RT Thread SPI设备使用

后记：

之前，我把SPI的片选在Cubemx中配置成了SPI_NSS。
现在我给它改为了GPIO_OUTPUT. 同时参考了别人的类似的一个操作无线模块(采用SPI设备驱动)的例子程序（清楚了RTT的系统API的调用流程）。
年初第一天上班，有空回过头来看这个问题，就成功解决了。

------Sx1278.h-----------------------------------------------------------------------------------------------------

#ifndef __SX1278_H__
#define __SX1278_H__

#include "drv_gpio.h"

struct spi_sx1278_device
{
struct rt_device sx1278_device;
struct rt_spi_device * rt_spi_device;
struct rt_mutex lock;
void * user_data;
};

typedef struct spi_sx1278_device * rt_spi_sx1278_device_t;

// 引脚定义
#define Sx1278_IRQ_PIN GET_PIN(C, 8)
#define Sx1278_nCS_PIN GET_PIN(B, 12)
#define Sx1278_RST_PIN GET_PIN(C, 9)

// 引脚状态
#define ST_SX1278_IRQ() rt_pin_read(Sx1278_IRQ_PIN)

// 引脚输出
#define SX1278_SPI_NCS_H() rt_pin_write(Sx1278_nCS_PIN, PIN_HIGH);
#define SX1278_SPI_NCS_L() rt_pin_write(Sx1278_nCS_PIN, PIN_LOW);

#define SX1278_SPI_RST_H() rt_pin_write(Sx1278_RST_PIN, PIN_HIGH);
#define SX1278_SPI_RST_L() rt_pin_write(Sx1278_RST_PIN, PIN_LOW);

typedef rt_uint8_t u8;
typedef rt_uint16_t u16;
typedef rt_uint32_t u32;

void test(void);

#endif

------Sx1278.c-----------------------------------------------------------------------------------------------------
#include "board.h"
#include "drv_spi.h"
#include "Sx1278.h"

#define SPI_BUS_NAME 　　　　　　　　"spi2"
#define SPI_SX1278_DEVICE_NAME　　 "spi20"

void hdr_callback(void *args)// 回调函数
{
char *a = args; // 获取参数
rt_kprintf("KEY_PIN down! %s\n",a);
}

//struct stm32_hw_spi_cs
//{
// rt_uint32_t pin;
//}; 不自己定义了，新的STM32 BSP 的drv_spi.h 有如下定义

// drv_spi.h 内定义：
//struct stm32_hw_spi_cs
//{
// GPIO_TypeDef* GPIOx;
// uint16_t GPIO_Pin;
//};
static struct stm32_hw_spi_cs spi_cs; /* SPI设备CS片选引脚 */

static struct spi_sx1278_device spi_sx1278_device;

#define CS_PIN 28 // Sx1278_nCS_PIN

static u8 SX1278_spiReadWriteByte(const u8 Sdata)
{
u8 Rdata[13] = {0};

// rt_pin_write(CS_PIN, PIN_LOW); /* 先低电平 */

// rt_spi_send_then_recv第一个形参：struct rt_spi_device *device;
rt_spi_send_then_recv( spi_sx1278_device.rt_spi_device, &Sdata, (rt_size_t)1, Rdata, (rt_size_t)1);

// rt_spi_send(spi_sx1278_device.rt_spi_device, &Sdata, 1);

return Rdata[0];
}

int rt_hw_spi2_config(const char * spi_device_name) // 这里填的就是"spi20"为参数。这里应该直接直接命名参数为const char * device name
{ // spi_device_name是spi总线设备的意思，对应的是"spi2"总线。
rt_err_t res;

struct rt_spi_device * rt_spi_device;

rt_pin_mode(CS_PIN, PIN_MODE_OUTPUT);

// 这个不用根据SPI设备名字来查找设备
//res = rt_spi_bus_attach_device(spi_sx1278_device.rt_spi_device, SPI_SX1278_DEVICE_NAME, SPI_BUS_NAME, (void*)&spi_cs);

spi_cs.GPIOx = GPIOB;
spi_cs.GPIO_Pin = GPIO_PIN_12;

// 这个要根据SPI设备名字来查找设备功能1：把spi20挂到spi2上
res = rt_hw_spi_device_attach(SPI_BUS_NAME, SPI_SX1278_DEVICE_NAME, spi_cs.GPIOx, spi_cs.GPIO_Pin);
if( res == RT_EOK )
{
rt_kprintf("\n rt_hw_spi_device_attach(), OK! \r\n");
}

rt_spi_device = (struct rt_spi_device *)rt_device_find(spi_device_name);

spi_sx1278_device.rt_spi_device = rt_spi_device;

if(spi_sx1278_device.rt_spi_device == RT_NULL)
　　rt_kprintf("\n Wrong ! \r\n");

/* config spi */
{
struct rt_spi_configuration cfg;
cfg.data_width = 8;
cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;
cfg.max_hz = 1 * 1000 *1000; /* 20M,SPI max 42MHz,ssd1351 4-wire spi */

res = rt_spi_configure(spi_sx1278_device.rt_spi_device, &cfg);

if( res == RT_EOK )
{
　　rt_kprintf("\n rt_spi_configure(), OK! \r\n");
}

}

return RT_EOK;
}

rt_err_t rt_hw_SX1278_config(const char * sx1278_device_name, const char * spi_device_name)
{
rt_hw_spi2_config(sx1278_device_name);

return RT_EOK;
}

static int rt_hw_SX1278_init(void)
{
// rt_hw_SX1278_config( "spi2", "spi20"); 参数填写错误
rt_hw_SX1278_config( "spi20", "spi2"); // 参数填写正确

// SX1278 部分
// IO 方向
rt_pin_mode(Sx1278_IRQ_PIN, PIN_MODE_INPUT_PULLUP);
rt_pin_mode(Sx1278_RST_PIN, PIN_MODE_OUTPUT);

// SX1278中断
rt_pin_attach_irq(Sx1278_IRQ_PIN, PIN_IRQ_MODE_FALLING, hdr_callback, (void*)"CallBack args"); // 绑定中断，下降沿模式，回调函数
rt_pin_irq_enable(Sx1278_IRQ_PIN, PIN_IRQ_DISABLE); // PIN_IRQ_DISABLE、PIN_IRQ_ENABLE

// IO初值设置
rt_pin_write(Sx1278_nCS_PIN, PIN_HIGH);
rt_pin_write(Sx1278_RST_PIN, PIN_HIGH);

return 0;
}
INIT_PREV_EXPORT(rt_hw_SX1278_init); /* 使用RT-Thread的组件自动初始化机制 */

u8 WirelessInit(u8 channel, u8 pa)
{
u8 result=0;

// SX1278_DisableInt();

// SX1278_SetLoRaPA(pa);
// SX1278_Init(channel); // 初始化
//
// sG_RfState = ST_RF_RECE; // 接收状态
//
// SX1278_EnableInt();

return result;
}

void Delay_1ms(u8 x)
{
//rt_thread_mdelay(x);
rt_thread_delay(x);
}

void SX1278_Reset(void)
{
static int sPowerUpFlag=1;

SX1278_SPI_RST_H();
Delay_1ms(2);

SX1278_SPI_RST_L(); // 至少100us
Delay_1ms(2);

SX1278_SPI_RST_H(); // 至少5ms
if(sPowerUpFlag)
{
sPowerUpFlag = 0;
Delay_1ms(12); // 第一次上电，延时时间长一点
}
else
{
Delay_1ms(7);
}
}

static u8 SX1278Read(u8 adr)
{
u8 tmp;

SX1278_SPI_NCS_L();

SX1278_spiReadWriteByte(adr); // Send address first
tmp = SX1278_spiReadWriteByte(0xFF);

SX1278_SPI_NCS_H();

return tmp;
}

void test(void)
{
u8 TempReg;

u8 timeOutCnt=0;

SX1278_Reset(); rt_thread_mdelay(500);

while(1)
{
TempReg = SX1278Read(0x06);

//rt_kprintf("Hard SPI TempReg = %d \r\n", TempReg);

rt_thread_delay(50);
}
}

RT Thread SPI设备 使用

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