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