LED单元板驱动(HUB75接口)

开始之前先吐槽一下，搜这个的资料。要么都是Arduino，要么单片机的收费。小小的一个LED单元板，凭什么？

用Arduino是你速度快还是我ST，树莓派不好用？收费更离谱，这点东西还藏私？给你个中指凸。把原理都写出来看你怎么收费。

一、接口定义及原理

如图，有两个RGB通道，共占用6个IO。剩下的ABCDE为地址通道，LAT为行数据锁存通道，CLK为数据时钟，OE为低电平使能LED显示。图片这里没有E，证明它是16扫的，有E就会把B上面的地改为E。这样就是5位，2的5次方32扫。16扫控制16行显示，共2个RGB通道所以16扫可以控制16*2=32行显示。

（1）单元板的显示为单位时间内显示一行数据，然后短时间内切换到另一行显示，16扫一个显示周期为切换16次。

（2）两个RGB通道分别控制上下两部分的RGB灯。图片中的为32*16。正常来说，需要3个地址ABC，假设ABC 3个IO为高电平意味着选定第7行跟第15行，RGB1通道数据被写到第7行，RGB2数据被写到第15行。(我这个板子比较坑，有点不同)

（3）数据的写入顺序，失能LED显示，写入一行数据，选定行，锁存，使能LED显示。

（4）颜色渐变，方法是同一行扫描32次，假设R1我只显示一次，那它占空比就是1/32，显示次数越多越来亮。

这方法挺麻烦，但暂时没想到别的方法。

By the way：我这板子比较奇怪，数据写入方式跟一般的板子不一样。具体看图：

数据填充的时候，RBG1通道前8个时钟周期数据在第0行，接下来8个时钟周期数据却跳到第4行去了。然后又跳回第一行。

正常的应该是一直往同一行填充数据才对的。所以我买的这个板子比较奇葩。

二、驱动代码

使用单片机为STM32F407VE，STM32CUBEMX生成代码

#include "main.h"
#include "tim.h"
#include "gpio.h"void SystemClock_Config(void);#define OE_H   HAL_GPIO_WritePin(OE_GPIO_Port,OE_Pin,GPIO_PIN_SET)
#define R1_H   HAL_GPIO_WritePin(R1_GPIO_Port,R1_Pin,GPIO_PIN_SET)
#define R2_H   HAL_GPIO_WritePin(R2_GPIO_Port,R2_Pin,GPIO_PIN_SET)
#define G1_H   HAL_GPIO_WritePin(G1_GPIO_Port,G1_Pin,GPIO_PIN_SET)
#define G2_H   HAL_GPIO_WritePin(G2_GPIO_Port,G2_Pin,GPIO_PIN_SET)
#define B1_H   HAL_GPIO_WritePin(B1_GPIO_Port,B1_Pin,GPIO_PIN_SET)
#define B2_H   HAL_GPIO_WritePin(B2_GPIO_Port,B2_Pin,GPIO_PIN_SET)
#define A_H    HAL_GPIO_WritePin(A_GPIO_Port,A_Pin,GPIO_PIN_SET)
#define B_H    HAL_GPIO_WritePin(B_GPIO_Port,B_Pin,GPIO_PIN_SET)
#define CLK_H  HAL_GPIO_WritePin(CLK_GPIO_Port,CLK_Pin,GPIO_PIN_SET)
#define LAT_H  HAL_GPIO_WritePin(LAT_GPIO_Port,LAT_Pin,GPIO_PIN_SET)#define OE_L   HAL_GPIO_WritePin(OE_GPIO_Port,OE_Pin,GPIO_PIN_RESET)
#define R1_L   HAL_GPIO_WritePin(R1_GPIO_Port,R1_Pin,GPIO_PIN_RESET)
#define R2_L   HAL_GPIO_WritePin(R2_GPIO_Port,R2_Pin,GPIO_PIN_RESET)
#define G1_L   HAL_GPIO_WritePin(G1_GPIO_Port,G1_Pin,GPIO_PIN_RESET)
#define G2_L   HAL_GPIO_WritePin(G2_GPIO_Port,G2_Pin,GPIO_PIN_RESET)
#define B1_L   HAL_GPIO_WritePin(B1_GPIO_Port,B1_Pin,GPIO_PIN_RESET)
#define B2_L   HAL_GPIO_WritePin(B2_GPIO_Port,B2_Pin,GPIO_PIN_RESET)
#define A_L    HAL_GPIO_WritePin(A_GPIO_Port,A_Pin,GPIO_PIN_RESET)
#define B_L    HAL_GPIO_WritePin(B_GPIO_Port,B_Pin,GPIO_PIN_RESET)
#define CLK_L  HAL_GPIO_WritePin(CLK_GPIO_Port,CLK_Pin,GPIO_PIN_RESET)
#define LAT_L  HAL_GPIO_WritePin(LAT_GPIO_Port,LAT_Pin,GPIO_PIN_RESET)//此单元板4扫一次性输入2行数据，2个通道，故控制2*2*LED_ROW=16行
#define LED_ROW      4
//一行32个点
#define LED_COLUMN   32typedef struct
{uint16_t B:5;uint16_t G:5;uint16_t R:5;    uint16_t null:1;
}led_data;extern const unsigned char gImage_111[1024];
led_data *img_data = (led_data*)gImage_111;void delay(uint16_t time)
{uint16_t i,j;for(i=0;i<time;i++)for(j=0;j<100;j++);
}void led_DRamDis(led_data *pdata)
{uint16_t col_depth;uint16_t j,k,l;uint16_t row=0;uint16_t pos_down = LED_COLUMN*LED_ROW*2;  //指向LED下半部分数据起点if(pdata == NULL) return;for(row = 0;row<LED_ROW;row++)  //发送一扫数据{for(col_depth=0;col_depth<32;col_depth++) //每种颜色5bit，32种变化{OE_H;for(l=0;l<4;l++)   //一行4*8像素点数据{     for(k=0;k<2;k++)  //发送16像素点数据后，数据被续写{for(j=0;j<8;j++)   //发送8像素点数据后数据会跳转{           if(col_depth<pdata[j+row*32+32*LED_ROW*k+l*8].B) B1_H; else                                             B1_L; if(col_depth<pdata[j+row*32+32*LED_ROW*k+l*8].R) R1_H; else                                             R1_L; if(col_depth<pdata[j+row*32+32*LED_ROW*k+l*8].G) G1_H; else                                             G1_L; if(col_depth<pdata[j+row*32+pos_down+32*LED_ROW*k+l*8].B) B2_H; else                                                      B2_L; if(col_depth<pdata[j+row*32+pos_down+32*LED_ROW*k+l*8].R) R2_H; else                                                      R2_L; if(col_depth<pdata[j+row*32+pos_down+32*LED_ROW*k+l*8].G) G2_H; else                                                      G2_L;     CLK_L;CLK_H;            }                   }}//使能一行数据if(row&0x01) A_H;else         A_L;if(row&0x02) B_H;else         B_L;LAT_L;LAT_H;         OE_L;    delay(10); //短暂延时，让当前行数据显示一段时间}              }
}led_data img_data2[512];void RedDis(uint8_t r)
{uint16_t i;for(i=0;i<512;i++){img_data2[i].R = r;img_data2[i].G = 0;img_data2[i].B = 0;           }for(i=0;i<5;i++)led_DRamDis(img_data2);
}void BlueDis(uint8_t b)
{uint16_t i;for(i=0;i<512;i++){img_data2[i].R = 0;img_data2[i].G = 0;img_data2[i].B = b;           }for(i=0;i<5;i++)led_DRamDis(img_data2);
}void GreenDis(uint8_t g)
{uint16_t i;for(i=0;i<512;i++){img_data2[i].R = 0;img_data2[i].G = g;img_data2[i].B = 0;           }for(i=0;i<5;i++)led_DRamDis(img_data2);
}int main(void)
{uint16_t i;uint16_t *p;HAL_Init();SystemClock_Config();MX_GPIO_Init();MX_TIM7_Init();while (1){for(i=0;i<16;i++)RedDis(i);       for(i=0;i<16;i++)BlueDis(i);  for(i=0;i<16;i++)GreenDis(i);         for(i=0;i<100;i++)led_DRamDis(img_data);}
}void SystemClock_Config(void)
{RCC_OscInitTypeDef RCC_OscInitStruct = {0};RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};/** Configure the main internal regulator output voltage */__HAL_RCC_PWR_CLK_ENABLE();__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);/** Initializes the CPU, AHB and APB busses clocks */RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;RCC_OscInitStruct.HSEState = RCC_HSE_ON;RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;RCC_OscInitStruct.PLL.PLLM = 8;RCC_OscInitStruct.PLL.PLLN = 336;RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;RCC_OscInitStruct.PLL.PLLQ = 4;if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK){Error_Handler();}/** Initializes the CPU, AHB and APB busses 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_DIV4;RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK){Error_Handler();}
}void Error_Handler(void)
{}

图像数据数组采用Image2Lcd 2.9生成，搞单片机的人应该对此很熟悉。16位RBG555数据格式

const unsigned char gImage_111[1024] = { /* 0X00,0X10,0X20,0X00,0X10,0X00,0X00,0X1B, */
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};

三、效果图

改变每个RGB通道的占空比实现渐变（一行扫描32次），所以闪烁会严重些。

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