restructured i2c-max split, added BMS unit test

test/bms_test.cpp

@@ -0,0 +1,65 @@
+#include "bms_test.hpp"
+#include "i2c.h"
+#include "max17048.h"
+
+void bms_test_app() {
+  vTaskDelay(pdMS_TO_TICKS(5000));
+  esp_err_t err = i2c_init();
+
+  printf("Error after init: %d\n", err);
+
+  gpio_config_t io_conf = {
+    .pin_bit_mask = (1ULL << maxALRT),
+    .mode         = GPIO_MODE_INPUT,
+    .pull_up_en   = GPIO_PULLUP_ENABLE,
+    .pull_down_en = GPIO_PULLDOWN_DISABLE,
+    .intr_type    = GPIO_INTR_DISABLE,
+  };
+  gpio_config(&io_conf);
+
+  printf("BMS test running. Polling ALRT pin every 1s...\n");
+
+
+  uint8_t msb, lsb;
+  if (max17048_read_reg(MAX17048_REG_STATUS, &msb, &lsb) == ESP_OK) {
+    printf("  STATUS before clear: RI=%d\n", !!(msb & RIbit));
+    printf("  STATUS reg before clear: RI=%x, %x\n", msb, lsb);
+  } else {
+    printf("  STATUS read FAILED\n");
+  }
+
+  err = bms_set_alert_bound_voltages(3.3f, 4.2f);
+  printf("Error after boundV: %d\n", err);
+  err |= bms_clear_status();
+  printf("Error after clearStatus: %d\n", err);
+  err |= bms_clear_alrt();
+  printf("Error after clearALRT: %d\n", err);
+
+  if (max17048_read_reg(MAX17048_REG_STATUS, &msb, &lsb) == ESP_OK) {
+    printf("  STATUS after clear: RI=%d\n", !!(msb & RIbit));
+    printf("  STATUS reg after clear: RI=%x, %x\n", msb, lsb);
+  } else {
+    printf("  STATUS read FAILED\n");
+  }
+  
+  while (true) {
+    int level = gpio_get_level(maxALRT);
+    printf("ALRT pin: %s\n", level ? "HIGH (no alert)" : "LOW (alert asserted)");
+
+    if (level == 0) {
+      if (max17048_read_reg(MAX17048_REG_STATUS, &msb, &lsb) == ESP_OK) {
+        printf("  STATUS: VH=%d  VL=%d  HD=%d  SC=%d\n",
+          !!(msb & VHbit),
+          !!(msb & VLbit),
+          !!(msb & HDbit),
+          !!(msb & SCbit));
+        bms_clear_status();
+        bms_clear_alrt();
+      } else {
+        printf("  STATUS read FAILED\n");
+      }
+    }
+
+    vTaskDelay(pdMS_TO_TICKS(1000));
+  }
+}

test/bms_test.hpp

@@ -0,0 +1,6 @@
+#ifndef BMS_TEST_H
+#define BMS_TEST_H
+
+void bms_test_app();
+
+#endif