小贝子编程

C语言 STM32F103 PWM与定时器和DMA为WS2812中断功能不断调用



我正试图为WS2812 led制作自己的驱动器，带有定时器生成的PWM和圆形DMA缓冲区，用于保存内存。我设法得到了正确的计时，然而，用逻辑分析仪观察信号时，我注意到两个主要的地方出错了:

  • 例如，应该发送72位，实际上只发送了27位。
  • 发送错误的数据，即使在有限的27位中也没有按正确的顺序发送。

这是否实际上与不断调用中断有关，我不完全确定。我猜这是问题所在，因为没有发送全部的比特，我也试图在中断中的任何一个上切换GPIO引脚，结果是引脚总是保持关闭，可能表明中断被连续调用，因此引脚没有足够的时间打开。我不确定是否有其他方法来测试中断发生的时间和时间间隔。

如果这确实是连续调用中断的情况，问题可能是什么?据我所知，我正在使用适当的回调函数，并且我的初始化是有序的。然而，我发现奇怪的部分是，每当我注释出DMA PWM停止功能时，它就开始正确地发送比特，即正确的数量和正确的顺序。如果连续调用中断，我认为这不会起作用，因为DMA缓冲区将不断被中断例程更改，这将导致错误的输出。我将感谢任何提示或建议!下面是代码:

c

#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "ws2812.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef htim2;
DMA_HandleTypeDef hdma_tim2_ch1;
/* USER CODE BEGIN PV */
uint8_t fbuffer[NUM_LEDS*3];
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_TIM2_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief  The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_TIM2_Init();
/* USER CODE BEGIN 2 */
//  if(sbyte & (1 << 7)) lh = 65;
//  else lh = 25;
fbuffer[0] = 255;
fbuffer[1] = 0;
fbuffer[2] = 0;
fbuffer[3] = 0;
fbuffer[4] = 0;
fbuffer[5] = 0;
fbuffer[6] = 0;
fbuffer[7] = 255;
fbuffer[8] = 0;
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
ws2812_show(fbuffer);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief TIM2 Initialization Function
* @param None
* @retval None
*/
static void MX_TIM2_Init(void)
{
/* USER CODE BEGIN TIM2_Init 0 */
/* USER CODE END TIM2_Init 0 */
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
/* USER CODE BEGIN TIM2_Init 1 */
/* USER CODE END TIM2_Init 1 */
htim2.Instance = TIM2;
htim2.Init.Prescaler = 0;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 89;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM2_Init 2 */
/* USER CODE END TIM2_Init 2 */
HAL_TIM_MspPostInit(&htim2);
}
/**
* Enable DMA controller clock
*/
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel5_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel5_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel5_IRQn);
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOD_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_RESET);
/*Configure GPIO pin : PA0 */
GPIO_InitStruct.Pin = GPIO_PIN_0;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

ws2812.c

#include "main.h"
#include "ws2812.h"
extern TIM_HandleTypeDef htim2;
extern DMA_HandleTypeDef hdma_tim2_ch1;
extern uint8_t fbuffer[NUM_LEDS*3];
uint16_t indby = 3;
uint32_t bcolors = 0;
uint8_t circbuffer[24] = {0};
uint8_t rd_flag = 0;
uint8_t in_flag = 0;
// Interrupt for when half of the DMA buffer is reached.
void HAL_TIM_PWM_PulseFinishedHalfCpltCallback(TIM_HandleTypeDef *htim)
{
if (htim->Instance == htim2.Instance) {
if(indby < NUM_LEDS*3) {
// Fill the first half of the DMA buffer
bcolors = (fbuffer[indby+1] << 16) | (fbuffer[indby] << 8) | fbuffer[indby+2];
for(uint8_t i = 23; i > 11; i--) {
if(bcolors & (1<<i)) circbuffer[23-i] = HT;
else circbuffer[23-i] = LT;
}
}
}
}
// Interrupt for when all of the DMA buffer is passed.
void HAL_TIM_PWM_PulseFinishedCallback(TIM_HandleTypeDef *htim)
{
if (htim->Instance == htim2.Instance) {
if(indby < NUM_LEDS*3) {
// Set the latter half of the DMA buffer
for(uint8_t i = 11; i > 0; i--) {
if(bcolors & (1<<i)) circbuffer[23-i] = HT;
else circbuffer[23-i] = LT;
}
if(bcolors & (1<<0)) circbuffer[23] = HT;
else circbuffer[23] = LT;
indby += 3;
//HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_0);
}
// Stop PWM if last LED bit reached.
else {
HAL_TIM_PWM_Stop_DMA(&htim2, TIM_CHANNEL_1);
rd_flag = 0;
}
}
}
uint8_t ws2812_show(uint8_t fbuffer[])
{
// State machine like switch to make sure the functions runs properly on
// consecutive calls
switch(0 ^ in_flag ^ (rd_flag<<1)) {
// Initialization state
case 0:
in_flag = 1;
rd_flag = 1;
bcolors = (fbuffer[1] << 16) | (fbuffer[0] << 8) | fbuffer[2];
for(uint8_t i = 23; i > 0; i--) {
if(bcolors & (1<<i)) circbuffer[23-i] = HT;
else circbuffer[23-i] = LT;
}
if(bcolors & (1<<0)) circbuffer[23] = HT;
else circbuffer[23] = LT;
HAL_TIM_PWM_Start_DMA(&htim2, TIM_CHANNEL_1, (uint32_t *)circbuffer, 24);
return 0;
break;
// Running state
case 3:
return 0;
break;
// Finished state
case 1:
in_flag = 0;
return 1;
break;
// Something is up state
case 2:
rd_flag = 0;
return 0;
break;
default:
return 0;
}
}

stm32f1xx_hal_msp.c

#include "main.h"
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
extern DMA_HandleTypeDef hdma_tim2_ch1;
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN TD */
/* USER CODE END TD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN Define */
/* USER CODE END Define */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN Macro */
/* USER CODE END Macro */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* External functions --------------------------------------------------------*/
/* USER CODE BEGIN ExternalFunctions */
/* USER CODE END ExternalFunctions */
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
void HAL_TIM_MspPostInit(TIM_HandleTypeDef *htim);
/**
* Initializes the Global MSP.
*/
void HAL_MspInit(void)
{
/* USER CODE BEGIN MspInit 0 */
/* USER CODE END MspInit 0 */
__HAL_RCC_AFIO_CLK_ENABLE();
__HAL_RCC_PWR_CLK_ENABLE();
/* System interrupt init*/
/** NOJTAG: JTAG-DP Disabled and SW-DP Enabled
*/
__HAL_AFIO_REMAP_SWJ_NOJTAG();
/* USER CODE BEGIN MspInit 1 */
/* USER CODE END MspInit 1 */
}
/**
* @brief TIM_Base MSP Initialization
* This function configures the hardware resources used in this example
* @param htim_base: TIM_Base handle pointer
* @retval None
*/
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
{
if(htim_base->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspInit 0 */
/* USER CODE END TIM2_MspInit 0 */
/* Peripheral clock enable */
__HAL_RCC_TIM2_CLK_ENABLE();
/* TIM2 DMA Init */
/* TIM2_CH1 Init */
hdma_tim2_ch1.Instance = DMA1_Channel5;
hdma_tim2_ch1.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_tim2_ch1.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_tim2_ch1.Init.MemInc = DMA_MINC_ENABLE;
hdma_tim2_ch1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma_tim2_ch1.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_tim2_ch1.Init.Mode = DMA_CIRCULAR;
hdma_tim2_ch1.Init.Priority = DMA_PRIORITY_LOW;
if (HAL_DMA_Init(&hdma_tim2_ch1) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(htim_base,hdma[TIM_DMA_ID_CC1],hdma_tim2_ch1);
/* TIM2 interrupt Init */
HAL_NVIC_SetPriority(TIM2_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM2_IRQn);
/* USER CODE BEGIN TIM2_MspInit 1 */
/* USER CODE END TIM2_MspInit 1 */
}
}
void HAL_TIM_MspPostInit(TIM_HandleTypeDef* htim)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(htim->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspPostInit 0 */
/* USER CODE END TIM2_MspPostInit 0 */
__HAL_RCC_GPIOA_CLK_ENABLE();
/**TIM2 GPIO Configuration
PA15     ------> TIM2_CH1
*/
GPIO_InitStruct.Pin = GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
__HAL_AFIO_REMAP_TIM2_PARTIAL_1();
/* USER CODE BEGIN TIM2_MspPostInit 1 */
/* USER CODE END TIM2_MspPostInit 1 */
}
}
/**
* @brief TIM_Base MSP De-Initialization
* This function freeze the hardware resources used in this example
* @param htim_base: TIM_Base handle pointer
* @retval None
*/
void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* htim_base)
{
if(htim_base->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspDeInit 0 */
/* USER CODE END TIM2_MspDeInit 0 */
/* Peripheral clock disable */
__HAL_RCC_TIM2_CLK_DISABLE();
/* TIM2 DMA DeInit */
HAL_DMA_DeInit(htim_base->hdma[TIM_DMA_ID_CC1]);
/* TIM2 interrupt DeInit */
HAL_NVIC_DisableIRQ(TIM2_IRQn);
/* USER CODE BEGIN TIM2_MspDeInit 1 */
/* USER CODE END TIM2_MspDeInit 1 */
}
}

如果需要，我可以稍后提供逻辑分析仪波形。

忘记重置字节计数变量indby。吸取这个教训，仔细检查你的代码!

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