Fix -fpermissive errors

main/gay-ipod-fw.cpp

@@ -28,7 +28,7 @@
 static const char* TAG = "MAIN";
 
 esp_err_t init_i2c(void) {
-  int i2c_port = 0;
+  i2c_port_t port = I2C_NUM_0;
   i2c_config_t config = {
     .mode = I2C_MODE_MASTER,
     .sda_io_num = I2C_SDA_IO,
@@ -42,8 +42,8 @@ esp_err_t init_i2c(void) {
     .clk_flags = 0,
   };
 
-  ESP_ERROR_CHECK(i2c_param_config(i2c_port, &config));
-  ESP_ERROR_CHECK(i2c_driver_install(i2c_port, config.mode, 0, 0, 0));
+  ESP_ERROR_CHECK(i2c_param_config(port, &config));
+  ESP_ERROR_CHECK(i2c_driver_install(port, config.mode, 0, 0, 0));
 
   // TODO: INT line
   // TODO: add devices to the bus (DAC and GPIO expander)

main/gpio-expander.cpp

@@ -22,8 +22,7 @@ esp_err_t GpioExpander::Write() {
   i2c_master_write_byte(handle, port_b_, true);
   i2c_master_stop(handle);
 
-  // TODO: timeout
-  esp_err_t ret = i2c_master_cmd_begin(0, handle, 0);
+  esp_err_t ret = i2c_master_cmd_begin(I2C_NUM_0, handle, PCA8575_TIMEOUT);
 
   i2c_cmd_link_delete(handle);
   return ret;
@@ -43,8 +42,7 @@ esp_err_t GpioExpander::Read() {
   i2c_master_read_byte(handle, &input_b_, I2C_MASTER_LAST_NACK);
   i2c_master_stop(handle);
 
-  // TODO: timeout
-  esp_err_t ret = i2c_master_cmd_begin(0, handle, 0);
+  esp_err_t ret = i2c_master_cmd_begin(I2C_NUM_0, handle, PCA8575_TIMEOUT);
 
   i2c_cmd_link_delete(handle);
   return ret;

main/gpio-expander.h

@@ -8,6 +8,7 @@
 #include "driver/i2c.h"
 
 #define PCA8575_ADDRESS (0x20)
+#define PCA8575_TIMEOUT (5)
 
 namespace gay_ipod {