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标题: UART疑问 [打印本页]

作者: 匿名 时间: 2018-10-2 01:13
标题: UART疑问
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock                                                                                     */
/*---------------------------------------------------------------------------------------------------------*/
//CLK->PWRCON = (CLK->PWRCON & ~(0x0000000Dul)) | 0x0000001Dul;
//CLK->PLLCON = (CLK->PLLCON & ~(0x000FFFFFul)) | 0x00004217ul;
//CLK->CLKDIV = (CLK->CLKDIV & ~(0x00FF0F0Ful)) | 0x00000000ul;
//CLK->CLKSEL0 = (CLK->CLKSEL0 & ~(0x0000003Ful)) | 0x0000003Aul;
//CLK->CLKSEL1 = (CLK->CLKSEL1 & ~(0xF377773Ful)) | 0xAD8888FBul;
//CLK->CLKSEL2 = (CLK->CLKSEL2 & ~(0x000300FCul)) | 0x000200ABul;
//CLK->AHBCLK = (CLK->AHBCLK & ~(0x0000001Cul)) | 0x00000005ul;
//CLK->APBCLK = (CLK->APBCLK & ~(0xD0F3337Dul)) | 0x00030004ul;
//CLK->FRQDIV = (CLK->FRQDIV & ~(0x0000001Ful)) | 0x00000000ul;
//SysTick->CTRL = (SysTick->CTRL & ~(0x00000005ul)) | 0x00000004ul;

/* Unlock protected registers */
SYS_UnlockReg();

/* Enable clock source */
CLK_EnableXtalRC(CLK_PWRCON_OSC10K_EN_Msk|CLK_PWRCON_OSC22M_EN_Msk|CLK_PWRCON_XTL12M_EN_Msk);

/* Waiting for clock source ready */
CLK_WaitClockReady(CLK_CLKSTATUS_OSC10K_STB_Msk|CLK_CLKSTATUS_OSC22M_STB_Msk|CLK_CLKSTATUS_XTL12M_STB_Msk);

/* Disable PLL first to avoid unstable when setting PLL */
CLK_DisablePLL();

/* Set PLL frequency */
CLK->PLLCON = (CLK->PLLCON & ~(0x000FFFFFul)) | 0x00004217ul;

/* Waiting for PLL ready */
CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk);

/* If the defines do not exist in your project, please refer to the related clk.h in the clk_h folder appended to the tool package. */
/* Set HCLK clock */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_PLL, CLK_CLKDIV_HCLK(1));

/* Enable IP clock */
CLK_EnableModuleClock(ISP_MODULE);
CLK_EnableModuleClock(TMR0_MODULE);
//CLK_EnableModuleClock(UART0_MODULE);
CLK_EnableModuleClock(UART1_MODULE);

/* Set IP clock */
CLK_SetModuleClock(TMR0_MODULE, CLK_CLKSEL1_TMR0_S_HXT, MODULE_NoMsk);
//CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_PLL, CLK_CLKDIV_UART(1));
CLK_SetModuleClock(UART1_MODULE, CLK_CLKSEL1_UART_S_PLL, CLK_CLKDIV_UART(1));

/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate SystemCoreClock. */
SystemCoreClockUpdate();

/* Lock protected registers */
SYS_LockReg();
}

void IP_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init TIMER Multi-function                                                                               */
/*---------------------------------------------------------------------------------------------------------*/
/* Open Timer0 frequency to 1 Hz in periodic mode, and enable interrupt */
TIMER_Open(TIMER0, TIMER_PERIODIC_MODE, 100);
TIMER_EnableInt(TIMER0);

/* Enable Timer0 NVIC */
NVIC_EnableIRQ(TMR0_IRQn);

/* Start Timer0 counting */
TIMER_Start(TIMER0);

/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function                                                                               */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P3 multi-function pins for UART0 RXD, TXD */
SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0;

GPIO_SetMode(P3,BIT6,GPIO_PMD_OUTPUT);

/* Set P1 multi-function pins for UART1 RXD and TXD */
SYS->P1_MFP &= ~(SYS_MFP_P12_Msk | SYS_MFP_P13_Msk);
SYS->P1_MFP |= (SYS_MFP_P12_RXD1 | SYS_MFP_P13_TXD1);

/* Set P0 multi-function pins for UART1 RTS */
SYS->P0_MFP = SYS->P0_MFP & (~SYS_MFP_P01_Msk) | SYS_MFP_P01_RTS1;

/*---------------------------------------------------------------------------------------------------------*/
/* Init UART                                                                                              */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset UART1 module */
SYS_ResetModule(UART1_RST);

/* Configure UART1 and set UART1 Baudrate */
UART_Open(UART1, 9600);

/* Set RS485-Master as AUD mode */
/* Enable AUD mode to HW control RTS pin automatically */
/* You also can use GPIO to control RTS pin for replacing AUD mode*/
UART_SelectRS485Mode(UART1, UART_ALT_CSR_RS485_AUD_Msk, 44);

/* Set RTS pin active level as high level active */
UART1->MCR &= ~UART_MCR_LEV_RTS_Msk;
UART1->MCR |= UART_RTS_IS_HIGH_LEV_ACTIVE;

/* Set UART parity as SPACE and ship baud rate setting */
UART_SetLine_Config(UART1, 0, UART_WORD_LEN_8, UART_PARITY_NONE, UART_STOP_BIT_1);

}

void module_uart1 (void)
{
unsigned char rxgroup[8] = {165,165,165,165,165,165,165,165};

if (gcv_time_flag2&(1<<bit_time_flag2_1s_2))
{
      gcv_time_flag2 &= ~(1<<bit_time_flag2_1s_2);

      /* Send data */
      UART_Write(UART1, rxgroup, 8);
}
}

作者: 匿名 时间: 2018-10-2 01:22

用逻辑分析仪观测TXD1,数据发送正常。

但是通过MAX1487，发送到PC上观测发现如上图数据。

请问我是哪里搞错了？

作者: jamesliu 时间: 2018-10-8 10:11
M051串口出来的数据正常，那就是MAX1487的问题了

作者: 匿名 时间: 2018-10-8 12:33

发现一个问题，如上图，在每个字节的停止位之前，多传了一个BIT的1
但我检查了初始化是：
UART_SetLine_Config(UART1, 0, UART_WORD_LEN_8, UART_PARITY_NONE, UART_STOP_BIT_1);

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