A basic Library for the 16 bit Differential A/D in the K64F Freedom platform
This Library cn use either A2D0 or 1. Note that when using A2D0 you must use pins ADC0_DP1 and ADC0_DM1. For A2D1 you must use pins ADC1_DP1 and ADC1_DM1.
AnalohIn_Diff.cpp@1:7b36e4381d83, 2014-05-22 (annotated)
- Committer:
- JimCarver
- Date:
- Thu May 22 17:40:21 2014 +0000
- Revision:
- 1:7b36e4381d83
- Parent:
- 0:0f6f4be28e21
Now supports either Channel 0 or 1 for both ADC0 & ADC1
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
JimCarver | 0:0f6f4be28e21 | 1 | #include "mbed.h" |
JimCarver | 0:0f6f4be28e21 | 2 | #include "AnalogIn_Diff.h" |
JimCarver | 0:0f6f4be28e21 | 3 | |
JimCarver | 0:0f6f4be28e21 | 4 | |
JimCarver | 1:7b36e4381d83 | 5 | AnalogIn_Diff::AnalogIn_Diff(int a2d_number) : ch(a2d_number) { |
JimCarver | 1:7b36e4381d83 | 6 | if(ch) BW_SIM_SCGC3_ADC1(1); // Turn on clock as needed |
JimCarver | 0:0f6f4be28e21 | 7 | else BW_SIM_SCGC6_ADC0(1); |
JimCarver | 1:7b36e4381d83 | 8 | BW_ADC_SC1n_DIFF(ch, 0, 1); // Differential Mode |
JimCarver | 1:7b36e4381d83 | 9 | BW_ADC_CFG1_ADICLK(ch, 0); // Bus Clock |
JimCarver | 1:7b36e4381d83 | 10 | BW_ADC_CFG1_MODE(ch, 3); // 16Bit differential mode |
JimCarver | 1:7b36e4381d83 | 11 | BW_ADC_CFG1_ADLSMP(ch, 0); // Short Sample Window |
JimCarver | 1:7b36e4381d83 | 12 | BW_ADC_CFG1_ADIV(ch, 3); // Clock / 8 |
JimCarver | 1:7b36e4381d83 | 13 | BW_ADC_CFG1_ADLPC(ch, 0); // Normal Power Mode |
JimCarver | 0:0f6f4be28e21 | 14 | } |
JimCarver | 0:0f6f4be28e21 | 15 | |
JimCarver | 0:0f6f4be28e21 | 16 | AnalogIn_Diff::~AnalogIn_Diff() { } |
JimCarver | 0:0f6f4be28e21 | 17 | |
JimCarver | 1:7b36e4381d83 | 18 | int16_t AnalogIn_Diff::read_16(int channel) { // Returns a 16bit signed integer |
JimCarver | 1:7b36e4381d83 | 19 | BW_ADC_SC1n_ADCH(ch, 0, channel); // Trigger Conversion |
JimCarver | 1:7b36e4381d83 | 20 | while(!BR_ADC_SC1n_COCO(ch, 0)); // Wait for conversion to finish |
JimCarver | 1:7b36e4381d83 | 21 | return(BR_ADC_Rn_D(ch, 0)); // Return the result |
JimCarver | 0:0f6f4be28e21 | 22 | } |
JimCarver | 0:0f6f4be28e21 | 23 | |
JimCarver | 1:7b36e4381d83 | 24 | float AnalogIn_Diff::read(int channel) { |
JimCarver | 0:0f6f4be28e21 | 25 | int16_t i; |
JimCarver | 0:0f6f4be28e21 | 26 | float t; |
JimCarver | 1:7b36e4381d83 | 27 | BW_ADC_SC1n_ADCH(ch, 0, channel); |
JimCarver | 0:0f6f4be28e21 | 28 | while(!BR_ADC_SC1n_COCO(ch, 0)); |
JimCarver | 0:0f6f4be28e21 | 29 | i = BR_ADC_Rn_D(ch, 0); |
JimCarver | 0:0f6f4be28e21 | 30 | t = ((float) i); |
JimCarver | 0:0f6f4be28e21 | 31 | t = t / 32768.0f; |
JimCarver | 0:0f6f4be28e21 | 32 | return(t); |
JimCarver | 0:0f6f4be28e21 | 33 | } |