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#include <stdlib.h>
#include <stdint.h>
#include "encoding.h"
#include "platform.h"
#include "eos.h"
#include "msgq.h"
#include "interrupt.h"
#include "event.h"
#include "board.h"
#include "spi.h"
#include "spi_priv.h"
#define SPI_MODE0 0x00
#define SPI_MODE1 0x01
#define SPI_MODE2 0x02
#define SPI_MODE3 0x03
#define SPI_FLAG_XCHG 0x10
#define SPI_CSID_NONE 1
#define MIN(X, Y) (((X) < (Y)) ? (X) : (Y))
#define MAX(X, Y) (((X) > (Y)) ? (X) : (Y))
static uint8_t spi_cspin;
static volatile uint8_t spi_state_flags;
static unsigned char spi_evt;
static unsigned char spi_in_xchg;
static uint32_t spi_state_len = 0;
static uint32_t spi_state_idx_tx = 0;
static uint32_t spi_state_idx_rx = 0;
static unsigned char *spi_state_buf = NULL;
static eos_evt_handler_t evt_handler[EOS_SPI_MAX_EVT];
static void spi_handle_evt(unsigned char type, unsigned char *buffer, uint16_t len) {
unsigned char idx = (type & ~EOS_EVT_MASK) - 1;
if (idx < EOS_SPI_MAX_EVT) {
evt_handler[idx](type, buffer, len);
} else {
eos_evtq_bad_handler(type, buffer, len);
}
}
int eos_spi_init(uint8_t wakeup_cause) {
int i;
for (i=0; i<EOS_SPI_MAX_EVT; i++) {
evt_handler[i] = eos_evtq_bad_handler;
}
eos_evtq_set_handler(EOS_EVT_SPI, spi_handle_evt);
eos_intr_set_priority(INT_SPI1_BASE, IRQ_PRIORITY_SPI_XCHG);
SPI1_REG(SPI_REG_SCKMODE) = SPI_MODE0;
SPI1_REG(SPI_REG_FMT) = SPI_FMT_PROTO(SPI_PROTO_S) |
SPI_FMT_ENDIAN(SPI_ENDIAN_MSB) |
SPI_FMT_DIR(SPI_DIR_RX) |
SPI_FMT_LEN(8);
/* for spi 9bit protocol */
GPIO_REG(GPIO_OUTPUT_EN) |= (1 << IOF_SPI1_SCK);
GPIO_REG(GPIO_OUTPUT_EN) |= (1 << IOF_SPI1_MOSI);
GPIO_REG(GPIO_INPUT_EN) |= (1 << IOF_SPI1_MISO);
eos_spi_enable();
// There is no way here to change the CS polarity.
// SPI1_REG(SPI_REG_CSDEF) = 0xFFFF;
return EOS_OK;
}
void eos_spi_configure(uint16_t div, int8_t csid, int8_t cspin, unsigned char evt) {
spi_state_flags = 0;
spi_evt = evt;
SPI1_REG(SPI_REG_SCKDIV) = div;
if (csid != -1) {
SPI1_REG(SPI_REG_CSID) = csid;
SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_AUTO;
} else {
spi_cspin = cspin;
SPI1_REG(SPI_REG_CSID) = SPI_CSID_NONE;
SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_OFF;
}
}
void eos_spi_start(uint16_t div, int8_t csid, int8_t cspin, unsigned char evt) {
eos_spi_configure(div, csid, cspin, evt);
eos_intr_set_handler(INT_SPI1_BASE, eos_spi_handle_xchg);
}
void eos_spi_stop(void) {
eos_spi_flush();
eos_intr_set_handler(INT_SPI1_BASE, NULL);
spi_evt = 0;
}
void eos_spi_enable(void) {
eos_intr_enable(INT_SPI1_BASE);
GPIO_REG(GPIO_IOF_SEL) &= ~SPI_IOF_MASK;
GPIO_REG(GPIO_IOF_EN) |= SPI_IOF_MASK;
}
void eos_spi_disable(void) {
GPIO_REG(GPIO_IOF_EN) &= ~SPI_IOF_MASK;
eos_intr_disable(INT_SPI1_BASE);
}
void eos_spi_set_handler(unsigned char evt, eos_evt_handler_t handler) {
if (handler == NULL) handler = eos_evtq_bad_handler;
if (evt && (evt <= EOS_SPI_MAX_EVT)) evt_handler[evt - 1] = handler;
}
__attribute__ ((section (".itim")))
void _eos_spi_xchg_init(unsigned char *buffer, uint16_t len, uint8_t flags) {
spi_state_flags &= 0xF0;
spi_state_flags |= (SPI_FLAG_XCHG | flags);
spi_state_buf = buffer;
spi_state_len = len;
spi_state_idx_tx = 0;
spi_state_idx_rx = 0;
}
static void spi_xchg_finish(void) {
uint8_t done = 0;
while (!done) {
clear_csr(mstatus, MSTATUS_MIE);
done = !(spi_state_flags & SPI_FLAG_XCHG);
if (!done) asm volatile ("wfi");
set_csr(mstatus, MSTATUS_MIE);
}
spi_in_xchg = 0;
}
void eos_spi_xchg(unsigned char *buffer, uint16_t len, uint8_t flags) {
if (spi_in_xchg) spi_xchg_finish();
spi_in_xchg = 1;
_eos_spi_xchg_init(buffer, len, flags);
eos_spi_cs_set();
SPI1_REG(SPI_REG_TXCTRL) = SPI_TXWM(SPI_SIZE_WM);
SPI1_REG(SPI_REG_IE) = SPI_IP_TXWM;
}
__attribute__ ((section (".itim")))
void eos_spi_handle_xchg(void) {
int i;
uint16_t sz_chunk = MIN(spi_state_len - spi_state_idx_tx, SPI_SIZE_CHUNK);
for (i=0; i<sz_chunk; i++) {
volatile uint32_t x = SPI1_REG(SPI_REG_TXFIFO);
if (x & SPI_TXFIFO_FULL) break;
SPI1_REG(SPI_REG_TXFIFO) = spi_state_buf[spi_state_idx_tx+i];
}
spi_state_idx_tx += i;
for (i=0; i<spi_state_idx_tx - spi_state_idx_rx; i++) {
volatile uint32_t x = SPI1_REG(SPI_REG_RXFIFO);
if (x & SPI_RXFIFO_EMPTY) break;
spi_state_buf[spi_state_idx_rx+i] = x & 0xFF;
}
spi_state_idx_rx += i;
if (spi_state_idx_tx == spi_state_len) {
if ((spi_state_idx_rx == spi_state_len) || (spi_state_flags & EOS_SPI_FLAG_TX)) {
spi_state_flags &= ~SPI_FLAG_XCHG;
if (!(spi_state_flags & EOS_SPI_FLAG_MORE)) eos_spi_cs_clear();
SPI1_REG(SPI_REG_IE) = 0x0;
if (spi_evt) eos_evtq_push_isr(EOS_EVT_SPI | spi_evt, spi_state_buf, spi_state_len);
} else {
SPI1_REG(SPI_REG_RXCTRL) = SPI_RXWM(MIN(spi_state_len - spi_state_idx_rx - 1, SPI_SIZE_WM - 1));
SPI1_REG(SPI_REG_IE) = SPI_IP_RXWM;
}
}
}
__attribute__ ((section (".itim")))
void eos_spi_cs_set(void) {
/* cs low */
if (SPI1_REG(SPI_REG_CSMODE) == SPI_CSMODE_OFF) {
GPIO_REG(GPIO_OUTPUT_VAL) &= ~(1 << spi_cspin);
} else {
SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_HOLD;
}
}
__attribute__ ((section (".itim")))
void eos_spi_cs_clear(void) {
/* cs high */
if (SPI1_REG(SPI_REG_CSMODE) == SPI_CSMODE_OFF) {
GPIO_REG(GPIO_OUTPUT_VAL) |= (1 << spi_cspin);
} else {
SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_AUTO;
}
}
uint8_t eos_spi_xchg8(uint8_t data, uint8_t flags) {
volatile uint32_t x = 0;
uint8_t rx = !(flags & EOS_SPI_FLAG_TX);
spi_state_flags &= 0xF0;
spi_state_flags |= flags;
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = data;
if (rx) {
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
}
return x & 0xFF;
}
uint16_t eos_spi_xchg16(uint16_t data, uint8_t flags) {
volatile uint32_t x = 0;
uint8_t rx = !(flags & EOS_SPI_FLAG_TX);
uint16_t r = 0;
spi_state_flags &= 0xF0;
spi_state_flags |= flags;
if (flags & EOS_SPI_FLAG_BSWAP) {
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF);
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0xFF00) >> 8;
} else {
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0xFF00) >> 8;
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF);
}
if (rx) {
if (flags & EOS_SPI_FLAG_BSWAP) {
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF);
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 8;
} else {
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 8;
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF);
}
}
return r;
}
uint32_t eos_spi_xchg24(uint32_t data, uint8_t flags) {
volatile uint32_t x = 0;
uint8_t rx = !(flags & EOS_SPI_FLAG_TX);
uint32_t r = 0;
spi_state_flags &= 0xF0;
spi_state_flags |= flags;
if (flags & EOS_SPI_FLAG_BSWAP) {
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x000000FF);
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x0000FF00) >> 8;
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF0000) >> 16;
} else {
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF0000) >> 16;
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x0000FF00) >> 8;
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x000000FF);
}
if (rx) {
if (flags & EOS_SPI_FLAG_BSWAP) {
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF);
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 8;
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 16;
} else {
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 16;
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 8;
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF);
}
}
return r;
}
uint32_t eos_spi_xchg32(uint32_t data, uint8_t flags) {
volatile uint32_t x = 0;
uint8_t rx = !(flags & EOS_SPI_FLAG_TX);
uint32_t r = 0;
spi_state_flags &= 0xF0;
spi_state_flags |= flags;
if (flags & EOS_SPI_FLAG_BSWAP) {
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x000000FF);
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x0000FF00) >> 8;
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF0000) >> 16;
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0xFF000000) >> 24;
} else {
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0xFF000000) >> 24;
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x00FF0000) >> 16;
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x0000FF00) >> 8;
while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL);
SPI1_REG(SPI_REG_TXFIFO) = (data & 0x000000FF);
}
if (rx) {
if (flags & EOS_SPI_FLAG_BSWAP) {
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF);
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 8;
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 16;
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 24;
} else {
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 24;
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 16;
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF) << 8;
while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
r |= (x & 0xFF);
}
}
return r;
}
void eos_spi_flush(void) {
volatile uint32_t x = 0;
if (spi_in_xchg) spi_xchg_finish();
SPI1_REG(SPI_REG_TXCTRL) = SPI_TXWM(1);
while (!x) {
if (SPI1_REG(SPI_REG_IP) & SPI_IP_TXWM) x = SPI1_REG(SPI_REG_RXFIFO) & SPI_RXFIFO_EMPTY;
}
}
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