digital_led.c

MAX7219控制数码管显示程序

#include "..\..\includes.h"

#if CFG_DIGITAL_LED_EN > 0

static void Digital_LED_WriteRAM( INT8U addressRAM, INT8U value );
static void Digital_LED_WriteReg( INT8U reg, INT8U value );
static void MAX7219_Write( INT8U address, INT8U value );
static void MAX7219_SendByte( INT8U value );

/**********************************************************************************
*                  ASCII to SEVEN-SEGMENT conversion table
*                                                             a
*                                                           ------
*                                                        f |      | b
*                                                          |  g   |
* Note: The segments are mapped as follows:                 ------
*                                                        e |      | c
*        a    b    c    d    e    f    g                   |  d   |
*        --   --   --   --   --   --   --   --              ------
*        B7   B6   B5   B4   B3   B2   B1   B0
**********************************************************************************/
static INT8U code DispASCIItoSegTbl[] = {     /* ASCII to SEVEN-SEGMENT conversion table                      */
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,
    0x00,                              /* ' '                                                          */
    0x00,                              /* '!', No seven-segment conversion for exclamation point       */
    0x44,                              /* '"', Double quote                                            */
    0x00,                              /* '#', Pound sign                                              */
    0x00,                              /* '$', No seven-segment conversion for dollar sign             */
    0x00,                              /* '%', No seven-segment conversion for percent sign            */
    0x00,                              /* '&', No seven-segment conversion for ampersand               */
    0x40,                              /* ''', Single quote                                            */
    0x9C,                              /* '(', Same as '['                                             */
    0xF0,                              /* ')', Same as ']'                                             */
    0x00,                              /* '*', No seven-segment conversion for asterix                 */
    0x00,                              /* '+', No seven-segment conversion for plus sign               */
    0x00,                              /* ',', No seven-segment conversion for comma                   */
    0x02,                              /* '-', Minus sign                                              */
    0x01,                              /* '.', No seven-segment conversion for period                  */
    0x00,                              /* '/', No seven-segment conversion for slash                   */
    0xFC,                              /* '0'                                                          */
    0x60,                              /* '1'                                                          */
    0xDA,                              /* '2'                                                          */
    0xF2,                              /* '3'                                                          */
    0x66,                              /* '4'                                                          */
    0xB6,                              /* '5'                                                          */
    0xBE,                              /* '6'                                                          */
    0xE0,                              /* '7'                                                          */
    0xFE,                              /* '8'                                                          */
    0xF6,                              /* '9'                                                          */
    0x00,                              /* ':', No seven-segment conversion for colon                   */
    0x00,                              /* ';', No seven-segment conversion for semi-colon              */
    0x00,                              /* '<', No seven-segment conversion for less-than sign          */
    0x12,                              /* '=', Equal sign                                              */
    0x00,                              /* '>', No seven-segment conversion for greater-than sign       */
    0xCA,                              /* '?', Question mark                                           */
    0x00,                              /* '@', No seven-segment conversion for commercial at-sign      */
    0xEE,                              /* 'A'                                                          */
    0x3E,                              /* 'B', Actually displayed as 'b'                               */
    0x9C,                              /* 'C'                                                          */
    0x7A,                              /* 'D', Actually displayed as 'd'                               */
    0x9E,                              /* 'E'                                                          */
    0x8E,                              /* 'F'                                                          */
    0xBC,                              /* 'G', Actually displayed as 'g'                               */
    0x6E,                              /* 'H'                                                          */
    0x60,                              /* 'I', Same as '1'                                             */
    0x78,                              /* 'J'                                                          */
    0x00,                              /* 'K', No seven-segment conversion                             */
    0x1C,                              /* 'L'                                                          */
    0x00,                              /* 'M', No seven-segment conversion                             */
    0x2A,                              /* 'N', Actually displayed as 'n'                               */
    0xFC,                              /* 'O', Same as '0'                                             */
    0xCE,                              /* 'P'                                                          */
    0x00,                              /* 'Q', No seven-segment conversion                             */
    0x0A,                              /* 'R', Actually displayed as 'r'                               */
    0xB6,                              /* 'S', Same as '5'                                             */
    0x1E,                              /* 'T', Actually displayed as 't'                               */
    0x7C,                              /* 'U'                                                          */
    0x00,                              /* 'V', No seven-segment conversion                             */
    0x00,                              /* 'W', No seven-segment conversion                             */
    0x00,                              /* 'X', No seven-segment conversion                             */
    0x76,                              /* 'Y'                                                          */
    0x00,                              /* 'Z', No seven-segment conversion                             */
    0x00,                              /* '['                                                          */
    0x00,                              /* '\', No seven-segment conversion                             */
    0x00,                              /* ']'                                                          */
    0x00,                              /* '^', No seven-segment conversion                             */
    0x00,                              /* '_', Underscore                                              */
    0x00,                              /* '`', No seven-segment conversion for reverse quote           */
    0xFA,                              /* 'a'                                                          */
    0x3E,                              /* 'b'                                                          */
    0x1A,                              /* 'c'                                                          */
    0x7A,                              /* 'd'                                                          */
    0xDE,                              /* 'e'                                                          */
    0x8E,                              /* 'f', Actually displayed as 'F'                               */
    0xBC,                              /* 'g'                                                          */
    0x2E,                              /* 'h'                                                          */
    0x20,                              /* 'i'                                                          */
    0x78,                              /* 'j', Actually displayed as 'J'                               */
    0x00,                              /* 'k', No seven-segment conversion                             */
    0x1C,                              /* 'l', Actually displayed as 'L'                               */
    0x00,                              /* 'm', No seven-segment conversion                             */
    0x2A,                              /* 'n'                                                          */
    0x3A,                              /* 'o'                                                          */
    0xCE,                              /* 'p', Actually displayed as 'P'                               */
    0x00,                              /* 'q', No seven-segment conversion                             */
    0x0A,                              /* 'r'                                                          */
    0xB6,                              /* 's', Actually displayed as 'S'                               */
    0x1E,                              /* 't'                                                          */
    0x38,                              /* 'u'                                                          */
    0x00,                              /* 'v', No seven-segment conversion                             */
    0x00,                              /* 'w', No seven-segment conversion                             */
    0x00,                              /* 'x', No seven-segment conversion                             */
    0x76,                              /* 'y', Actually displayed as 'Y'                               */
    0x00                               /* 'z', No seven-segment conversion                             */
};


//--------------------------------------------------------------
// 初始化数码管
//--------------------------------------------------------------
void Digital_LED_Init( void )
{
#if OS_CRITICAL_METHOD == 3
      OS_CPU_SR   cpu_sr;
#endif
      
      OS_ENTER_CRITICAL();
      
	// 确定数码管的个数
	Digital_LED_WriteReg( SCAN_LIMIT_REG, MAX_DIGITAL_LED_NUM-1 );
	
	// 设置数码管的亮度
	Digital_LED_WriteReg( INTENSITY_ADJUST_REG, 2 );
	
	// 选择译码方式
	Digital_LED_WriteReg( DECODE_MODE_REG, 0x00 );
	
	// 选择正常工作状态