Hi,
I have made a code in keil using CMSIS for 16x2 LCD.I am not able to get corresponding data according to data send on the data port.I was unable to identify the problem.
I have checked the data the GPIO port is getting is correct,but LCD shows some other data.
Can somebody help to identify the problem?
Code:-
#include "stm32l4xx.h"
/*
PA0 --->PA7 PORT FOR DATA
RS--->PC0
EN--->PC2
RW--->PC1
*/
void lcdcmd( uint8_t);
void lcddata(uint8_t);
long int i;
int x=0x80;
RCC_TypeDef *clock;
GPIO_TypeDef *GPIO;
GPIO_TypeDef *GPIO1;
//clock=RCC;
//GPIO=GPIOA;
int main(){
/*RCC_TypeDef *clock;
GPIO_TypeDef *GPIO;*/
clock=RCC;
GPIO=GPIOA;
GPIO1=GPIOC;
clock->CR &=0x00000000;
clock->CR |=(1<<16);
while(!((clock->CR)&(1<<17)));
clock->CFGR &=0x00000000;
clock->CFGR|=0x0A0;
clock->AHB2ENR&=0x00000000;
clock->AHB2ENR|=0x05;
GPIO->MODER &=0xABFFFFFF;
GPIO->MODER &=0xABFF5555;
GPIO1->MODER &=0xFFFFFFFF;
GPIO1->MODER &=0xFFFFF15;
GPIO->OTYPER &=0x00000000;
GPIO1->OTYPER &=0x00000000;
GPIO->OSPEEDR|=0x0C000000;
GPIO1->OSPEEDR|=0x00000000;
GPIO->ODR &=0x00000000;
GPIO1->ODR =0x00000000;
lcdcmd(0x38);
for(uint32_t i=0;i<15001;i++);//wait for 15 ms
lcdcmd(0x38);
for(uint32_t i=0;i<5001;i++);
lcdcmd(0x38);
for(uint32_t i=0;i<51;i++);
lcdcmd(0x0F);
lcdcmd(0x01);
lcdcmd(0x80);
lcddata('a');
while(1){
}
}
void lcdcmd(
uint8_t cmd)
{
GPIO1->ODR &= ~((1U<<0)|(1U<<1));//RS OFF
GPIO1->ODR |= (1U<<2);//EN ON
for( i=0;i<11;i++)__ASM("NOP");
GPIO->ODR=cmd;
GPIO1->ODR &=~( (1U<<0)|(1U<<1)|(1U<<2));//EN OFF
for( i=0;i<11;i++)__ASM("NOP");
}
void lcddata( uint8_t data)
{
GPIO1->ODR |= (1U<<0);//RS ON
GPIO1->ODR &= ~(1U<<1);//PC2 OFF OR RW OFF
GPIO1->ODR |= (1U<<2);//EN ON
for( i=0;i<11;i++)__ASM("NOP");
GPIO->ODR=data;
GPIO1->ODR &= ~((1U<<2)|(1U<<1));//EN OFF
for( i=0;i<11;i++)__ASM("NOP");
}
