STM32 und LCD2004A ohne I2C-Schnittstelle

#ifndef DELAY_DELAY_H_
#define DELAY_DELAY_H_

#include "stm32f1xx.h"

#define F_CPU 72000000UL
#define US F_CPU/1000000
#define MS F_CPU/1000
#define SYSTICK_MAX_VALUE 16777215
#define US_MAX_VALUE SYSTICK_MAX_VALUE/(US)
#define MS_MAX_VALUE SYSTICK_MAX_VALUE/(MS)


void delay_us(uint32_t us); //  233 
void delay_ms(uint32_t ms); //  233 
void delay_s(uint32_t s);

#endif /* DELAY_DELAY_H_ */

#include "delay.h"


/*      */

void delay_us(uint32_t us){ //  233 016 

	if (us > US_MAX_VALUE || us == 0)
		return;

	SysTick->CTRL &= ~SysTick_CTRL_TICKINT_Msk; //     0
	SysTick->CTRL |= SysTick_CTRL_CLKSOURCE_Msk; //    
	SysTick->LOAD = (US * us-1); //       
	SysTick->VAL = 0; //     SYST_CVR
	SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; //  

	while(!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk)); //    COUNFLAG   SYST_CSR

	SysTick->CTRL &= ~SysTick_CTRL_COUNTFLAG_Msk;	//   COUNTFLAG
	SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; //  

}

void delay_ms(uint32_t ms){ //  233 

	if(ms > MS_MAX_VALUE || ms ==0)
		return;

	SysTick->CTRL &= ~SysTick_CTRL_TICKINT_Msk;
	SysTick->CTRL |= SysTick_CTRL_CLKSOURCE_Msk;
	SysTick->LOAD = (MS * ms);
	SysTick->VAL = 0;
	SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;

	while(!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk));

	SysTick->CTRL &= ~SysTick_CTRL_COUNTFLAG_Msk;
	SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;


}

void delay_s(uint32_t s){

	for(int i=0; i<s*5;i++) delay_ms(200);
}

#ifndef LCD_LCD_20X4_2004A_LCD_20X4_H_
#define LCD_LCD_20X4_2004A_LCD_20X4_H_

#include "stm32f1xx.h"
#include "delay.h"

// display commands

#define CLEAR_DISPLAY 0x1
#define RETURN_HOME 0x2
#define ENTRY_MODE_SET 0x6 // mode cursor shift rihgt, display non shift
#define DISPLAY_ON 0xC // non cursor
#define DISPLAY_OFF 0x8
#define CURSOR_SHIFT_LEFT 0x10
#define CURSOR_SHIFT_RIGHT 0x14
#define DISPLAY_SHIFT_LEFT 0x18
#define DISPLAY_SHIFT_RIGHT 0x1C
#define DATA_BUS_4BIT_PAGE0 0x28
#define DATA_BUS_4BIT_PAGE1 0x2A
#define DATA_BUS_8BIT_PAGE0 0x38
#define SET_CGRAM_ADDRESS 0x40 // usage address |= SET_CGRAM_ADDRESS
#define SET_DDRAM_ADDRESS 0x80


//     ODR
#define PIN_RS 0x1
#define PIN_EN 0x2
#define PIN_D7 0x80
#define PIN_D6 0x40
#define PIN_D5 0x20
#define PIN_D4 0x400



#define     LCD_PORT               	GPIOB
#define		LCD_ODR 				LCD_PORT->ODR

#define     LCD_PIN_RS()     		LCD_PORT->CRL &= ~GPIO_CRL_CNF0; \
									LCD_PORT->CRL |= GPIO_CRL_MODE0;    // PB0   -,  50 

#define     LCD_PIN_EN()            LCD_PORT->CRL &= ~GPIO_CRL_CNF1;\
									LCD_PORT->CRL |= GPIO_CRL_MODE1;        // PB1

#define     LCD_PIN_D7()            LCD_PORT->CRL &= ~GPIO_CRL_CNF7;\
									LCD_PORT->CRL |= GPIO_CRL_MODE7;          // PB7

#define     LCD_PIN_D6()            LCD_PORT->CRL &= ~GPIO_CRL_CNF6;\
									LCD_PORT->CRL |= GPIO_CRL_MODE6;       // PB6

#define     LCD_PIN_D5()            LCD_PORT->CRL &= ~GPIO_CRL_CNF5;\
									LCD_PORT->CRL |= GPIO_CRL_MODE5;         // PB5

#define     LCD_PIN_D4()            LCD_PORT->CRH &= ~GPIO_CRH_CNF10;\
									LCD_PORT->CRH |= GPIO_CRH_MODE10;         // PB10

#define     LCD_PIN_MASK   (PIN_RS | PIN_EN | PIN_D7 | PIN_D6 | PIN_D5 | PIN_D4) // 0b0000000011110011    

void portInit(void); //     
void sendByte(char byte, int isData);
void lcdInit(void); //  
void sendStr(char *str, int row ); //  

#endif /* LCD_LCD_20X4_2004A_LCD_20X4_H_ */

#include "lcd_20x4.h"

//     LCD

void sendByte(char byte, int isData){

	//   
	LCD_ODR &= ~LCD_PIN_MASK;

	if(isData == 1) LCD_ODR |= PIN_RS; //    RS
		else LCD_ODR &= ~(PIN_RS);		   //   RS

	//     
	if(byte & 0x80) LCD_ODR |= PIN_D7;
	if(byte & 0x40) LCD_ODR |= PIN_D6;
	if(byte & 0x20) LCD_ODR |= PIN_D5;
	if(byte & 0x10) LCD_ODR |= PIN_D4;

	//   E
	LCD_ODR |= PIN_EN;
	LCD_ODR &= ~PIN_EN; //   

	//     RS

	LCD_ODR &= ~(LCD_PIN_MASK & ~PIN_RS);

	//     
	if(byte & 0x8) LCD_ODR |= PIN_D7;
	if(byte & 0x4) LCD_ODR |= PIN_D6;
	if(byte & 0x2) LCD_ODR |= PIN_D5;
	if(byte & 0x1) LCD_ODR |= PIN_D4;

	//   E

	LCD_ODR |= PIN_EN;
	//delay_us(10);

	//   

	LCD_ODR &= ~(PIN_EN);
	delay_us(40);


	return;
}

//               50 

void portInit(void){

//----------------------  ----------------------------------------------------

	if(LCD_PORT == GPIOB) RCC->APB2ENR |= RCC_APB2ENR_IOPBEN;
	else if (LCD_PORT == GPIOA) RCC->APB2ENR |= RCC_APB2ENR_IOPAEN;
	else return;

//---------------------    LCD-----------------------------------------------------

		LCD_PIN_RS();
		LCD_PIN_EN();
		LCD_PIN_D7();
		LCD_PIN_D6();
		LCD_PIN_D5();
		LCD_PIN_D4();

		lcdInit();

	return ;
}

//---------------------  -----------------------------------------------------------
void lcdInit(void){

			delay_ms(15); //    

			sendByte(0x33, 0); //      0011
			delay_us(100);

			sendByte(0x32, 0); //      00110010
			delay_us(40);

			sendByte(DATA_BUS_4BIT_PAGE0, 0); //   4 
			delay_us(40);
			sendByte(DISPLAY_OFF, 0); //  
			delay_us(40);
			sendByte(CLEAR_DISPLAY, 0); //  
			delay_ms(2);
			sendByte(ENTRY_MODE_SET, 0); //      
			delay_us(40);
			sendByte(DISPLAY_ON, 0);//     
			delay_us(40);


	return ;
}

void sendStr(char *str, int row ){

	char start_address;

	switch (row) {

	case 1:
		start_address = 0x0; // 1 
		break;

	case 2:
		start_address = 0x40; // 2 
		break;

	case 3:
		start_address = 0x14; // 3 
		break;

	case 4:
		start_address = 0x54; // 4 
		break;

	}

	sendByte((start_address |= SET_DDRAM_ADDRESS), 0); //         DDRAM

	delay_ms(4);
	while(*str != '\0'){

		sendByte(*str, 1);
		str++;
		//delay_ms(100);

	}// while
}