dmm: vc870: support effective voltage & current

[libsigrok.git] / src / dmm / vc870.c

diff --git a/src/dmm/vc870.c b/src/dmm/vc870.c
index ac04e640c4148d00781d587084c3b2c8e43dfc02..fc795678e6dcb02a3ee68c694eb00180db694fbc 100644 (file)
--- a/src/dmm/vc870.c
+++ b/src/dmm/vc870.c
@@ -46,14 +46,20 @@ static const float factors[][8] = {
        {1e-4,  0,     0,     0,    0,    0,    0,    0},    /* Diode */
        {1e-3,  1e-2,  1e-1,  1,    1e1,  1e2,  1e3,  1e4},  /* Frequency */
        {1e-2,  0,     0,     0,    0,    0,    0,    0},    /* Loop current */
+       /*
+        * Note: Measurements showed that AC and DC differ
+        * in the factors used, although docs say they should
+        * be the same.
+        */
        {1e-8,  1e-7,  0,     0,    0,    0,    0,    0},    /* DCµA */
-       {1e-8,  1e-7,  0,     0,    0,    0,    0,    0},    /* ACµA */
+       {1e-7,  1e-6,  0,     0,    0,    0,    0,    0},    /* ACµA */
        {1e-6,  1e-5,  0,     0,    0,    0,    0,    0},    /* DCmA */
-       {1e-6,  1e-5,  0,     0,    0,    0,    0,    0},    /* ACmA */
+       {1e-5,  1e-4,  0,     0,    0,    0,    0,    0},    /* ACmA */
        {1e-3,  0,     0,     0,    0,    0,    0,    0},    /* DCA */
+       /* TODO: Verify factor for ACA */
        {1e-3,  0,     0,     0,    0,    0,    0,    0},    /* ACA */
        {1e-1,  0,     0,     0,    0,    0,    0,    0},    /* Act+apparent power */
-       {1e-1,  0,     0,     0,    0,    0,    0,    0},    /* Power factor / freq */
+       {1e-3,  0,     0,     0,    0,    0,    0,    0},    /* Power factor / freq */
        {1e-1,  0,     0,     0,    0,    0,    0,    0},    /* V eff + A eff */
 };
 
@@ -61,7 +67,6 @@ static int parse_value(const uint8_t *buf, struct vc870_info *info,
                        float *result)
 {
        int i, intval;
-       float floatval;
 
        /* Bytes 3-7: Main display value (5 decimal digits) */
        if (info->is_open || info->is_ol1) {
@@ -86,13 +91,11 @@ static int parse_value(const uint8_t *buf, struct vc870_info *info,
        intval *= info->is_sign1 ? -1 : 1;
        // intval *= info->is_sign2 ? -1 : 1; /* TODO: Fahrenheit / aux display. */
 
-       floatval = (float)intval;
-
        /* Note: The decimal point position will be parsed later. */
 
-       sr_spew("The display value is %f.", floatval);
+       sr_spew("The display value without comma is %05d.", intval);
 
-       *result = floatval;
+       *result = (float)intval;
 
        return SR_OK;
 }
@@ -147,7 +150,7 @@ static int parse_range(uint8_t b, float *floatval,
                mode = 16; /* Act+apparent power */
        else if (info->is_power_factor_freq)
                mode = 17; /* Power factor / freq */
-       else if (info->is_v_a_eff_value)
+       else if (info->is_v_a_rms_value)
                mode = 18; /* V eff + A eff */
        else {
                sr_dbg("Invalid mode, range byte was: 0x%02x.", b);
@@ -222,7 +225,7 @@ static void parse_flags(const uint8_t *buf, struct vc870_info *info)
                        info->is_power_factor_freq = TRUE;
                else if (buf[1] == 0x32)
                        /* Voltage effective value + current effective value */
-                       info->is_v_a_eff_value = TRUE;
+                       info->is_v_a_rms_value = TRUE;
                break;
        default:
                sr_dbg("Invalid function bytes: %02x %02x.", buf[0], buf[1]);
@@ -334,13 +337,6 @@ static void handle_flags(struct sr_datafeed_analog_old *analog,
                analog->mq = SR_MQ_POWER;
                analog->unit = SR_UNIT_WATT;
        }
-       if (info->is_power_factor_freq) {
-               /* TODO: Handle power factor. */
-               // analog->mq = SR_MQ_POWER_FACTOR;
-               // analog->unit = SR_UNIT_UNITLESS;
-               analog->mq = SR_MQ_FREQUENCY;
-               analog->unit = SR_UNIT_HERTZ;
-       }
        if (info->is_power_apparent_power) {
                analog->mq = SR_MQ_POWER;
                analog->unit = SR_UNIT_WATT;
@@ -348,6 +344,21 @@ static void handle_flags(struct sr_datafeed_analog_old *analog,
                // analog->mq = SR_MQ_APPARENT_POWER;
                // analog->unit = SR_UNIT_VOLT_AMPERE;
        }
+       if (info->is_power_factor_freq) {
+               analog->mq = SR_MQ_POWER_FACTOR;
+               analog->unit = SR_UNIT_UNITLESS;
+               /* TODO: Handle frequency. */
+               // analog->mq = SR_MQ_FREQUENCY;
+               // analog->unit = SR_UNIT_HERTZ;
+       }
+       if (info->is_v_a_rms_value) {
+               analog->mqflags |= SR_MQFLAG_RMS;
+               analog->mq = SR_MQ_VOLTAGE;
+               analog->unit = SR_UNIT_VOLT;
+               /* TODO: Handle effective current value */
+               // analog->mq = SR_MQ_CURRENT;
+               // analog->unit = SR_UNIT_AMPERE;
+       }
 
        /* Measurement related flags */
        if (info->is_ac)