Part Number: MSP430F5438A
Other Parts Discussed in Thread: MSP430WARE
Hi,
I am trying to configure DMA0 to transfer data from the ADC to a buffer and DMA1 to transfer data from circularBuffer0 to UART. The adc is sampled based on a timer trigger.
When debugging the ADC samples correctly and I can send and receive information via UART however there is no DMA transfer from ADC result memory to the buffer and to the UART.
Am I initialising the DMA correctly?
Thank you,
Vlad
#include <msp430.h>
#include <stdint.h>
#define No_Buf_Samples 1376 // Definition of number of samples to be store in the buffer
volatile int circularBuffer0[No_Buf_Samples];
void DMA_Init()
{
DMACTL0 |= DMA0TSEL_24; // DMA0 trigger from ADC12IFGx
// TEST - Read in the test array
DMA0SZ = No_Buf_Samples; // Block size
DMACTL4 = DMARMWDIS; // Read-modify-write disable
DMA0CTL &= ~DMAIFG; // Clear DMA interrupt flag
// DMA0CTL |= DMADT_4 + DMASRCINCR_0 + DMADSTINCR_3 + DMASBDB + DMAIE ;//Repeat single transfer, Source address constant, Destination address incremented,
//DMA1 to UART
DMACTL0 |= DMA1TSEL_30; // DMA1 Trigger from DMA0IFG
DMA1CTL |= DMADT_6 + DMASRCINCR_3+ DMADSTINCR_0 + DMASBDB + DMALEVEL; //Burst block transfer, Increment source address, Destination address unchanged , enable , level sensitive
}
void DMA_ADC_Transfer()
{
__data16_write_addr((unsigned short) &DMA0SA,(unsigned long) &ADC12MEM0);
__data16_write_addr((unsigned short) &DMA0DA,(unsigned long) &circularBuffer0);
DMA0CTL |= DMAEN; // Enable DMA0
DMA0CTL |= DMAREQ; // Trigger block transfer
}
// DMA Uart Transfer Function
void DMA_UART_Transfer()
{
DMA1SZ = sizeof (circularBuffer0); // Block size
__data16_write_addr((unsigned short) &DMA1SA,(unsigned long) &circularBuffer0);
__data16_write_addr((unsigned short) &DMA1DA,(unsigned long) &UCA1TXBUF);
DMA1CTL |= DMAEN; // // Enable DMA1
DMA1CTL |= DMAREQ; // Trigger block transfer
}
void Timer_B_Init(void)
{
//TB0CCTL0 = CCIE; // CCR0 interrupt enabled
TB0CCR0 = 80; // Init TBCCR0 w/ sample period
TB0CCR1 = 40; // Trigger for ADC12 Sample Conversion
TB0CCTL1 = OUTMOD_4; // Trigger ADC Conversion Mode OutMOD Set/Reset
TB0CTL |= TASSEL_2 + MC_1 + TACLR ; // SMCLK, up mode
}
void UART_Init(void)
{
P5SEL |= 0xC0; // P5.6,7 = USCI_A1 TXD/RXD
UCA1CTL1 |= UCSWRST; // **Put state machine in reset**
UCA1CTL1 |= UCSSEL_2; // SMCLK
// 16MHz Baud 115200
UCA1BR0 = 0x45; // Clock 16MHz, Baud 115200
UCA1BR1 = 0x00; // Clock 16MHz, Baud 115200
UCA1MCTL |= UCBRS_4 + UCBRF_0; // Modulation UCBRSx=4, UCBRFx=0, UCOS16 =0
UCA1CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
UCA1IE |= UCRXIE; // Enable USCI_A1 RX interrupt
}
void ADC_Init(int ADC_Sampling_Channel,int ADC_Sampling_Mode)
{
P6SEL |= (1<<BIT7); // Enable selected A/D Channel Peripheral Function
P6DIR &= ~BIT7; // ADC Input Direction
ADC12CTL0 &= (~(1<<ADC12ENC)); // Allows setting of ADC registers
ADC12CTL0 |= ADC12SHT0_0 + ADC12ON;// Turn On ADC12,4 clk cycles sampling, ADC Reference Set at +AVcc and -AVss
ADC12CTL1 |= ADC12SHS_3 + ADC12SHP + ADC12SSEL_0;// Sample-and-hold pulse mode, TB0.1 Sample Source, ADC12OSC Source
ADC12CTL2 |=ADC12RES_2 + ADC12TCOFF; // ADC 12 bit res, Temperature sensor off
ADC12MCTL0 = ADC12INCH_7 + ADC12EOS; // map CH 7 to MEM0, End of Sampling
void ADC_Init(int ADC_Sampling_Channel,int ADC_Sampling_Mode)
{
P6SEL |= (1<<BIT7); // Enable selected A/D Channel Peripheral Function
P6DIR &= ~BIT7; // ADC Input Direction
ADC12CTL0 &= (~(1<<ADC12ENC)); // Allows setting of ADC registers
ADC12CTL0 |= ADC12SHT0_0 + ADC12ON;// Turn On ADC12,4 clk cycles sampling, ADC Reference Set at +AVcc and -AVss
ADC12CTL1 |= ADC12SHS_3 + ADC12SHP + ADC12SSEL_0;// Sample-and-hold pulse mode, TB0.1 Sample Source, ADC12OSC Source
ADC12CTL2 |=ADC12RES_2 + ADC12TCOFF; // ADC 12 bit res, Temperature sensor off
ADC12MCTL0 = ADC12INCH_7 + ADC12EOS; // map CH 7 to MEM0, End of Sampling
ADC12CTL1 |= ADC12CONSEQ_0;
ADC12IE = ADC12IE0; // Enable interrupt
}
void ADC_Start(void)
{
ADC12CTL0 |= ADC12ENC + ADC12SC; // Enable Conversion
}
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // stop watchdog timer
//Initialise The DMA Functionality
DMA_Init();
//Initialise the UART A1
UART_Init();
//Initialise the Timer A0 - used for power saving and TB0.1 - ADC tirgger
Timer_B_Init();
ADC_Init(7,SingleChannel_SingleMeasurement); // Initialise ADC Function
ADC_Start();
DMA_ADC_Transfer();
DMA_UART_Transfer();
__bis_SR_register(GIE); //interrupts enabled
while(1)
{
// do nothing
}
}
