sdk-bsp-rzn2l-etherkit/projects/etherkit_driver_spi

SCI_SPI Driver Usage Instructions

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Introduction

This example demonstrates how to use the RT-Thread SCI_SPI framework on the EtherKit.

Hardware Description

The EtherKit board has a PMOD interface, which is connected to the SCI_SPI3 of the R9A07G084M08GBG chip.

FSP Configuration Instructions

Open the FSP tool, create a new stack, and select r_sci_spi3:

RT-Thread Settings Configuration

In RT-Thread Settings, enable SCI hardware and configure SCI3 mode as SPI:

Example Project Description

This example uses the RT-Thread SCI driver framework to perform a loopback test on the PMOD interface (connecting PMOD's SPI3_MOSI to SPI3_MISO). The code is as follows:

void spi_loop_test(void)
{
#define TEXT_NUMBER_SIZE 1024
#define SPI_BUS_NAME "sci3s"
#define SPI_NAME "spi30"
    static uint8_t sendbuf[TEXT_NUMBER_SIZE] = {0};
    static uint8_t readbuf[TEXT_NUMBER_SIZE] = {0};
    for (int i = 0; i < sizeof(readbuf); i++)
    {
        sendbuf[i] = i;
    }
    static struct rt_spi_device *spi_dev = RT_NULL;
    struct rt_spi_configuration cfg;
    rt_hw_sci_spi_device_attach(SPI_BUS_NAME, SPI_NAME, NULL);
    cfg.data_width = 8;
    cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB | RT_SPI_NO_CS;
    cfg.max_hz = 1 * 1000 * 1000;
    spi_dev = (struct rt_spi_device *)rt_device_find(SPI_NAME);
    if (RT_NULL == spi_dev)
    {
        rt_kprintf("spi sample run failed! can't find %s device!\n", SPI_NAME);
        return;
    }
    rt_spi_configure(spi_dev, &cfg);
    rt_kprintf("%s send:\n", SPI_NAME);
    for (int i = 0; i < sizeof(sendbuf); i++)
    {
        rt_kprintf("%02x ", sendbuf[i]);
    }
    rt_spi_transfer(spi_dev, sendbuf, readbuf, sizeof(sendbuf));
    rt_kprintf("\n\n%s rcv:\n", SPI_NAME);
    for (int i = 0; i < sizeof(readbuf); i++)
    {
        if (readbuf[i] != sendbuf[i])
        {
            rt_kprintf("SPI test fail!!!\n");
            break;
        }
        else
            rt_kprintf("%02x ", readbuf[i]);
    }
    rt_kprintf("\n\n");
    rt_kprintf("SPI test end\n");
}

Compilation & Download

• RT-Thread Studio: In RT-Thread Studio’s package manager, download the EtherKit resource package, create a new project, and compile it.
• IAR: First, double-click mklinks.bat to create symbolic links between RT-Thread and the libraries folder. Then, use the Env tool to generate the IAR project. Finally, double-click project.eww to open the IAR project and compile it.

After compilation, connect the development board’s JLink interface to the PC and download the firmware to the development board.

Run Effect

When using a serial tool, you can observe that the data sent and received in the SPI loopback test matches: