char)nNumber);
} else IFARG0("writer") {
    sscanf(SDA(1), "%x", &nNumber);
    i = (unsigned char)nNumber;
    sscanf(SDA(2), "%x", &nNumber);
    ucByte = (unsigned char)nNumber;
    AD1256WriteRegByte(i, ucByte);
} else IFARG0("rdata") {
    SendChar(0);
    nWaitTime = 100;
    if(STD_NUM == 1) {
        printf("%ldrn", AD1256ReadData());
    } else {
        sscanf(SDA(1), "%d", &nNumber);
        if(STD_NUM > 2) {
            sscanf(SDA(2), "%d", &nWaitTime);
        }
        for(j = 0; j < nNumber; j ++) {
            printf("%ld ", AD1256ReadData());
            if(nNumber > 1)
                WaitTime(nWaitTime);
        }
        printf("rn");
    }
} else IFARG0("setb") {
    sscanf(SDA(1), "%x", &nNumber);
    AD1256SetDIO((unsigned char)nNumber);
} else IFARG0("reset") {
    AD1256Reset();
} else IFARG0("init") {
    AD1256Init();
} else IFARG0("scrd") {
    sscanf(SDA(1), "%x", &nNumber);
    AD1256SetChannel(nNumber);
    AD1256ReadData();
    for(nNumber = 0; nNumber < 1000; nNumber ++) {
        WaitTime(2);
        if((AD1256ReadRegByte(0) & 0x1) == 0) break;
    }
    SendChar(0);
    printf("%ldrn", AD1256ReadData());
}

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if(strcmp("hello",                (char *)STD_ARG[0]) == 0)
    printf("%s is ready !rn", VERSION_STRING);
else IFARG0("rra") {
    AD1256ReadReg(0x0, 11, ucDim);
    for(i = 0; i < 11; i ++) {
        printf("%02bx ", ucDim[i]);
    }
    printf("rn");
} else IFARG0("setc") {
    sscanf(SDA(1), "%d", &nNumber);
    AD1256SetChannel((unsigned char)nNumber);
} else IFARG0("sets") {
    sscanf(SDA(1), "%x", &nNumber);
    AD1256SetSPS((unsigned char)nNumber);
} else IFARG0("writer") {
    sscanf(SDA(1), "%x", &nNumber);
    i = (unsigned char)nNumber;
    sscanf(SDA(2), "%x", &nNumber);
    ucByte = (unsigned char)nNumber;
    AD1256WriteRegByte(i, ucByte);
} else IFARG0("rdata") {
    SendChar(0);
    nWaitTime = 100;
    if(STD_NUM == 1) {
        printf("%ldrn", AD1256ReadData());
    } else {
        sscanf(SDA(1), "%d", &nNumber);
        if(STD_NUM > 2) {
            sscanf(SDA(2), "%d", &nWaitTime);
        }
        for(j = 0; j < nNumber; j ++) {
            printf("%ld ", AD1256ReadData());
            if(nNumber > 1)
                WaitTime(nWaitTime);
        }
        printf("rn");
    }
} else IFARG0("setb") {
    sscanf(SDA(1), "%x", &nNumber);
    AD1256SetDIO((unsigned char)nNumber);
} else IFARG0("reset") {
    AD1256Reset();
} else IFARG0("init") {
    AD1256Init();
} else IFARG0("scrd") {
    sscanf(SDA(1), "%x", &nNumber);
    AD1256SetChannel(nNumber);
    AD1256ReadData();
    for(nNumber = 0; nNumber < 1000; nNumber ++) {
        WaitTime(2);
        if((AD1256ReadRegByte(0) & 0x1) == 0) break;
    }
    SendChar(0);
    printf("%ldrn", AD1256ReadData());
}

scrd : Change Channel and read new data
rdata: Read the current channel data

03测试结果

▲ 设置电压与AD1256输出结果

^{▲ 设置电压与AD1256输出结果}

▲ 设置电压与AD1256输出结果

^{▲ 设置电压与AD1256输出结果}

复制代码

#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# TEST1.PY                     -- by Dr. ZhuoQing 2020-06-30
#
# Note:
#============================================================

from headm import *
from tsmodule.tsvisa        import *
from tsmodule.tsstm32       import *

dp1308open()
#------------------------------------------------------------

dp1308p25v(0)
dp1308n25v(0)

stm32cmd('reset')
time.sleep(.1)
stm32cmd('init')

setv = linspace(-5, 0, 5)

setdim = []
outdim = []

for v in setv:
    if v >= 0:
        dp1308p25v(v)
        dp1308n25v(0)
    else:
        dp1308p25v(0)
        dp1308n25v(-v)

time.sleep(1)
    meter = meterval()

stm32cmd('rdata')
    time.sleep(.05)
    data = stm32memo(1)
    val = data[0]

printf(val, meter)

outdim.append(val)
    setdim.append(meter[0])

plt.plot(setdim, outdim)
plt.xlabel("Set(V)")
plt.ylabel("Data")
plt.grid(True)
plt.show()

#------------------------------------------------------------
#        END OF FILE : TEST1.PY
#============================================================

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#!/usr/local/bin/python
# -*- coding: gbk -*-
#============================================================
# TEST1.PY                     -- by Dr. ZhuoQing 2020-06-30
#
# Note:
#============================================================

from headm import *
from tsmodule.tsvisa        import *
from tsmodule.tsstm32       import *

dp1308open()
#------------------------------------------------------------

dp1308p25v(0)
dp1308n25v(0)

stm32cmd('reset')
time.sleep(.1)
stm32cmd('init')

setv = linspace(-5, 0, 5)

setdim = []
outdim = []

for v in setv:
    if v >= 0:
        dp1308p25v(v)
        dp1308n25v(0)
    else:
        dp1308p25v(0)
        dp1308n25v(-v)

    time.sleep(1)
    meter = meterval()

    stm32cmd('rdata')
    time.sleep(.05)
    data = stm32memo(1)
    val = data[0]

    printf(val, meter)

    outdim.append(val)
    setdim.append(meter[0])

plt.plot(setdim, outdim)
plt.xlabel("Set(V)")
plt.ylabel("Data")
plt.grid(True)
plt.show()

#------------------------------------------------------------
#        END OF FILE : TEST1.PY
#============================================================