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MSP432E401Y: 串口通信怎么得到读取的数据，我使用的是数据回显的例程，例程如下

2021-07-29 分类：其他MCU处理器 阅读(130)

Part Number:MSP432E401Y

#include <stdint.h>
#include <stdbool.h>
#include "driverlib.h"
#include "uartstdio.h"

#ifdef DEBUG
void
__error__(char *pcFilename, uint32_t ui32Line)
{
}
#endif


int g_ui32SysClock;
unsigned char a;
void
UART6_IRQHandler(void)
{uint32_t ui32Status;

//
// Get the interrrupt status.
//ui32Status = MAP_UARTIntStatus(UART6_BASE, true);

//
// Clear the asserted interrupts.
//MAP_UARTIntClear(UART6_BASE, ui32Status);

//
// Loop while there are characters in the receive FIFO.
//while(MAP_UARTCharsAvail(UART6_BASE))
	{
//
// Read the next character from the UART and write it back to the UART.
//MAP_UARTCharPutNonBlocking(UART6_BASE,MAP_UARTCharGetNonBlocking(UART6_BASE));

//
// Blink the LED to show a character transfer is occuring.
//GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_0, GPIO_PIN_0);

//
// Delay for 1 millisecond. Each SysCtlDelay is about 3 clocks.
//SysCtlDelay(g_ui32SysClock / (1000 * 3));

//
// Turn off the LED
//GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_0, 0);
	}
}

void
UARTSend(const uint8_t *pui8Buffer, uint32_t ui32Count)
{
//
// Loop while there are more characters to send.
//
while(ui32Count--)
{
//
// Write the next character to the UART.
//
MAP_UARTCharPutNonBlocking(UART6_BASE, *pui8Buffer++);
}
}

void InitConsole(void)
{/* Enable the clock to GPIO port A and UART 0 */MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);/* Configure the GPIO Port A for UART 0 */MAP_GPIOPinConfigure(GPIO_PA0_U0RX);MAP_GPIOPinConfigure(GPIO_PA1_U0TX);MAP_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);/* Configure the UART for 115200 bps 8-N-1 format with internal 16 MHz* oscillator as the UART clock source */MAP_UARTClockSourceSet(UART0_BASE, UART_CLOCK_ALTCLK);UARTStdioConfig(0, 115200, 16000000);
}

int
main(void)
{
//
// Set the clocking to run directly from the crystal at 120MHz.
//
g_ui32SysClock = MAP_SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
SYSCTL_OSC_MAIN |
SYSCTL_USE_PLL |
SYSCTL_CFG_VCO_480), 120000000);
	
	
	InitConsole();
	
//
// Enable the GPIO port that is used for the on-board LED.
//
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPION);

//
// Enable the GPIO pins for the LED (PN0).
//
MAP_GPIOPinTypeGPIOOutput(GPIO_PORTN_BASE, GPIO_PIN_0);

//
// Enable the peripherals used by this example.
//
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART6);
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOP);

//
// Enable processor interrupts.
//
MAP_IntMasterEnable();

//
// Set GPIO A0 and A1 as UART pins.
//
GPIOPinConfigure(GPIO_PP0_U6RX);
GPIOPinConfigure(GPIO_PP1_U6TX);
MAP_GPIOPinTypeUART(GPIO_PORTP_BASE, GPIO_PIN_0 | GPIO_PIN_1);

//
// Configure the UART for 115,200, 8-N-1 operation.
//
MAP_UARTConfigSetExpClk(UART6_BASE, g_ui32SysClock, 115200,(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |UART_CONFIG_PAR_NONE));

//
// Enable the UART interrupt.
//
MAP_IntEnable(INT_UART6);
MAP_UARTIntEnable(UART6_BASE, UART_INT_RX | UART_INT_RT);

//
// Prompt for text to be entered.
//


//
// Loop forever echoing data through the UART.
//
while(1)
{
//	a=UARTFR;
	UARTprintf("%d \n",1);
}
}

Susan Yang：

“串口通信怎么得到读取的数据”

您是想获取串口读取的数据？

Sending and receiving data via the UART is handled by the UARTCharGet(), UARTCharGetNonBlocking(), UARTCharPut(), UARTCharPutNonBlocking(), UARTBreakCtl(), UARTCharsAvail(), and UARTSpaceAvail() functions. 

在此例程中使用的是 

UARTCharGetNonBlocking() 

http://software-dl.ti.com/simplelink/esd/simplelink_msp432e4_sdk/4.10.00.13/docs/driverlib/msp432e4/api_guide/html/group__uart__api.html#gaad338221fc820412b005653855cedaf7 

,

Zhengyuan Fang Fang：

我可以读到数了，我现在是使用a=UARTCharGetNonBlocking(UART6_BASE);这个函数，但是打印出来的a一直是255，无论我发送的是什么都是这个数，这是怎么回事呢，求教

,

Susan Yang：

请问代码是怎样的？a是如何定义的呢？

,

Zhengyuan Fang Fang：

#include <stdint.h>
#include <stdbool.h>
#include "driverlib.h"
#include "uartstdio.h"#ifdef DEBUG
void
__error__(char *pcFilename, uint32_t ui32Line)
{
}
#endifint g_ui32SysClock;
unsigned char a;
void
UART6_IRQHandler(void)
{uint32_t ui32Status;//
// Get the interrrupt status.
//ui32Status = MAP_UARTIntStatus(UART6_BASE, true);//
// Clear the asserted interrupts.
//MAP_UARTIntClear(UART6_BASE, ui32Status);//
// Loop while there are characters in the receive FIFO.
//while(MAP_UARTCharsAvail(UART6_BASE)){
//
// Read the next character from the UART and write it back to the UART.
//MAP_UARTCharPutNonBlocking(UART6_BASE,MAP_UARTCharGetNonBlocking(UART6_BASE));//
// Blink the LED to show a character transfer is occuring.
//GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_0, GPIO_PIN_0);//
// Delay for 1 millisecond. Each SysCtlDelay is about 3 clocks.
//SysCtlDelay(g_ui32SysClock / (1000 * 3));//
// Turn off the LED
//GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_0, 0);}
}void
UARTSend(const uint8_t *pui8Buffer, uint32_t ui32Count)
{
//
// Loop while there are more characters to send.
//
while(ui32Count--)
{
//
// Write the next character to the UART.
//
MAP_UARTCharPutNonBlocking(UART6_BASE, *pui8Buffer++);
}
}void InitConsole(void)
{/* Enable the clock to GPIO port A and UART 0 */MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);/* Configure the GPIO Port A for UART 0 */MAP_GPIOPinConfigure(GPIO_PA0_U0RX);MAP_GPIOPinConfigure(GPIO_PA1_U0TX);MAP_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);/* Configure the UART for 115200 bps 8-N-1 format with internal 16 MHz* oscillator as the UART clock source */MAP_UARTClockSourceSet(UART0_BASE, UART_CLOCK_ALTCLK);UARTStdioConfig(0, 115200, 16000000);
}int
main(void)
{
//
// Set the clocking to run directly from the crystal at 120MHz.
//
g_ui32SysClock = MAP_SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
SYSCTL_OSC_MAIN |
SYSCTL_USE_PLL |
SYSCTL_CFG_VCO_480), 120000000);InitConsole();//
// Enable the GPIO port that is used for the on-board LED.
//
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPION);//
// Enable the GPIO pins for the LED (PN0).
//
MAP_GPIOPinTypeGPIOOutput(GPIO_PORTN_BASE, GPIO_PIN_0);//
// Enable the peripherals used by this example.
//
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART6);
MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOP);//
// Enable processor interrupts.
//
MAP_IntMasterEnable();//
// Set GPIO A0 and A1 as UART pins.
//
GPIOPinConfigure(GPIO_PP0_U6RX);
GPIOPinConfigure(GPIO_PP1_U6TX);
MAP_GPIOPinTypeUART(GPIO_PORTP_BASE, GPIO_PIN_0 | GPIO_PIN_1);//
// Configure the UART for 115,200, 8-N-1 operation.
//
MAP_UARTConfigSetExpClk(UART6_BASE, g_ui32SysClock, 115200,(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |UART_CONFIG_PAR_NONE));//
// Enable the UART interrupt.
//
MAP_IntEnable(INT_UART6);
MAP_UARTIntEnable(UART6_BASE, UART_INT_RX | UART_INT_RT);//
// Prompt for text to be entered.
//
while(!UARTCharsAvail(UART6_BASE))
{
}while(1)
{
//	a=UARTFR;a=UARTCharGetNonBlocking(UART6_BASE);UARTprintf("%d \n",a);
}
}

代码是这样的，a我定义的是unsigned char

,

Susan Yang：

Zhengyuan Fang Fang 说：a我定义的是unsigned char

您需要使用数组的方式，如 

char rxMsgData[NUM_RX_CHARS]

,

Zhengyuan Fang Fang：

您好，我试了下还是不太会，能否发一个例程研究一下

,

Susan Yang：

因为没有MSP432E系列的板子，我是用的MSP432P401的开发板测试的

C:\ti\simplelink_msp432p4_sdk_3_40_01_02\examples\nortos\MSP_EXP432P401R\driverlib\uart_pc_echo_12mhz_brclk

可以在var内读到键盘输入的字符

代码如下

/* EUSCI A0 UART ISR - Echoes data back to PC host */
void EUSCIA0_IRQHandler(void)
{uint32_t status = MAP_UART_getEnabledInterruptStatus(EUSCI_A0_BASE);uint8_t val=0;if(status & EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG){// MAP_UART_transmitData(EUSCI_A0_BASE, MAP_UART_receiveData(EUSCI_A0_BASE));val = UART_receiveData(EUSCI_A0_BASE);}}

,

Susan Yang：

关于该函数，您可以看一下

25.3.2.12 uint8_t UART_receiveData ( uint32_t moduleInstance )

https://software-dl.ti.com/msp430/msp430_public_sw/mcu/msp430/MSP432_Driver_Library/latest/exports/driverlib/msp432_driverlib_3_21_00_05/doc/MSP432P4xx/MSP432_DriverLib_Users_Guide-MSP432P4xx-3_21_00_05.pdf 

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