Compiler/CC2538-CC2592EM-RD: Hard time interfacing HD44780 with CC2538

Issue resolved ! GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_0,1 ) works fine but GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1,1 ) wont work ever as third argument '1' means 0x00000001 and GPIO_PIN_1 would expect '2' as third argument because '2' would mean 0x00000010. Alternatively, we can write GPIO_PIN_X, GPIO_PIN_X as 2nd and 3rd arguments to write pin X HIGH.

While testing pin writes , I used GPIO pin 0 all the times and that's why 3rd arg=1 worked okay. Thus , the issue could not be seen that time and later I did not suspect the third argument at all. Now , after taking note of it and doing necessary changes , i see text on HD44780 16x4 LCD running at 3.3v without backlight. (backlight needs separate supply and is optimal at 5v supply).

Note - Now I am working on creating a library for the same.

Following code works just fine (in zmain.c).

...
extern uint32_t varhigh=0;
extern uint32_t varlow=0;
extern uint32_t cntvar=0;
/******************************************************************************
* LOCAL DEFINITIONS
*/
...

...
/******************************************************************************
* LOCAL FUNCTIONS
*/

static void zmain_dev_info( void );
static void zmain_ext_addr( void );

static void helloworld(void);
...

...
/* Display the device info on the LCD */
#ifdef LCD_SUPPORTED
zmain_dev_info();
zmain_lcd_init();
#endif

#ifdef LCD3
helloworld();
while(1)
{}//*/
#endif
...

...
#ifdef LCD3
static void helloworld( void )
{
varhigh= GPIOPinRead(GPIO_B_BASE, GPIO_PIN_1);
GPIOPinTypeGPIOOutput(GPIO_C_BASE, GPIO_PIN_2|GPIO_PIN_3);//PC2 is RS, PC3 is RW.LED4 is PC3

GPIOPinTypeGPIOOutput(GPIO_B_BASE, GPIO_PIN_1);//PB1 is EN

GPIOPinTypeGPIOOutput(GPIO_A_BASE, GPIO_PIN_6|GPIO_PIN_7);//PA6 is DB4,PA7 is DB5
GPIOPinTypeGPIOOutput(GPIO_D_BASE, GPIO_PIN_4|GPIO_PIN_5);//PD4 is DB6,PD5 is DB7
//D3 to D0 are tied to ground and data/commands are transferred 1, 4 bit nibble at a time.
//while(1)
//{
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, GPIO_PIN_1);//EN goes HIGH
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_3, 0);//RW goes LOW
//0 0 0 1 0 - 0 0 0 0 Set to 4 bit operation (note: 1 nibble operation)
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_2, 0);//RS goes 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_5, 0);//D7 is 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_4, 0);//D6 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_7, GPIO_PIN_7);//D5 is 1
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_6, 0);//D4 is 0
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, 0);//EN goes LOW
for(cntvar=0;cntvar<5000;cntvar++){};//wait for 31 ms

//next command
// 0 0 0 1 0 - 0 0 0 0 Function set, 8 bit
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, GPIO_PIN_1);//EN goes HIGH
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_2, 0);//RS goes 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_5, 0);//D7 is 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_4, 0);//D6 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_7, GPIO_PIN_7);//D5 is 1
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_6, 0);//D4 is 0
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, 0);//EN goes LOW
for(cntvar=0;cntvar<5000;cntvar++){};//wait for 31 ms
//0 1 0 0 0 - 0 0 0 0 2nd nibble
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, GPIO_PIN_1);//EN goes HIGH
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_2, 0);//RS goes 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_5, 1);//D7 is 1
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_4, 0);//D6 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_7, 0);//D5 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_6, 0);//D4 is 0
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, 0);//EN goes LOW
for(cntvar=0;cntvar<5000;cntvar++){};//wait for 31 ms

// next command
// 0 0 0 0 0 - 0 0 0 0 Display ON, Cursor On, Cursor Blinking
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, GPIO_PIN_1);//EN goes HIGH
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_2, 0);//RS goes 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_5, 0);//D7 is 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_4, 0);//D6 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_7, 0);//D5 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_6, 0);//D4 is 0
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, 0);//EN goes LOW
for(cntvar=0;cntvar<5000;cntvar++){};//wait for 31 ms
//0 1 1 1 1 - 0 0 0 0 2nd nibble
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, GPIO_PIN_1);//EN goes HIGH
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_2, 0);//RS goes 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_5, GPIO_PIN_5);//D7 is 1
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_4, GPIO_PIN_4);//D6 is 1
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_7, GPIO_PIN_7);//D5 is 1
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_6, GPIO_PIN_6);//D4 is 1
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, 0);//EN goes LOW
for(cntvar=0;cntvar<5000;cntvar++){};//wait for 31 ms

//next command
//0 0 0 0 0 - 0 0 0 0 Entry Mode, Increment cursor position, No display shift
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, GPIO_PIN_1);//EN goes HIGH
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_2, 0);//RS goes 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_5, 0);//D7 is 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_4, 0);//D6 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_7, 0);//D5 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_6, 0);//D4 is 0
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, 0);//EN goes LOW
for(cntvar=0;cntvar<5000;cntvar++){};//wait for 31 ms
//0 0 1 1 0 - 0 0 0 0 2nd nibble
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, GPIO_PIN_1);//EN goes HIGH
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_2, 0);//RS goes 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_5, 0);//D7 is 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_4, GPIO_PIN_4);//D6 is 1
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_7, GPIO_PIN_7);//D5 is 1
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_6, 0);//D4 is 0
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, 0);//EN goes LOW
for(cntvar=0;cntvar<5000;cntvar++){};//wait for 31 ms

for (varhigh=0;varhigh<4;varhigh++)
{
//data 'H'
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, GPIO_PIN_1);//EN goes HIGH
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_2, GPIO_PIN_2);//RS goes 1
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_5, 0);//D7 is 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_4, GPIO_PIN_4);//D6 is 1
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_7, 0);//D5 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_6, 0);//D4 is 0
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, 0);//EN goes LOW
for(cntvar=0;cntvar<5000;cntvar++){};//wait for 31 ms
// 1 1 0 0 0 - 0 0 0 0 2nd nibble
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, GPIO_PIN_1);//EN goes HIGH
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_2, GPIO_PIN_2);//RS goes 1
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_5, GPIO_PIN_5);//D7 is 1
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_4, 0);//D6 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_7, 0);//D5 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_6, 0);//D4 is 0
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, 0);//EN goes LOW
for(cntvar=0;cntvar<5000;cntvar++){};//wait for 31 ms

//data 'E'
//1 0 1 1 0 - 0 0 0 0 e
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, GPIO_PIN_1);//EN goes HIGH
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_2, GPIO_PIN_2);//RS goes 1
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_5, 0);//D7 is 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_4, GPIO_PIN_4);//D6 is 1
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_7, GPIO_PIN_7);//D5 is 1
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_6, 0);//D4 is 0
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, 0);//EN goes LOW
for(cntvar=0;cntvar<5000;cntvar++){};//wait for 31 ms
//1 0 1 0 1 - 0 0 0 0 2nd nibble
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, GPIO_PIN_1);//EN goes HIGH
GPIOPinWrite(GPIO_C_BASE, GPIO_PIN_2, GPIO_PIN_2);//RS goes 1
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_5, 0);//D7 is 0
GPIOPinWrite(GPIO_D_BASE, GPIO_PIN_4, GPIO_PIN_4);//D6 is 1
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_7, 0);//D5 is 0
GPIOPinWrite(GPIO_A_BASE, GPIO_PIN_6, GPIO_PIN_6);//D4 is 1
GPIOPinWrite(GPIO_B_BASE, GPIO_PIN_1, 0);//EN goes LOW
for(cntvar=0;cntvar<5000;cntvar++){};//wait for 31 ms
//}
}
//data "l"

}
#endif