STM32平台下的TM1812驱动

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TM1812芯片的特性如下：
这里写图片描述

数据传输参数及时序：
这里写图片描述

在上图中一个串联了三个TM1812芯片，每个芯片控制四盏灯，每盏灯有R,G,B三种颜色，每种颜色有256(0xFF)阶灰度可调，及每个颜色用一个字节控制。发送完全部LED灯的数据后，发送RESET信号进行LED显示以及重新接收数据。

下面是我在STM32F030C8T6中的驱动，时钟频率48MHz。
tm1812.h的代码：

#ifndef __LED_TM1812_H__#define __LED_TM1812_H__  /* Define macro __LED_TM1812_H__ */#ifdef __cplusplusextern "C"{#endif#include <stdint.h>#define    TM1812_CHIP_NUMBER     (8)    /* TM1812 chip number */#define    ONE_RESOLUTION_SIZE    (TM1812_CHIP_NUMBER*4*3)  /* A row RGB LED bytes size, a TM1812 chip control 4 LEDs, a LED contain 3 bytes(R,G,B)*//* Data input channel */typedef enum{    DIN1,    DIN2,    DIN3,    DIN4,}DIN_t;/* Unipolar Return-to-zero code default low level, code 1， 1.25us */#define  DIN_BIT_1(GPIO_Type, GPIO_Pin)    do                                      \                                           {                                       \                                               GPIO_Type->BSRR = GPIO_Pin;         \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();                    \                                               GPIO_Type->BRR = GPIO_Pin;          \                                               __NOP();__NOP();__NOP();            \                                           }while(0)/* Unipolar Return-to-zero code default low level, code 0, 1.25us */#define  DIN_BIT_0(GPIO_Type, GPIO_Pin)    do                                      \                                           {                                       \                                               GPIO_Type->BSRR = GPIO_Pin;         \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();                    \                                               GPIO_Type->BRR = GPIO_Pin;          \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();__NOP();__NOP();__NOP();    \                                               __NOP();                            \                                           }while(0)void TM1812_LEDInit(void);void TM1812_DataPowerOn(void);void TM1812_DataPoweOff(void);int TM1812_WriteOneByte(DIN_t Din, uint8_t Data);int TM1812_Reset(DIN_t Din);int TM1812_TransmitData(DIN_t Din, const uint8_t* Data, uint32_t Size);void TM1812_Test(void);#ifdef __cplusplus}#endif#endif /* End define macro __LED_TM1812_H__ */

tm1812.c代码：

#include "stm32f0xx_hal.h"#include "led_tm1812.h"#include "usart.h"#include <string.h>#include "cmsis_os.h"#include <stdbool.h>/*** @Brief: execute nCount no operation, delay a short time** @Parameters: us, delay us** @Return: None**/static void DelayUs(uint32_t nUs){    uint32_t Index = 0;    uint32_t TmpIndex = 0;    for(Index = 0; Index < nUs; Index++)    {        for(TmpIndex = 0; TmpIndex < 7; TmpIndex++)        {            __NOP();        }    }}/*** @Brief: Init RGBLED tm1812 relative pins** @Parameters: None** @Return: None**/void TM1812_LEDInit(void){    /*      * DIN1   ---> PB4 (Output)     * DIN2   ---> PB5 (Output)     * DIN3   ---> PB10 (Output)     * DIN4   ---> PB2 (Output)     * LED_EN1 ---> PB6 (Output)     */    GPIO_InitTypeDef GPIO_InitStruct;    /* GPIO Clock Enable */    __HAL_RCC_GPIOB_CLK_ENABLE();    /*Configure GPIO pins : PB2 PB10 PB4 PB5 */    GPIO_InitStruct.Pin = GPIO_PIN_2 | GPIO_PIN_10 | GPIO_PIN_4 | GPIO_PIN_5;    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;    GPIO_InitStruct.Pull = GPIO_PULLDOWN;    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);    /*Configure GPIO pins : PB6 */    GPIO_InitStruct.Pin = GPIO_PIN_6;    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;    GPIO_InitStruct.Pull = GPIO_NOPULL;    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);    /* Configure GPIO pin default Output Level */    /* DIN1, DIN2, DIN3, DIN4 default is low level */    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_2 | GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_10, GPIO_PIN_RESET);    /* Power off TM1812 */    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);}/*** @Brief: Enable data input** @Parameter: None** @Return: None**/void TM1812_PowerOn(void){    /*     * LED_EN1 ---> PB6 (Output)     */    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);}/*** @Brief: Disable data input** @Parameter: None** @Return: None**/void TM1812_PowerOff(void){    /*     * LED_EN1 ---> PB6 (Output)     */    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);}/*** @Brief: Data transmit is used unipolar return to zero code** @Parameter: 1) Din, select data input port               2) Data, one byte data that would be transmitted** @Return: 1) 0, transmit successful            2) -1, data input port error**/int TM1812_WriteOneByte(DIN_t Din, uint8_t Data){    int BitIndex = 0;    switch(Din)    {     case DIN1:        for(BitIndex = 8*sizeof(Data)-1; BitIndex >= 0; BitIndex--)        {            if(Data & (0x01 << BitIndex))            {                DIN_BIT_1(GPIOB, GPIO_PIN_4);            }            else            {                DIN_BIT_0(GPIOB, GPIO_PIN_4);            }        }        break;     case DIN2:        for(BitIndex = 8*sizeof(Data)-1; BitIndex >= 0; BitIndex--)        {            if(Data & (0x01 << BitIndex))            {                DIN_BIT_1(GPIOB, GPIO_PIN_5);            }            else            {                DIN_BIT_0(GPIOB, GPIO_PIN_5);            }        }        break;     case DIN3:        for(BitIndex = 8*sizeof(Data)-1; BitIndex >= 0; BitIndex--)        {            if(Data & (0x01 << BitIndex))            {                DIN_BIT_1(GPIOB, GPIO_PIN_10);            }            else            {                DIN_BIT_0(GPIOB, GPIO_PIN_10);            }        }        break;     case DIN4:        for(BitIndex = 8*sizeof(Data)-1; BitIndex >= 0; BitIndex--)        {            if(Data & (0x01 << BitIndex))            {                DIN_BIT_1(GPIOB, GPIO_PIN_2);            }            else            {                DIN_BIT_0(GPIOB, GPIO_PIN_2);            }        }        break;     default:        return -1;    }    return 0;}/*** @Brief: Send a reset signal** @Parameter: Din, select data input port** @Return: 1) 0, send a reset signal successful            2) -1, data input port error**/int TM1812_Reset(DIN_t Din){    switch(Din)    {     case DIN1:         HAL_GPIO_WritePin(GPIOB, GPIO_PIN_4, GPIO_PIN_RESET);           DelayUs(24);         break;     case DIN2:         HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_RESET);          DelayUs(24);         break;     case DIN3:         HAL_GPIO_WritePin(GPIOB, GPIO_PIN_10, GPIO_PIN_RESET);           DelayUs(24);         break;     case DIN4:         HAL_GPIO_WritePin(GPIOB, GPIO_PIN_2, GPIO_PIN_RESET);           DelayUs(24);         break;     default:         return -1;    }    return 0;}/*** @Brief: Transmit LED data** @Parameter: 1) Din, data input port               2) Data, transmit data               3) Size, data size** @Return: 1) 0, transmit data successful            2) -1, data is null or data size illegal**/int TM1812_TransmitData(DIN_t Din, const uint8_t* Data, uint32_t Size){    int ByteIndex = 0;    if((NULL == Data) || (Size != ONE_RESOLUTION_SIZE))    {        return -1;    }    /* Disable all maskable interrupts */    taskDISABLE_INTERRUPTS();    for(ByteIndex = 0; ByteIndex < Size; ByteIndex++)    {        TM1812_WriteOneByte(Din, Data[ByteIndex]);    }    /* Enable microcontroller interrupts */    taskENABLE_INTERRUPTS();     TM1812_Reset(Din);    return 0;}/*** Brief: Test Led only**/void TM1812_Test(void){    uint8_t Data[ONE_RESOLUTION_SIZE] = {0};    uint32_t DataSize = sizeof(Data) / sizeof(Data[0]);    int DataIndex = 0;    static int ColorFlag = 1;    if(ColorFlag > 3)    {        ColorFlag = 1;    }    memset(Data, 0, DataSize);    for(DataIndex = 0; DataIndex < DataSize; DataIndex++)    {        if(1 == ColorFlag)  /* Red */        {            if(((DataIndex+1) % 3) != 1)            {                Data[DataIndex] = 0x00;            }            else            {                Data[DataIndex] = 0xFF;            }        }        else if(2 == ColorFlag)  /* Green */        {            if(((DataIndex+1) % 3) != 2)            {                Data[DataIndex] = 0x00;            }            else            {                Data[DataIndex] = 0xFF;            }        }        else if(3 == ColorFlag)   /* Blue */        {            if(((DataIndex+1) % 3) != 0)            {                Data[DataIndex] = 0x00;            }            else            {                Data[DataIndex] = 0xFF;            }        }        TM1812_TransmitData(DIN1, Data, DataSize);        TM1812_TransmitData(DIN2, Data, DataSize);        TM1812_TransmitData(DIN3, Data, DataSize);        TM1812_TransmitData(DIN4, Data, DataSize);    }    memset(Data, 0, DataSize);    for(DataIndex = DataSize - 1; DataIndex >= 0; DataIndex--)    {        if(1 == ColorFlag)  /* Red */        {            if(((DataIndex+1) % 3) != 1)            {                Data[DataIndex] = 0x00;            }            else            {                Data[DataIndex] = 0xFF;            }        }        else if(2 == ColorFlag)  /* Green */        {            if(((DataIndex+1) % 3) != 2)            {                Data[DataIndex] = 0x00;            }            else            {                Data[DataIndex] = 0xFF;            }        }        else if(3 == ColorFlag)   /* Blue */        {            if(((DataIndex+1) % 3) != 0)            {                Data[DataIndex] = 0x00;            }            else            {                Data[DataIndex] = 0xFF;            }        }        TM1812_TransmitData(DIN1, Data, DataSize);        TM1812_TransmitData(DIN2, Data, DataSize);        TM1812_TransmitData(DIN3, Data, DataSize);        TM1812_TransmitData(DIN4, Data, DataSize);    }    ColorFlag++;}

说明：该驱动程序连接了四排LED，每排串联了8个TM1812芯片，故分成了四个数据通道。

总结：TM1812适合做静态光源，不适合做动态显示，动态显示会出现不同芯片数据显示不同步（断层）现象。因为TM1812数据传输采取的是单极性归零码传输，是一种单线传输，芯片之间没有时钟线进行数据同步，数据线默认状态是低电平，而且在一定时间(大于8us)内没有传输数据就会自动复位，进入重新接收数据的状态，因此刷新频率较高并且在运动时，芯片之间数据不同步现象会非常明显。
这里写图片描述

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