From 9c07c2b85d908f699f8ba590b1d60232157eca90 Mon Sep 17 00:00:00 2001
From: Nathan Perry <np@npry.dev>
Date: Wed, 23 Oct 2024 22:57:18 -0400
Subject: test_fw: read veml and bme

---
 test_fw/src/veml.cpp | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 test_fw/src/veml.cpp

(limited to 'test_fw/src/veml.cpp')

diff --git a/test_fw/src/veml.cpp b/test_fw/src/veml.cpp
new file mode 100644
index 0000000..020a380
--- /dev/null
+++ b/test_fw/src/veml.cpp
@@ -0,0 +1,70 @@
+#include "veml.h"
+
+constexpr float BASE_LUX_PER_LSB = 0.0042f;
+
+using namespace ocularium::veml;
+
+
+uint16_t Config::to_reg() const
+{
+    uint16_t result = 0;
+    
+    result |= shutdown ? 1 : 0;
+    result |= interrupt ? 1 : 0;
+    result |= static_cast<uint8_t>(integration) << 6;
+    result |= static_cast<uint8_t>(gain) << 11;
+
+    return result;
+}
+
+bool VEML::init(const Config& config) {
+    if (chipid() != CHIPID) return false;
+
+    set_config(config);
+    write_reg(Reg::POWER, 0);
+    
+    return true;
+}
+
+uint16_t VEML::chipid() const
+{
+    return read_reg(Reg::CHIPID);
+}
+
+float VEML::lux() const
+{
+    const auto val = read_reg(Reg::LUX) * config.gain_factor();
+
+    return static_cast<float>(val) * BASE_LUX_PER_LSB;
+}
+
+void VEML::set_config(const Config& config)
+{
+    this->config = config;
+    write_reg(Reg::CONFIG, config.to_reg());
+}
+
+void VEML::write_reg(const Reg reg, const uint16_t val) const
+{
+    wire.beginTransmission(ADDR);
+    wire.write(static_cast<uint8_t>(reg));
+    wire.write(val & 0xff);
+    wire.write(val >> 8);
+    wire.endTransmission();
+}
+
+uint16_t VEML::read_reg(const Reg reg) const
+{
+    wire.flush();
+    
+    wire.beginTransmission(ADDR);
+    wire.write(static_cast<uint8_t>(reg));
+    wire.endTransmission(false);
+    wire.requestFrom(ADDR, 2);
+    wire.endTransmission(true);
+    
+    auto result = static_cast<uint16_t>(wire.read());
+    result |= wire.read() << 8;
+
+    return result;
+}
-- 
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