adc.zip_lpc3250

/*********************************************************************** * $Id$ * * Project: EA LPC3250 simple ADC example * * Description: This simple ADC example uses interrupts to measure * ADIN0, ADI01 (accelerometer) and ADIN2 (trimpot) * *********************************************************************** * Software that is described herein is for illustrative purposes only * which provides customers with programming information regarding the * products. This software is supplied "AS IS" without any warranties. * NXP Semiconductors assumes no responsibility or liability for the * use of the software, conveys no license or title under any patent, * copyright, or mask work right to the product. NXP Semiconductors * reserves the right to make changes in the software without * notification. NXP Semiconductors also make no representation or * warranty that such application will be suitable for the specified * use without further testing or modification. **********************************************************************/ #include <stdio.h> #include <string.h> #include "lpc_types.h" #include "lpc_arm922t_cp15_driver.h" #include "lpc_irq_fiq.h" #include "lpc32xx_chip.h" #include "lpc32xx_intc_driver.h" #include "lpc32xx_clkpwr_driver.h" #include "lpc32xx_adc_driver.h" #include "lpc32xx_uart_driver.h" #include "lpc32xx_timer_driver.h" #include "uart.h" /* Prototype for external IRQ handler */ void lpc32xx_irq_handler(void); /* ADC device handle */ static INT_32 adcdev; /* UART buffer */ static char buff[512]; /* ADC variables*/ volatile UNS_32 adc_int, adc_data; /*********************************************************************** * * Function: adc_user_interrupt * * Purpose: ADC user interrupt handler * * Processing: * On an interrupt read * the data from the ADC * * Parameters: None * * Outputs: None * * Returns: Nothing * * Notes: None * **********************************************************************/ void adc_user_interrupt(void) { /* A read of the ADC data register will clear the ADC interrupt */ /* Read the ADC result */ adc_data = (ADC->adc_dat & TSC_ADCDAT_VALUE_MASK) ; /* Set the Flag to tell main application we got the interrupt*/ adc_int++ /* = 1*/; } static UNS_32 read_adc0(void) { adc_int = 0; /* select channel for converion */ adc_ioctl(adcdev, ADC_CH_SELECT, ADCSEL_CH_0); /* start A/D convert */ adc_ioctl(adcdev, START_CONVERSION, 0); /* wait for conversion to complete */ while (!adc_int); return adc_data; } static UNS_32 read_adc1(void) { adc_int = 0; /* select channel for converion */ adc_ioctl(adcdev, ADC_CH_SELECT, ADCSEL_CH_1); /* start A/D convert */ adc_ioctl(adcdev, START_CONVERSION, 0); /* wait for conversion to complete */ while (!adc_int); return adc_data; } static UNS_32 read_adc2(void) { adc_int = 0; /* select channel for converion */ adc_ioctl(adcdev, ADC_CH_SELECT, ADCSEL_CH_2); /* start A/D convert */ adc_ioctl(adcdev, START_CONVERSION, 0); /* wait for conversion to complete */ while (!adc_int); return adc_data; } /*********************************************************************** * * Function: c_entry * * Purpose: Application entry point from the startup code * * Processing: * See function. * * Parameters: None * * Outputs: None * * Returns: Nothing * * Notes: None * **********************************************************************/ void c_entry(void) { /* Disable interrupts in ARM core */ disable_irq_fiq(); /* Set virtual address of MMU table */ cp15_set_vmmu_addr((void *) (IRAM_BASE + (256 * 1024) - (16 * 1024))); /* Initialize interrupt system */ int_initialize(0xFFFFFFFF); /* Install standard IRQ dispatcher at ARM IRQ vector */ int_install_arm_vec_handler(IRQ_VEC, (PFV) lpc32xx_irq_handler); /* Setup miscellaneous board functions */ // ea3250_board_init(); /* Install adc handler as a IRQ interrupts */ int_install_irq_handler(IRQ_TS_IRQ, (PFV) adc_user_interrupt); /* Enable ADC interrupt in the interrupt controller */ int_enable(IRQ_TS_IRQ); /* ADC conversion, RTC CLK mode. */ /* Enable 32KHz clock to ADC block */ clkpwr_clk_en_dis(CLKPWR_ADC_CLK,1); /* Open the ADC device */ adcdev = adc_open(ADC , 0); /* Reset flag */ adc_int = 0; /* enable interupts */ enable_irq(); uart_output_init(); while(1) { /* a0 & a1 -> accelerometer */ /* a2 -> trimpot */ UNS_32 a0 = read_adc0(); UNS_32 a1 = read_adc1(); UNS_32 a2 = read_adc2(); sprintf(buff, "a0=%d, a1=%d, a2=%d\r\n", a0,a1,a2); uart_output((UNS_8*)buff); timer_wait_ms(TIMER_CNTR0, 500); } /* close the ADC */ // adc_close(adcdev); /* Loop here forever */ // while (1); }