- mvn clean package
- cd target/distribution
- sudo ./runADS1256.sh
Note_0 Within the code of this application, The use of -rp or -sp and all AD/DA parms will be ignored
Tested
ADS1256 module mounted. The chip I have has no vref input pin and no labeling
nor documentation. Used a VOM to map lines from the ADS1256 to external pins
It appears the DVdd 5V is used as the V-reference.
--Connections
--Chip connected to SPI0
-Pi----------------Module pin number----------------------Pi
--3.3V-----------AIN0 ch0----------P1 Syn/PwrD--------------3.3V tie high
--5v------------ AIN1 ch1----------P2 CS-----------------GPIO22 Chip select
-----------------AIN2 ch2----------P3 DRDY----------------PIO17
-----------------AIN3 ch3----------P4 Dout---------------GPIO9 MISO
-----------------AIN4 ch4----------P5 Din----------------GPIO10 MOSI
-----------------AIN5 ch5----------P6 Sclk----------------GPIO11 SCLK
-----------------AIN6 ch6----------P7 Agnd----------------Gnd
-----------------AIN7 ch7----------P8 DVdd----------------5V
-----------------D0
-----------------D1
-----------------D2
-----------------D3
The Syn/PwrD is tied high. The program does not use the Sync pin to initiate a conversion, rather the issue the SYNC and WAKEUP commands. This module does not expose the RESET line.
Also note, the ChipSelect 'CS' uses GPIO22, not the Pi normal CS0 or CS1 associated with SPI0. Required as operations span more than a single SPI function and the chip must remain selected.
-cs and -drdy required for this chip configuration.
-rst and -pdwn should not be used
sudo ./runADS1256.sh -pp AIN0 -pn AIN1 -cs 22 -drdy 17 -t trace -x
No reset pin and no powerDown pin omitt -rst 18 -pdwn 27
sudo ./runADS1256.sh -pp AIN1 -pn AINCOM -cs 22 -drdy 17 -t trace -x -vref 5.0 TRACE com.pi4j.devices.ads1256.ADS1256 Channel :1/8 value :8388607 INFO com.pi4j.devices.ads1256.ADS1256 - A/D read input voltage : 5.0
sudo ./runADS1256.sh -pp AIN1 -pn AINCOM -cs 22 -drdy 17 -t trace -x -vref 5.0
TRACE com.pi4j.devices.ads1256.ADS1256 Channel :0/8 value :5441076 INFO com.pi4j.devices.ads1256.ADS1256 - A/D read input voltage : 3.243134408370782
sudo ./runADS1256.sh -pp AIN1 -pn AIN0 -cs 22 -drdy 17 -t trace -x -vref 5.0 TRACE com.pi4j.devices.ads1256.ADS1256 - Channel :1/0 value :3031976 INFO com.pi4j.devices.ads1256.ADS1256 - A/D read input voltage : 1.8071987399099756
-vref option: if > 0, feature will display calculated Channel input voltage.
ADS1256 module mounted within Waveshare AD/DA board
Chip connected to SPI0
Pi---------------AD/DA---BOARD---------------------------Pi
-10K-pot-5V------ch0----------P13----Syn/PwrD------------GPIO 27
-LDR-------------ch1----------P15----CS------------------GPIO22 Chip select
-----------------ch2----------P11----DRDY----------------GPIO17
-----------------ch3----------P21----Dout----------------GPIO9 MISO
-----------------ch4----------P19----Din-----------------GPIO10 MOSI
-----------------ch5----------P23----Sclk----------------GPIO11 SCLK
-----------------ch6----------P6-----Agnd----------------Gnd
-----------------ch7----------P2-----DVdd----------------5V See Note_1
-GPIO26----------D0-----------P12----RESET---------------GPIO18
-GPIO19----------D1
-GPIO13----------D2
-GPIO6-----------D3
The Syn/PwrD is configured as HIGH under all conditions. The program does not use the Sync pin to initiate a conversion, rather to issue the SYNC and WAKEUP commands.
Also note, the ChipSelect 'CS' uses GPIO22, not the Pi normal CS0 or CS1 associated with SPI0. Required as operations span more than a single SPI function and the chip must remain selected.
-cs -drdy -rst and -pdwn required for this chip configuration.
sudo ./runADS1256.sh -pp AIN1 -pn AINCOM -cs 22 -drdy 17 -rst 18 -pdwn 27 -t trace -x -vref 5.0
-vref option: if > 0, feature will display calculated Channel input voltage.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! NOTE_1 !!!!!! ADS1256 must operate with Vcc 3.3v. Needed to be compatible with Pi logic voltage !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!! WARNING: WHen the AD/DA bard is strapped VCC-3.3, the Pi4 may not power on. Seems the drag on the 3.3v prevents the Pi boot.
DRDY low ->> data conversion complete, RDATA 24 bits.
Single shot WREG set channel STANDBY cmd WAKEUP delay 33 microSeconds DRDY low RDATA STANDBY