[MCU] 【国民技术N32G457评测】RT_Thread Studuio SPI发送数据失败

lugl4313820 2022-2-6 22:19 楼主

【国民技术N32G457评测】SPI收发评测 - 国产芯片交流 - 电子工程世界-论坛 (eeworld.com.cn)

用MDK测试SPI收发通过，晚上用RT_Thread Studio 来创建SPI发送数据。

挂载spi10设备成功后，用rt_spi_send发送数据，用逻辑分析仪采集数据，发现在NSS没有作用。时钟如下：

查看设备是有的：

测试的代码为：

#include "rtthread.h"
#include "drv_gpio.h"
#include <rtdevice.h>
#include "n32g45x_rcc.h"
#include "n32g45x.h"

#define SPI1_BUS_NAME         "spi1"
#define SPI1__DEVICE_NAME     "spi10"
#define SPI1_NCS_PIN 29
/*
N32G45XV SPI1 default GPIOs
    PA4------SPI0NSS
    PA5------SPI0SCK
    PA6------SPI0MISO
    PA7------SPI0MOSI
*/

struct n32_hw_spi_cs
{
    rt_uint32_t pin;
};



int rt_hw_spi_config(void)
{
    static struct rt_spi_device spi_dev_1;
    static struct n32_hw_spi_cs  spi_cs1;
    rt_err_t res;
    spi_cs1.pin = SPI1_NCS_PIN;
    rt_pin_mode(spi_cs1.pin, PIN_MODE_OUTPUT);
    rt_pin_write(SPI1_NCS_PIN, PIN_HIGH);

    res = rt_spi_bus_attach_device(&spi_dev_1, SPI1__DEVICE_NAME, SPI1_BUS_NAME, (void*)&spi_cs1);
    if (res != RT_EOK)
    {
        rt_kprintf("rt_spi_bus_attach_device!\r\n");
        return res;
    }
    spi_dev_1.bus->owner = &spi_dev_1;
    {
        struct rt_spi_configuration cfg;
        cfg.data_width = 8;
        cfg.mode =  RT_SPI_MODE_MASK | RT_SPI_MODE_1 | RT_SPI_MSB ;
        cfg.max_hz = 1*1000 *1000; /* 40M,SPI max 42MHz, 3-wire spi */
        if(spi_dev_1.bus->owner==RT_NULL)
        {
            rt_kprintf("RT_OK\r\n");
        }
        rt_kprintf("owner= %d\r\n",*spi_dev_1.bus->owner);
        res = rt_spi_configure(&spi_dev_1, &(cfg));
        if(res != RT_EOK)
        {
            rt_kprintf("configure spi1 ERR!\r\n");
        }

    }
    return RT_EOK;
}

INIT_DEVICE_EXPORT(rt_hw_spi_config);


void spi1_test(void)
{
    struct rt_spi_device *spi_dev_master;
    rt_uint8_t tx[5] = {1,2,3,4,5};
    rt_uint8_t rx[5] = {0};
    rt_size_t  rx_recv;
    spi_dev_master = (struct rt_spi_device *)rt_device_find(SPI1__DEVICE_NAME);
    if(!&spi_dev_master)
    {
        rt_kprintf("spi1 test run failed! can't find %s device!\n", SPI1__DEVICE_NAME);
    }
    rt_pin_write(SPI1_NCS_PIN,PIN_LOW);
    rx_recv = rt_spi_send(spi_dev_master, &tx, 5);
    rt_pin_write(SPI1_NCS_PIN,PIN_HIGH);

}

我看了时序，NSS没有拉低，于是手工拉低NSS：

然后时钟也有了：

显然MOSI的数据不对。