Diff: ADS1015.cpp

Revision:

0:94493b8b0fb0

Child:

1:c1ddf7c2d65b

diff -r 000000000000 -r 94493b8b0fb0 ADS1015.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ADS1015.cpp	Tue Jun 26 13:30:53 2018 +0000
@@ -0,0 +1,53 @@
+#include "mbed.h"
+#include "ADS1015.h"
+
+void startSingleShotConversion(I2C* i2c_plate, uint8_t address, uint16_t config)
+{
+    char txbuf[10];
+    // set mux to correct input
+    txbuf[0] = AD1015_REG_CONFIG;
+    txbuf[1] = config >> 8;
+    txbuf[2] = config & 0xFF;
+    i2c_plate->write(address, txbuf, 3);
+}
+
+double readConversionResult(I2C* i2c_plate, uint8_t address, uint16_t config)
+{
+    int16_t raw_data;
+    char rxbuf[10];
+    char txbuf[10];
+    txbuf[0] = AD1015_REG_CONVERSION_RESULT;
+    i2c_plate->write(address, txbuf, 1, true);
+    i2c_plate->read(address, rxbuf, 2);
+    raw_data = (rxbuf[0] << 8) | rxbuf[1];
+    return data_to_voltage(raw_data, config);
+}
+
+double data_to_voltage(int16_t data, uint16_t config)
+{
+    double voltage;
+    data = data >> 4;
+    switch(config & 0x0E00) {
+        case AD1015_CONFIG_FSR_6144:
+            voltage = 0.003 * (double)data;
+            break;
+        case AD1015_CONFIG_FSR_4096:
+            voltage = 0.002 * (double)data;
+            break;
+        case AD1015_CONFIG_FSR_2048:
+            voltage = 0.001 * (double)data;
+            break;
+        case AD1015_CONFIG_FSR_1024:
+            voltage = 0.0005 * (double)data;
+            break;
+        case AD1015_CONFIG_FSR_0512:
+            voltage = 0.00025 * (double)data;
+            break;
+        case AD1015_CONFIG_FSR_0256:
+            voltage = 0.000125 * (double)data;
+            break;
+        default:
+            break;
+    }
+    return voltage;
+}