TLC2543 test of Wipom board

TLC2543 test. reading and display middle point of ADC.

Code Example

int main(void)
{
	delayMs(250);
	
	UINT cnt =0;
	UINT value;
	
	tprintf("\n\rWiPOM");
	tprintf("\n\rTLC2543 Test");
	
	TLC2543_Enable();
	for(;;)
	{
		value = TLC2543_Read(0x0B); // mid point

		tprintf("\n\rcnt=%lu value=%lu", cnt++, value);
		delayMs(1000);
	}
	return 0;
}
//********************************************************************************

void TLC2543_SetBit(UINT bit)
{
	GPIO_InitTypeDef	GPIO_InitStructure;
	//

    GPIO_InitStructure.GPIO_Pin = (1UL<<bit);
  	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  	GPIO_Init(GPIOE, &GPIO_InitStructure);
}

//********************************************************************************

void TLC2543_ClrBit(UINT bit)
{
	GPIO_InitTypeDef	GPIO_InitStructure;
	//

    GPIO_InitStructure.GPIO_Pin = (1UL<<bit);
  	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
  	GPIO_Init(GPIOE, &GPIO_InitStructure);
	GPIO_ResetBits(GPIOE,(1UL<<bit));
}

//********************************************************************************

UINT TLC2543_GetBit(UINT bit)
{
	return GPIO_ReadInputDataBit(GPIOE,(1UL<<bit));
}

//********************************************************************************

void TLC2543_Enable(void)
{
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE,ENABLE);
}

//********************************************************************************

UINT TLC2543_Read( UBYTE channel )
{
	UINT value = 0;
	UBYTE i;

	channel <<= 4;
	channel &=0xF0;
	TLC2543_SetBit(TLC2543_ADCDOUT); // Configure input

	TLC2543_SetBit(TLC2543_ADCEOC);  // Configure input		

	TLC2543_ClrBit(TLC2543_ADCCLOCK);
	TLC2543_ClrBit(TLC2543_ADCCS);
	delayUs(TLC2543_DELAY_US);
	for( i=0; i<8; i++ )
	{
		if( channel & 0x80 )	{ TLC2543_SetBit(TLC2543_ADCDIN);}
		else					{ TLC2543_ClrBit(TLC2543_ADCDIN);}
		delayUs(TLC2543_DELAY_US);				
		TLC2543_SetBit(TLC2543_ADCCLOCK);
		delayUs(TLC2543_DELAY_US);
		TLC2543_ClrBit(TLC2543_ADCCLOCK);
		delayUs(TLC2543_DELAY_US);
		channel = channel << 1;
	}

	TLC2543_ClrBit(TLC2543_ADCDIN);
	// Dummy 4 bits	

	for( i=0; i<4; i++ )
	{
		TLC2543_SetBit(TLC2543_ADCCLOCK);
		delayUs(TLC2543_DELAY_US);
		TLC2543_ClrBit(TLC2543_ADCCLOCK);
		delayUs(TLC2543_DELAY_US);
	}
	// Wait until end of conversion

	while(!TLC2543_GetBit(TLC2543_ADCEOC)); 
	// Now read 12 bits of value from ADC

	value = 0;
	for( i=0; i<12; i++ )
	{
		value <<= 1;
		value |= TLC2543_GetBit(TLC2543_ADCDOUT);
		TLC2543_SetBit(TLC2543_ADCCLOCK);
		delayUs(TLC2543_DELAY_US);
		TLC2543_ClrBit(TLC2543_ADCCLOCK);
		delayUs(TLC2543_DELAY_US);
	}
	TLC2543_SetBit(TLC2543_ADCCS);
	TLC2543_SetBit(TLC2543_ADCCLOCK);
	TLC2543_SetBit(TLC2543_ADCDIN);
	//

	return value;
}