[Firmware] M058 - UART

[설명]

- pin3.0과 pin3.1을 UART로 사용한다고 설정함

 

[기본코드]

#include <stdio.h>
#include "M051Series.h"
 
#define PLL_CLOCK           50000000
 
void SYS_Init(void)
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init System Clock                                                                                       */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Enable Internal RC clock */
    CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
 
    /* Waiting for Internal RC clock ready */
    CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
 
    /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
    CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
 
    /* Set core clock as PLL_CLOCK from PLL */
    CLK_SetCoreClock(PLL_CLOCK);
 
    /* Enable UART module clock */
    CLK_EnableModuleClock(UART0_MODULE);
 
    /* Select UART module clock source */
    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
    CLK->CLKSEL1 |= CLK_CLKSEL1_UART_S_PLL;
 
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init I/O Multi-function                                                                                 */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Set P3 multi-function pins for UART0 RXD and TXD */
    SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk);
    SYS->P3_MFP |= (SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0);
}
 
void UART0_Init()
{
    /*---------------------------------------------------------------------------------------------------------*/
    /* Init UART                                                                                               */
    /*---------------------------------------------------------------------------------------------------------*/
    /* Reset UART0 */
    SYS_ResetModule(UART0_RST);
 
    /* Configure UART0 and set UART0 Baudrate */
    UART_Open(UART0, 115200);
}
 
int main(void)
{
    /* Unlock protected registers */
    SYS_UnlockReg();
 
    /* Init System, peripheral clock and multi-function I/O */
    SYS_Init();
 
    /* Lock protected registers */
    SYS_LockReg();
 
    /* Init UART0 for printf and testing */
    UART0_Init();
    
    while(1)
    {
        printf("\n\nCPU @ %dHz\n", SystemCoreClock);
 
        printf("\n\nUART Sample Program\n");
    }
}