I2C
Demonstrates how to read and write data with I2C when programming with ADLX.
Command Prompts
| Command Prompt | Description |
|---|---|
| 1 | Display version. |
| 2 | Read. |
| 3 | Repeated read. |
| 4 | Write. |
| M/m | Display the command prompt menu. |
| Q/q | Terminate the application. |
Sample Path
/Samples/C/I2C/I2C
Code
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//
// Copyright (c) 2021 - 2025 Advanced Micro Devices, Inc. All rights reserved.
//
//-------------------------------------------------------------------------------------------------
#include "SDK/ADLXHelper/Windows/C/ADLXHelper.h"
#include "SDK/Include/II2C.h"
#define DATA_SIZE 2
// Display version
void ShowVersion(IADLXI2C* i2c);
// Read
void Read(IADLXI2C* i2c);
// Repeated read
void RepeatedRead(IADLXI2C* i2c);
// Write
void Write(IADLXI2C* i2c);
// Capability
void Capability(IADLXI2C* i2c);
// Menu
void MainMenu();
// Menu control
void MenuControl(IADLXI2C* i2c);
int main()
{
// Define return code
ADLX_RESULT res = ADLX_FAIL ;
// Initialize ADLX
res = ADLXHelper_Initialize();
if (ADLX_SUCCEEDED (res))
{
// Get system services
IADLXSystem* sys = ADLXHelper_GetSystemServices();
// Get GPU list
IADLXGPUList* gpus = NULL;
res = sys->pVtbl->GetGPUs(sys, &gpus);
// Get GPU interface
IADLXGPU* gpu = NULL;
adlx_uint index = 0;
res = gpus->pVtbl->At_GPUList(gpus, index, &gpu);
// Get I2C interface
IADLXI2C* i2c = NULL;
res = sys->pVtbl->GetI2C(sys, gpu, &i2c);
if (ADLX_SUCCEEDED (res))
{
MainMenu();
MenuControl(i2c);
}
// Release the I2C interface
if (i2c != NULL)
{
i2c->pVtbl->Release(i2c);
i2c = NULL;
}
// Release the GPU interface
if (gpu != NULL)
{
gpu->pVtbl->Release(gpu);
gpu = NULL;
}
// Release the GPUlist interface
if (NULL != gpus)
{
gpus->pVtbl->Release(gpus);
gpus = NULL;
}
}
else
{
printf("ADLX initialization failed\\n");
return 0;
}
// Destroy ADLX
res = ADLXHelper_Terminate();
printf("Destroy ADLX result: %d\\n", res);
// Pause to see the print out
system("pause");
return 0;
}
void ShowVersion(IADLXI2C* i2c)
{
adlx_int major;
adlx_int minor;
ADLX_RESULT res = i2c->pVtbl->Version(i2c, &major, &minor);
printf("\\tI2C version, major: %d, minor: %d\\n", major, minor);
printf("\\tres is: %d\\n", res);
}
void Read(IADLXI2C* i2c)
{
// Specific hardware requirements
adlx_byte data[DATA_SIZE] = { 0 };
ADLX_RESULT res = i2c->pVtbl->Read(i2c, I2C_LINE_OEM2 , 100, 0x93, 0x30, DATA_SIZE, data);
printf("\\tI2C read info:\\n\\t\\tline: I2C_LINE_OEM2\\n\\t\\tspeed: 100\\n\\t\\taddress: 0x93\\n\\t\\toffset: 0x30");
printf("\\n\\t\\tdataSize: %d\\n\\t\\tdata: %d\\n\\tres is: %d\\n", DATA_SIZE, (int)data[0], res);
}
void RepeatedRead(IADLXI2C* i2c)
{
// Specific hardware requirements
adlx_byte data[DATA_SIZE] = { 0 };
ADLX_RESULT res = i2c->pVtbl->RepeatedStartRead(i2c, I2C_LINE_OEM2 , 100, 0x93, 0x30, DATA_SIZE, data);
printf("\\tI2C read info:\\n\\t\\tline: I2C_LINE_OEM2\\n\\t\\tspeed: 100\\n\\t\\taddress: 0x93\\n\\t\\toffset: 0x30");
printf("\\n\\t\\tdataSize: %d\\n\\t\\tdata: %d\\n\\tres is: %d\\n", DATA_SIZE, (int)data[0], res);
}
void Write(IADLXI2C* i2c)
{
// Specific hardware requirements
adlx_byte data[DATA_SIZE] = { 0 };
data[0] = 176;
ADLX_RESULT res = i2c->pVtbl->Write(i2c, I2C_LINE_OEM2 , 100, 0x93, 0x30, DATA_SIZE, data);
printf("\\tI2C write info:\\n\\t\\tline: I2C_LINE_OEM2\\n\\t\\tspeed: 100\\n\\t\\taddress: 0x93\\n\\t\\toffset: 0x30");
printf("\\n\\t\\tdataSize: %d\\n\\t\\tdata: %d\\n\\tres is: %d\\n", DATA_SIZE, (int)data[0], res);
}
void Capability(IADLXI2C* i2c)
{
adlx_bool isSupported = false;
ADLX_RESULT res = i2c->pVtbl->IsSupported(i2c, I2C_LINE_OEM2 , 0x93, &isSupported);
printf("\\tI2C support info:\\n\\t\\tline: I2C_LINE_OEM2\\n\\t\\taddress: 0x93\\n\\t\\tisSupported: %d\\n", isSupported);
printf("\\tres is: %d\\n", res);
}
void MainMenu()
{
printf("\\tChoose from the following options:\\n");
printf("\\t->Press 1 to display version\\n");
printf("\\t->Press 2 to read\\n");
printf("\\t->Press 3 to repeated read\\n");
printf("\\t->Press 4 to write\\n");
printf("\\t->Press 5 to display capability\\n");
printf("\\t->Press Q/q to terminate the application\\n");
printf("\\t->Press M/m to display main menu options\\n");
}
void MenuControl(IADLXI2C* i2c)
{
int num = 0;
while ((num = getchar()) != 'q' && num != 'Q')
{
switch (num)
{
// Display version
case '1':
ShowVersion(i2c);
break;
// Read
case '2':
Read(i2c);
break;
// Repeated read
case '3':
RepeatedRead(i2c);
break;
// Write
case '4':
Write(i2c);
break;
// Capability
case '5':
Capability(i2c);
break;
// Display main menu options
case 'm':
case 'M':
MainMenu();
break;
default:
break;
}
}
}
