Diff: EMAC/Easy_Web/ADC.c

Revision:

0:bf7b9fba3924

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/EMAC/Easy_Web/ADC.c	Sun Mar 20 05:38:56 2011 +0000
@@ -0,0 +1,80 @@
+/*----------------------------------------------------------------------------
+ * Name:    ADC.c
+ * Purpose: MCB1700 low level ADC functions
+ * Version: V1.00
+ * Note(s):
+ *----------------------------------------------------------------------------
+ * This file is part of the uVision/ARM development tools.
+ * This software may only be used under the terms of a valid, current,
+ * end user licence from KEIL for a compatible version of KEIL software
+ * development tools. Nothing else gives you the right to use this software.
+ *
+ * This software is supplied "AS IS" without warranties of any kind.
+ *
+ * Copyright (c) 2009 Keil - An ARM Company. All rights reserved.
+ *----------------------------------------------------------------------------
+ * History:
+ *          V1.00 Initial Version
+ *----------------------------------------------------------------------------*/
+
+#include "LPC17xx.h"                             /* LPC17xx definitions */
+#include "ADC.h"
+
+/*----------------------------------------------------------------------------
+  initialize ADC Pins
+ *----------------------------------------------------------------------------*/
+void ADC_init (void) {
+#ifdef MCB_LPC_1768
+	/* Using MCB1700 board :
+	 * ADC channel 2 is available
+	 */
+  LPC_PINCON->PINSEL1 &= ~(3<<18);                   /* P0.25 is GPIO */
+  LPC_PINCON->PINSEL1 |=  (1<<18);                   /* P0.25 is AD0.2 */
+
+  LPC_SC->PCONP       |=  (1<<12);                   /* Enable power to ADC block */
+
+  LPC_ADC->ADCR        =  (1<< 2) |                  /* select AD0.2 pin */
+                      (1<< 8) |
+                      (1<<21);                   /* enable ADC */
+#elif defined(IAR_LPC_1768)
+  /* Using IAR LPC1768 KickStart board
+   * ADC channel 5 is available
+   */
+   LPC_PINCON->PINSEL3 |=  (3<<30);                   /* P1.31 is AD0.5 */
+
+   LPC_SC->PCONP       |=  (1<<12);                   /* Enable power to ADC block */
+
+   LPC_ADC->ADCR        =  (1<<5) |               /* select AD0.5 pin */
+                       (1<< 8) |
+                       (1<<21);                   /* enable ADC */
+#endif
+}
+
+
+/*----------------------------------------------------------------------------
+  start ADC Conversion
+ *----------------------------------------------------------------------------*/
+void ADC_startCnv (void) {
+	LPC_ADC->ADCR &= ~(7<<24);                         /* stop conversion  */
+	LPC_ADC->ADCR |=  (1<<24);                         /* start conversion */
+}
+
+
+/*----------------------------------------------------------------------------
+  stop ADC Conversion
+ *----------------------------------------------------------------------------*/
+void ADC_stopCnv (void) {
+	LPC_ADC->ADCR &= ~(7<<24);                         /* stop conversion */
+}
+
+
+/*----------------------------------------------------------------------------
+  get converted ADC value
+ *----------------------------------------------------------------------------*/
+uint32_t ADC_getCnv (void) {
+  uint32_t adGdr;
+
+  while (!(LPC_ADC->ADGDR & (1UL<<31)));             /* Wait for Conversion end */
+  adGdr = LPC_ADC->ADGDR;
+  return((adGdr >> 4) & ADC_VALUE_MAX);          /* read converted value */
+}