deac/osd-contiki
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

Options to extend mc1322x fifo to RAM buffer, or use hardware flow control with tunslip6.

Browse source
This commit is contained in:
dak664 2011-04-08 15:15:16 -04:00
parent 89741bd322
commit 2e14df3981
5 changed files with 115 additions and 30 deletions
Download patch file Download diff file Expand all files Collapse all files

80
cpu/mc1322x/lib/uart1.c
View file

@ -36,43 +36,91 @@
#include <mc1322x.h>
#include <stdint.h>
volatile char u1_tx_buf[1024];
volatile uint32_t u1_head, u1_tail;
volatile char u1_tx_buf[UART1_TX_BUFFERSIZE];
volatile uint32_t u1_tx_head, u1_tx_tail;
#if UART1_RX_BUFFERSIZE > 32
volatile char u1_rx_buf[UART1_RX_BUFFERSIZE-32];
volatile uint32_t u1_rx_head, u1_rx_tail;
#endif
void uart1_isr(void) {
#if UART1_RX_BUFFERSIZE > 32
if (*UART1_USTAT & ( 1 << 6)) { //receive interrupt
while( *UART1_URXCON != 0 ) { //flush the hardware fifo into the software buffer
uint32_t u1_rx_tail_next;
u1_rx_tail_next = u1_rx_tail+1;
if (u1_rx_tail_next >= sizeof(u1_rx_buf))
u1_rx_tail_next = 0;
if (u1_rx_head != u1_rx_tail_next) {
u1_rx_buf[u1_rx_tail]= *UART1_UDATA;
u1_rx_tail = u1_rx_tail_next;
}
}
return;
}
#endif
while( *UART1_UTXCON != 0 ) {
if (u1_head == u1_tail) {
if (u1_tx_head == u1_tx_tail) {
#if UART1_RX_BUFFERSIZE > 32
*UART1_UCON |= (1 << 13); /*disable tx interrupt */
#else
disable_irq(UART1);
#endif
return;
}
*UART1_UDATA = u1_tx_buf[u1_tail];
u1_tail++;
if (u1_tail >= sizeof(u1_tx_buf))
u1_tail = 0;
*UART1_UDATA = u1_tx_buf[u1_tx_tail];
u1_tx_tail++;
if (u1_tx_tail >= sizeof(u1_tx_buf))
u1_tx_tail = 0;
}
}
void uart1_putc(char c) {
/* disable UART1 since */
/* UART1 isr modifies u1_head and u1_tail */
disable_irq(UART1);
/* UART1 isr modifies u1_tx_head and u1_tx_tail */
#if UART1_RX_BUFFERSIZE > 32
*UART1_UCON |= (1 << 13); /*disable tx interrupt */
#else
disable_irq(UART1);
#endif
if( (u1_head == u1_tail) &&
if( (u1_tx_head == u1_tx_tail) &&
(*UART1_UTXCON != 0)) {
*UART1_UDATA = c;
} else {
u1_tx_buf[u1_head] = c;
u1_head += 1;
if (u1_head >= sizeof(u1_tx_buf))
u1_head = 0;
if (u1_head == u1_tail) { /* drop chars when no room */
if (u1_head) { u1_head -=1; } else { u1_head = sizeof(u1_tx_buf); }
u1_tx_buf[u1_tx_head] = c;
u1_tx_head += 1;
if (u1_tx_head >= sizeof(u1_tx_buf))
u1_tx_head = 0;
if (u1_tx_head == u1_tx_tail) { /* drop chars when no room */
if (u1_tx_head) { u1_tx_head -=1; } else { u1_tx_head = sizeof(u1_tx_buf); }
}
#if UART1_RX_BUFFERSIZE > 32
*UART1_UCON &= ~(1 << 13); /*enable tx interrupt */
#else
enable_irq(UART1);
#endif
}
}
uint8_t uart1_getc(void) {
#if UART1_RX_BUFFERSIZE > 32
/* First pull from the ram buffer */
uint8_t c=0;
if (u1_rx_head != u1_rx_tail) {
c = u1_rx_buf[u1_rx_head++];
if (u1_rx_head >= sizeof(u1_rx_buf))
u1_rx_head=0;
return c;
}
#endif
/* Then pull from the hardware fifo */
while(uart1_can_get() == 0) { continue; }
return *UART1_UDATA;
}