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Fixed NVRAM initialization.

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This commit is contained in:
Vincent Rivière
2012-11-13 00:10:01 +00:00
parent 0c23668b0f
commit 02aeeb262f
1 changed files with 72 additions and 24 deletions
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96
sources/BaS.c
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@@ -33,14 +33,83 @@ extern uint8_t _EMUTOS[];
extern uint8_t _EMUTOS_SIZE[];
#define EMUTOS_SIZE ((uint32_t)_EMUTOS_SIZE) /* size of EmuTOS, in bytes */
void write_pic_byte(uint8_t value)
{
/* Wait until the tramsmitter is ready */
while (!(MCF_PSC3_PSCSR & MCF_PSC_PSCSR_TXRDY));
/* 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
}
uint8_t read_pic_byte(void)
{
/* Wait until a byte has been received */
while (!(MCF_PSC3_PSCSR & MCF_PSC_PSCSR_RXRDY));
/* 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
}
void pic_init(void)
{
char answer[4];
xprintf("initialize the PIC: ");
/* Send the PIC initialization string */
write_pic_byte('A');
write_pic_byte('C');
write_pic_byte('P');
write_pic_byte('F');
/* Read the 3-char answer string. Should be "OK!". */
answer[0] = read_pic_byte();
answer[1] = read_pic_byte();
answer[2] = read_pic_byte();
answer[3] = '\0';
xprintf("%s\r\n", answer);
}
void nvram_init(void)
{
int i;
xprintf("Restore the NVRAM data: ");
/* Request for NVRAM backup data */
write_pic_byte(0x01);
/* Check answer type */
if (read_pic_byte() != 0x81)
{
// FIXME: PIC protocol error
xprintf("FAILED\r\n");
return;
}
/* Restore the NVRAM backup to the FPGA */
for (i = 0; i < 64; i++)
{
uint8_t data = read_pic_byte();
*(volatile uint8_t*)0xffff8961 = i;
*(volatile uint8_t*)0xffff8963 = data;
}
xprintf("finished\r\n");
}
/********************************************************************/
void BaS(void)
{
//int az_sectors;
int i;
uint8_t *src;
uint8_t *dst = (uint8_t *)TOS;
uint32_t *adr;
/*
az_sectors = sd_card_init();
@@ -49,30 +118,9 @@ void BaS(void)
sd_card_idle();
}
*/
/* Initialize the NVRAM */
xprintf("initialize the NVRAM: ");
MCF_PSC3_PSCTB_8BIT = 'ACPF';
wait_10ms();
* (volatile uint8_t *) &_MBAR[0x860C] = (uint8_t) (MCF_PSC3_PSCRB_8BIT);
* (volatile uint8_t *) &_MBAR[0x860C] = (uint8_t) (MCF_PSC3_PSCRB_8BIT);
* (volatile uint8_t *) &_MBAR[0x860C] = (uint8_t) (MCF_PSC3_PSCRB_8BIT);
xprintf("finished\r\n");
//MCF_PSC3_PSCTB_8BIT = 0x01; /* request RTC data */
* (volatile uint8_t *) &_MBAR[0x890C] = 0x01;
//if (MCF_PSC3_PSCRB_8BIT == 0x81)
if (* (volatile uint8_t *) &_MBAR[0X890C] == 0x81)
{
for (i = 0; i < 64; i++)
{
* (volatile int8_t *) 0xffff8963 = (uint8_t) MCF_PSC3_PSCRB_8BIT; /* Copy the NVRAM data from the PIC to the FPGA */
}
}
pic_init();
nvram_init();
xprintf("copy EmuTOS: ");