#include "lcd_iic.h"
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#include "gpio.h"
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#include "devicegpioinit.h"
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void I2c_Scl_Gpio_Init(void)
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{
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CMU_PERCLK_SetableEx(PADCLK, ENABLE); // PADʱÖÓ£¨GPIO£©Ê¹Äܺ¯Êý
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OutputIO(LCD_SCL_PIN_GROUP, LCD_SCL_PIN_NUM, OUT_PUSHPULL);
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LCD_SCL_L;
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}
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void Sda_Out(void)
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{
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CMU_PERCLK_SetableEx(PADCLK, ENABLE); // PADʱÖÓ£¨GPIO£©Ê¹Äܺ¯Êý
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OutputIO(LCD_SDA_PIN_GROUP, LCD_SDA_PIN_NUM, OUT_PUSHPULL);
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}
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void Sda_In(void)
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{
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CMU_PERCLK_SetableEx(PADCLK, ENABLE); // PADʱÖÓ£¨GPIO£©Ê¹Äܺ¯Êý
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InputtIO(LCD_SDA_PIN_GROUP, LCD_SDA_PIN_NUM, IN_NORMAL);
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}
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void LCD_IIC_Start(void)
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{
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Sda_Out();
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LCD_SDA_H;
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LCD_SCL_H;
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delay_us(5);
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LCD_SDA_L; // Æô¶¯¿ªÊ¼ÐźÅ
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delay_us(4);
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LCD_SCL_L; // ǯסI2C×ÜÏߣ¬×¼±¸·¢ËÍ»ò½ÓÊÕÊý¾Ý
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}
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void LCD_IIC_Stop(void)
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{
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Sda_Out(); // SDAÏßÊä³ö
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LCD_SDA_L; // ·¢ËͽáÊøÌõ¼þµÄÊý¾ÝÐźÅ
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delay_us(4);
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LCD_SCL_H;
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delay_us(4); // ½áÊøÌõ¼þ½¨Á¢Ê±¼ä´óÓÚ4¦Ì
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LCD_SDA_H; // ·¢ËÍI2C×ÜÏß½áÊøÐźÅ
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delay_us(5);
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}
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void LCD_IIC_Send_Byte(uint8_t dat)
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{
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// unsigned char temp;
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// Sda_Out();
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// for (temp = 0x80; temp != 0; temp >>= 1)
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// {
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// if ((temp & dat) == 0)
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// LCD_SDA_L;
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// else
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// LCD_SDA_H;
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// delay_us(1); /// ½¨Á¢Êý¾Ýʱ¼ä
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// LCD_SCL_H;
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// delay_us(4); // t_h
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// LCD_SCL_L;
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// delay_us(5); // t_l
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unsigned char i;
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Sda_Out();
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for (i = 0; i < 8; i++)
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{
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if (dat & 0x80)
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LCD_SDA_H;
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else
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LCD_SDA_L;
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dat <<= 1;
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delay_us(10);
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LCD_SCL_H;
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delay_us(10);
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LCD_SCL_L;
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}
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delay_us(10);
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LCD_SCL_H;
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delay_us(10);
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LCD_SCL_L;
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}
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uint8_t LCD_IIC_Read_Byte(void)
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{
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unsigned char temp;
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unsigned char dat = 0;
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LCD_SDA_H; // ÊÍ·Å×ÜÏß×¼±¸½ÓÊÕ
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Sda_In();
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for (temp = 0x80; temp != 0; temp >>= 1)
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{
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LCD_SCL_H;
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delay_us(1);
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if (LCD_SDA_READ == 1)
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dat |= temp;
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else
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dat &= ~temp;
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LCD_SCL_L;
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delay_us(4);
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}
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return dat;
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}
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// uint8_t LCD_IIC_Read_Byte(void)/*(bool ack)*/
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//{
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//
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// uint8_t byte = 0;
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// LCD_SDA_H; // È·±£SDAΪÊäÈë
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// for (int i = 0; i < 8; i++) {
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// LCD_SCL_H;
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// delay_us(1);
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// byte <<= 1;
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// if (LCD_SDA_READ) {
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// byte |= 0x01;
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// }
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// LCD_SCL_L;
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// delay_us(4);
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// }
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//// if (ack) {
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//// LCD_IIC_Ack();
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//// } else {
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//// LCD_IIC_NAck();
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//// }
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// Sda_Out();
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// return byte;
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//
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//}
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char LCD_IIC_Wait_Ack(void)
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{
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uint32_t con = 0;
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Sda_In();
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LCD_SDA_H; // ÊÍ·ÅÊý¾ÝÏߣ¬×¼±¸½ÓÊÕÓ¦´ð
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delay_us(1);
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LCD_SCL_H; // CPUÇý¶¯SCL = 1, ´ËʱÆ÷¼þ»á·µ»ØACKÓ¦´ð
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delay_us(1);
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while (LCD_SDA_READ) // CPU¶ÁÈ¡SDA¿ÚÏß״̬
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{
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con++;
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if (con > 500)
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{
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LCD_IIC_Stop();
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return 1; // ÎÞÓ¦´ðÐźÅ
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}
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}
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LCD_SCL_L;
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delay_us(1);
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return 0; // ÓÐÓ¦´ð
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}
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void LCD_IIC_Ack(void)
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{
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Sda_Out();
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LCD_SDA_L;
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delay_us(1);
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LCD_SCL_H; // CPU²úÉú1¸öʱÖÓ
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delay_us(4); // ʱÖӵ͵çƽÖÜÆÚ´óÓÚ4¦Ì
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LCD_SCL_L; // ÇåʱÖÓÏߣ¬Ç¯×¡I2C×ÜÏßÒÔ±ã¼ÌÐø½ÓÊÕ
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delay_us(4);
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LCD_SDA_H; // CPUÊÍ·ÅSDA×ÜÏß
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}
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void LCD_IIC_NAck(void)
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{
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Sda_Out();
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LCD_SDA_H;
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delay_us(1);
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LCD_SCL_H;
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delay_us(4);
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LCD_SCL_L;
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delay_us(4);
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}
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/*
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LCDд²Ù×÷£º
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ÆðʼÐźš¢Ð´´Ó»úµØÖ·¡¢ÃüÁî×Ö½Ú¡¢É趨×Ö½Ú¡¢Í£Ö¹ÐźÅ
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*/
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void LCD_Write(u8 command_add, u8 *wait_data, u8 data_len)
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{
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u8 i = 0;
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LCD_IIC_Start();
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LCD_IIC_Send_Byte(LCD_ADDR_WRITE);
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LCD_IIC_Send_Byte(command_add);
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for (i = 0; i < data_len; i++)
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LCD_IIC_Send_Byte(wait_data[i]);
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LCD_IIC_Stop();
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}
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/*
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ÏÔʾÊý¾ÝÊäÈëÃüÁstarts +w/r_addr+ ÃüÁî×Ö½Ú£¨0x80£©+ram¼Ä´æÆ÷µØÖ·+Êý¾ÝÄÚÈÝ......+stop ÐźÅ
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*/
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void LCD_Write_reg(u8 sadd, u8 *buf, u8 len)
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{
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u8 i = 0;
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LCD_IIC_Start();
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LCD_IIC_Send_Byte(LCD_ADDR_WRITE);
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LCD_IIC_Send_Byte(LCD_REG_DATA_ADDR);
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LCD_IIC_Send_Byte(sadd);
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for (i = 0; i < len; i++)
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{
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LCD_IIC_Send_Byte(buf[i]);
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}
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LCD_IIC_Stop();
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}
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