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TI官方自带的驱动程序。 LCDM1 = LCD_Char_Map[hun_thou] & 0xFF; // Lower byte
LCDM2 = (LCD_Char_Map[hun_thou] >> 8) & 0xFF; // Upper byte
这两句是什么意思？ 右移了8位。不是全部为零了吗？怎么把一个数分为了 lower byte 和upper byte了呢？求解！
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//******************************************************************************
// MSP430F67791 Demo - LCD_C, Display 6 digit numbers
//
// Description: Displays "000000" to "999999" in sequence on the LCD.
// ACLK = REF0 = 32Khz, MCLK = SMCLK = DCO = Default
//
// MSP430F67791
// -----------------
// /|\| |
// | | |
// --|RST |
// | | TI LCD
// | S0 | -----------------
// | - |--> | + 5 4 3 2 1 0 |
// | S23 | -----------------
// | COM0|-----||||
// | COM1|------|||
// | COM2|-------||
// | COM3|--------|
// | |
//
//
// C. Fu
// Texas Instruments Inc.
// October 2012
// Built with CCS Version: 5.1.0 and IAR Embedded Workbench Version: 5.51
//******************************************************************************
#include <msp430.h>
// LCD Segment Mapping
const unsigned char LCD_Char_Map[] =
{
BIT2 | BIT3 | BIT4 | BIT5 | BIT6 | BIT7, // '0' or 'O'
BIT5 | BIT6, // '1' or 'I'
BIT0 | BIT1 | BIT3 | BIT4 | BIT6 | BIT7, // '2' or 'Z'
BIT0 | BIT1 | BIT4 | BIT5 | BIT6 | BIT7, // '3'
BIT0 | BIT1 | BIT2 | BIT5 | BIT6, // '4' or 'y'
BIT0 | BIT1 | BIT2 | BIT4 | BIT5 | BIT7, // '5' or 'S'
BIT0 | BIT1 | BIT2 | BIT3 | BIT4 | BIT5 | BIT7, // '6' or 'b'
BIT5 | BIT6 | BIT7, // '7'
BIT0 | BIT1 | BIT2 | BIT3 | BIT4 | BIT5 | BIT6 | BIT7, // '8' or 'B'
BIT0 | BIT1 | BIT2 | BIT4 | BIT5 | BIT6 | BIT7, // '9' or 'g'
};
char hun_thou, ten_thou, thou, hun, ten, unit;
void main(void)
{
volatile unsigned char i;
WDTCTL = WDTPW | WDTHOLD; // Stop WDT
// Setup LCD_C
// LCD_FREQ = ACLK/32/4, LCD Mux 4, turn on LCD
LCDCCTL0 = LCDDIV_31 | LCDPRE_1 | LCD4MUX | LCDON;
//Charge pump generated internally at 2.96V, external bias (V2-V4) generation
//Internal reference for charge pump
LCDCVCTL = LCDCPEN | VLCD_2_96;
REFCTL0 &= ~REFMSTR;
LCDCPCTL0 = 0xFFFF; //Select LCD Segments 0-23
LCDCPCTL1 = 0x00FF; //
while (1)
{
for (hun_thou=0; hun_thou<=9; hun_thou++)
{
for (ten_thou=0; ten_thou<=9; ten_thou++)
{
for (thou =0; thou<=9; thou++)
{
for (hun=0; hun<=9; hun++)
{
for (ten=0; ten<=9; ten++)
{
for (unit=0; unit<=9; unit++)
{
LCDM1 = LCD_Char_Map[hun_thou] & 0xFF; // Lower byte
LCDM2 = (LCD_Char_Map[hun_thou] >> 8) & 0xFF; // Upper byte
LCDM3 = LCD_Char_Map[ten_thou] & 0xFF; // Lower byte
LCDM4 = (LCD_Char_Map[ten_thou] >> 8) & 0xFF; // Upper byte
LCDM5 = LCD_Char_Map[thou] & 0xFF; // Lower byte
LCDM6 = (LCD_Char_Map[thou] >> 8) & 0xFF; // Upper byte
LCDM7 = LCD_Char_Map[hun] & 0xFF; // Lower byte
LCDM8 = (LCD_Char_Map[hun] >> 8) & 0xFF; // Upper byte
LCDM9 = LCD_Char_Map[ten] & 0xFF; // Lower byte
LCDM10 = (LCD_Char_Map[ten] >> 8) & 0xFF; // Upper byte
LCDM11 = LCD_Char_Map[unit] & 0xFF; // Lower byte
LCDM12 = (LCD_Char_Map[unit] >> 8) & 0xFF; // Upper byte
__delay_cycles(500000);
}
}
}
}
}
}
}//Display the number's digits on the LCD
} |
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发表于 2014-6-3 10:15:35
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