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#include "project.h"
#define NCS (GPIO7)
#define NCS_PORT GPIOG
#define SCK (GPIO3)
#define SCK_PORT GPIOB
#define MOSI (GPIO5)
#define MOSI_PORT GPIOB
static void
set (int sck, int ncs, int mosi)
{
if (sck)
SET (SCK);
else
CLEAR (SCK);
if (ncs)
SET (NCS);
else
CLEAR (NCS);
if (mosi)
SET (MOSI);
else
CLEAR (MOSI);
//delay_us(10);
}
static void
spip_send_8 (uint8_t wot)
{
int i;
for (i = 0; i < 8; ++i) {
set (0, 0, wot & 0x80);
set (1, 0, wot & 0x80);
set (0, 0, wot & 0x80);
wot <<= 1;
}
}
static int mutex = 0;
static int
lock (void)
{
if (__sync_add_and_fetch (&mutex, 1) != 1) {
__sync_sub_and_fetch (&mutex, 1);
return -1;
}
return 0;
}
static void
unlock (void)
{
__sync_sub_and_fetch (&mutex, 1);
}
static void
write_reg (uint8_t reg, uint8_t data)
{
while (lock());
set (0, 1, 0);
set (0, 0, 0);
spip_send_8 (reg);
spip_send_8 (data);
set (0, 0, 0);
set (0, 1, 0);
unlock();
}
static void write_pair (uint8_t reg, int d)
{
write_reg (reg, d / 10);
write_reg (reg - 1, (d % 10) | 0x80);
}
void max7219_write (int d, int h, int m, int s)
{
write_pair (8, d);
write_pair (6, h);
write_pair (4, m);
write_pair (2, s);
}
void max7219_dispatch (void)
{
uint32_t now = HW_CLOCK_REG;
uint64_t abs = abs_extend (now);
EPOCH e = pll_decompose (abs);
UTC u = time_epoch_to_utc (e);
max7219_write (u.mday, u.hour, u.minute, u.second);
}
void
max7219_init (int on)
{
MAP_OUTPUT_PP (SCK);
MAP_OUTPUT_PP (NCS);
MAP_OUTPUT_PP (MOSI);
set (0, 1, 0);
if (on) {
write_reg (0xc, 0x1); //Power up
write_reg (0xf, 0x0); //normal mode
write_reg (0x9, 0xff); //BCD decode
write_reg (0xb, 0x7); //8 digits
write_reg (0xa, 0x8); //intensity
} else {
write_reg (0xc, 0x0); //Power up
}
}
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