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#include "project.h"
#define SCLK 17
#define MOSI 18
#define NCS 19
#define MISO 20
#define READ 0x3
#define FAST_READ 0xb
static inline void d(void)
{
nrf_delay_us(1);
}
void
gt_init (void)
{
NRF_GPIO->PIN_CNF[SCLK] =
(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) |
(GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
(GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
(GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos) |
(GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
NRF_GPIO->PIN_CNF[MOSI] =
(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) |
(GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
(GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
(GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos) |
(GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
NRF_GPIO->PIN_CNF[NCS] =
(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) |
(GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
(GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
(GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos) |
(GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
NRF_GPIO->PIN_CNF[MISO] =
(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos) |
(GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) |
(GPIO_PIN_CNF_PULL_Pulldown << GPIO_PIN_CNF_PULL_Pos) |
(GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
(GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
NRF_GPIO->DIRSET = (1 << MOSI) | (1 << NCS) | (1<<SCLK);
NRF_GPIO->DIRCLR = (1 << MISO);
NRF_GPIO->OUTSET = (1 << NCS) | (1<<MISO);
}
void gt_read(uint32_t a,uint8_t * buf,size_t len)
{
uint32_t c;
uint8_t v;
NRF_GPIO->OUTCLR = (1 << SCLK);
d();
NRF_GPIO->OUTCLR = (1 << NCS);
NRF_GPIO->OUTSET = (1 << NCS);
d();
a |= READ << 24;
a=0x3000000;
a+=768+80;
for (c=0x80000000;c;c>>=1) {
if (c&a)
NRF_GPIO->OUTSET = (1 << MOSI);
else
NRF_GPIO->OUTCLR = (1 << MOSI);
d();
NRF_GPIO->OUTSET = (1 << SCLK);
d();
NRF_GPIO->OUTCLR = (1 << SCLK);
d();
}
while (len--) {
v=0;
for (c=0x80;c;c>>=1) {
if (NRF_GPIO->IN & (1<<MISO)) v|=c;
NRF_GPIO->OUTSET = (1 << SCLK);
d();
NRF_GPIO->OUTCLR = (1 << SCLK);
d();
}
*(buf++)=v;
}
d();
NRF_GPIO->OUTSET = (1 << NCS);
d();
}
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