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/*****************************************************************************
* main.c: Main C file for NXP LPC13xx Family Microprocessors
*
* Copyright(C) 2008, NXP Semiconductor
* All rights reserved.
*
* History
* 2008.07.20 ver 1.00 Preliminary version, first Release
*
*****************************************************************************/
#include "LPC13xx.h" /* LPC13xx Peripheral Registers */
#include "adc.h"
volatile uint32_t ADCValue[ADC_NUM];
volatile uint32_t ADCIntDone = 0;
#if BURST_MODE
volatile uint32_t channel_flag;
#endif
#if ADC_INTERRUPT_FLAG
/******************************************************************************
** Function name: ADC_IRQHandler
**
** Descriptions: ADC interrupt handler
**
** parameters: None
** Returned value: None
**
******************************************************************************/
void ADC_IRQHandler (void)
{
uint32_t regVal;
LPC_ADC->CR &= 0xF8FFFFFF; /* stop ADC now */
regVal = LPC_ADC->STAT; /* Read ADC will clear the interrupt */
if ( regVal & 0x0000FF00 ) /* check OVERRUN error first */
{
regVal = (regVal & 0x0000FF00) >> 0x08;
/* if overrun, just read ADDR to clear */
/* regVal variable has been reused. */
switch ( regVal )
{
case 0x01:
regVal = LPC_ADC->DR0;
break;
case 0x02:
regVal = LPC_ADC->DR1;
break;
case 0x04:
regVal = LPC_ADC->DR2;
break;
case 0x08:
regVal = LPC_ADC->DR3;
break;
case 0x10:
regVal = LPC_ADC->DR4;
break;
case 0x20:
regVal = LPC_ADC->DR5;
break;
case 0x40:
regVal = LPC_ADC->DR6;
break;
case 0x80:
regVal = LPC_ADC->DR7;
break;
default:
break;
}
LPC_ADC->CR &= 0xF8FFFFFF; /* stop ADC now */
ADCIntDone = 1;
return;
}
if ( regVal & ADC_ADINT )
{
switch ( regVal & 0xFF ) /* check DONE bit */
{
case 0x01:
ADCValue[0] = ( LPC_ADC->DR0 >> 6 ) & 0x3FF;
break;
case 0x02:
ADCValue[1] = ( LPC_ADC->DR1 >> 6 ) & 0x3FF;
break;
case 0x04:
ADCValue[2] = ( LPC_ADC->DR2 >> 6 ) & 0x3FF;
break;
case 0x08:
ADCValue[3] = ( LPC_ADC->DR3 >> 6 ) & 0x3FF;
break;
case 0x10:
ADCValue[4] = ( LPC_ADC->DR4 >> 6 ) & 0x3FF;
break;
case 0x20:
ADCValue[5] = ( LPC_ADC->DR5 >> 6 ) & 0x3FF;
break;
case 0x40:
ADCValue[6] = ( LPC_ADC->DR6 >> 6 ) & 0x3FF;
break;
case 0x80:
ADCValue[7] = ( LPC_ADC->DR7 >> 6 ) & 0x3FF;
break;
default:
break;
}
#if BURST_MODE
channel_flag |= (regVal & 0xFF);
if ( (channel_flag & 0xFF) == 0xFF )
{
/* All the bits in have been set, it indicates all the ADC
channels have been converted. */
LPC_ADC->CR &= 0xF8FFFFFF; /* stop ADC now */
}
#endif
ADCIntDone = 1;
}
return;
}
#endif
/*****************************************************************************
** Function name: ADCInit
**
** Descriptions: initialize ADC channel
**
** parameters: ADC clock rate
** Returned value: None
**
*****************************************************************************/
void ADCInit( uint32_t ADC_Clk )
{
/* Disable Power down bit to the ADC block. */
LPC_SYSCON->PDRUNCFG &= ~(0x1<<4);
/* Enable AHB clock to the ADC. */
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<13);
/* Unlike some other pings, for ADC test, all the pins need
to set to analog mode. Bit 7 needs to be cleared according
to design team. */
#ifdef __JTAG_DISABLED
LPC_IOCON->JTAG_TDI_PIO0_11 &= ~0x8F; /* ADC I/O config */
LPC_IOCON->JTAG_TDI_PIO0_11 |= 0x02; /* ADC IN0 */
LPC_IOCON->JTAG_TMS_PIO1_0 &= ~0x8F;
LPC_IOCON->JTAG_TMS_PIO1_0 |= 0x02; /* ADC IN1 */
LPC_IOCON->JTAG_TDO_PIO1_1 &= ~0x8F;
LPC_IOCON->JTAG_TDO_PIO1_1 |= 0x02; /* ADC IN2 */
LPC_IOCON->JTAG_nTRST_PIO1_2 &= ~0x8F;
LPC_IOCON->JTAG_nTRST_PIO1_2 |= 0x02; /* ADC IN3 */
#ifdef __SWD_DISABLED
LPC_IOCON->ARM_SWDIO_PIO1_3 &= ~0x8F;
LPC_IOCON->ARM_SWDIO_PIO1_3 |= 0x02; /* ADC IN4 */
#endif
#endif
LPC_IOCON->JTAG_TDI_PIO0_11 = 0x02; // Select AD0 pin function
LPC_IOCON->JTAG_TMS_PIO1_0 = 0x02; // Select AD1 pin function
LPC_IOCON->JTAG_TDO_PIO1_1 = 0x02; // Select AD2 pin function
LPC_IOCON->JTAG_nTRST_PIO1_2 = 0x02; // Select AD3 pin function
// LPC_IOCON->ARM_SWDIO_PIO1_3 = 0x02; // Select AD4 pin function
LPC_IOCON->PIO1_4 = 0x01; // Select AD5 pin function
LPC_IOCON->PIO1_10 = 0x01; // Select AD6 pin function
LPC_IOCON->PIO1_11 = 0x01; // Select AD7 pin function
LPC_ADC->CR = ((SystemCoreClock/LPC_SYSCON->SYSAHBCLKDIV)/ADC_Clk-1)<<8;
/* If POLLING, no need to do the following */
#if ADC_INTERRUPT_FLAG
NVIC_EnableIRQ(ADC_IRQn);
LPC_ADC->INTEN = 0x1FF; /* Enable all interrupts */
#endif
return;
}
/*****************************************************************************
** Function name: ADCRead
**
** Descriptions: Read ADC channel
**
** parameters: Channel number
** Returned value: Value read, if interrupt driven, return channel #
**
*****************************************************************************/
uint32_t ADCRead( uint8_t channelNum )
{
#if !ADC_INTERRUPT_FLAG
uint32_t regVal, ADC_Data;
#endif
/* channel number is 0 through 7 */
if ( channelNum >= ADC_NUM )
{
channelNum = 0; /* reset channel number to 0 */
}
LPC_ADC->CR &= 0xFFFFFF00; // clear channel selection
LPC_ADC->CR |= (1 << 24) | (1 << channelNum);
/* switch channel,start A/D convert */
#if !ADC_INTERRUPT_FLAG
while ( 1 ) /* wait until end of A/D convert */
{
regVal = *(volatile unsigned long *)(LPC_ADC_BASE
+ ADC_OFFSET + ADC_INDEX * channelNum);
/* read result of A/D conversion */
if ( regVal & ADC_DONE )
{
break;
}
}
LPC_ADC->CR &= 0xF8FFFFFF; /* stop ADC now */
if ( regVal & ADC_OVERRUN ) /* save data when it's not overrun, otherwise, return zero */
{
return ( 0 );
}
ADC_Data = ( regVal >> 6 ) & 0x3FF;
return ( ADC_Data ); /* return A/D conversion value */
#else
return ( channelNum ); /* if it's interrupt driven, the ADC reading is
done inside the handler. so, return channel number */
#endif
}
/*****************************************************************************
** Function name: ADC0BurstRead
**
** Descriptions: Use burst mode to convert multiple channels once.
**
** parameters: None
** Returned value: None
**
*****************************************************************************/
void ADCBurstRead( void )
{
if ( LPC_ADC->CR & (0x7<<24) )
{
LPC_ADC->CR &= ~(0x7<<24);
}
/* Test channel 5,6,7 using burst mode because they are not shared
with the JTAG pins. */
LPC_ADC->CR &= ~0xFF;
/* Read all channels, 0 through 7. */
LPC_ADC->CR |= (0xFF);
LPC_ADC->CR |= (0x1<<16); /* Set burst mode and start A/D convert */
return; /* the ADC reading is done inside the
handler, return 0. */
}
/*********************************************************************************
** End Of File
*********************************************************************************/
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