STM32编写dmx512的发送数据
时间: 2024-05-08 16:18:06 浏览: 11
以下是使用STM32编写DMX512发送数据的示例代码:
```c
#include "stm32f10x.h"
#define DMX_START_ADDRESS 1 // DMX起始地址
#define DMX_CHANNEL_COUNT 8 // 发送的DMX通道数
#define DMX_FRAME_SIZE 513 // DMX帧大小
uint8_t dmx_frame[DMX_FRAME_SIZE]; // DMX帧缓冲区
void dmx_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
// 使能GPIO时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
// 配置USART1的GPIO引脚为复用推挽输出模式
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// 配置USART1的GPIO引脚为输入模式
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// 使能USART1时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
// 配置USART1的波特率、字长、停止位、校验位等参数
USART_InitStructure.USART_BaudRate = 250000;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_2;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
// 配置USART1的中断优先级
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// 使能USART1的发送中断
USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
// 使能USART1
USART_Cmd(USART1, ENABLE);
}
void dmx_send_data(void)
{
static uint16_t dmx_channel_index = 0;
static uint16_t dmx_frame_index = 0;
// 发送DMX起始码
if (dmx_channel_index == 0)
{
USART_SendData(USART1, 0x00);
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
dmx_channel_index++;
}
// 发送DMX通道数据
if (dmx_channel_index >= DMX_START_ADDRESS && dmx_channel_index < DMX_START_ADDRESS + DMX_CHANNEL_COUNT)
{
USART_SendData(USART1, dmx_frame[dmx_channel_index]);
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
dmx_channel_index++;
}
// 发送DMX结束码
if (dmx_channel_index == DMX_START_ADDRESS + DMX_CHANNEL_COUNT)
{
USART_SendData(USART1, 0x00);
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
dmx_channel_index = 0;
dmx_frame_index++;
}
// 判断DMX帧是否发送完成
if (dmx_frame_index >= DMX_FRAME_SIZE)
{
dmx_frame_index = 0;
}
}
int main(void)
{
dmx_init();
while (1)
{
dmx_send_data();
}
}
void USART1_IRQHandler(void)
{
if (USART_GetITStatus(USART1, USART_IT_TXE) != RESET)
{
USART_ClearITPendingBit(USART1, USART_IT_TXE);
}
}
```
以上代码中,`dmx_init()`函数用于初始化USART1,并配置为DMX512的发送模式;`dmx_send_data()`函数用于发送DMX帧数据,根据DMX协议的规定,需要先发送起始码、然后依次发送每个通道的数据,最后发送结束码;`main()`函数中不断调用`dmx_send_data()`函数来发送DMX帧数据;USART1的中断处理函数`USART1_IRQHandler()`中不需要做任何处理,只需要清除发送完成中断标志位即可。请根据实际需求修改DMX起始地址、发送的DMX通道数、DMX帧大小等参数。