| CGPIOx_Typedef | GPIO port register structure |
| Chal_clock_config_t | System clock configuration structure |
| Chal_i2c_config_t | I²C configuration structure |
| Chal_pll_config_t | PLL (Phase Locked Loop) configuration structure |
| CI2C_Reg_Typedef | I²C peripheral register map |
| CNVIC_Typedef | NVIC register map |
| CPWM_Handle | PWM handle structure linking timer and channel |
| CRCC_Typedef | RCC register map structure |
| CTIMx_Reg_Typedef | |
| CUARTx_Reg_Typedef | UART peripheral register map for STM32F4 |