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Add support for EastRising (BuyDisplay) ER-OLEDM1602-4Y #1

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Add support for EastRising (BuyDisplay) ER-OLEDM1602-4Y #1

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19 changes: 18 additions & 1 deletion Firmware/Src/lcd.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
#define DAT_LINE ((uint16_t)0x00F0)
#define E_LINE GPIO_PIN_3
#define RS_LINE GPIO_PIN_2
#define RESET_LINE GPIO_PIN_1

char digits[11];

Expand Down Expand Up @@ -38,6 +39,15 @@ void lcd_init()

void oled_init()
{
#ifdef OLED_EASTRISING
HAL_GPIO_WritePin( GPIOA, E_LINE, GPIO_PIN_RESET ); // E line startup state
HAL_GPIO_WritePin( GPIOA, RS_LINE, GPIO_PIN_RESET ); // command mode

HAL_GPIO_WritePin( GPIOB, RESET_LINE, GPIO_PIN_RESET );
lcd_delay( 100000 ); // awaiting for power supply stability
HAL_GPIO_WritePin( GPIOB, RESET_LINE, GPIO_PIN_SET );
lcd_delay( 100 );
#else
HAL_GPIO_WritePin( GPIOA, E_LINE, GPIO_PIN_SET ); // E line startup state
HAL_GPIO_WritePin( GPIOA, RS_LINE, GPIO_PIN_RESET ); // command mode

Expand All @@ -64,7 +74,8 @@ void oled_init()
GPIOA->ODR = GPIOA->ODR & ~DAT_LINE | 0x20; // 0010 0000b
lcd_pulse();
lcd_delay( 40 );

#endif

// function set
lcd_command( 0x28 ); // 0010 1000b; 4-bit, 2-line, 5x8
lcd_command( 0x0c ); // 0000 1100b; display=on, cursor=off, blinking=off
Expand Down Expand Up @@ -152,6 +163,12 @@ void lcd_printd4( int32_t n )

void lcd_position( uint8_t position )
{
#ifdef OLED_EASTRISING
// The datasheet lies. Second line
// is in a different position.
if (position & 0x40)
position -= 0x20;
#endif
lcd_command( position | 0x80 );
}

Expand Down
25 changes: 25 additions & 0 deletions Firmware/Src/lcd.h
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Original file line number Diff line number Diff line change
Expand Up @@ -14,3 +14,28 @@ void lcd_position( uint8_t );
void lcd_clear();
void lcd_pulse();
extern void lcd_delay( uint32_t delay );

// Support for the ER-OLEDM1602-4Y OLED from Buydisplay.
// In lieu of the LED on PB1, PB1 must be connected to
// RESET. CS should be tied to ground.
// Jumper settings: BS2 HIGH BS1 LOW BS0 HIGH
//
// Pin mapping:
// VCC - 3.3V
// RD - E
// RW - R/W
// DC - RS
// RES - PB1
// CS - GND
// D7-D4 to D7-D4 straight.
//
// I placed an extra cap VCC-GND on the OLED board, this
// might not be necessary.
// Note that programming may fail if the display is connected
// (unsure why)
//
// 3.3V current draw ~65mA continuous. Suggest maybe
// substitute a different 3.3V regulator for more margin?

// Define for ER-OLEDM1602-4Y, undef for WEH001602AGPP5N00001
#define OLED_EASTRISING
2 changes: 2 additions & 0 deletions Firmware/Src/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -234,7 +234,9 @@ int main(void)
if( hal_tick % IWDG_REFRESH_DELAY == 0 )
{
HAL_IWDG_Refresh( &hiwdg );
#ifndef OLED_EASTRISING // Pin used for reset line
HAL_GPIO_TogglePin( GPIOB, GPIO_PIN_1 ); //heartbeat just for fun
#endif
}

if( tip_delay > 0 )
Expand Down