MSP430 LCD控制器解释

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MSP430 LCD控制器解释 [复制链接]

CC430F613x的LCD控制器最多能控制160段。

The LCD_B controller features are:
• Display memory
• Automatic signal generation
• Configurable frame frequency
• Blinking of individual segments with separate blinking memory
• Regulated charge pump
• Contrast control by software
• Support for four types of LCDs
– Static
– 2-mux, 1/2 bias or 1/3 bias
– 3-mux, 1/2 bias or 1/3 bias
– 4-mux, 1/2 bias or 1/3 bias

把每一段映射到一个位（bit）,比如LCDM1的每一个位（bit）都对应一个段。这样有20个寄存器每个有8个位，所以能映射20*8=160段。

上图是个静态驱动示意图，所谓静态就是只有一个公共端（COM0），这样公共端就不需要切换了。

[cpp] view plain copy

• //******************************************************************************  
• //  eZ430 chronos hello world  
• //  Description: initializes lcd module and shows the string 'hi earth' on the  
• //               lcd display becuase 'hello world' is too long  
• //  Author: Felix Genicio  
• //******************************************************************************  
•   
• #include  "cc430x613x.h"  
• #include   
•   
• void main(void)  
• {  
•     unsigned char * lcdmem;  
•   
•     // Clear entire display memory  
•     LCDBMEMCTL |= LCDCLRBM + LCDCLRM;//清除LCD闪烁内存、清除LCD内存  
•   
•     // LCD_FREQ = ACLK/16/8 = 256Hz，其中ACLK=32768Hz  
•     // Frame frequency = 256Hz/4 = 64Hz, LCD mux 4, LCD on  
•     LCDBCTL0 = (LCDDIV0 + LCDDIV1 + LCDDIV2 + LCDDIV3) | (LCDPRE0 + LCDPRE1) | LCD4MUX | LCDON;  
•   
•     // LCB_BLK_FREQ = ACLK/8/4096 = 1Hz ,闪烁失能  
•     LCDBBLKCTL = (LCDBLKDIV0 + LCDBLKDIV1 + LCDBLKDIV2)|(LCDBLKPRE0 + LCDBLKPRE1) |  LCDBLKMOD0;  
•   
•     // I/O to COM outputs  
•     P5SEL |= (BIT5 | BIT6 | BIT7);  
•     P5DIR |= (BIT5 | BIT6 | BIT7);  
•   
•     // Activate LCD output  
•     LCDBPCTL0 = 0xFFFF;  // Select LCD segments S0-S15  
•     LCDBPCTL1 = 0x00FF;  // Select LCD segments S16-S22  
•   
•     // LCD_B Base Address is 0A00H page 30 y in SALS554 document  
•     // show 'h'  
•     lcdmem  = (unsigned char *)0x0A21;  
•     *lcdmem = (unsigned char)(*lcdmem | (BIT2+BIT1+BIT6+BIT0));  
•     // show 'i'  
•     lcdmem  = (unsigned char *)0x0A22;  
•     *lcdmem = (unsigned char)(*lcdmem | (BIT2));  
•     // show 'E'  
•     lcdmem  = (unsigned char *)0x0A2B;  
•     *lcdmem = (unsigned char)(*lcdmem | (BIT4+BIT5+BIT6+BIT0+BIT3));  
•     // show 'A'  
•     lcdmem  = (unsigned char *)0x0A2A;  
•     *lcdmem = (unsigned char)(*lcdmem | (BIT0+BIT1+BIT2+BIT4+BIT5+BIT6));  
•     // show 'r'  
•     lcdmem  = (unsigned char *)0x0A29;  
•     *lcdmem = (unsigned char)(*lcdmem | (BIT6+BIT5));  
•     // show 't'  
•     lcdmem  = (unsigned char *)0x0A28;  
•     *lcdmem = (unsigned char)(*lcdmem | (BIT4+BIT5+BIT6+BIT3));  
•     // show 'h'  
•     lcdmem  = (unsigned char *)0x0A27;  
•     *lcdmem = (unsigned char)(*lcdmem | (BIT4+BIT5+BIT6+BIT2));  
•   
•   __no_operation();  // For debugger  
• }  
•