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modified busy waiting loops (new function: waitfor(us, condition) to only wait for a certain time until the expected condition comes true, otherwise just return without the job done

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This commit is contained in:
Markus Fröschle
2012-11-17 14:22:34 +00:00
parent 08b35e4997
commit 913ea1f46a
3 changed files with 79 additions and 13 deletions
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29
sources/BaS.c
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@@ -9,6 +9,7 @@
#include "startcf.h"
#include "cache.h"
#include "bas_printf.h"
#include "bas_types.h"
/* imported routines */
extern int mmu_init();
@@ -18,7 +19,8 @@ extern void sd_card_idle();
extern int sd_card_init();
/* wait...() routines moved to sysinit.c */
extern void wait(uint32_t us);
extern inline void wait(uint32_t us);
extern inline bool waitfor(uint32_t us,int (*condition)(void));
/* Symbols from the linker script */
extern uint8_t _STRAM_END[];
@@ -32,10 +34,27 @@ extern uint8_t _EMUTOS[];
extern uint8_t _EMUTOS_SIZE[];
#define EMUTOS_SIZE ((uint32_t)_EMUTOS_SIZE) /* size of EmuTOS, in bytes */
static inline bool pic_txready(void)
{
if (MCF_PSC3_PSCSR & MCF_PSC_PSCSR_TXRDY)
return TRUE;
return FALSE;
}
static inline bool pic_rxready(void)
{
if (MCF_PSC3_PSCSR & MCF_PSC_PSCSR_RXRDY)
return TRUE;
return FALSE;
}
void write_pic_byte(uint8_t value)
{
/* Wait until the tramsmitter is ready */
while (!(MCF_PSC3_PSCSR & MCF_PSC_PSCSR_TXRDY));
/* Wait until the tramsmitter is ready or 1000us are passed */
waitfor(1000, pic_txready);
//while (!(MCF_PSC3_PSCSR & MCF_PSC_PSCSR_TXRDY));
/* Transmit the byte */
//MCF_PSC3_PSCTB_8BIT = value; // This define is actually 32-bit
@@ -44,8 +63,8 @@ void write_pic_byte(uint8_t value)
uint8_t read_pic_byte(void)
{
/* Wait until a byte has been received */
while (!(MCF_PSC3_PSCSR & MCF_PSC_PSCSR_RXRDY));
/* Wait until a byte has been received or 1000us are passed */
waitfor(1000, pic_rxready);
/* Return the received byte */
//return MCF_PSC3_PSCRB_8BIT; // This define is actually 32-bit