 | By Tauno Erik on 15. Jul 2024 | Output modes There are two different output modes: - Open drain output: GPIO_Mode_Out_OD
- Push-pull output: GPIO_Mode_Out_PP
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
Input modes There are four different input modes: - Floating input: GPIO_Mode_IN_FLOATING
- Pull-up input: GPIO_Mode_IPU
- Pull-down input: GPIO_Mode_IPD
- Analog input: GPIO_Mode_AIN
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
Alternate functions The GPIO can also be configured as an "alternate function". Used for specific hardware functions like pulse width modulation (PWM) or serial peripheral interface (SPI). The modes for alternate functions can be: - Open drain: GPIO_Mode_AF_OD
- Push-pull: GPIO_Mode_AF_PP
Speed There are three-speed options: - GPIO_Speed_2MHz
- GPIO_Speed_10MHz
- GPIO_Speed_50MHz
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
Output Function -
GPIO_SetBits - used for setting the GPIO High (1) -
GPIO_ResetBits - used for setting the GPIO Low (0) -
GPIO_WriteBit - used when you want to SET (High) and REST (Low) the GPIO with the same function -
GPIO_Write - to set the complete GPIO port -
GPIO_PinLockConfig - special function. Helps you lock the pin so that accidentally in other parts of the configuration can't be changed. GPIO_SetBits(GPIOD, GPIO_Pin_0); GPIO_ResetBits(GPIOD, GPIO_Pin_0); GPIO_WriteBit(GPIOD, GPIO_Pin_0, SET); GPIO_WriteBit(GPIOD, GPIO_Pin_0, RESET); GPIO_WriteBit(GPIOC, GPIO_Pin_0, 1);
Input functions -
GPIO_ReadInputDataBit - used to get the status of a single pin (high or low) -
GPIO_ReadInputData - used to read the full port u8 pin_status = GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_3);
5V tolerant Pins 5V tolerant pins are PC1, PC2, PC4, PC5 and PC6. PD7 - Reset Pin PD7 is by default configured as a reset pin. To change it to a regular GPIO pin: FLASH_Unlock(); FLASH_EraseOptionBytes(); FLASH_UserOptionByteConfig(OB_STOP_NoRST, OB_STDBY_NoRST, OB_RST_NoEN, OB_PowerON_Start_Mode_USER); FLASH_Unlock();
Code /********************************** (C) COPYRIGHT ******************************* * File Name : main.c * Date : 15.07.2024 * Autor : Tauno Erik * Description : GPIO Input/Output *********************************************************************************/ #include "debug.h" /* Global define */ #define HIGH 1 #define LOW 0 #define INPUT 0 #define OUTPUT 1 #define PC0 0 #define PC1 1 #define PC2 2 #define PC3 3 #define PC4 4 #define PC5 5 #define PC6 6 #define PC7 7 #define PD0 8 #define PD1 9 #define PD2 10 #define PD3 11 #define PD4 12 #define PD5 13 #define PD6 14 #define PD7 15 // RST #define PA1 16 // X1 #define PA2 17 // X0 /********************************************************************* * @fn get_chip_type * * @brief Returns the CHIP identifier. * * @return Device identifier. * ChipID List- * CH32V003F4P6-0x003005x0 * CH32V003F4U6-0x003105x0 * CH32V003A4M6-0x003205x0 * J4M6-0x003305x0 */ uint32_t get_chip_type( void ) { return( *( uint32_t * )0x1FFFF7C4 ); } uint16_t get_MCU_flash_size( void ) { return( *( uint16_t * )0x1FFFF7E0 ); } uint32_t get_MCU_uid_1( void ) { return( *( uint32_t * )0x1FFFF7E8 ); } uint32_t get_MCU_uid_2( void ) { return( *( uint32_t * )0x1FFFF7EC ); } uint32_t get_MCU_uid_3( void ) { return( *( uint32_t * )0x1FFFF7F0 ); } /***************************************************************************************** */ u8 tauno_PIN_read(u8 pin) { u8 val = LOW; switch (pin) { case PA1: // X0 val = GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_1); break; case PA2: // X1 val = GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_2); break; case PC0: val = GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_0); break; case PC1: val = GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_1); break; case PC2: val = GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_2); break; case PC3: val = GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_3); break; case PC4: val = GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_4); break; case PC5: val = GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_5); break; case PC6: val = GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_6); break; case PC7: val = GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_7); break; case PD0: val = GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_0); break; case PD1: val = GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_1); break; case PD2: val = GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_2); break; case PD3: val = GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_3); break; case PD4: val = GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_4); break; case PD5: val = GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_5); break; case PD6: val = GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_6); break; case PD7: // RST val = GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_7); break; default: break; } return val; } /***************************************************************************************** */ void tauno_PIN_write(u8 pin, u8 value) { switch (pin) { case PC0: GPIO_WriteBit(GPIOC, GPIO_Pin_0, value); break; case PC1: GPIO_WriteBit(GPIOC, GPIO_Pin_1, value); break; case PC2: GPIO_WriteBit(GPIOC, GPIO_Pin_2, value); break; case PC3: GPIO_WriteBit(GPIOC, GPIO_Pin_3, value); break; case PC4: GPIO_WriteBit(GPIOC, GPIO_Pin_4, value); break; case PC5: GPIO_WriteBit(GPIOC, GPIO_Pin_5, value); break; case PC6: GPIO_WriteBit(GPIOC, GPIO_Pin_6, value); break; case PC7: GPIO_WriteBit(GPIOC, GPIO_Pin_7, value); break; case PD0: GPIO_WriteBit(GPIOD, GPIO_Pin_0, value); break; case PD1: GPIO_WriteBit(GPIOD, GPIO_Pin_1, value); break; case PD2: GPIO_WriteBit(GPIOD, GPIO_Pin_2, value); break; case PD3: GPIO_WriteBit(GPIOD, GPIO_Pin_3, value); break; case PD4: GPIO_WriteBit(GPIOD, GPIO_Pin_4, value); break; case PD5: GPIO_WriteBit(GPIOD, GPIO_Pin_5, value); break; case PD6: GPIO_WriteBit(GPIOD, GPIO_Pin_6, value); break; case PD7: // RST pin GPIO_WriteBit(GPIOD, GPIO_Pin_7, value); break; case PA1: // External crystal GPIO_WriteBit(GPIOA, GPIO_Pin_1, value); break; case PA2: // External crystal GPIO_WriteBit(GPIOA, GPIO_Pin_2, value); break; default: break; } } /***************************************************************************************** */ void tauno_pin_init(u8 pin, u8 mode) { GPIO_InitTypeDef GPIO_InitStructure = {0}; // Variable used for the GPIO configuration switch (pin) { case PA1: // X0 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; // pin break; case PA2: // X1 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; // pin break; case PC0: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; // pin break; case PC1: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; // pin break; case PC2: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; // pin break; case PC3: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; // pin break; case PC4: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; // pin break; case PC5: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; // pin break; case PC6: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; // pin break; case PC7: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; // pin break; case PD0: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; // pin break; case PD1: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; // pin break; case PD2: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; // pin break; case PD3: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; // pin break; case PD4: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; // pin break; case PD5: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; // pin break; case PD6: RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; // pin break; case PD7: // RST RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); // Enable the clock for Port GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; // pin break; default: break; } if (mode == OUTPUT) { GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; // Push-pull output } else { GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; // Pull-up input } // Speed GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; switch (pin) { case PA1: // X0 case PA2: // X1 GPIO_Init(GPIOA, &GPIO_InitStructure); break; case PC0: case PC1: case PC2: case PC3: case PC4: case PC5: case PC6: case PC7: GPIO_Init(GPIOC, &GPIO_InitStructure); break; case PD0: case PD1: case PD2: case PD3: case PD4: case PD5: case PD6: case PD7: // RST GPIO_Init(GPIOD, &GPIO_InitStructure); break; default: break; } } /***************************************************************************************** */ int main(void) { u8 write_status = LOW; u8 read_status = LOW; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); Delay_Init(); USART_Printf_Init(115200); Delay_Ms(3000); // Give serial monitor time to open printf("Flash size: \t%d\r\n", (unsigned)get_MCU_flash_size); printf("SystemClk: \t%d\r\n", (unsigned)SystemCoreClock); printf("Device ID: \t%08x\r\n", (unsigned)DBGMCU_GetDEVID()); printf("Revision ID: \t%08x\r\n", (unsigned)DBGMCU_GetREVID()); printf("Chip type: \t%08x\r\n", (unsigned)get_chip_type()); printf("UID 1: \t\t%d\r\n", (unsigned)get_MCU_uid_1); printf("UID 2: \t\t%d\r\n", (unsigned)get_MCU_uid_2); printf("UID 3: \t\t%d\r\n", (unsigned)get_MCU_uid_3); printf("GPIO Toggle\r\n"); tauno_pin_init(PD0, OUTPUT); tauno_pin_init(PC3, INPUT); while(1) { Delay_Ms(100); read_status = tauno_PIN_read(PC3); if (read_status == LOW) // Button bressed { write_status = HIGH; // printf("1\r\n"); printf("BUTTON\r\n"); } else { write_status = LOW; // printf("0\r\n"); } tauno_PIN_write(PD0, write_status); } }  External links |
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