CC2530: LCD SPI questions

Jack Loop

Part Number: CC2530

Hi,

I see that the purpose of HalLcd_HW_Control is to send a command. However, in the below code, it seems to be telling the LCD which register it would be sending data to. Is this considered a command?

void HalLcd_HW_SetContrast(uint8 value)
{
  SET_ICONRAM_ADDR(CONTRAST_CTRL_REGISTER);
  HalLcd_HW_Write(value);
}

Also, I see in the below, that there is always a hex value OR to the function's parameter. What are these hex values are supposed to represent? A register?

#define SET_DISPLAY_CTRL(options)       HalLcd_HW_Control(0x28 | (options))
#define SET_DDRAM_ADDR(charIndex)       HalLcd_HW_Control(0x80 | (charIndex))
#define SET_GCRAM_CHAR(specIndex)       HalLcd_HW_Control(0xC0 | (specIndex))
#define SET_ICONRAM_ADDR(addr)          HalLcd_HW_Control(0x40 | (addr))

over 6 years ago

0 YiKai Chen over 6 years ago

Guru 735585 points

What do you mean “Is this considered a command?”

0 Jack Loop over 6 years ago in reply to YiKai Chen

Guru 17870 points

SET_DISPLAY_CTRL(DISPLAY_CTRL_ON | DISPLAY_CTRL_BLINK_OFF | DISPLAY_CTRL_CURSOR_OFF) seems like a "send command" to the LCD while SET_ICONRAM_ADDR(CONTRAST_CTRL_REGISTER) seems like a register set. However, I am unsure - so how do these differ?

Also, could you reply to the 2nd question.

0 YiKai Chen over 6 years ago in reply to Jack Loop

Guru 735585 points

Basically, those are SPI commands that LCD supports. CC2530 sends those SPI commands to LCD for different settings or display. You can refer to LCD spec for details.

0 Jack Loop over 6 years ago in reply to YiKai Chen

Guru 17870 points

1. Can you send the link to the LCD spec?

2. Also, for the 2nd question, I think that basically what is happening is: the combining of the register address and the command into one byte. Do you agree?

0 YiKai Chen over 6 years ago in reply to Jack Loop

Guru 735585 points

1. e2e.ti.com/.../1401.HMC16311-SPEC.pdf
2. Actually, it’s more like combining base command address and specific command sub address into one byte.

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CC2530: LCD SPI questions