用c语言在stm32上实现：图像灰度化

以下是在STM32上使用C语言实现图像灰度化的示例代码：

#include "stm32f4xx.h"
#include "stm32f4xx_hal_gpio.h"
#include "stm32f4xx_hal_dma.h"
#include "stm32f4xx_hal_adc.h"

#define ROWS 128
#define COLS 128

uint8_t image[ROWS][COLS]; // 原始图像
uint8_t gray_image[ROWS][COLS]; // 灰度图像

void ADC_Configuration(void)
{
    // 设置ADC通道、采样时间和分辨率
    ADC_ChannelConfTypeDef sConfig;
    ADC_HandleTypeDef adc_handle;
    adc_handle.Instance = ADC1;
    adc_handle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
    adc_handle.Init.Resolution = ADC_RESOLUTION_12B;
    adc_handle.Init.ScanConvMode = DISABLE;
    adc_handle.Init.ContinuousConvMode = ENABLE;
    adc_handle.Init.DiscontinuousConvMode = DISABLE;
    adc_handle.Init.NbrOfDiscConversion = 0;
    adc_handle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIG_EDGE_NONE;
    adc_handle.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_CC1;
    adc_handle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
    adc_handle.Init.NbrOfConversion = 1;
    HAL_ADC_Init(&adc_handle);
    sConfig.Channel = ADC_CHANNEL_0;
    sConfig.Rank = 1;
    sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
    HAL_ADC_ConfigChannel(&adc_handle, &sConfig);
}

void DMA_Configuration(void)
{
    // 设置DMA传输
    DMA_HandleTypeDef dma_handle;
    dma_handle.Instance = DMA2_Stream0;
    dma_handle.Init.Channel = DMA_CHANNEL_0;
    dma_handle.Init.Direction = DMA_PERIPH_TO_MEMORY;
    dma_handle.Init.PeriphInc = DMA_PINC_DISABLE;
    dma_handle.Init.MemInc = DMA_MINC_ENABLE;
    dma_handle.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
    dma_handle.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
    dma_handle.Init.Mode = DMA_CIRCULAR;
    dma_handle.Init.Priority = DMA_PRIORITY_HIGH;
    dma_handle.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    HAL_DMA_Init(&dma_handle);
    __HAL_LINKDMA(&adc_handle, DMA_Handle, dma_handle);
    HAL_DMA_Start(&dma_handle, (uint32_t)&ADC1->DR, (uint32_t)image, ROWS*COLS);
}

void GrayScale(void)
{
    // 将RGB图像转换为灰度图像
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            gray_image[i][j] = (image[i][j*3] + image[i][j*3+1] + image[i][j*3+2])/3;
        }
    }
}

int main(void)
{
    HAL_Init();
    ADC_Configuration();
    DMA_Configuration();
    while (1) {
        GrayScale();
    }
}

以上代码使用ADC和DMA从STM32上的相机读取原始图像。然后，将RGB图像转换为灰度图像，并将其存储在gray_image数组中。

注：本示例代码中的ADC和DMA配置只是示例，实际使用时需要根据相机硬件进行配置。