帮我用keil5写一个历程 用stm32、PWM+DMA方法驱动sw2812显示自定义文字 用tim1 CH1通道
时间: 2024-06-08 16:10:50 浏览: 180
好的,首先你需要准备以下材料:
- STM32开发板
- SW2812 LED灯带
- Keil 5开发环境
- ST官方提供的HAL库
接下来按照以下步骤进行操作:
1. 在Keil 5中创建一个新的工程,选择STM32的型号以及对应的芯片型号。
2. 在工程中添加HAL库,具体操作步骤如下:
- 点击 "Project" -> "Manage" -> "Pack Installer"
- 在搜索栏中输入 "STM32CubeXX" (XX为你的芯片型号),选择对应的库并安装。
- 安装完成后,右键点击工程名称,选择 "Options for Target" 选项。
- 在 "C/C++" 选项卡中添加以下路径:
```
$(PACKAGES)/STMicroelectronics/STM32CubeXX/Drivers/STM32XX_HAL_Driver/Inc
$(PACKAGES)/STMicroelectronics/STM32CubeXX/Drivers/STM32XX_HAL_Driver/Src
```
其中,XX为你的芯片型号。
3. 在工程中添加头文件和宏定义,在main.c文件中添加以下内容:
```C
#include "stm32xx_hal.h"
#include <string.h>
#define LED_NUM 10 //LED灯数量
#define LED_DATA_SIZE 24 //每个LED需要24位数据
#define LED_TOTAL_SIZE (LED_NUM * LED_DATA_SIZE) //LED数据总长度
#define TIM_PERIOD 89 //定时器周期
#define FREQ 800000 //PWM频率
#define TIM_PRESCALER 0 //分频系数
#define TIM_PERIOD_CYCLE ((SystemCoreClock / FREQ / (TIM_PRESCALER + 1)) - 1) //计算定时器周期值
#define RED_LED 0xFF0000 //红色
#define GREEN_LED 0x00FF00 //绿色
#define BLUE_LED 0x0000FF //蓝色
#define TEXT_SIZE 10 //自定义文字大小
#define TEXT_WIDTH (TEXT_SIZE * 6) //计算文字宽度
#define TEXT_HEIGHT 8 //文字高度
const uint32_t TEXT_COLOR[3] = {RED_LED, GREEN_LED, BLUE_LED}; //文字颜色
uint8_t text[TEXT_WIDTH * TEXT_HEIGHT]; //存储自定义文字像素数据
uint8_t led_data[LED_TOTAL_SIZE]; //存储LED灯数据
```
4. 初始化GPIO和定时器,以及配置DMA。在main函数中添加以下代码:
```C
int main(void)
{
HAL_Init();
SystemClock_Config();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_TIM1_CLK_ENABLE();
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = GPIO_PIN_8;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
TIM_HandleTypeDef htim1;
htim1.Instance = TIM1;
htim1.Init.Prescaler = TIM_PRESCALER;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.Period = TIM_PERIOD_CYCLE;
htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim1.Init.RepetitionCounter = 0;
HAL_TIM_PWM_Init(&htim1);
TIM_OC_InitTypeDef sConfigOC;
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1);
HAL_TIM_Base_Start(&htim1);
HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_1, (uint32_t *)led_data, LED_TOTAL_SIZE);
__HAL_RCC_DMA1_CLK_ENABLE();
DMA_HandleTypeDef hdma_tim1_ch1;
hdma_tim1_ch1.Instance = DMA1_Channel2;
hdma_tim1_ch1.Init.Request = DMA_REQUEST_6;
hdma_tim1_ch1.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_tim1_ch1.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_tim1_ch1.Init.MemInc = DMA_MINC_ENABLE;
hdma_tim1_ch1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_tim1_ch1.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_tim1_ch1.Init.Mode = DMA_CIRCULAR;
hdma_tim1_ch1.Init.Priority = DMA_PRIORITY_HIGH;
HAL_DMA_Init(&hdma_tim1_ch1);
__HAL_LINKDMA(&htim1, hdma[TIM_DMA_ID_CC1], hdma_tim1_ch1);
HAL_NVIC_SetPriority(DMA1_Channel2_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel2_IRQn);
generate_text("HELLO", RED_LED); //生成自定义文字像素数据
while (1)
{
update_led_data(); //更新LED灯数据
HAL_Delay(50);
}
}
```
5. 编写生成自定义文字像素数据的函数generate_text(),代码如下:
```C
void generate_text(char *text_str, uint32_t color)
{
memset(text, 0, sizeof(text)); //清空数组
int len = strlen(text_str);
int index = 0;
for (int i = 0; i < len; i++)
{
for (int j = 0; j < TEXT_HEIGHT; j++)
{
uint8_t data = font[text_str[i] - 'A'][j];
for (int k = 0; k < TEXT_SIZE; k++)
{
if (data & (1 << (8 - k)))
{
int x = index + k;
int y = j;
int offset = (x + y * TEXT_WIDTH) * 3;
for (int l = 0; l < 8; l++)
{
led_data[offset++] = (color & 0xFF0000) >> 16;
led_data[offset++] = (color & 0x00FF00) >> 8;
led_data[offset++] = (color & 0x0000FF);
}
}
}
}
index += TEXT_SIZE;
}
}
```
6. 编写更新LED灯数据的函数update_led_data(),代码如下:
```C
void update_led_data()
{
static int count = 0;
for (int i = 0; i < LED_TOTAL_SIZE; i++)
{
led_data[i] = 0;
}
int offset = count % LED_NUM * LED_DATA_SIZE;
for (int i = 0; i < LED_DATA_SIZE; i += 3)
{
int x = offset + i;
led_data[x++] = 0xFF;
led_data[x++] = 0x00;
led_data[x++] = 0x00;
}
for (int i = 0; i < TEXT_WIDTH * TEXT_HEIGHT * 3; i += 3)
{
int x = offset + LED_DATA_SIZE + i;
led_data[x++] = text[i];
led_data[x++] = text[i + 1];
led_data[x++] = text[i + 2];
}
count++;
}
```
7. 最后,编译程序并下载到STM32开发板中进行测试。
以上就是使用Keil 5和STM32驱动SW2812 LED灯显示自定义文字的全部步骤。
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