Diff: VEML6075.cpp

Revision:

0:14ccc7ed49fa

Child:

1:8bc12629d49b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/VEML6075.cpp	Fri Feb 05 02:28:12 2016 +0000
@@ -0,0 +1,192 @@
+/*
+ * File description here
+ */
+#include "VEML6075.h"
+
+/* VEML6075 SLAVE ADDRESS AND FUNCTION DESCRIPTION */
+#define REG_UV_CONF  0x00
+#define REG_Reserved  0x01
+#define REG_Reserved  0x02
+#define REG_Reserved  0x03
+#define REG_Reserved  0x04
+#define REG_Reserved  0x05
+#define REG_Reserved  0x06
+#define REG_UVA_Data  0x07
+#define REG_UVD_Data  0x08
+#define REG_UVB_Data  0x09
+#define REG_UVCOMP1_Data  0x0A
+#define REG_UVCOMP2_Data  0x0B
+#define REG_ID  0x0C
+
+// Following magic numbers are from 
+// VISHAY veml6075 Application Note 84339
+// Page 6 
+#define UVA_A_COEF  (2.5)
+#define UVA_B_COEF  (2.5)
+#define UVB_C_COEF  (2.75)
+#define UVB_D_COEF  (2.75)
+#define UVA_sensitivity (0.93)
+#define UVA_CIE_sensitivity (0.093)
+#define UVB_sensitivity (2.1)
+#define UVB_CIE_sensitivity (0.21)
+#define UVA_RESPONSIVITY (0.0011)
+#define UVB_RESPONSIVITY (0.00125)
+
+VEML6075::VEML6075(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr<<1) {
+    // activate the peripheral
+}
+
+VEML6075::~VEML6075() { }
+
+#if 0
+//
+// numdata is supposed to be 2
+//
+void VEML6075::cmdWrite(uint8_t cmd, uint8_t *data, uint8_t numdata)
+{
+   uint8_t buf[3] ;
+
+    buf[0] = cmd ;
+    buf[1] = data[0] ;
+    buf[2] = data[1] ;
+    writeRegs(data, 3) ;
+}
+
+//
+// numdata is supposed to be 2
+//
+
+void VEML6075::cmdRead(uint8_t cmd, uint8_t *data, uint8_t numdata)
+{
+    uint8_t buf[1] ;
+    buf[0] = cmd ;
+    m_i2c.write(m_addr, buf, 1, true) ; // writing command 
+    m_i2c.read(m_addr, (char*)data, numdata) ;
+}
+#endif 
+
+void VEML6075::getUVConf(uint8_t *uvconf)
+{
+    uint8_t data[2] ;
+    readRegs(REG_UV_CONF, data, 2) ;
+    *uvconf = data[0] ;
+}
+
+void VEML6075::setUVConf(uint8_t uvconf)
+{
+     uint8_t data[3] ;
+     data[0] = REG_UV_CONF ;
+     data[1] = uvconf ;
+     data[2] = 0 ;
+     writeRegs(data, 3) ;
+}
+
+
+void VEML6075::getUVAData(uint16_t *uvadata)
+{
+    uint8_t data[2] ;
+    readRegs(REG_UVA_Data, data, 2) ;
+    *uvadata = (data[1]<<8) | data[0] ;
+}
+
+void VEML6075::getUVBData(uint16_t *uvbdata)
+{
+    uint8_t data[2] ;
+    readRegs(REG_UVB_Data, data, 2) ;
+    *uvbdata = (data[1]<<8) | data[0] ;
+}
+
+void VEML6075::getUVDData(uint16_t *uvddata)
+{
+    uint8_t data[2] ;
+    readRegs(REG_UVD_Data, data, 2) ;
+    *uvddata = (data[1]<<8) | data[0] ;
+}
+
+float VEML6075::UVI(void)
+{
+    float uvi = 0.0 ;
+    uint16_t uvacomp = 0.0 ;
+    uint16_t uvbcomp = 0.0 ;
+    uint16_t uva, uvb, uvd, uvcomp1, uvcomp2 ;
+    getUVAData(&uva) ;
+    getUVBData(&uvb) ;
+    getUVDData(&uvd) ;
+    getUVCOMP1Data(&uvcomp1) ;
+    getUVCOMP2Data(&uvcomp2) ;
+    uvacomp = (uva - uvd) - UVA_A_COEF * (uvcomp1 - uvd) - UVA_B_COEF * (uvcomp2 - uvd) ;
+    uvbcomp = (uvb - uvd) - UVB_C_COEF * (uvcomp1 - uvd) - UVB_D_COEF * (uvcomp2 - uvd) ;
+//    uvi = (((float)uvbcomp * (float)UVB_RESPONSIVITY) + ((float)uvacomp * (float)UVA_RESPONSIVITY)) / 2.0 * 15 ; // For demo
+    uvi = (((float)uvbcomp * (float)UVB_RESPONSIVITY) + ((float)uvacomp * (float)UVA_RESPONSIVITY)) / 2.0 ;
+    return( uvi ) ;
+}
+
+// usage
+// fvalue = veml->getUVA() ;
+// printf("%f", fvalue) ;
+float VEML6075::getUVA(void) 
+{
+    uint16_t data ;
+    float value ;
+    getUVAData(&data) ;
+    value = (float)data / (float)UVA_sensitivity  ;
+    return( value ) ;
+}
+
+float VEML6075::getUVA_CIE(void) 
+{
+    uint16_t data ;
+    float value ;
+    getUVAData(&data) ;
+    value = (float)data / (float)UVA_CIE_sensitivity  ;
+    return( value ) ;
+}
+
+float VEML6075::getUVB(void)
+{
+    uint16_t data ;
+    float value ;
+    getUVBData(&data) ;
+    value = (float)data / (float)UVB_sensitivity  ;
+    return( value ) ;
+}
+
+float VEML6075::getUVB_CIE(void)
+{
+    uint16_t data ;
+    float value ;
+    getUVBData(&data) ;
+    value = (float)data / (float)UVB_CIE_sensitivity  ;
+    return( value ) ;
+}
+
+void VEML6075::getUVCOMP1Data(uint16_t *uvcomp1data)
+{
+    uint8_t data[2] ;
+    readRegs(REG_UVCOMP1_Data, data, 2) ;
+    *uvcomp1data = (data[1]<<8) | data[0] ;
+}
+
+void VEML6075::getUVCOMP2Data(uint16_t *uvcomp2data)
+{
+    uint8_t data[2] ;
+    readRegs(REG_UVCOMP2_Data, data, 2) ;
+    *uvcomp2data = (data[1]<<8) | data[0] ;
+}
+
+void VEML6075::getID(uint16_t *id)
+{
+    uint8_t data[2] ;
+    readRegs(REG_ID, data, 2) ;
+    *id = (data[1]<<8) | data[0] ;
+}
+
+void VEML6075::readRegs(int addr, uint8_t * data, int len) {
+    char t[1] = {addr};
+    m_i2c.write(m_addr, t, 1, true);
+    m_i2c.read(m_addr, (char *)data, len);
+}
+
+void VEML6075::writeRegs(uint8_t * data, int len) {
+    m_i2c.write(m_addr, (char *)data, len);
+}
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