Ich versuche mit den DAC vom STM32F4 Discovery VCC/2 auszugeben. Hier
der code:
1 | GPIO_InitTypeDef GPIO_InitStruct;
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2 | DAC_InitTypeDef DAC_InitStruct;
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3 |
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4 | RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
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5 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
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6 |
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7 | ...
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8 | //Weitere Inits
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9 | ...
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10 |
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11 | GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4;
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12 | GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
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13 | GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
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14 | GPIO_Init(GPIOA, &GPIO_InitStruct);
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15 |
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16 | DAC_InitStruct.DAC_Trigger = DAC_Trigger_None;
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17 | DAC_InitStruct.DAC_WaveGeneration = DAC_WaveGeneration_None;
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18 | DAC_InitStruct.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
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19 | DAC_Init(DAC_Channel_1, &DAC_InitStruct);
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20 | DAC_Cmd(DAC_Channel_1, ENABLE);
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21 |
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22 | DAC_SetChannel1Data(DAC_Align_12b_R, 2048);
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An PA4 liegen aber konstant 2.92 Volt an. Woran liegt das?