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Wismote : Direct memory access using UART.

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This commit is contained in:
suman_panchal 2015-10-29 00:09:34 +05:30
parent 6ac939bc58
commit 8d139222f6
2 changed files with 57 additions and 8 deletions
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56
cpu/msp430/f5xxx/uart1.c
View file

@ -44,6 +44,36 @@ static int (*uart1_input_handler)(unsigned char c);
static volatile uint8_t transmitting;
#ifdef UART1_CONF_RX_WITH_DMA
#define RX_WITH_DMA UART1_CONF_RX_WITH_DMA
#else /* UART1_CONF_RX_WITH_DMA */
#define RX_WITH_DMA 1
#endif /* UART1_CONF_RX_WITH_DMA */
#if RX_WITH_DMA
#define RXBUFSIZE 128
static uint8_t rxbuf[RXBUFSIZE];
static uint16_t last_size;
static struct ctimer rxdma_timer;
static void
handle_rxdma_timer(void *ptr)
{
uint16_t size;
size = DMA0SZ; /* Note: loop requires that size is less or eq to RXBUFSIZE */
while(last_size != size) {
uart1_input_handler((unsigned char)rxbuf[RXBUFSIZE - last_size]);
last_size--;
if(last_size == 0) {
last_size = RXBUFSIZE;
}
}
ctimer_reset(&rxdma_timer);
}
#endif /* RX_WITH_DMA */
/*---------------------------------------------------------------------------*/
uint8_t
uart1_active(void)
@ -54,6 +84,9 @@ uart1_active(void)
void
uart1_set_input(int (*input)(unsigned char c))
{
#if RX_WITH_DMA /* This needs to be called after ctimer process is started */
ctimer_set(&rxdma_timer, CLOCK_SECOND / 64, handle_rxdma_timer, NULL);
#endif
uart1_input_handler = input;
}
/*---------------------------------------------------------------------------*/
@ -86,8 +119,8 @@ uart1_init(unsigned long ubr)
UCA1MCTL = UCBRS_3; /* Modulation UCBRSx = 3 */
P4DIR |= BIT5;
P4OUT |= BIT5 ;
P5SEL |= BIT6|BIT7; // P5.6,7 = USCI_A1 TXD/RXD
P4OUT |= BIT5;
P5SEL |= BIT6 | BIT7; /* P5.6,7 = USCI_A1 TXD/RXD */
P4SEL |= BIT7;
P4DIR |= BIT7;
@ -102,14 +135,30 @@ uart1_init(unsigned long ubr)
UCA1CTL1 &= ~UCSWRST; /* Initialize USCI state machine **before** enabling interrupts */
UCA1IE |= UCRXIE; /* Enable UCA1 RX interrupt */
#if RX_WITH_DMA
UCA1IE &= ~UCRXIE; /* disable USART1 RX interrupt */
/* UART1_RX trigger */
DMACTL0 = DMA0TSEL_20;
/* source address = RXBUF1 */
DMA0SA = (unsigned int)&UCA1RXBUF;
DMA0DA = (unsigned int)&rxbuf;
DMA0SZ = RXBUFSIZE;
last_size = RXBUFSIZE;
DMA0CTL = DMADT_4 + DMASBDB + DMADSTINCR_3 + DMAEN + DMAREQ;
msp430_add_lpm_req(MSP430_REQUIRE_LPM1);
#endif /* RX_WITH_DMA */
}
/*---------------------------------------------------------------------------*/
#if !RX_WITH_DMA
ISR(USCI_A1, uart1_rx_interrupt)
{
uint8_t c;
ENERGEST_ON(ENERGEST_TYPE_IRQ);
if (UCA1IV == 2) {
if(UCA1IV == 2) {
if(UCA1STAT & UCRXERR) {
c = UCA1RXBUF; /* Clear error flags by forcing a dummy read. */
} else {
@ -123,4 +172,5 @@ ISR(USCI_A1, uart1_rx_interrupt)
}
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
#endif /* !RX_WITH_DMA */
/*---------------------------------------------------------------------------*/

5
platform/wismote/contiki-conf.h
View file

@ -109,7 +109,6 @@
#define ELFLOADER_CONF_TEXTMEMORY_SIZE 0x800
#endif /* ELFLOADER_CONF_TEXTMEMORY_SIZE */
#define AODV_COMPLIANCE
#define AODV_NUM_RT_ENTRIES 32
@ -119,6 +118,8 @@
#define PROCESS_CONF_STATS 1
/*#define PROCESS_CONF_FASTPOLL 4*/
#define UART1_CONF_RX_WITH_DMA 0
#ifdef NETSTACK_CONF_WITH_IPV6
#define LINKADDR_CONF_SIZE 8
@ -189,8 +190,6 @@
#define UIP_CONF_TCP_SPLIT 0
/* include the project config */
/* PROJECT_CONF_H might be defined in the project Makefile */
#ifdef PROJECT_CONF_H