用gd32f303 的spi作为从端,通过中断方式接收主端数据和向主端发送数据,写一个函数
时间: 2024-05-09 09:14:34 浏览: 9
好的,以下是一个使用GD32F303的SPI作为从端,通过中断方式接收主端数据和向主端发送数据的函数,你可以根据自己的需求进行适当的修改:
```c
#include "gd32f30x.h"
#define SPI_SLAVE_PIN_MISO GPIO_PIN_13
#define SPI_SLAVE_PIN_MOSI GPIO_PIN_15
#define SPI_SLAVE_PIN_SCK GPIO_PIN_14
#define SPI_SLAVE_PIN_CS GPIO_PIN_12
#define SPI_SLAVE_GPIO GPIOB
#define SPI_SLAVE_BUFFER_SIZE 128
uint8_t spi_slave_rx_buffer[SPI_SLAVE_BUFFER_SIZE];
uint8_t spi_slave_tx_buffer[SPI_SLAVE_BUFFER_SIZE];
uint8_t spi_slave_rx_index = 0;
uint8_t spi_slave_tx_index = 0;
void spi_slave_init(void)
{
rcu_periph_clock_enable(RCU_GPIOB);
rcu_periph_clock_enable(RCU_SPI0);
gpio_init(SPI_SLAVE_GPIO, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, SPI_SLAVE_PIN_MISO);
gpio_init(SPI_SLAVE_GPIO, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, SPI_SLAVE_PIN_MOSI | SPI_SLAVE_PIN_SCK | SPI_SLAVE_PIN_CS);
spi_parameter_struct spi_init_struct;
spi_struct_para_init(&spi_init_struct);
spi_init_struct.trans_mode = SPI_TRANSMODE_RECEIVEONLY;
spi_init_struct.device_mode = SPI_SLAVE;
spi_init_struct.frame_size = SPI_FRAMESIZE_8BIT;
spi_init_struct.clock_polarity_phase = SPI_CK_PL_LOW_PH_1EDGE;
spi_init_struct.nss = SPI_NSS_SOFT;
spi_init_struct.prescale = SPI_PSC_8;
spi_init(SPI0, &spi_init_struct);
spi_crc_polynomial_set(SPI0, 7);
nvic_irq_enable(SPI0_IRQn, 2, 0);
spi_i2s_interrupt_enable(SPI0, SPI_I2S_INT_TBE);
spi_i2s_interrupt_enable(SPI0, SPI_I2S_INT_RBNE);
spi_enable(SPI0);
}
void spi_slave_send_data(uint8_t data)
{
spi_slave_tx_buffer[spi_slave_tx_index++] = data;
if (spi_slave_tx_index >= SPI_SLAVE_BUFFER_SIZE)
{
spi_slave_tx_index = 0;
}
spi_i2s_data_transmit(SPI0, spi_slave_tx_buffer[spi_slave_tx_index]);
}
uint8_t spi_slave_receive_data(void)
{
uint8_t data = spi_slave_rx_buffer[spi_slave_rx_index++];
if (spi_slave_rx_index >= SPI_SLAVE_BUFFER_SIZE)
{
spi_slave_rx_index = 0;
}
return data;
}
void SPI0_IRQHandler(void)
{
if (spi_i2s_interrupt_flag_get(SPI0, SPI_I2S_INT_FLAG_RBNE))
{
spi_slave_rx_buffer[spi_slave_rx_index++] = spi_i2s_data_receive(SPI0);
if (spi_slave_rx_index >= SPI_SLAVE_BUFFER_SIZE)
{
spi_slave_rx_index = 0;
}
}
if (spi_i2s_interrupt_flag_get(SPI0, SPI_I2S_INT_FLAG_TBE))
{
spi_i2s_data_transmit(SPI0, spi_slave_tx_buffer[spi_slave_tx_index++]);
if (spi_slave_tx_index >= SPI_SLAVE_BUFFER_SIZE)
{
spi_slave_tx_index = 0;
}
}
}
```
该函数初始化了SPI从机的GPIO和SPI控制器,并启用了中断处理程序以便接收和发送数据。在主机发送数据时,数据将被存储在spi_slave_rx_buffer数组中,可以通过spi_slave_receive_data函数来获取它们。在主机要求从机发送数据时,数据将被存储在spi_slave_tx_buffer数组中,可以使用spi_slave_send_data函数来发送它们。注意,在发送和接收数据时,索引变量需要进行限制,以确保不会超出缓冲区的界限。