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Zolertia Z1: Direct memory access using UART.

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This commit is contained in:
suman_panchal 2015-10-28 20:56:47 +05:30
parent 6ac939bc58
commit 35cc40563e
3 changed files with 95 additions and 24 deletions
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47
cpu/msp430/f2xxx/msp430.c
View File

@ -32,8 +32,12 @@
#include "contiki.h"
#include "dev/watchdog.h"
/* dco_required set to 1 will cause the CPU not to go into
* sleep modes where the DCO clock stopped */
int msp430_dco_required;
#if defined(__MSP430__) && defined(__GNUC__)
#define asmv(arg) __asm__ __volatile__(arg)
#define asmv(arg) __asm__ __volatile__ (arg)
#endif
/*---------------------------------------------------------------------------*/
@ -42,8 +46,8 @@ void *
w_memcpy(void *out, const void *in, size_t n)
{
uint8_t *src, *dest;
src = (uint8_t *) in;
dest = (uint8_t *) out;
src = (uint8_t *)in;
dest = (uint8_t *)out;
while(n-- > 0) {
*dest++ = *src++;
}
@ -56,7 +60,7 @@ void *
w_memset(void *out, int value, size_t n)
{
uint8_t *dest;
dest = (uint8_t *) out;
dest = (uint8_t *)out;
while(n-- > 0) {
*dest++ = value & 0xff;
}
@ -152,10 +156,30 @@ init_ports(void)
/*---------------------------------------------------------------------------*/
/* msp430-ld may align _end incorrectly. Workaround in cpu_init. */
#if defined(__MSP430__) && defined(__GNUC__)
extern int _end; /* Not in sys/unistd.h */
extern int _end; /* Not in sys/unistd.h */
static char *cur_break = (char *)&_end;
#endif
/*---------------------------------------------------------------------------*/
/* add/remove_lpm_req - for requiring a specific LPM mode. currently Contiki */
/* jumps to LPM3 to save power, but DMA will not work if DCO is not clocked */
/* so some modules might need to enter their LPM requirements */
/* NOTE: currently only works with LPM1 (e.g. DCO) requirements. */
/*---------------------------------------------------------------------------*/
void
msp430_add_lpm_req(int req)
{
if(req <= MSP430_REQUIRE_LPM1) {
msp430_dco_required++;
}
}
void
msp430_remove_lpm_req(int req)
{
if(req <= MSP430_REQUIRE_LPM1) {
msp430_dco_required--;
}
}
void
msp430_cpu_init(void)
{
@ -164,7 +188,7 @@ msp430_cpu_init(void)
init_ports();
/* set DCO to a reasonable default value (8MHz) */
msp430_init_dco();
/* calibrate the DCO step-by-step */
/* calibrate the DCO step-by-step */
msp430_sync_dco();
eint();
#if defined(__MSP430__) && defined(__GNUC__)
@ -172,6 +196,7 @@ msp430_cpu_init(void)
cur_break++;
}
#endif
msp430_dco_required = 0;
}
/*---------------------------------------------------------------------------*/
@ -191,7 +216,7 @@ splhigh_(void)
asmv("mov r2, %0" : "=r" (sr));
asmv("bic %0, r2" : : "i" (GIE));
#endif
return sr & GIE; /* Ignore other sr bits. */
return sr & GIE; /* Ignore other sr bits. */
}
/*---------------------------------------------------------------------------*/
/*
@ -209,7 +234,8 @@ splhigh_(void)
/* } */
/*---------------------------------------------------------------------------*/
#ifdef __IAR_SYSTEMS_ICC__
int __low_level_init(void)
int
__low_level_init(void)
{
/* turn off watchdog so that C-init will run */
WDTCTL = WDTPW + WDTHOLD;
@ -224,7 +250,8 @@ int __low_level_init(void)
#endif
/*---------------------------------------------------------------------------*/
void
msp430_sync_dco(void) {
msp430_sync_dco(void)
{
uint16_t oldcapture;
int16_t diff;
/* DELTA_2 assumes an ACLK of 32768 Hz */
@ -260,7 +287,7 @@ msp430_sync_dco(void) {
if(DCOCTL == 0x00) { /* Did DCO roll over? */
BCSCTL1++;
}
/* -> Select next higher RSEL */
/* -> Select next higher RSEL */
}
}

55
cpu/msp430/f2xxx/uart0.c
View File

@ -51,6 +51,11 @@ static volatile uint8_t transmitting;
#define TX_WITH_INTERRUPT 1
#endif /* UART0_CONF_TX_WITH_INTERRUPT */
#ifdef UART0_CONF_RX_WITH_DMA
#define RX_WITH_DMA UART0_CONF_RX_WITH_DMA
#else /* UART0_CONF_RX_WITH_DMA */
#define RX_WITH_DMA 1
#endif /* UART0_CONF_RX_WITH_DMA */
#if TX_WITH_INTERRUPT
#define TXBUFSIZE 64
@ -59,6 +64,30 @@ static struct ringbuf txbuf;
static uint8_t txbuf_data[TXBUFSIZE];
#endif /* TX_WITH_INTERRUPT */
#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) {
uart0_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
uart0_active(void)
@ -69,6 +98,9 @@ uart0_active(void)
void
uart0_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
uart0_input_handler = input;
}
/*---------------------------------------------------------------------------*/
@ -100,7 +132,7 @@ uart0_writeb(unsigned char c)
#endif /* TX_WITH_INTERRUPT */
}
/*---------------------------------------------------------------------------*/
#if ! NETSTACK_CONF_WITH_IPV4 /* If NETSTACK_CONF_WITH_IPV4 is defined, putchar() is defined by the SLIP driver */
#if !NETSTACK_CONF_WITH_IPV4 /* If NETSTACK_CONF_WITH_IPV4 is defined, putchar() is defined by the SLIP driver */
#endif /* ! NETSTACK_CONF_WITH_IPV4 */
/*---------------------------------------------------------------------------*/
/**
@ -135,8 +167,24 @@ uart0_init(unsigned long ubr)
ringbuf_init(&txbuf, txbuf_data, sizeof(txbuf_data));
IE2 |= UCA0TXIE; /* Enable UCA0 TX interrupt */
#endif /* TX_WITH_INTERRUPT */
#if RX_WITH_DMA
IE2 &= ~UCA0RXIE; /* disable USART0 RX interrupt */
/* UART0_RX trigger */
DMACTL0 = DMA0TSEL_3;
/* source address = UCA0RXBUF */
DMA0SA = (unsigned int)&UCA0RXBUF;
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(USCIAB0RX, uart0_rx_interrupt)
{
uint8_t c;
@ -148,18 +196,19 @@ ISR(USCIAB0RX, uart0_rx_interrupt)
c = UCA0RXBUF;
if(uart0_input_handler != NULL) {
if(uart0_input_handler(c)) {
LPM4_EXIT;
LPM4_EXIT;
}
}
}
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
#endif /* !RX_WITH_DMA */
/*---------------------------------------------------------------------------*/
#if TX_WITH_INTERRUPT
ISR(USCIAB0TX, uart0_tx_interrupt)
{
ENERGEST_ON(ENERGEST_TYPE_IRQ);
if((IFG2 & UCA0TXIFG)){
if((IFG2 & UCA0TXIFG)) {
if(ringbuf_elements(&txbuf) == 0) {
transmitting = 0;

17
platform/z1/contiki-conf.h
View File

@ -31,7 +31,6 @@
#ifndef CONTIKI_CONF_H
#define CONTIKI_CONF_H
#include "platform-conf.h"
#define XMAC_CONF_COMPOWER 1
@ -58,8 +57,7 @@
#define CXMAC_CONF_ANNOUNCEMENTS 0
#define XMAC_CONF_ANNOUNCEMENTS 0
#define QUEUEBUF_CONF_NUM 4
#define QUEUEBUF_CONF_NUM 4
#else /* NETSTACK_CONF_WITH_IPV6 */
@ -108,8 +106,7 @@
#define SHELL_VARS_CONF_RAM_BEGIN 0x1100
#define SHELL_VARS_CONF_RAM_END 0x2000
#define CFS_CONF_OFFSET_TYPE long
#define CFS_CONF_OFFSET_TYPE long
#define PROFILE_CONF_ON 0
#define ENERGEST_CONF_ON 1
@ -127,8 +124,9 @@
#define PROCESS_CONF_STATS 1
/*#define PROCESS_CONF_FASTPOLL 4*/
#define UART0_CONF_TX_WITH_INTERRUPT 0 /* So far, printfs without interrupt. */
#define UART0_CONF_TX_WITH_INTERRUPT 0 // So far, printfs without interrupt.
#define UART0_CONF_RX_WITH_DMA 0
#ifdef NETSTACK_CONF_WITH_IPV6
@ -144,7 +142,7 @@
/* Handle 10 routes */
#define UIP_CONF_MAX_ROUTES 15
#define UIP_CONF_ND6_SEND_RA 0
#define UIP_CONF_ND6_SEND_RA 0
#define UIP_CONF_ND6_REACHABLE_TIME 600000
#define UIP_CONF_ND6_RETRANS_TIMER 10000
@ -154,7 +152,7 @@
#define UIP_CONF_IPV6_REASSEMBLY 0
#define UIP_CONF_NETIF_MAX_ADDRESSES 3
#define UIP_CONF_IP_FORWARD 0
#define UIP_CONF_BUFFER_SIZE 140
#define UIP_CONF_BUFFER_SIZE 140
#define SICSLOWPAN_CONF_COMPRESSION SICSLOWPAN_COMPRESSION_HC06
#ifndef SICSLOWPAN_CONF_FRAG
@ -186,11 +184,8 @@
#define UIP_CONF_TCP_SPLIT 0
#ifdef PROJECT_CONF_H
#include PROJECT_CONF_H
#endif /* PROJECT_CONF_H */
#endif /* CONTIKI_CONF_H */