Zakaria ElQotbi / mbed-src

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Diff: targets/hal/TARGET_NXP/TARGET_LPC11U6X/analogin_api.c

Revision:
336:cad63c80acb0
Parent:
285:31249416b6f9
diff -r 6848febe3436 -r cad63c80acb0 targets/hal/TARGET_NXP/TARGET_LPC11U6X/analogin_api.c
--- a/targets/hal/TARGET_NXP/TARGET_LPC11U6X/analogin_api.c	Fri Oct 03 16:45:07 2014 +0100
+++ b/targets/hal/TARGET_NXP/TARGET_LPC11U6X/analogin_api.c	Mon Oct 06 09:15:06 2014 +0100
@@ -66,13 +66,15 @@
     // Enable clock for ADC
     LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 13);
 
-    // Start ADC self-calibration
-    LPC_ADC->CTRL = (1UL << 30);
-    do {
-        tmp =  LPC_ADC->CTRL;
-    } while ((tmp & (1UL << 30)) != 0);
+    // Determine the clock divider for a 500kHz ADC clock during calibration
+    uint32_t clkdiv = (SystemCoreClock / 500000) - 1;
+    
+    // Perform a self-calibration
+    LPC_ADC->CTRL = (1UL << 30) | (clkdiv & 0xFF);
+    while ((LPC_ADC->CTRL & (1UL << 30)) != 0);
 
-    LPC_ADC->CTRL = 1; // Sampling clock: SystemClock divided by 1
+    // Sampling clock: SystemClock divided by 1
+    LPC_ADC->CTRL = 0;
 }
 
 static inline uint32_t adc_read(analogin_t *obj) {