Description:
I’m currently working on interfacing the MAX5144 DAC using SPI communication on a Raspberry Pi. My setup uses SPI1 and CS1 (GPIO17). The project includes two programs: the main program (which interacts with the MAX5144) and an SPI test program (to verify SPI functionality).
1. gpio version: 3.12 For details type: gpio -warranty Hardware details: Type: CM4
2. PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
The SPI test program works perfectly, but the main program fails with the following error:Below, I’ve shared the key parts of my setup, including the code and relevant details.
---
CMake Configuration:---
Main Program Code:
Here is the main program where the error occurs:---
MAX5144.cpp:
Here is the class implementation for the MAX5144 DAC:---
SPI Testing Program:
This program successfully verifies that SPI1 and CS1 are functioning:---
Additional Information:
1. Hardware Test Results: The MAX5144 works perfectly when controlled using Python. This confirms there are no hardware-related issues with the SPI setup or the DAC itself.
2. Error Message in Main Program:3. SPI Test Program Results: This program works correctly, confirming that SPI1 and CS1 are properly configured.
---
Questions:
1. Why does the main program fail with the error about wiringPiSPI initialization?
2. Is there an issue with how I configure the `MAX5144` class, specifically with `wiringPiSPIDataRW(1, ...)` in the `setDacOutput` method?
3. How can I ensure the main program works correctly while keeping the same structure?
Thank you in advance for your insights and suggestions!![😊]()
I’m currently working on interfacing the MAX5144 DAC using SPI communication on a Raspberry Pi. My setup uses SPI1 and CS1 (GPIO17). The project includes two programs: the main program (which interacts with the MAX5144) and an SPI test program (to verify SPI functionality).
1. gpio version: 3.12 For details type: gpio -warranty Hardware details: Type: CM4
2. PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
The SPI test program works perfectly, but the main program fails with the following error:
Code:
```wiringPiSPI: Invalid SPI number/channel (need wiringPiSPIxSetupMode before read/write)```---
CMake Configuration:
Code:
```cmakecmake_minimum_required(VERSION 3.10)project(TemperatureControlProject)set(CMAKE_CXX_STANDARD 17)set(CMAKE_CXX_STANDARD_REQUIRED True)set(CMAKE_CXX_FLAGS "-g") # Add custom module path for FindWiringPi.cmakelist(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules")include_directories(include)# Main project executableadd_executable(TemperatureControlProject src/main.cpp src/MAX5144.cpp)find_package(WiringPi REQUIRED)target_link_libraries(TemperatureControlProject ${WIRINGPI_LIBRARY})# SPI test executableadd_executable(SPITest src/spi_test.cpp)target_link_libraries(SPITest -lwiringPi)```Main Program Code:
Here is the main program where the error occurs:
Code:
```cpp#include "MAX5144.h"#include <iostream>int main() { try { MAX5144 dac(1, 17); // SPI channel 1, CS pin GPIO17 dac.setDacOutput(4854); // Set DAC output value std::cout << "DAC output successfully set." << std::endl; } catch (const std::exception &e) { std::cerr << "Error: " << e.what() << std::endl; } return 0;}```MAX5144.cpp:
Here is the class implementation for the MAX5144 DAC:
Code:
```cpp#include "MAX5144.h"#include <wiringPi.h>#include <wiringPiSPI.h>#include <iostream>#include <stdexcept>MAX5144::MAX5144(int spiChannel, int csPin) : csPin(csPin) { wiringPiSetup(); pinMode(csPin, OUTPUT); digitalWrite(csPin, HIGH); if (wiringPiSPISetupMode(spiChannel, 500000, 0) < 0) { throw std::runtime_error("SPI initialization failed!"); }}void MAX5144::setDacOutput(int value) { if (value < 0 || value >= 16384) { throw std::invalid_argument("DAC value out of range!"); } int dataWord = value << 2; unsigned char msb = (dataWord >> 8) & 0xFF; unsigned char lsb = dataWord & 0xFF; digitalWrite(csPin, LOW); unsigned char buffer[2] = {msb, lsb}; wiringPiSPIDataRW(1, buffer, 2); // SPI channel 1 digitalWrite(csPin, HIGH); std::cout << "DAC output set to: " << value << std::endl;}MAX5144::~MAX5144() {}```SPI Testing Program:
This program successfully verifies that SPI1 and CS1 are functioning:
Code:
```cpp#include <wiringPiSPI.h>#include <iostream>#include <stdexcept>int main() { int spiChannel = 1; // Using SPI1 int speed = 500000; // SPI speed int mode = 0; // SPI mode 0 if (wiringPiSPISetupMode(spiChannel, speed, mode) < 0) { throw std::runtime_error("SPI1 initialization failed!"); } std::cout << "SPI1 initialized successfully!" << std::endl; unsigned char buffer[2] = {0xFF, 0x00}; // Test data if (wiringPiSPIDataRW(spiChannel, buffer, 2) < 0) { throw std::runtime_error("SPI1 data transfer failed!"); } std::cout << "SPI1 data sent successfully!" << std::endl; return 0;}```Additional Information:
1. Hardware Test Results: The MAX5144 works perfectly when controlled using Python. This confirms there are no hardware-related issues with the SPI setup or the DAC itself.
2. Error Message in Main Program:
Code:
``` wiringPiSPI: Invalid SPI number/channel (need wiringPiSPIxSetupMode before read/write) ``` ---
Questions:
1. Why does the main program fail with the error about wiringPiSPI initialization?
2. Is there an issue with how I configure the `MAX5144` class, specifically with `wiringPiSPIDataRW(1, ...)` in the `setDacOutput` method?
3. How can I ensure the main program works correctly while keeping the same structure?
Thank you in advance for your insights and suggestions!
Statistics: Posted by dgy411852 — Wed Jan 15, 2025 12:08 am