TI中文支持网Part Number: MSP432P401R
您好！我是初学者，想了解UART怎么传输从PC输入的命令（字符串）。实际上，就是目前我写了一段代码，MOVE_X(float Dx）表示x方向移动Dx mm，放在mian()里面是可以运行的。但是，现在我需要的是mian()里面，不添加这条命令，想通过UART串口来实现命令的传输。软件是Code Composer Stuido, 硬件是MSP432。接下来是两段代码。代码一为实例代码，代码二为本人编写的，用来尝试从PC发送命令。但是自己写的代码不能到达这个目的，希望得到大家的指导，谢谢！
代码一（示例）：
* MSP432P401
* —————–
* | |
* | |
* | |
* RST -| P1.3/UCA0TXD|—-> PC (echo)
* | |
* | |
* | P1.2/UCA0RXD|<—- PC
* | |
*
*******************************************************************************/
/* DriverLib Includes */
#include <ti/devices/msp432p4xx/driverlib/driverlib.h>
/* Standard Includes */
#include <stdint.h>
#include <stdbool.h>
//![Simple UART Config]
/* UART Configuration Parameter. These are the configuration parameters to
* make the eUSCI A UART module to operate with a 9600 baud rate. These
* values were calculated using the online calculator that TI provides
* at:
*software-dl.ti.com/…/index.html
*/
const eUSCI_UART_ConfigV1 uartConfig =
{
EUSCI_A_UART_CLOCKSOURCE_SMCLK, // SMCLK Clock Source
78, // BRDIV = 78
2, // UCxBRF = 2
0, // UCxBRS = 0
EUSCI_A_UART_NO_PARITY, // No Parity
EUSCI_A_UART_LSB_FIRST, // LSB First
EUSCI_A_UART_ONE_STOP_BIT, // One stop bit
EUSCI_A_UART_MODE, // UART mode
EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION, // Oversampling
EUSCI_A_UART_8_BIT_LEN // 8 bit data length
};
//![Simple UART Config]
int main(void)
{
/* Halting WDT */
MAP_WDT_A_holdTimer();
/* Selecting P1.2 and P1.3 in UART mode */
MAP_GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1,
GPIO_PIN2 | GPIO_PIN3, GPIO_PRIMARY_MODULE_FUNCTION);
/* Setting DCO to 12MHz */
CS_setDCOCenteredFrequency(CS_DCO_FREQUENCY_12);
//![Simple UART Example]
/* Configuring UART Module */
MAP_UART_initModule(EUSCI_A0_BASE, &uartConfig);
/* Enable UART module */
MAP_UART_enableModule(EUSCI_A0_BASE);
/* Enabling interrupts */
MAP_UART_enableInterrupt(EUSCI_A0_BASE, EUSCI_A_UART_RECEIVE_INTERRUPT);
MAP_Interrupt_enableInterrupt(INT_EUSCIA0);
MAP_Interrupt_enableSleepOnIsrExit();
MAP_Interrupt_enableMaster();
//![Simple UART Example]
while(1)
{
MAP_PCM_gotoLPM0();
}
}
/* EUSCI A0 UART ISR – Echoes data back to PC host */
void EUSCIA0_IRQHandler(void)
{
uint32_t status = MAP_UART_getEnabledInterruptStatus(EUSCI_A0_BASE);
if(status & EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG)
{
MAP_UART_transmitData(EUSCI_A0_BASE, MAP_UART_receiveData(EUSCI_A0_BASE));
}
}
代码二：
*
* MSP432P401
* —————–
* | |
* | |
* | |
* RST -| P1.3/UCA0TXD|—-> PC (echo)
* | |
* | |
* | P1.2/UCA0RXD|<—- PC
* | |
*
*******************************************************************************/
/* DriverLib Includes */
#include <ti/devices/msp432p4xx/driverlib/driverlib.h>
/* Standard Includes */
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <stdio.h>
//![Simple UART Config]
/* UART Configuration Parameter. These are the configuration parameters to
* make the eUSCI A UART module to operate with a 9600 baud rate. These
* values were calculated using the online calculator that TI provides
* at:
*software-dl.ti.com/…/index.html
*/
uint64_t i,j,Nx,Ny,Nz,N;
float Dx,Dy,Dz,theta,x1,x2,y1,y2,R;
void MOVE_X(float Dx);
const eUSCI_UART_ConfigV1 uartConfig =
{
EUSCI_A_UART_CLOCKSOURCE_SMCLK, // SMCLK Clock Source
78, // BRDIV = 78
2, // UCxBRF = 2
0, // UCxBRS = 0
EUSCI_A_UART_NO_PARITY, // No Parity
EUSCI_A_UART_LSB_FIRST, // LSB First
EUSCI_A_UART_ONE_STOP_BIT, // One stop bit
EUSCI_A_UART_MODE, // UART mode
EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION, // Oversampling
EUSCI_A_UART_8_BIT_LEN // 8 bit data length
};
//![Simple UART Config]
unsigned char* cmd ;
int main(void)
{
/* Halting WDT */
MAP_WDT_A_holdTimer();
/* Selecting P1.2 and P1.3 in UART mode */
MAP_GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1,
GPIO_PIN2 | GPIO_PIN3, GPIO_PRIMARY_MODULE_FUNCTION);
/* Setting DCO to 12MHz */
CS_setDCOCenteredFrequency(CS_DCO_FREQUENCY_12);
//![Simple UART Example]
/* Configuring UART Module */
MAP_UART_initModule(EUSCI_A0_BASE, &uartConfig);
/* Enable UART module */
MAP_UART_enableModule(EUSCI_A0_BASE);
/* Enabling interrupts */
MAP_UART_enableInterrupt(EUSCI_A0_BASE, EUSCI_A_UART_RECEIVE_INTERRUPT);
MAP_Interrupt_enableInterrupt(INT_EUSCIA0);
Interrupt_disableSleepOnIsrExit();
MAP_Interrupt_enableSleepOnIsrExit();
MAP_Interrupt_enableMaster();
//![Simple UART Example]
while(1)
{
MAP_PCM_gotoLPM0();
if (cmd == 'MX10')
{
MOVE_X(10);
}
}
}
/* EUSCI A0 UART ISR – Echoes data back to PC host */
void EUSCIA0_IRQHandler(void)
{
uint32_t status = MAP_UART_getEnabledInterruptStatus(EUSCI_A0_BASE);
if(status & EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG)
{
cmd = MAP_UART_receiveData(EUSCI_A0_BASE);
MAP_UART_transmitData(EUSCI_A0_BASE, MAP_UART_receiveData(EUSCI_A0_BASE));
}
}
void MOVE_X(float Dx)
{
if (Dx >= 0)
P4->OUT |= BIT5;
else
{
P4->OUT &= ~BIT5;
Dx = -Dx;
}
Nx = 800*Dx; //en mode complet (1/16 step)
for (i=0; i<=Nx;i++)
{
P4->OUT ^= BIT4;
__delay_cycles(375);
P4->OUT ^= BIT4;
__delay_cycles(375);
}
}
Susan Yang：
SHENG Gaopeng 说：想了解UART怎么传输从PC输入的命令（字符串）
不知是否理解了您的需求。您可以尝试以下操作：
1 PC端使用串口调试助手来发送命令
2 使用MSP432的串口来接收串口字符
3 MSP432接收到字符后，进入串口中断
4 MSP432串口中断内写入您需要进行的操作
,
SHENG Gaopeng：
具体点是这样的。比如说，我想让机器x方向移动10mm，然后我也定义了这个子程序MOVE_X(float Dx）。现在就是，怎么通过UART串口输入命令，比如我在串口中输入MX10，MSP432能识别这个命令，执行MOVE_X(10),让机器x方向移动10mm。
那么具体的问题就是，如何通过MAP_UART_receiveData(EUSCI_A0_BASE)这个接受的数据，来实现上述功能。
,
Susan Yang：
您可以参考一下
simplelink_msp432p4_sdk\examples\nortos\MSP_EXP432P401R\driverlib\uart_loopback_24mhz_brclk
查看代码：
1 使用
MAP_UART_enableInterrupt(EUSCI_A2_BASE, EUSCI_A_UART_RECEIVE_INTERRUPT);
来使能接收中断
2 在中断服务程序内
if(status & EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG)
当获取到接收中断（即 EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG）时，会执行
{ RXData = MAP_UART_receiveData(EUSCI_A2_BASE); //在此获取接收数据，如MX10
if(RXData != TXData) // Check value 这部分您可以修改为您自己需要处理的任务，如执行MOVE_X(10),让机器x方向移动10mm { MAP_GPIO_setOutputHighOnPin(GPIO_PORT_P1, GPIO_PIN0); while(1); // Trap CPU } TXData++; MAP_Interrupt_disableSleepOnIsrExit(); }
