CH592 GPIO

The files currently target the ch582f chip, they will be updated in due course. But the chips are basically identical.

We have seen the blinky project previously. In this note we will study the main.c and HAL functions of the SDK pertinent to GPIO module.

Here's the blinky main.c again:

#include "CH58x_common.h"

void board_led_init(void)
{
    GPIOA_SetBits(GPIO_Pin_8);
    GPIOA_ModeCfg(GPIO_Pin_8, GPIO_ModeOut_PP_5mA);
}

void board_led_toggle(void)
{
    GPIOA_InverseBits(GPIO_Pin_8);
}

void board_led_set(uint8_t set)
{
    if (set)
        GPIOA_ResetBits(GPIO_Pin_8);
    else
        GPIOA_SetBits(GPIO_Pin_8);
}

int main()
{
    uint8_t s;
    SetSysClock(CLK_SOURCE_PLL_60MHz);

    board_led_init();

    while(1)
    {
      mDelaymS(100);
      board_led_toggle(); 
      mDelaymS(100);
    }
}

Clock setup

Note that these chips use only a fixed external crystal of 32MHz for operation!

The HAL files are located in vendor/StdPeriphDriver. Headers are in the inc subdirectory.

As you can see the clock is set for 60MHz operation. In the CH58x_common.h file it is defined:

#ifndef	 FREQ_SYS
#define  FREQ_SYS		60000000
#endif

So if we are going to configure other than 60Mhz system clock, we need to specifiy in main.c before including CH58x_common.h:

#define  FREQ_SYS		80000000    // 80MHz
#include "CH58x_common.h"

We will use the default 60Mhz, so we wont explicitly define in our file.

We then need to configure the clock in the main function:

SetSysClock(CLK_SOURCE_PLL_60MHz);

Delays

We can use the delay function also defined in CH58x_sys.h, for micro and milli seconds respectively.

void mDelayuS(uint16_t t);
void mDelaymS(uint16_t t);

GPIO

The ch582F chip has 20 GPIOs:

Note on Alternate Functions

To use the pins as I/O for respective peripherals, the Alternate Functions system is used. After reset, all I/O are GPIO by default.

To set the relevant pin as I/O for required peripheral module, set the pin mode as shown in section 7.3.2 in the datasheet. This table shows the suggested mode required for the module. To see the designated pin for each module, see table 7-7. When the module (peripheral) is configured, it will automatically enable the Alternate Function on the attached pin.

Each module also has a secondary pin designated, known as Remap, which is also shown in the table. To activate the remap use the function as defined in the gpio header,

void GPIOPinRemap(FunctionalState s, uint16_t perph);

Mode Config

See the gpio header for various gpio configuration and setting the output..