Mike R
Class similar to AnalogIn that uses burst mode to run continious background conversions so when the input is read, the last value can immediatly be returned. This slightly modified version allows NC pins.
Dependents: Pinscape_Controller
Fork of
FastAnalogIn
by 
Erik -
Revision 9:31184aa1449c, committed 2014-07-12
- Comitter:
- Sissors
- Date:
- Sat Jul 12 10:39:37 2014 +0000
- Parent:
- 8:68082fdde730
- Child:
- 10:afc3b84dbbd6
- Commit message:
- Added K20D50M support
Changed in this revision
--- a/FastAnalogIn.h Sat Jun 28 13:01:27 2014 +0000
+++ b/FastAnalogIn.h Sat Jul 12 10:39:37 2014 +0000
@@ -7,7 +7,7 @@
#include "mbed.h"
#include "pinmap.h"
-#if !defined TARGET_LPC1768 && !defined TARGET_KLXX && !defined TARGET_LPC408X && !defined TARGET_LPC11UXX
+#if !defined TARGET_LPC1768 && !defined TARGET_KLXX && !defined TARGET_LPC408X && !defined TARGET_LPC11UXX && !defined TARGET_K20D5M
#error "Target not supported"
#endif
--- a/FastAnalogIn_KLXX.cpp Sat Jun 28 13:01:27 2014 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,98 +0,0 @@
-#ifdef TARGET_KLXX
-
-#include "FastAnalogIn.h"
-#include "clk_freqs.h"
-
-#define MAX_FADC 6000000
-#define CHANNELS_A_SHIFT 5
-
-FastAnalogIn::FastAnalogIn(PinName pin, bool enabled)
-{
- ADCnumber = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
- if (ADCnumber == (ADCName)NC) {
- error("ADC pin mapping failed");
- }
-
- SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK;
-
- uint32_t port = (uint32_t)pin >> PORT_SHIFT;
- SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
-
- uint32_t cfg2_muxsel = ADC_CFG2_MUXSEL_MASK;
- if (ADCnumber & (1 << CHANNELS_A_SHIFT)) {
- cfg2_muxsel = 0;
- }
-
- // bus clk
- uint32_t PCLK = bus_frequency();
- uint32_t clkdiv;
- for (clkdiv = 0; clkdiv < 4; clkdiv++) {
- if ((PCLK >> clkdiv) <= MAX_FADC)
- break;
- }
- if (clkdiv == 4) //Set max div
- clkdiv = 0x7;
-
- ADC0->SC1[1] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT));
-
- ADC0->CFG1 = ADC_CFG1_ADIV(clkdiv & 0x3) // Clock Divide Select: (Input Clock)/8
- | ADC_CFG1_MODE(3) // (16)bits Resolution
- | ADC_CFG1_ADICLK(clkdiv >> 2); // Input Clock: (Bus Clock)/2
-
- ADC0->CFG2 = cfg2_muxsel // ADxxb or ADxxa channels
- | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable
- | ADC_CFG2_ADHSC_MASK; // High-Speed Configuration
-
- ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference
-
- pinmap_pinout(pin, PinMap_ADC);
-
- //Enable channel
- running = false;
- enable(enabled);
-}
-
-void FastAnalogIn::enable(bool enabled)
-{
- //If currently not running
- if (!running) {
- if (enabled) {
- //Enable the ADC channel
- ADC0->SC3 |= ADC_SC3_ADCO_MASK; // Enable continuous conversion
- ADC0->SC1[0] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT)); //Start conversion
- running = true;
- } else
- disable();
- }
-}
-
-void FastAnalogIn::disable( void )
-{
- //If currently running
- if (running) {
- ADC0->SC3 &= ~ADC_SC3_ADCO_MASK; // Disable continuous conversion
- }
- running = false;
-}
-
-uint16_t FastAnalogIn::read_u16()
-{
- if (!running)
- {
- // start conversion
- ADC0->SC1[0] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT));
- // Wait Conversion Complete
- while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
- }
- if(running && ((ADC0->SC1[0]&ADC_SC1_ADCH_MASK) != (ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT)))))
- {
- running = false;
- enable();
- while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
- }
- // Return value
- return (uint16_t)ADC0->R[0];
-}
-
-#endif //defined TARGET_KLXX
-
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/FastAnalogIn_KLXX_K20D50M.cpp Sat Jul 12 10:39:37 2014 +0000
@@ -0,0 +1,114 @@
+#if defined(TARGET_KLXX) || defined(TARGET_K20D50M)
+
+#include "FastAnalogIn.h"
+#include "clk_freqs.h"
+
+#define MAX_FADC 6000000
+#define CHANNELS_A_SHIFT 5
+
+#ifdef TARGET_K20D50M
+static const PinMap PinMap_ADC[] = {
+ {PTC2, ADC0_SE4b, 0},
+ {PTD1, ADC0_SE5b, 0},
+ {PTD5, ADC0_SE6b, 0},
+ {PTD6, ADC0_SE7b, 0},
+ {PTB0, ADC0_SE8, 0},
+ {PTB1, ADC0_SE9, 0},
+ {PTB2, ADC0_SE12, 0},
+ {PTB3, ADC0_SE13, 0},
+ {PTC0, ADC0_SE14, 0},
+ {PTC1, ADC0_SE15, 0},
+ {NC, NC, 0}
+};
+#endif
+
+FastAnalogIn::FastAnalogIn(PinName pin, bool enabled)
+{
+ ADCnumber = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
+ if (ADCnumber == (ADCName)NC) {
+ error("ADC pin mapping failed");
+ }
+
+ SIM->SCGC6 |= SIM_SCGC6_ADC0_MASK;
+
+ uint32_t port = (uint32_t)pin >> PORT_SHIFT;
+ SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
+
+ uint32_t cfg2_muxsel = ADC_CFG2_MUXSEL_MASK;
+ if (ADCnumber & (1 << CHANNELS_A_SHIFT)) {
+ cfg2_muxsel = 0;
+ }
+
+ // bus clk
+ uint32_t PCLK = bus_frequency();
+ uint32_t clkdiv;
+ for (clkdiv = 0; clkdiv < 4; clkdiv++) {
+ if ((PCLK >> clkdiv) <= MAX_FADC)
+ break;
+ }
+ if (clkdiv == 4) //Set max div
+ clkdiv = 0x7;
+
+ ADC0->SC1[1] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT));
+
+ ADC0->CFG1 = ADC_CFG1_ADIV(clkdiv & 0x3) // Clock Divide Select: (Input Clock)/8
+ | ADC_CFG1_MODE(3) // (16)bits Resolution
+ | ADC_CFG1_ADICLK(clkdiv >> 2); // Input Clock: (Bus Clock)/2
+
+ ADC0->CFG2 = cfg2_muxsel // ADxxb or ADxxa channels
+ | ADC_CFG2_ADACKEN_MASK // Asynchronous Clock Output Enable
+ | ADC_CFG2_ADHSC_MASK; // High-Speed Configuration
+
+ ADC0->SC2 = ADC_SC2_REFSEL(0); // Default Voltage Reference
+
+ pinmap_pinout(pin, PinMap_ADC);
+
+ //Enable channel
+ running = false;
+ enable(enabled);
+}
+
+void FastAnalogIn::enable(bool enabled)
+{
+ //If currently not running
+ if (!running) {
+ if (enabled) {
+ //Enable the ADC channel
+ ADC0->SC3 |= ADC_SC3_ADCO_MASK; // Enable continuous conversion
+ ADC0->SC1[0] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT)); //Start conversion
+ running = true;
+ } else
+ disable();
+ }
+}
+
+void FastAnalogIn::disable( void )
+{
+ //If currently running
+ if (running) {
+ ADC0->SC3 &= ~ADC_SC3_ADCO_MASK; // Disable continuous conversion
+ }
+ running = false;
+}
+
+uint16_t FastAnalogIn::read_u16()
+{
+ if (!running)
+ {
+ // start conversion
+ ADC0->SC1[0] = ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT));
+ // Wait Conversion Complete
+ while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
+ }
+ if(running && ((ADC0->SC1[0]&ADC_SC1_ADCH_MASK) != (ADC_SC1_ADCH(ADCnumber & ~(1 << CHANNELS_A_SHIFT)))))
+ {
+ running = false;
+ enable();
+ while ((ADC0->SC1[0] & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK);
+ }
+ // Return value
+ return (uint16_t)ADC0->R[0];
+}
+
+#endif //defined TARGET_KLXX
+