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Update ADS1256.py #20

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8e1fa66
Update ADS1256.py
jesgome Dec 16, 2022
11c0f15
Merge branch 'master' into patch-1
jesgome May 16, 2026
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82 changes: 49 additions & 33 deletions RaspberryPI/AD-DA/python/ADS1256.py
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Original file line number Diff line number Diff line change
@@ -1,9 +1,28 @@
#############################################
#
# Version: 19.08.2022
#
# Author: Waveshare Team
#
# Editor: Jesus Gomez
#
# This is the Waveshare python library for ADS1256 ADC shield. There are 3 major updates to
# the original function libraries:
#
# 1 - ScanMode for single or differential input is now supported
# with ADS1256_SetMode(mode)
#
# 2 - Analog input buffer activation is now supported
# with ADS1256_SetBuffEn(data)
#
# 3 - Set channels and get all functions now support single or differential
# input modes
#
# These updates are set as pull requests in github. Upvote if you like and use them and
# make sure to reference my work in your projects!
#
import config


ScanMode = 0


# gain channel
ADS1256_GAIN_E = {'ADS1256_GAIN_1' : 0, # GAIN 1
'ADS1256_GAIN_2' : 1, # GAIN 2
Expand Down Expand Up @@ -120,35 +139,33 @@ def ADS1256_ConfigADC(self, gain, drate):
buf[1] = 0x08
buf[2] = (0<<5) | (0<<3) | (gain<<0)
buf[3] = drate

config.digital_write(self.cs_pin, 0)#cs 0
config.digital_write(self.cs_pin, GPIO.LOW)#cs 0
config.spi_writebyte([CMD['CMD_WREG'] | 0, 0x03])
config.spi_writebyte(buf)

config.digital_write(self.cs_pin, 1)#cs 1
config.digital_write(self.cs_pin, GPIO.HIGH)#cs 1
config.delay_ms(1)

def ADS1256_SetMode(self,Mode): # New function for single and differential input
self.ScanMode=Mode

def ADS1256_SetBuffEn(self,data): # New function to enable high impedance input buffer
if data==0:
return 0
else:
self.ADS1256_WriteReg(REG_E['REG_STATUS'],0x02)

def ADS1256_SetChannal(self, Channal):
if Channal > 7:
if Channal>7:
return 0
self.ADS1256_WriteReg(REG_E['REG_MUX'], (Channal<<4) | (1<<3))
self.ADS1256_WriteReg(REG_E['REG_MUX'],(Channal<<4)|(1<<3))

def ADS1256_SetDiffChannal(self, Channal):
if Channal == 0:
self.ADS1256_WriteReg(REG_E['REG_MUX'], (0 << 4) | 1) #DiffChannal AIN0-AIN1
elif Channal == 1:
self.ADS1256_WriteReg(REG_E['REG_MUX'], (2 << 4) | 3) #DiffChannal AIN2-AIN3
elif Channal == 2:
self.ADS1256_WriteReg(REG_E['REG_MUX'], (4 << 4) | 5) #DiffChannal AIN4-AIN5
elif Channal == 3:
self.ADS1256_WriteReg(REG_E['REG_MUX'], (6 << 4) | 7) #DiffChannal AIN6-AIN7

def ADS1256_SetMode(self, Mode):
ScanMode = Mode
if Channal>3:
return 0
self.ADS1256_WriteReg(REG_E['REG_MUX'],((2*Channal)<<4)|(2*Channal+1)) #DiffChannal set

def ADS1256_init(self):
self.ADS1256_SetMode(0)
if (config.module_init() != 0):
return -1
self.ADS1256_reset()
Expand All @@ -165,7 +182,6 @@ def ADS1256_Read_ADC_Data(self):
self.ADS1256_WaitDRDY()
config.digital_write(self.cs_pin, 0)#cs 0
config.spi_writebyte([CMD['CMD_RDATA']])
# config.delay_ms(10)

buf = config.spi_readbytes(3)
config.digital_write(self.cs_pin, 1)#cs 1
Expand All @@ -177,30 +193,30 @@ def ADS1256_Read_ADC_Data(self):
return read

def ADS1256_GetChannalValue(self, Channel):
if(ScanMode == 0):# 0 Single-ended input 8 channel1 Differential input 4 channe
if(Channel>=8):
if self.ScanMode==0:# 0 Single-ended input 8 channel 1 Differential input 4 channel
if Channel>7:
return 0
self.ADS1256_SetChannal(Channel)
self.ADS1256_WriteCmd(CMD['CMD_SYNC'])
# config.delay_ms(10)
self.ADS1256_WriteCmd(CMD['CMD_WAKEUP'])
# config.delay_ms(200)
Value = self.ADS1256_Read_ADC_Data()
else:
if(Channel>=4):
if(Channel>3):
return 0
self.ADS1256_SetDiffChannal(Channel)
self.ADS1256_WriteCmd(CMD['CMD_SYNC'])
# config.delay_ms(10)
self.ADS1256_WriteCmd(CMD['CMD_WAKEUP'])
# config.delay_ms(10)
Value = self.ADS1256_Read_ADC_Data()
return Value

def ADS1256_GetAll(self):
ADC_Value = [0,0,0,0,0,0,0,0]
for i in range(0,8,1):
ADC_Value[i] = self.ADS1256_GetChannalValue(i)
if self.ScanMode==0:
ADC_Value = [0,0,0,0,0,0,0,0]
for i in range(0,8,1):
ADC_Value[i] = self.ADS1256_GetChannalValue(i)
else:
ADC_Value=[0,0,0,0]
for i in range(0,4,1):
ADC_Value[i]=self.ADS1256_GetChannalValue(i)
return ADC_Value
### END OF FILE ###