system.c

#include "system.h"
#include "CH554_SDCC.h"
#include "compiler.h"
#include <stdio.h>

#define UART0_BUAD 57600

/** \brief 配置系统时钟
 *
 * \param void
 * \return void
 *
 */
void CfgSysClock()
{
    SAFE_MOD = 0x55; //Enter unsafe mode
    SAFE_MOD = 0xAA;
    CLOCK_CFG = CLOCK_CFG & ~MASK_SYS_CK_SEL | 0x06; // 24MHz
    SAFE_MOD = 0x00;
}

/** \brief 初始化UART
 *
 */
void InitUART()
{
    uint32_t x;
    // uint32_t x2;

    SM0 = 0; // 8Bit
    SM1 = 1; // Variable
    SM2 = 0; // Single device

    RCLK = 0; // using timer1 as send/recv clock
    TCLK = 0; //

    PCON |= SMOD; //SMOD = 0; uart slow mode

    /*
    x = 8 * FREQ_SYS / UART0_BUAD / 16;                                       //如果更改主频，注意x的值不要溢出
    x2 = x % 8;
    x /= 10;
    if ( x2 >= 4 ) x ++;                                                       //四舍五入
    */

    x = FREQ_SYS / UART0_BUAD / 16;

    TMOD = TMOD & ~bT1_GATE & ~bT1_CT & ~MASK_T1_MOD | bT1_M1; //0X20，Timer1作为8位自动重载定时器
    T2MOD = T2MOD | bTMR_CLK | bT1_CLK; //Timer1时钟选择
    TH1 = 0 - x; //12MHz晶振,buad/12为实际需设置波特率
    TR1 = 1; //启动定时器1
    TI = 1;
    REN = 1; //串口0接收使能
}

/** \brief 延时x毫秒
 *
 * \param 毫秒数
 * \return
 *
 */
void DelayMs(uint16_t n) // 以mS为单位延时
{
    // md为何会用这么dirty的方法做延时啊
    while (n--) {
        while ((TKEY_CTRL & bTKC_IF) == 0)
            ;
        while (TKEY_CTRL & bTKC_IF)
            ;
    }
}

void PrintHex(uint8_t* data, uint8_t len)
{
    for (int i = 0; i < len; i++) {
        printf_tiny("%x ", data[i]);
    }
}

int putchar(int c)
{
    while (TI == 0)
        ;
    TI = 0;
    SBUF = c;
    return c;
}

int getchar()
{
    while (RI == 0)
        ;
    RI = 0;
    return SBUF;
}