Init

main/hw/mcp23018.c

@@ -0,0 +1,51 @@
+#include "mcp23018.h"
+// Local buffer for tracking GPIO state
+
+i2c_device_config_t MCP23018_DEV_CFG = {
+    .dev_addr_length = I2C_ADDR_BIT_LEN_7,
+    .device_address = 0x20,
+    .scl_speed_hz = 100000,
+};
+
+i2c_master_dev_handle_t MCP23018_DEV_HANDLE;
+uint8_t gpioa_state = 0x00; // All LOW initially
+uint8_t gpiob_state = 0x00; // All LOW initially
+
+void mcp23018_set_pin(i2c_master_dev_handle_t dev_handle, uint8_t pin, uint8_t value)
+{
+    if (pin < 8)
+    {
+        // GPIOA (Pins 0-7)
+        if (value)
+            gpioa_state |= (1 << pin); // Set bit
+        else
+            gpioa_state &= ~(1 << pin); // Clear bit
+
+        // Write updated buffer to MCP23018
+        i2c_write_register_8(dev_handle, MCP23018_GPIOA, gpioa_state);
+    }
+    else if (pin < 16)
+    {
+        // GPIOB (Pins 8-15)
+        uint8_t pinB = pin - 8;
+        if (value)
+            gpiob_state |= (1 << pinB); // Set bit
+        else
+            gpiob_state &= ~(1 << pinB); // Clear bit
+
+        // Write updated buffer to MCP23018
+        i2c_write_register_8(dev_handle, MCP23018_GPIOB, gpiob_state);
+    }
+}
+
+void mcp23018_init()
+{
+    ESP_ERROR_CHECK(i2c_master_bus_add_device(i2c0_bus_hdl, &MCP23018_DEV_CFG, &MCP23018_DEV_HANDLE));
+    i2c_write_register_8(MCP23018_DEV_HANDLE, MCP23018_IODIRA, gpioa_state);
+    i2c_write_register_8(MCP23018_DEV_HANDLE, MCP23018_IODIRB, gpiob_state);
+    mcp23018_set_pin(MCP23018_DEV_HANDLE, MCP_CS_ADC_CO, 1);
+    mcp23018_set_pin(MCP23018_DEV_HANDLE, MCP_CS_ADC_NH3, 1);
+    mcp23018_set_pin(MCP23018_DEV_HANDLE, MCP_CS_ADC_NO2, 1);
+    mcp23018_set_pin(MCP23018_DEV_HANDLE, MCP_CS_ADC_UVC, 1);
+    mcp23018_set_pin(MCP23018_DEV_HANDLE, MCP_LORA_RST, 1);
+}