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器件型号：ADS1261 工具与软件：
大家好！
发送 RESET 命令以及配置 PGA、INPMUX 和基准电压时、地址回波会熄灭、我会遇到此问题。这三种配置和 One 命令每次都会发生此问题。 此外、寄存器值看起来不正确、因为(LSB)始终设置为高电平。 我已经使用逻辑分析仪来验证信号、微控制器正在发送正确的信号。 不过、我将获得 ADC 读数、例如、ADC 报告的电压为1.948V、而测量值为2.175V。
我使用的是 Arduino 框架和 Espressif ESP32-S3-DevKitC-1-N32R8V。
对于 SPI 模式、我选择了 SPI_MODE 1 (CPOL = 0、 CPHA = 1)、我尝试的 SPI CLK 速度在100kHz 至9MHz 之间变化、输出仍然相同。
以下是 C++代码片段：
ADS1261::ADS1261() : SPI_Instance(SPI0_Selector, (SPI_Chipselect)ADS1261_nCS, DataMode_1) {
// Configure GPIOs
pinMode(ADS1261_nReset, OUTPUT);
pinMode(ADS1261_nPWDN, OUTPUT);
pinMode(ADS1261_START, OUTPUT);
pinMode(ADS1261_nCS, OUTPUT);
pinMode(ADS1261_nDRDY, INPUT);
digitalWrite(ADS1261_nReset, HIGH); // Bring reset HIGH
digitalWrite(ADS1261_nPWDN, HIGH); // Power up ADC
digitalWrite(ADS1261_nCS, LOW); // Deselect ADC
// Hardware Reset Sequence
Serial.printf("Waiting for DRDY to be LOW\n");
while(digitalRead(ADS1261_nDRDY) != HIGH){
delayMicroseconds(100);
}
Serial.printf("DRDY is LOW\n");
SendCommand(0xF5,0x00);
digitalWrite(ADS1261_START, LOW);
delay(60);
Serial.println("ADS1261 Initialization Started...\n");
bool Success = true;
uint8_t Val = 0;
Serial.println("Sending RESET command...\n");
digitalWrite(ADS1261_nCS, LOW);
delayMicroseconds(100);
Success &= SendCommand(0x06, 0xAA);
delayMicroseconds(300);
// Unlock Registers
SendCommand(0xF5,0x00);
delayMicroseconds(300);
Serial.println("Configuring ADC Registers...\n");
/*
MODE1:
Currently in Chop mode and 17.8ms start delay
also tested with Normal mode, Continous mode with 50 microseconds
*/
Success &= SetRegister(0x03, 0x2D); // tested with 0x10 and 0x2D
delayMicroseconds(1000);
GetRegister(0x03,&Val);
Serial.println("---------------------------");
Serial.printf("Read Value: 0x%x\n",Val);
Serial.println("---------------------------");
delayMicroseconds(100);
/*
PGA
In Bypass mode
Gain: 1
*/
Success &= SetRegister(0x10, 0x00);
delayMicroseconds(100);
GetRegister(0x10,&Val);
Serial.println("---------------------------");
Serial.printf("Read Value: 0x%x\n",Val);
Serial.println("---------------------------");
delayMicroseconds(100);
/*
Internal Reference Voltage:
Internal Reference enabled
Internal ref. positive and negative
*/
Success &= SetRegister(0x06, 0x10); //also tested with 0x15
delayMicroseconds(100);
GetRegister(0x06,&Val);
Serial.println("---------------------------");
Serial.printf("Read Value: 0x%x\n",Val);
Serial.println("---------------------------");
delayMicroseconds(2000);
/*
INPMUX:
Postive Input: AIN0
NegativeInput: AINCOM
*/
Success &= SetRegister(0x11, 0x10);
delayMicroseconds(100);
GetRegister(0x11,&Val);
Serial.println("---------------------------");
Serial.printf("Read Value: 0x%x\n",Val);
Serial.println("---------------------------");
delayMicroseconds(100);
digitalWrite(ADS1261_START, HIGH);
Serial.println("Waiting for DRDY to be LOW...");
while(digitalRead(ADS1261_nDRDY) != HIGH){
delayMicroseconds(100);
}
Serial.println("DRDY is LOW");
if (!Success) {
Serial.println("Failed to initialize ADC registers!\n");
} else {
Serial.println("ADS1261 Initialization Successful!\n");
}
}
bool ADS1261::SetRegister(uint8_t const Address, uint8_t const Value)
{
const uint8_t WREGCommand = 0x40;
return SendCommand(WREGCommand + (Address & 0x1F), Value); // taken from the example code of TI
}
bool ADS1261::SendCommand(uint8_t const Command, uint8_t const Data)
{
const uint8_t BufferLen = 2;
uint8_t const WriteBuffer[BufferLen] = {Command, Data};
uint8_t ReadBuffer[BufferLen] = {0};
delayMicroseconds(10);
bool Success = SPI_Instance.ReadWrite(WriteBuffer, ReadBuffer, BufferLen);
Serial.println("---------------------------------------------------------");
Serial.printf("Sent Command: 0x%X 0x%X\n", WriteBuffer[0], WriteBuffer[1]);
Serial.printf("Received Response: 0x%X 0x%X\n", ReadBuffer[0], ReadBuffer[1]);
if(Command == 0x06){
delay(10);
}
Success &= ReadBuffer[0] == 0xFF;
Success &= ReadBuffer[1] == Command;
if(!Success){
Serial.printf("Failed to send command!\n");
Serial.printf("Writebuffer: 0x%x 0x%x\n", WriteBuffer[0], WriteBuffer[1]);
Serial.printf("ADC Command Buffer: 0x%x 0x%x\n", ReadBuffer[0], ReadBuffer[1]);
}else{
Serial.printf("Successful!\n");
}
Serial.println("---------------------------------------------------------");
return Success;
}
and the Output：
Waiting for DRDY to be LOW DRDY is LOW --------------------------------------------------------- Sent Command: 0xF5 0x0 Received Response: 0xFF 0xF5 Successful! --------------------------------------------------------- ADS1261 Initialization Started... Sending RESET command... --------------------------------------------------------- Sent Command: 0x6 0xAA Received Response: 0xFF 0x7 Failed to send command! Writebuffer: 0x6 0xaa ADC Command Buffer: 0xff 0x7 --------------------------------------------------------- --------------------------------------------------------- Sent Command: 0xF5 0x0 Received Response: 0xFF 0xF5 Successful! --------------------------------------------------------- Configuring ADC Registers... --------------------------------------------------------- Sent Command: 0x43 0x2D Received Response: 0xFF 0x43 Successful! --------------------------------------------------------- --------------------------- Read Value: 0x2d --------------------------- --------------------------------------------------------- Sent Command: 0x50 0x0 Received Response: 0xFF 0x51 Failed to send command! Writebuffer: 0x50 0x0 ADC Command Buffer: 0xff 0x51 --------------------------------------------------------- --------------------------- Read Value: 0x1 --------------------------- --------------------------------------------------------- Sent Command: 0x46 0x10 Received Response: 0xFF 0x47 Failed to send command! Writebuffer: 0x46 0x10 ADC Command Buffer: 0xff 0x47 --------------------------------------------------------- --------------------------- Read Value: 0x11 --------------------------- --------------------------------------------------------- Sent Command: 0x51 0x10 Received Response: 0xFF 0x51 Successful! --------------------------------------------------------- --------------------------- Read Value: 0x11 --------------------------- Waiting for DRDY to be LOW... DRDY is LOW Failed to initialize ADC registers!
