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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(1);
//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 void
write_reg (uint8_t reg, uint8_t data)
{
set (0, 1, 0);
set (0, 0, 0);
spip_send_8 (reg);
spip_send_8 (data);
spip_send_8 (reg);
spip_send_8 (data);
spip_send_8 (reg);
spip_send_8 (data);
set (0, 0, 0);
set (0, 1, 0);
}
static void
write_regs (uint8_t reg, uint8_t data1, uint8_t data2, uint8_t data3)
{
set (0, 1, 0);
set (0, 0, 0);
spip_send_8 (reg);
spip_send_8 (data3);
spip_send_8 (reg);
spip_send_8 (data2);
spip_send_8 (reg);
spip_send_8 (data1);
set (0, 0, 0);
set (0, 1, 0);
}
void
max7219_init (void)
{
MAP_OUTPUT_PP (SCK);
MAP_OUTPUT_PP (NCS);
MAP_OUTPUT_PP (MOSI);
set (0, 1, 0);
write_reg (0xc, 0x1); //Power up
write_reg (0xf, 0x0); //normal mode
write_reg (0x9, 0x0); //No decode
write_reg (0xb, 0x7); //8 digits
write_regs (0xa,15,15,15); //max brightness
write_reg (1,0);
write_reg (2,0);
write_reg (3,0);
write_reg (4,0);
write_reg (5,0);
write_regs (6,0xbe,0,0);
write_regs (7,0x47,0,0);
write_regs (8,0x3d,0,0);
}
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