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return from busy-waiting after a certain time

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This commit is contained in:
Markus Fröschle
2012-11-18 07:39:33 +00:00
parent fbb866e5c3
commit fee5213b83
1 changed files with 6 additions and 3 deletions
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9
BaS_gcc/sources/BaS.c
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@@ -34,6 +34,9 @@ extern uint8_t _EMUTOS[];
extern uint8_t _EMUTOS_SIZE[]; extern uint8_t _EMUTOS_SIZE[];
#define EMUTOS_SIZE ((uint32_t)_EMUTOS_SIZE) /* size of EmuTOS, in bytes */ #define EMUTOS_SIZE ((uint32_t)_EMUTOS_SIZE) /* size of EmuTOS, in bytes */
/*
* check if it is possible to transfer data to PIC
*/
static inline bool pic_txready(void) static inline bool pic_txready(void)
{ {
if (MCF_PSC3_PSCSR & MCF_PSC_PSCSR_TXRDY) if (MCF_PSC3_PSCSR & MCF_PSC_PSCSR_TXRDY)
@@ -42,6 +45,9 @@ static inline bool pic_txready(void)
return FALSE; return FALSE;
} }
/*
* check if it is possible to receive data from PIC
*/
static inline bool pic_rxready(void) static inline bool pic_rxready(void)
{ {
if (MCF_PSC3_PSCSR & MCF_PSC_PSCSR_RXRDY) if (MCF_PSC3_PSCSR & MCF_PSC_PSCSR_RXRDY)
@@ -54,10 +60,8 @@ void write_pic_byte(uint8_t value)
{ {
/* Wait until the tramsmitter is ready or 1000us are passed */ /* Wait until the tramsmitter is ready or 1000us are passed */
waitfor(1000, pic_txready); waitfor(1000, pic_txready);
//while (!(MCF_PSC3_PSCSR & MCF_PSC_PSCSR_TXRDY));
/* Transmit the byte */ /* Transmit the byte */
//MCF_PSC3_PSCTB_8BIT = value; // This define is actually 32-bit
*(volatile uint8_t*)(&MCF_PSC3_PSCTB_8BIT) = value; // Really 8-bit *(volatile uint8_t*)(&MCF_PSC3_PSCTB_8BIT) = value; // Really 8-bit
} }
@@ -67,7 +71,6 @@ uint8_t read_pic_byte(void)
waitfor(1000, pic_rxready); waitfor(1000, pic_rxready);
/* Return the received byte */ /* Return the received byte */
//return MCF_PSC3_PSCRB_8BIT; // This define is actually 32-bit
return *(volatile uint8_t*)(&MCF_PSC3_PSCTB_8BIT); // Really 8-bit return *(volatile uint8_t*)(&MCF_PSC3_PSCTB_8BIT); // Really 8-bit
} }