gd32f30x控制sx126x代码

gd32f30x是一款32位ARM Cortex-M4微控制器，而sx126x是一个低功耗、超远距离LoRa无线收发器。为了控制sx126x，需要使用SPI接口与gd32f30x通信。

以下是一个简单的gd32f30x控制sx126x的示例代码：

#include "gd32f30x.h"
#include "sx126x.h"

#define SX126X_SPI_PORT GPIOB
#define SX126X_SPI_SCK GPIO_PIN_3
#define SX126X_SPI_MISO GPIO_PIN_4
#define SX126X_SPI_MOSI GPIO_PIN_5
#define SX126X_SPI_NSS GPIO_PIN_6

void sx126x_spi_init(void)
{
    rcu_periph_clock_enable(RCU_GPIOB);
    gpio_init(SX126X_SPI_PORT, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, SX126X_SPI_SCK | SX126X_SPI_MOSI);
    gpio_init(SX126X_SPI_PORT, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, SX126X_SPI_MISO);
    gpio_init(SX126X_SPI_PORT, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, SX126X_SPI_NSS);
    spi_parameter_struct spi_struct;
    rcu_periph_clock_enable(RCU_SPI0);
    spi_struct.trans_mode = SPI_TRANSMODE_FULLDUPLEX;
    spi_struct.device_mode = SPI_MASTER;
    spi_struct.frame_size = SPI_FRAMESIZE_8BIT;
    spi_struct.clock_polarity_phase = SPI_CK_PL_HIGH_PH_2EDGE;
    spi_struct.nss = SPI_NSS_SOFT;
    spi_struct.prescale = SPI_PSC_2;
    spi_struct.endian = SPI_ENDIAN_MSB;
    spi_init(SPI0, &spi_struct);
    spi_enable(SPI0);
}

void sx126x_spi_select(void)
{
    gpio_bit_reset(SX126X_SPI_PORT, SX126X_SPI_NSS);
}

void sx126x_spi_deselect(void)
{
    gpio_bit_set(SX126X_SPI_PORT, SX126X_SPI_NSS);
}

uint8_t sx126x_spi_read_write_byte(uint8_t tx_data)
{
    while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_TBE));
    spi_i2s_data_transmit(SPI0, tx_data);
    while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_RBNE));
    return spi_i2s_data_receive(SPI0);
}

int main(void)
{
    sx126x_spi_init();
    sx126x_init(sx126x_spi_select, sx126x_spi_deselect, sx126x_spi_read_write_byte);
    // TODO: 进行sx126x的初始化和控制操作
    return 0;
}

在上面的代码中，我们首先定义了sx126x的SPI接口引脚，然后通过函数`sx126x_spi_init()`初始化SPI接口。接着，我们定义了一些用于控制sx126x的SPI操作函数，包括`sx126x_spi_select()`、`sx126x_spi_deselect()`和`sx126x_spi_read_write_byte()`。最后，我们在`main()`函数中调用了`sx126x_init()`函数进行sx126x的初始化，然后可以根据需要进行sx126x的控制操作。