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replaced bit shifts with symbolic constants

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This commit is contained in:
Markus Fröschle
2012-10-16 09:17:52 +00:00
parent b640d6c45d
commit badfd377f7
1 changed files with 20 additions and 13 deletions
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33
sources/init_fpga.c
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@@ -7,6 +7,12 @@
#include <MCF5475.h>
#include "sysinit.h"
#define FPGA_STATUS (1 << 0)
#define FPGA_CLOCK (1 << 1)
#define FPGA_CONFIG (1 << 2)
#define FPGA_DATA0 (1 << 3)
#define FPGA_CONF_DONE (1 << 5)
/*
* load FPGA
*/
@@ -17,16 +23,17 @@ void init_fpga(void)
uart_out_word('FPGA');
MCF_GPIO_PODR_FEC1L &= ~(1 << 1); /* FPGA clock => low */
MCF_GPIO_PODR_FEC1L &= ~(1 << 2); /* FPGA config => low */
while (((MCF_GPIO_PPDSDR_FEC1L & (1 << 0))) || ((MCF_GPIO_PPDSDR_FEC1L & (1 << 5))));
MCF_GPIO_PODR_FEC1L &= ~FPGA_CLOCK; /* FPGA clock => low */
MCF_GPIO_PODR_FEC1L &= ~FPGA_CONFIG; /* FPGA config => low */
wait_10us();
MCF_GPIO_PODR_FEC1L |= (1 << 2);
while (((MCF_GPIO_PPDSDR_FEC1L & FPGA_STATUS)) || ((MCF_GPIO_PPDSDR_FEC1L & FPGA_CONF_DONE)));
wait_10us();
while (!MCF_GPIO_PPDSDR_FEC1L & (1 << 0))
MCF_GPIO_PODR_FEC1L |= FPGA_CONFIG; /* pull FPGA_CONFIG high */
wait_10us();
while (!(MCF_GPIO_PPDSDR_FEC1L & FPGA_STATUS)) /* wait until status becomes high */
{
wait_10us();
}
@@ -60,26 +67,26 @@ void init_fpga(void)
if ((value << i) & 0b10000000)
{
/* bit set -> toggle DATA0 to high */
MCF_GPIO_PODR_FEC1L |= (1 << 3);
MCF_GPIO_PODR_FEC1L |= FPGA_DATA0;
}
else
{
/* bit is cleared -> toggle DATA0 to low */
MCF_GPIO_PODR_FEC1L &= ~(1 << 3);
MCF_GPIO_PODR_FEC1L &= ~FPGA_DATA0;
}
/* toggle DCLK -> FPGA reads the bit */
MCF_GPIO_PODR_FEC1L |= 1;
MCF_GPIO_PODR_FEC1L &= ~1;
MCF_GPIO_PODR_FEC1L |= FPGA_CLOCK;
MCF_GPIO_PODR_FEC1L &= ~FPGA_CLOCK;
}
} while (!(MCF_GPIO_PPDSDR_FEC1L & (1 << 5)) && (fpga_data < FPGA_FLASH_DATA_END));
} while (!(MCF_GPIO_PPDSDR_FEC1L & FPGA_CONF_DONE) && (fpga_data < FPGA_FLASH_DATA_END));
if (fpga_data < FPGA_FLASH_DATA_END)
{
for (i = 0; i < 4000; i++)
{
/* toggle a little more since it's fun ;) */
MCF_GPIO_PODR_FEC1L |= 1;
MCF_GPIO_PODR_FEC1L &= ~1;
MCF_GPIO_PODR_FEC1L |= FPGA_CLOCK;
MCF_GPIO_PODR_FEC1L &= ~FPGA_CLOCK;
}
}
else