Hello,
I am new to microcontroller programming. I am trying to read a digital
microphone with a 24bit i2s interface. My problem is that the results I
get are just uint16_t thus I loose some bits.
I'm using st cube and HAL. The api documentation is:
1 | /**
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2 | * @brief Receive an amount of data in blocking mode
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3 | * @param hi2s: pointer to a I2S_HandleTypeDef structure that contains
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4 | * the configuration information for I2S module
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5 | * @param pData: a 16-bit pointer to data buffer.
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6 | * @param Size: number of data sample to be sent:
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7 | * @note When a 16-bit data frame or a 16-bit data frame extended is selected during the I2S
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8 | * configuration phase, the Size parameter means the number of 16-bit data length
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9 | * in the transaction and when a 24-bit data frame or a 32-bit data frame is selected
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10 | * the Size parameter means the number of 16-bit data length.
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11 | * @param Timeout: Timeout duration
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12 | * @note The I2S is kept enabled at the end of transaction to avoid the clock de-synchronization
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13 | * between Master and Slave(example: audio streaming).
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14 | * @note In I2S Master Receiver mode, just after enabling the peripheral the clock will be generate
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15 | * in continuous way and as the I2S is not disabled at the end of the I2S transaction.
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16 | * @retval HAL status
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17 | */
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18 | HAL_StatusTypeDef HAL_I2S_Receive(I2S_HandleTypeDef *hi2s, uint16_t *pData, uint16_t Size, uint32_t Timeout)
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I tried
1 | uint16_t I2S_RX_BUFFER2[24];
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2 | HAL_I2S_Receive(&hi2s1, (uint16_t*)I2S_RX_BUFFER2, 24, 0x1000);
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My i2s is initialized for 24bit MSB first. How can I get 24bit results?
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