Analog Devices SHARC ADSP-214 Series Hardware Reference Manual page 736

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Programming Model

3. Send test data through the host device that can be used for calculat-

ing the baud rate of the incoming signal. A NULL character (0x00)

can be used for this purpose.

4. The baud rate can be derived from the width of timer as follows:

BAUDR = Width ÷ (8 × (number of zero data bits + 1)).

5. When using a NULL character, the number of zero data bits is 8.

Programs can also send some other pattern for this purpose. Once

the baud rate is calculated inside the timer ISR, the UART can be

programmed with the calculated baud rate.

Programming Model for DMA Transfers

The following is the general procedure for transferring data using DMA.

1. Clear the

2. Configure the UART DMA parameter registers (index, modify and

3. Configure the

4. Enable the DMA by setting the

Setting Up and Starting Chained DMA

To start a chain pointer DMA use the following steps.

1. Clear the chain pointer register

2. Initialize the chain pointer register with the address of the DMA

descriptor table. Set the

of each DMA block.

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bit if an interrupt is needed at the end

ADSP-214xx SHARC Processor Hardware Reference

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