GD32F303 软件SPI参考例程
时间: 2023-10-17 22:05:31 浏览: 48
以下是针对GD32F303芯片的软件SPI参考例程:
1. 初始化SPI接口
```c
void spi_init(void)
{
/* Enable SPI clock */
rcu_periph_clock_enable(RCU_SPI0);
/* Configure SPI pins */
gpio_init(GPIOA, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_5);
gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_6 | GPIO_PIN_7);
/* Configure SPI parameters */
spi_parameter_struct spi_init_struct;
spi_init_struct.device_mode = SPI_MASTER;
spi_init_struct.trans_mode = SPI_TRANSMODE_FULLDUPLEX;
spi_init_struct.frame_size = SPI_FRAMESIZE_8BIT;
spi_init_struct.nss = SPI_NSS_SOFT;
spi_init_struct.clock_polarity_phase = SPI_CK_PL_HIGH_PH_2EDGE;
spi_init_struct.prescale = SPI_PSC_8;
spi_init_struct.endian = SPI_ENDIAN_MSB;
spi_init(SPI0, &spi_init_struct);
spi_enable(SPI0);
}
```
2. 发送数据
```c
void spi_send_byte(uint8_t data)
{
/* Configure CS pin */
gpio_bit_reset(GPIOA, GPIO_PIN_5);
/* Wait for SPI to be ready */
while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_TBE));
/* Send data */
spi_i2s_data_transmit(SPI0, data);
/* Wait for data to be sent */
while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_RBNE));
/* Read data to clear flag */
spi_i2s_data_receive(SPI0);
/* Deassert CS pin */
gpio_bit_set(GPIOA, GPIO_PIN_5);
}
```
3. 接收数据
```c
uint8_t spi_receive_byte(void)
{
/* Configure CS pin */
gpio_bit_reset(GPIOA, GPIO_PIN_5);
/* Wait for SPI to be ready */
while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_TBE));
/* Send dummy byte to initiate read */
spi_i2s_data_transmit(SPI0, 0xFF);
/* Wait for data to be received */
while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_RBNE));
/* Read received data */
uint8_t data = spi_i2s_data_receive(SPI0);
/* Deassert CS pin */
gpio_bit_set(GPIOA, GPIO_PIN_5);
return data;
}
```
4. 发送和接收多个字节
```c
void spi_transfer(uint8_t *tx_buf, uint8_t *rx_buf, uint16_t len)
{
/* Configure CS pin */
gpio_bit_reset(GPIOA, GPIO_PIN_5);
while (len--)
{
/* Wait for SPI to be ready */
while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_TBE));
/* Send data */
spi_i2s_data_transmit(SPI0, *tx_buf++);
/* Wait for data to be received */
while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_RBNE));
/* Read received data */
*rx_buf++ = spi_i2s_data_receive(SPI0);
}
/* Deassert CS pin */
gpio_bit_set(GPIOA, GPIO_PIN_5);
}
```
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