- /****************************************************************************
- * [url=home.php?mod=space&uid=288409]@file[/url] main.c
- * [url=home.php?mod=space&uid=895143]@version[/url] V1.00
- * [url=home.php?mod=space&uid=247401]@brief[/url] Show how to use auto baud rate detection function.
- *
- * SPDX-License-Identifier: Apache-2.0
- * [url=home.php?mod=space&uid=17282]@CopyRight[/url] (C) 2017 Nuvoton Technology Corp. All rights reserved.
- *
- ******************************************************************************/
- #include <stdio.h>
- #include "NuMicro.h"
- /*---------------------------------------------------------------------------------------------------------*/
- /* Global variables */
- /*---------------------------------------------------------------------------------------------------------*/
- /*---------------------------------------------------------------------------------------------------------*/
- /* Define functions prototype */
- /*---------------------------------------------------------------------------------------------------------*/
- void SYS_Init(void);
- void UART0_Init(void);
- void AutoBaudRate_Test(void);
- void AutoBaudRate_TxTest(void);
- void AutoBaudRate_RxTest(void);
- uint32_t GetUartBaudrate(UART_T *uart);
- void SYS_Init(void)
- {
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init System Clock */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Unlock protected registers */
- SYS_UnlockReg();
- /* Set XT1_OUT(PF.2) and XT1_IN(PF.3) to input mode */
- PF->MODE &= ~(GPIO_MODE_MODE2_Msk | GPIO_MODE_MODE3_Msk);
- /* Enable HIRC clock (Internal RC 48MHz) */
- CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);
- /* Wait for HIRC clock ready */
- CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);
- /* Select HCLK clock source as HIRC and HCLK source divider as 1 */
- CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));
- /* Set both PCLK0 and PCLK1 as HCLK */
- CLK->PCLKDIV = CLK_PCLKDIV_APB0DIV_DIV1 | CLK_PCLKDIV_APB1DIV_DIV1;
- /* Select IP clock source */
- /* Select UART0 clock source is HIRC and UART module clock divider as 1 */
- CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HIRC, CLK_CLKDIV0_UART0(1));
- /* Enable UART0 peripheral clock */
- CLK_EnableModuleClock(UART0_MODULE);
- /* Update System Core Clock */
- /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
- SystemCoreClockUpdate();
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init I/O Multi-function */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Set PB multi-function pins for UART0 RXD=PB.12 and TXD=PB.13 */
- SYS->GPB_MFPH = (SYS->GPB_MFPH & ~(SYS_GPB_MFPH_PB12MFP_Msk | SYS_GPB_MFPH_PB13MFP_Msk)) | \
- (SYS_GPB_MFPH_PB12MFP_UART0_RXD | SYS_GPB_MFPH_PB13MFP_UART0_TXD);
- /* Lock protected registers */
- SYS_LockReg();
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init UART0 */
- /*---------------------------------------------------------------------------------------------------------*/
- void UART0_Init(void)
- {
- /* Reset UART0 */
- SYS_ResetModule(UART0_RST);
- /* Configure UART0 and set UART0 baud rate */
- UART_Open(UART0, 115200);
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* MAIN function */
- /*---------------------------------------------------------------------------------------------------------*/
- int32_t main(void)
- {
- /* Init System, IP clock and multi-function I/O */
- SYS_Init();
- /* Init UART0 for printf */
- UART0_Init();
- /*---------------------------------------------------------------------------------------------------------*/
- /* SAMPLE CODE */
- /*---------------------------------------------------------------------------------------------------------*/
- printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %dHz\n", SystemCoreClock);
- printf("\nUART Sample Program\n");
- /* UART auto baud rate sample function */
- AutoBaudRate_Test();
- printf("\nUART Sample Program End\n");
- while(1);
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Auto Baud Rate Function Test */
- /*---------------------------------------------------------------------------------------------------------*/
- void AutoBaudRate_Test(void)
- {
- uint32_t u32Item;
- printf("\n");
- printf("+-----------------------------------------------------------+\n");
- printf("| Pin Configure |\n");
- printf("+-----------------------------------------------------------+\n");
- printf("| ______ _____ |\n");
- printf("| | | | | |\n");
- printf("| |Master|--UART0_TXD(PB.13) <==> UART0_RXD(PB.12)--|Slave| |\n");
- printf("| | | | | |\n");
- printf("| |______| |_____| |\n");
- printf("| |\n");
- printf("+-----------------------------------------------------------+\n");
- printf("\n");
- printf("+-----------------------------------------------------------+\n");
- printf("| Auto Baud Rate Function Test |\n");
- printf("+-----------------------------------------------------------+\n");
- printf("| Description : |\n");
- printf("| The sample code needs two boards. One is Master and |\n");
- printf("| the other is slave. Master will send input pattern |\n");
- printf("| 0x1 with different baud rate. It can check if Slave |\n");
- printf("| calculates correct baud rate. |\n");
- printf("+-----------------------------------------------------------+\n");
- printf("| Please select Master or Slave test |\n");
- printf("| [0] Master [1] Slave |\n");
- printf("+-----------------------------------------------------------+\n");
- u32Item = getchar();
- if(u32Item == '0')
- AutoBaudRate_TxTest();
- else
- AutoBaudRate_RxTest();
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Auto Baud Rate Function Tx Test */
- /*---------------------------------------------------------------------------------------------------------*/
- void AutoBaudRate_TxTest(void)
- {
- uint32_t u32Item;
- do
- {
- printf("\n");
- printf("+-----------------------------------------------------------+\n");
- printf("| Auto Baud Rate Function Test (Master) |\n");
- printf("+-----------------------------------------------------------+\n");
- printf("| [1] baud rate 38400 bps |\n");
- printf("| [2] baud rate 57600 bps |\n");
- printf("| [3] baud rate 115200 bps |\n");
- printf("| |\n");
- printf("| Select baud rate and master will send 0x1 to slave ... |\n");
- printf("+-----------------------------------------------------------+\n");
- printf("| Quit - [ESC] |\n");
- printf("+-----------------------------------------------------------+\n\n");
- u32Item = getchar();
- printf("%c\n", u32Item);
- /* Set different baud rate */
- switch(u32Item)
- {
- case '1':
- UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(__HIRC, 38400);
- break;
- case '2':
- UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(__HIRC, 57600);
- break;
- default:
- UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(__HIRC, 115200);
- break;
- }
- /* Send input pattern 0x1 for auto baud rate detection bit length is 1-bit */
- UART_WRITE(UART0, 0x1);
- }
- while(u32Item != 27);
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Get UART Baud Rate Function */
- /*---------------------------------------------------------------------------------------------------------*/
- uint32_t GetUartBaudrate(UART_T *uart)
- {
- uint8_t u8UartClkSrcSel=0, u8UartClkDivNum=0;
- uint32_t u32ClkTbl[] = {0ul, 0ul, 0ul, __HIRC, 0ul, __LIRC};
- uint32_t u32Baud_Div;
- /* Get UART clock source selection and UART clock divider number */
- switch((uint32_t)uart)
- {
- case UART0_BASE:
- u8UartClkSrcSel = (CLK->CLKSEL1 & CLK_CLKSEL1_UART0SEL_Msk) >> CLK_CLKSEL1_UART0SEL_Pos;
- u8UartClkDivNum = (CLK->CLKDIV0 & CLK_CLKDIV0_UART0DIV_Msk) >> CLK_CLKDIV0_UART0DIV_Pos;
- break;
- }
- /* Get PCLK clock frequency if UART clock source selection is PCLK */
- if (u8UartClkSrcSel == 4ul)
- {
- if (uart == (UART_T *)UART0)
- u32ClkTbl[u8UartClkSrcSel] = CLK_GetPCLK0Freq();
- }
- /* Get UART baud rate divider */
- u32Baud_Div = (uart->BAUD & UART_BAUD_BRD_Msk) >> UART_BAUD_BRD_Pos;
- /* Calculate UART baud rate if baud rate is set in MODE 0 */
- if ((uart->BAUD & (UART_BAUD_BAUDM1_Msk | UART_BAUD_BAUDM0_Msk)) == UART_BAUD_MODE0)
- return ((u32ClkTbl[u8UartClkSrcSel]) / (u8UartClkDivNum + 1ul) / (u32Baud_Div + 2ul)) >> 4;
- /* Calculate UART baud rate if baud rate is set in MODE 2 */
- else if ((uart->BAUD & (UART_BAUD_BAUDM1_Msk | UART_BAUD_BAUDM0_Msk)) == UART_BAUD_MODE2)
- return ((u32ClkTbl[u8UartClkSrcSel]) / (u8UartClkDivNum + 1ul) / (u32Baud_Div + 2ul));
- /* Calculate UART baud rate if baud rate is set in MODE 1 */
- else if ((uart->BAUD & (UART_BAUD_BAUDM1_Msk | UART_BAUD_BAUDM0_Msk)) == UART_BAUD_BAUDM1_Msk)
- return ((u32ClkTbl[u8UartClkSrcSel]) / (u8UartClkDivNum + 1ul) / (u32Baud_Div + 2ul)) / (((uart->BAUD & UART_BAUD_EDIVM1_Msk) >> UART_BAUD_EDIVM1_Pos) + 1ul);
- /* Unsupported baud rate setting */
- else
- return 0;
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Auto Baud Rate Function Rx Test */
- /*---------------------------------------------------------------------------------------------------------*/
- void AutoBaudRate_RxTest(void)
- {
- /* Enable auto baud rate detect function */
- UART0->ALTCTL |= UART_ALTCTL_ABRDEN_Msk;
- printf("\nreceiving input pattern... ");
- /* Wait until auto baud rate detect finished or time-out */
- while((UART0->ALTCTL & UART_ALTCTL_ABRIF_Msk) == 0);
- if(UART0->FIFOSTS & UART_FIFOSTS_ABRDIF_Msk)
- {
- /* Clear auto baud rate detect finished flag */
- UART0->FIFOSTS = UART_FIFOSTS_ABRDIF_Msk;
- printf("Baud rate is %dbps.\n", GetUartBaudrate(UART0));
- }
- else if(UART0->FIFOSTS & UART_FIFOSTS_ABRDTOIF_Msk)
- {
- /* Clear auto baud rate detect time-out flag */
- UART0->FIFOSTS = UART_FIFOSTS_ABRDTOIF_Msk;
- printf("Time-out!\n");
- }
- }
- /*** (C) COPYRIGHT 2017 Nuvoton Technology Corp. ***/
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