To create a C++ program for an MSP430 microprocessor that reads an ADC and sleeps for the number of milliseconds read, you will need to use MSP430's built-in ADC and timer modules. Here's an example code that you can modify to meet your needs:
Code:
#include <msp430.h>
void initADC()
{
ADC10CTL1 = INCH_5 + ADC10DIV_7; // Input Channel 5, ADC10CLK/8
ADC10CTL0 = SREF_0 + ADC10SHT_3 + ADC10ON + ADC10IE; // Vcc/Vss ref, 64 clock cycles, ADC on, interrupt enabled
ADC10AE0 |= BIT5; // Enable Analog Input A5
}
void initTimer()
{
TA0CCTL0 = CCIE; // Capture/compare interrupt enabled
TA0CCR0 = 0xFFFF; // Set timer period to maximum
TA0CTL = TASSEL_2 + MC_2; // SMCLK, continuous mode
}
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A(void)
{
// Sleep for the ADC reading in milliseconds
__delay_cycles(1000 * ADC10MEM * (F_CPU / 8000000)); // F_CPU is the MSP430's clock frequency
}
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
initADC(); // Initialize ADC
initTimer(); // Initialize Timer
__bis_SR_register(GIE); // Enable global interrupts
while (1)
{
ADC10CTL0 |= ENC + ADC10SC; // Start conversion
__bis_SR_register(CPUOFF + GIE); // Enter LPM0, enable interrupts
ADC10CTL0 &= ~ENC; // Disable conversion
}
return 0;
}
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
__bic_SR_register_on_exit(CPUOFF); // Exit LPM0
}
In this program, the initADC() function initializes the MSP430's ADC module to use input channel 5 and a clock divider of 8, with Vcc/Vss reference and 64 clock cycles. The initTimer() function initializes the MSP430's Timer module to use SMCLK (the MSP430's clock source) and continuous mode, with a period set to the maximum value. The Timer_A() interrupt service routine is triggered when the Timer module's capture/compare register matches the timer value, and it sleeps for the ADC reading in milliseconds using the __delay_cycles() function. The main function initializes the ADC and Timer modules, enables interrupts, and enters an infinite loop that starts an ADC conversion and enters low-power mode 0 (LPM0) with interrupts enabled, waiting for the ADC conversion to complete. The ADC10_ISR() interrupt service routine is triggered when the ADC conversion is complete, and it exits LPM0. You can modify the program to suit your specific requirements, such as changing the ADC input channel and clock divider, adjusting the timer period, and adding code to handle the ADC conversion results.