SPI_FLAG_TRANS
时间: 2024-05-18 22:10:07 浏览: 11
SPI_FLAG_TRANS是SPI总线通信的传输标志位,它在Linux内核中定义在spi.h头文件中,表示数据传输的方式。当SPI_FLAG_TRANS标志位被设置为0时,表示采用SPI总线的传输方式,即全双工传输;当设置为1时,表示采用半双工传输方式。半双工传输的数据流向是单向的,即数据只能在一条通信线上单向传输,这种方式比全双工传输方式需要的通信线路更少,但是数据的传输速度也相应变慢。
相关问题
gd32f330spi主从配置
以下是gd32f330spi主从配置的示例代码:
1.主机配置
```c
#include "gd32f3x0_spi.h"
#include "gd32f3x0_gpio.h"
#define SPI0_SCK_PIN GPIO_PIN_10
#define SPI0_MISO_PIN GPIO_PIN_11
#define SPI0_MOSI_PIN GPIO_PIN_12
#define SPI0_NSS_PIN GPIO_PIN_13
#define SPI0_PORT GPIOA
void spi_master_init(void)
{
spi_parameter_struct spi_init_struct;
rcu_periph_clock_enable(RCU_GPIOA);
rcu_periph_clock_enable(RCU_SPI0);
gpio_init(SPI0_PORT, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, SPI0_SCK_PIN | SPI0_MOSI_PIN);
gpio_init(SPI0_PORT, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, SPI0_MISO_PIN);
gpio_init(SPI0_PORT, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, SPI0_NSS_PIN);
spi_struct_para_init(&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.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_struct.endian = SPI_ENDIAN_MSB;
spi_init(SPI0, &spi_init_struct);
spi_enable(SPI0);
}
uint8_t spi_master_send_receive(uint8_t data)
{
while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_TBE));
spi_i2s_data_transmit(SPI0, data);
while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_RBNE));
return spi_i2s_data_receive(SPI0);
}
```
2.从机配置
```c
#include "gd32f3x0_spi.h"
#include "gd32f3x0_gpio.h"
#define SPI0_SCK_PIN GPIO_PIN_10
#define SPI0_MISO_PIN GPIO_PIN_11
#define SPI0_MOSI_PIN GPIO_PIN_12
#define SPI0_NSS_PIN GPIO_PIN_13
#define SPI0_PORT GPIOA
void spi_slave_init(void)
{
spi_parameter_struct spi_init_struct;
rcu_periph_clock_enable(RCU_GPIOA);
rcu_periph_clock_enable(RCU_SPI0);
gpio_init(SPI0_PORT, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, SPI0_SCK_PIN | SPI0_MOSI_PIN);
gpio_init(SPI0_PORT, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, SPI0_MISO_PIN);
gpio_init(SPI0_PORT, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, SPI0_NSS_PIN);
spi_struct_para_init(&spi_init_struct);
spi_init_struct.device_mode = SPI_SLAVE;
spi_init_struct.trans_mode = SPI_TRANSMODE_FULLDUPLEX;
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_struct.endian = SPI_ENDIAN_MSB;
spi_init(SPI0, &spi_init_struct);
spi_enable(SPI0);
}
uint8_t spi_slave_send_receive(uint8_t data)
{
while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_TBE));
spi_i2s_data_transmit(SPI0, data);
while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_RBNE));
return spi_i2s_data_receive(SPI0);
}
```
GD32F303 spi例程
GD32F303是一款32位微控制器芯片,它支持SPI通信协议。以下是GD32F303 SPI例程的基本流程:
1. 配置SPI引脚:需要将SPI引脚配置为SPI模式。
2. 配置SPI参数:需要设置SPI的时钟极性、时钟相位、帧格式等参数。
3. 使能SPI:需要打开SPI时钟,并使能SPI功能。
4. 发送数据:通过SPI发送需要传输的数据。
5. 接收数据:通过SPI接收从外设返回的数据。
以下是一个简单的GD32F303 SPI例程示例:
```
#include "gd32f30x.h"
void spi_init(void)
{
/* 配置SPI引脚 */
rcu_periph_clock_enable(RCU_GPIOB);
gpio_init(GPIOB, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15);
/* 配置SPI参数 */
spi_parameter_struct spi_init_struct;
spi_i2s_deinit(SPI1);
spi_struct_para_init(&spi_init_struct);
spi_init_struct.trans_mode = SPI_TRANSMODE_FULLDUPLEX;
spi_init_struct.device_mode = SPI_MASTER;
spi_init_struct.frame_size = SPI_FRAMESIZE_8BIT;
spi_init_struct.clock_polarity_phase = SPI_CK_PL_HIGH_PH_2EDGE;
spi_init_struct.nss = SPI_NSS_SOFT;
spi_init(SPI1, &spi_init_struct);
/* 使能SPI */
spi_enable(SPI1);
}
uint8_t spi_transfer(uint8_t data)
{
/* 发送数据 */
while (RESET == spi_i2s_flag_get(SPI1, SPI_FLAG_TBE));
spi_i2s_data_transmit(SPI1, data);
/* 接收数据 */
while (RESET == spi_i2s_flag_get(SPI1, SPI_FLAG_RBNE));
return spi_i2s_data_receive(SPI1);
}
int main(void)
{
/* 初始化SPI */
spi_init();
/* 发送并接收数据 */
uint8_t tx_data = 0x01;
uint8_t rx_data = spi_transfer(tx_data);
while (1);
}
```