Using SPI IP Core

Using SPI IP Core

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This article discusses reading and writing operations on an SD card using the SPI external bus protocol based on Qsys.

1. Experimental Platform and Objectives:

The experiment uses the Altera Pioneer board with chip model: EP4CE10F17C8; an SD card is also required.

The main goal of this experiment is to utilize the SPI IP core to drive the SD card for read and write operations. In this experiment, we will learn how to use SPI and understand the methods for reading and writing to the SD card.

2. System Setup:

Using SPI IP Core

(1) Nios Processor Configuration:

Nios II/f

Using SPI IP Core

Other settings are default.

(2) SDRAM Controller Configuration

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(3) SPI IP Core Configuration

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(4) PIO IP Core Configuration

Using SPI IP Core

All other IP core configurations not shown are set to default.

3. Top-Level File

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PLL IP Core Configuration

Using SPI IP Core

clk c0 output is 100MHz with a phase offset of 0; clk c1 output is 100MHz with a phase offset of -60.

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System RTL:

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4. Pin Binding

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5. Software Code in Eclipse

(1) Experiment 1: Compile the following code and run as –> 3 Nios II Hardware

Using SPI IP Core

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Experiment Results:

The output will be displayed in the Nios II console:

Using SPI IP Core

Remove the SD card, insert it into a card reader, and open the WinHex software on your computer to access the SD card.

Using SPI IP Core

Select the corresponding disk to open the following interface:

Using SPI IP Core

(2) Experiment 2: SD Card Write Operation

Uncomment the code in the main function:

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Experiment Results:

Using SPI IP Core

From the code, we can see that the API provided by Altera, alt_avalon_spi_command(), is used to access the slave for read/write operations. Additionally, the SPI working mode must be set in Qsys, and the correct parameters must be provided to the alt_avalon_spi_command() function to achieve the desired results. It is important to note:

  • alt_avalon_spi_command() is only effective in master mode; in slave mode, data must be accessed directly from the SPI data register.

  • The SPI core does not match the generic device model types supported by HAL, so it cannot be accessed via HAL API or ANSI C standard library.

Using SPI IP Core

Using SPI IP CoreUsing SPI IP Core

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Original link:

https://blog.csdn.net/xzs520xzs/article/details/132148453

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