Part Number: MSP432P4111
Hi,
I try to communicate over UART_A2 with a modem on pins 3.2 and 3.3.
My target is that it runs on a FreeRTOS applicatoin with a system clock of 48MHz. But now for testing I have reduced it to a simple programm (which I found on several places).
/*
* Communication with Modem Mikroelektronika LTE IO CLICK
*
**********************************************************************************************/
#include <stdint.h>
#include <stdio.h>
#include <stdbool.h>
#include <ti/drivers/GPIO.h>
#include <ti/drivers/gpio/GPIOMSP432.h>
#include <ti/devices/msp432p4xx/driverlib/driverlib.h>
#include <string.h>
#define UART2 GPIO_PORT_P3, GPIO_PIN2 | GPIO_PIN3
#define MODEMSTART GPIO_PORT_P4, GPIO_PIN6
const eUSCI_UART_Config 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, // MSB First
EUSCI_A_UART_ONE_STOP_BIT, // One stop bit
EUSCI_A_UART_MODE, // UART mode
EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION // Oversampling
};
void EUSCIA2_IRQHandler(void)
{
uint32_t status = MAP_UART_getEnabledInterruptStatus(EUSCI_A2_BASE);
// char receiveByte = EUSCI_A2->RXBUF; //UCA2RXBUF; //This is the address where the received byte is stored
char receiveByte = MAP_UART_receiveData(EUSCI_A2_BASE);
MAP_UART_clearInterruptFlag(EUSCI_A2_BASE, status);
if(status & EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG)
{
MAP_UART_transmitData(EUSCI_A2_BASE, receiveByte);
printf("\nEUSCIA2_IRQHandler: %c", receiveByte);
}
}
int main(void)
{
/* Halting WDT */
WDT_A_holdTimer();
printf("\nCS_getDCOFrequency=%d", CS_getDCOFrequency());
printf("\nCS_getMCLK=%d", CS_getMCLK());
printf("\nCS_getSMCLK=%d\n", CS_getSMCLK());
/* Set pins 2 and 3 of port 3 to the primary module function (UART) */
GPIO_setAsPeripheralModuleFunctionInputPin(UART2, GPIO_PRIMARY_MODULE_FUNCTION);
/* Setting DCO to 12MHz */
CS_setDCOCenteredFrequency(CS_DCO_FREQUENCY_12);
UART_initModule(EUSCI_A2_BASE, &uartConfig);
UART_enableModule(EUSCI_A2_BASE);
/* Enabling UART interrupts */
MAP_UART_enableInterrupt(EUSCI_A2_BASE, EUSCI_A_UART_RECEIVE_INTERRUPT);
MAP_Interrupt_enableInterrupt(INT_EUSCIA2);
MAP_Interrupt_enableSleepOnIsrExit();
MAP_Interrupt_enableMaster();
MAP_GPIO_setAsOutputPin(MODEMSTART);
/* reset Modem */
MAP_GPIO_setOutputHighOnPin(MODEMSTART);
for (int var = 0; var < 2400000; ++var) { } // 50ms
MAP_GPIO_setOutputLowOnPin(MODEMSTART);
for (int var = 0; var < 2400000; ++var) { } // 50ms
for (int var = 0; var < 2400000; ++var) { } // 50ms
for (int var = 0; var < 2400000; ++var) { } // 50ms
for (int var = 0; var < 2400000; ++var) { } // 50ms
MAP_GPIO_setOutputHighOnPin(MODEMSTART);
for (int var = 0; var < 2400000; ++var) { }
// UART_transmitData(EUSCI_A2_BASE, "AT");
MAP_UART_transmitData(EUSCI_A2_BASE, 'A');
MAP_UART_transmitData(EUSCI_A2_BASE, 'T');
while (1)
{
MAP_PCM_gotoLPM0();
}
}
The current issue is that the ISR is entered continuously and put out:
EUSCIA2_IRQHandler: A
EUSCIA2_IRQHandler: A
EUSCIA2_IRQHandler: A
...
1. It looks like the ISR Flag isn't resetted...?
2. Is it possible to transmit a char[] e.g. transmit 'AT' instead of 'A' and then 'T' ?
3. What are the settings for BRDIV, UCxBRF and UCxBRS if SMCLK has 48MHz? From the Technical Reference Manual I found this table but I can't find a setup for 48MHz.
Thanks for help
