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mc1322x: build fixes for uart2

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This commit is contained in:
Mariano Alvira 2011-07-08 19:38:31 -04:00
parent e2d74fa0a5
commit e80f9eb4b5
8 changed files with 124 additions and 51 deletions
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86
cpu/mc1322x/lib/uart2.c
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@ -28,7 +28,7 @@
* SUCH DAMAGE.
*
* This file is part of libmc1322x: see http://mc1322x.devl.org
* for details.
* for details.
*
*
*/
@ -36,43 +36,91 @@
#include <mc1322x.h>
#include <stdint.h>
volatile char u2_tx_buf[64];
volatile uint32_t u2_head, u2_tail;
volatile char u2_tx_buf[UART2_TX_BUFFERSIZE];
volatile uint32_t u2_tx_head, u2_tx_tail;
#if UART2_RX_BUFFERSIZE > 32
volatile char u2_rx_buf[UART2_RX_BUFFERSIZE-32];
volatile uint32_t u2_rx_head, u2_rx_tail;
#endif
void uart2_isr(void) {
while( *UART1_UTXCON != 0 ) {
if (u2_head == u2_tail) {
#if UART2_RX_BUFFERSIZE > 32
if (*UART2_USTAT & ( 1 << 6)) { //receive interrupt
while( *UART2_URXCON != 0 ) { //flush the hardware fifo into the software buffer
uint32_t u2_rx_tail_next;
u2_rx_tail_next = u2_rx_tail+1;
if (u2_rx_tail_next >= sizeof(u2_rx_buf))
u2_rx_tail_next = 0;
if (u2_rx_head != u2_rx_tail_next) {
u2_rx_buf[u2_rx_tail]= *UART2_UDATA;
u2_rx_tail = u2_rx_tail_next;
}
}
return;
}
#endif
while( *UART2_UTXCON != 0 ) {
if (u2_tx_head == u2_tx_tail) {
#if UART2_RX_BUFFERSIZE > 32
*UART2_UCON |= (1 << 13); /*disable tx interrupt */
#else
disable_irq(UART2);
#endif
return;
}
*UART2_UDATA = u2_tx_buf[u2_tail];
u2_tail++;
if (u2_tail >= sizeof(u2_tx_buf))
u2_tail = 0;
*UART2_UDATA = u2_tx_buf[u2_tx_tail];
u2_tx_tail++;
if (u2_tx_tail >= sizeof(u2_tx_buf))
u2_tx_tail = 0;
}
}
void uart2_putc(char c) {
/* disable UART2 since */
/* UART2 isr modifies u2_head and u2_tail */
disable_irq(UART2);
/* UART2 isr modifies u2_tx_head and u2_tx_tail */
#if UART2_RX_BUFFERSIZE > 32
*UART2_UCON |= (1 << 13); /*disable tx interrupt */
#else
disable_irq(UART2);
#endif
if( (u2_head == u2_tail) &&
if( (u2_tx_head == u2_tx_tail) &&
(*UART2_UTXCON != 0)) {
*UART2_UDATA = c;
} else {
u2_tx_buf[u2_head] = c;
u2_head += 1;
if (u2_head >= sizeof(u2_tx_buf))
u2_head = 0;
if (u2_head == u2_tail) { /* drop chars when no room */
if (u2_head) { u2_head -=1; } else { u2_head = sizeof(u2_tx_buf); }
u2_tx_buf[u2_tx_head] = c;
u2_tx_head += 1;
if (u2_tx_head >= sizeof(u2_tx_buf))
u2_tx_head = 0;
if (u2_tx_head == u2_tx_tail) { /* drop chars when no room */
if (u2_tx_head) { u2_tx_head -=1; } else { u2_tx_head = sizeof(u2_tx_buf); }
}
enable_irq(UART1);
#if UART2_RX_BUFFERSIZE > 32
*UART2_UCON &= ~(1 << 13); /*enable tx interrupt */
#else
enable_irq(UART2);
#endif
}
}
uint8_t uart2_getc(void) {
#if UART2_RX_BUFFERSIZE > 32
/* First pull from the ram buffer */
uint8_t c=0;
if (u2_rx_head != u2_rx_tail) {
c = u2_rx_buf[u2_rx_head++];
if (u2_rx_head >= sizeof(u2_rx_buf))
u2_rx_head=0;
return c;
}
#endif
/* Then pull from the hardware fifo */
while(uart2_can_get() == 0) { continue; }
return *UART2_UDATA;
}