MCP4728 .c/.h (DAC)

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mcp4728.h:
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#ifndef MCP4728_H
#define MCP4728_H

#include "stm32h7xx_hal.h"

typedef struct {
    I2C_HandleTypeDef *hi2c;
    uint8_t address; // Standard: 0x60
} MCP4728_HandleTypeDef;

typedef enum {
    MCP4728_CHANNEL_A = 0,
    MCP4728_CHANNEL_B,
    MCP4728_CHANNEL_C,
    MCP4728_CHANNEL_D
} MCP4728_Channel;

HAL_StatusTypeDef MCP4728_WriteChannel(MCP4728_HandleTypeDef *hmcp, MCP4728_Channel channel, uint16_t value); // 12-bit

#endif // MCP4728_H
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mcp4728.c:
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#include "mcp4728.h"

HAL_StatusTypeDef MCP4728_WriteChannel(MCP4728_HandleTypeDef *hmcp, MCP4728_Channel channel, uint16_t value) {
    if (channel > MCP4728_CHANNEL_D || value > 0x0FFF) return HAL_ERROR;

    uint8_t command = 0x40 | (channel << 1); // Fast write
    uint8_t data[3];
    data[0] = command;
    data[1] = (value >> 4) & 0xFF;
    data[2] = (value << 4) & 0xF0;

    return HAL_I2C_Master_Transmit(hmcp->hi2c, hmcp->address << 1, data, 3, HAL_MAX_DELAY);
}
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Anwendungsbeispiel:
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...
extern I2C_HandleTypeDef hi2c1;

void Test_MCP4728(void) {
    MCP4728_HandleTypeDef dac = {
        .hi2c = &hi2c1,
        .address = 0x60 // Standardadresse
    };

    // Setze Kanal A auf halbe Spannung
    MCP4728_WriteChannel(&dac, MCP4728_CHANNEL_A, 2048);

    // Erhöhe langsam Kanal B
    for (uint16_t i = 0; i < 4096; i += 256) {
        MCP4728_WriteChannel(&dac, MCP4728_CHANNEL_B, i);
        HAL_Delay(100);
    }
}
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