fix(port): fix discarded qualifiers warning @isthaison (#22)

Closes #22

Author: Lzw655

idf_component.yml

@@ -1,4 +1,4 @@
-version: "1.1.0"
+version: "1.1.1"
 description: ESP32_IO_Expander is a library designed for driving IO expander chips using ESP SoCs
 url: https://github.com/esp-arduino-libs/ESP32_IO_Expander
 repository: https://github.com/esp-arduino-libs/ESP32_IO_Expander.git

library.properties

@@ -1,5 +1,5 @@
 name=ESP32_IO_Expander
-version=1.1.0
+version=1.1.1
 author=espressif
 maintainer=espressif
 sentence=ESP32_IO_Expander is a library designed for driving IO expander chips using ESP SoCs

src/port/esp_io_expander.c

@@ -26,7 +26,7 @@ typedef enum {
     REG_DIRECTION,
 } reg_type_t;
 
-static char *TAG = "io_expander";
+static const char *TAG = "io_expander";
 
 static esp_err_t write_reg(esp_io_expander_handle_t handle, reg_type_t reg, uint32_t value);
 static esp_err_t read_reg(esp_io_expander_handle_t handle, reg_type_t reg, uint32_t *value);

src/port/esp_io_expander_ht8574.c

@@ -40,7 +40,7 @@ typedef struct {
     } regs;
 } esp_io_expander_ht8574_t;
 
-static char *TAG = "ht8574";
+static const char *TAG = "ht8574";
 
 static esp_err_t read_input_reg(esp_io_expander_handle_t handle, uint32_t *value);
 static esp_err_t write_output_reg(esp_io_expander_handle_t handle, uint32_t value);

src/port/esp_io_expander_tca9554.c

@@ -45,7 +45,7 @@ typedef struct {
     } regs;
 } esp_io_expander_tca9554_t;
 
-static char *TAG = "tca9554";
+static const char *TAG = "tca9554";
 
 static esp_err_t read_input_reg(esp_io_expander_handle_t handle, uint32_t *value);
 static esp_err_t write_output_reg(esp_io_expander_handle_t handle, uint32_t value);

src/port/esp_io_expander_tca95xx_16bit.c

@@ -45,7 +45,7 @@ typedef struct {
     } regs;
 } esp_io_expander_tca95xx_16bit_t;
 
-static char *TAG = "tca95xx_16";
+static const char *TAG = "tca95xx_16";
 
 static esp_err_t read_input_reg(esp_io_expander_handle_t handle, uint32_t *value);
 static esp_err_t write_output_reg(esp_io_expander_handle_t handle, uint32_t value);