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-rw-r--r--recipes-bsp/esp32spid/src/spi.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/recipes-bsp/esp32spid/src/spi.c b/recipes-bsp/esp32spid/src/spi.c
new file mode 100644
index 0000000..5bd0718
--- /dev/null
+++ b/recipes-bsp/esp32spid/src/spi.c
@@ -0,0 +1,284 @@
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include <linux/spi/spidev.h>
+
+#include <gpiod.h>
+#include <pthread.h>
+
+#include "msgq.h"
+#include "tun.h"
+#include "spi.h"
+
+static pthread_t rtscts_thd;
+static pthread_t worker_thd;
+static pthread_t handler_thd;
+static pthread_mutex_t mutex;
+
+struct gpiod_line *gpio_rts, *gpio_cts;
+static struct gpiod_line_bulk gpio_rtscts;
+
+static MSGQueue spi_bufq;
+static unsigned char *spi_bufq_array[SPI_SIZE_BUFQ];
+
+static MSGQueue spi_msgq_in;
+static unsigned char *spi_msgq_in_array[SPI_SIZE_MSGQ];
+
+static MSGQueue spi_msgq_out;
+static unsigned char *spi_msgq_out_array[SPI_SIZE_MSGQ];
+
+static uint32_t spi_speed = 5000000;
+static int spi_fd;
+
+static int _spi_xchg(unsigned char *buffer) {
+ int rv;
+ uint16_t len_tx;
+ uint16_t len_rx;
+ struct spi_ioc_transfer tr;
+
+ memset(&tr, 0, sizeof(tr));
+ tr.tx_buf = (unsigned long)buffer;
+ tr.rx_buf = (unsigned long)buffer;
+ tr.speed_hz = spi_speed,
+
+ len_tx = (uint16_t)buffer[1] << 8;
+ len_tx |= (uint16_t)buffer[2] & 0xFF;
+ if (len_tx > SPI_MTU) return SPI_ERR;
+
+ len_tx += SPI_SIZE_HDR;
+ // esp32 dma workaraund
+ if (len_tx < 8) {
+ len_tx = 8;
+ } else if (len_tx % 4 != 0) {
+ len_tx = (len_tx / 4 + 1) * 4;
+ }
+
+ tr.len = len_tx;
+
+ pthread_mutex_lock(&mutex);
+ rv = ioctl(spi_fd, SPI_IOC_MESSAGE(1), &tr);
+ if (rv < 0) return SPI_ERR_MSG;
+
+ len_rx = (uint16_t)buffer[1] << 8;
+ len_rx |= (uint16_t)buffer[2] & 0xFF;
+ if (len_rx > SPI_MTU) return SPI_ERR;
+
+ len_rx += SPI_SIZE_HDR;
+ if (len_rx > len_tx) {
+ tr.tx_buf = (unsigned long)NULL;
+ tr.rx_buf = (unsigned long)(buffer + len_tx);
+
+ len_tx = len_rx - len_tx;
+ // esp32 dma workaraund
+ if (len_tx < 8) {
+ len_tx = 8;
+ } else if (len_tx % 4 != 0) {
+ len_tx = (len_tx / 4 + 1) * 4;
+ }
+
+ tr.len = len_tx;
+
+ pthread_mutex_lock(&mutex);
+ rv = ioctl(spi_fd, SPI_IOC_MESSAGE(1), &tr);
+ if (rv < 0) return SPI_ERR_MSG;
+ }
+
+ return SPI_OK;
+}
+
+static void *spi_rtscts_handler(void *arg) {
+ MSGQueue *msgq_out = &spi_msgq_out;
+ int i, rv;
+ struct gpiod_line_bulk evt_lines;
+ struct gpiod_line_event event;
+
+ while (1) {
+ rv = gpiod_line_event_wait_bulk(&gpio_rtscts, NULL, &evt_lines);
+ if (rv < 0) continue;
+
+ for (i=0; i<gpiod_line_bulk_num_lines(&evt_lines); i++) {
+ struct gpiod_line *line;
+
+ line = gpiod_line_bulk_get_line(&evt_lines, i);
+ rv = gpiod_line_event_read(line, &event);
+ if (rv || (event.event_type != GPIOD_LINE_EVENT_RISING_EDGE)) continue;
+
+ switch (gpiod_line_offset(line)) {
+ case SPI_GPIO_RTS:
+ pthread_mutex_lock(&msgq_out->mutex);
+ pthread_cond_signal(&msgq_out->cond);
+ pthread_mutex_unlock(&msgq_out->mutex);
+ break;
+ case SPI_GPIO_CTS:
+ pthread_mutex_unlock(&mutex);
+ break;
+ }
+ }
+ }
+ return NULL;
+}
+
+static void *spi_worker(void *arg) {
+ MSGQueue *bufq = &spi_bufq;
+ MSGQueue *msgq_in = &spi_msgq_in;
+ MSGQueue *msgq_out = &spi_msgq_out;
+ int rv;
+ unsigned char *buffer;
+
+ while (1) {
+ pthread_mutex_lock(&msgq_out->mutex);
+ buffer = msgq_pop(msgq_out);
+ if ((buffer == NULL) && (gpiod_line_get_value(gpio_rts) == 1)) {
+ pthread_mutex_lock(&bufq->mutex);
+ buffer = msgq_pop(bufq);
+ pthread_mutex_unlock(&bufq->mutex);
+ }
+ if (buffer == NULL) {
+ pthread_cond_wait(&msgq_out->cond, &msgq_out->mutex);
+ buffer = msgq_pop(msgq_out);
+ }
+ pthread_mutex_unlock(&msgq_out->mutex);
+ if (buffer) {
+ rv = _spi_xchg(buffer);
+ if (rv || (buffer[0] == 0)) {
+ buffer[1] = 0;
+ buffer[2] = 0;
+ pthread_mutex_lock(&bufq->mutex);
+ rv = msgq_push(bufq, buffer);
+ pthread_mutex_unlock(&bufq->mutex);
+ } else {
+ pthread_mutex_lock(&msgq_in->mutex);
+ rv = msgq_push(msgq_in, buffer);
+ pthread_cond_signal(&msgq_in->cond);
+ pthread_mutex_unlock(&msgq_in->mutex);
+ }
+ }
+ }
+ return NULL;
+}
+
+static void *spi_handler(void *arg) {
+ MSGQueue *bufq = &spi_bufq;
+ MSGQueue *msgq_in = &spi_msgq_in;
+ unsigned char *buffer;
+ unsigned char mtype;
+ uint16_t len;
+ int rv;
+
+ while (1) {
+ pthread_mutex_lock(&msgq_in->mutex);
+ buffer = msgq_pop(msgq_in);
+ if (buffer == NULL) {
+ pthread_cond_wait(&msgq_in->cond, &msgq_in->mutex);
+ buffer = msgq_pop(msgq_in);
+ }
+ pthread_mutex_unlock(&msgq_in->mutex);
+ if (buffer) {
+ mtype = buffer[0];
+ len = (uint16_t)buffer[1] << 8;
+ len |= (uint16_t)buffer[2] & 0xFF;
+
+ switch (mtype) {
+ case SPI_MTYPE_TUN:
+ tun_write(buffer + SPI_SIZE_HDR, len);
+ break;
+ }
+ buffer[0] = 0;
+ buffer[1] = 0;
+ buffer[2] = 0;
+ pthread_mutex_lock(&bufq->mutex);
+ rv = msgq_push(bufq, buffer);
+ pthread_mutex_unlock(&bufq->mutex);
+ }
+ }
+}
+
+unsigned char *spi_alloc(void) {
+ MSGQueue *bufq = &spi_bufq;
+ unsigned char *ret;
+
+ pthread_mutex_lock(&bufq->mutex);
+ ret = msgq_pop(bufq);
+ pthread_mutex_unlock(&bufq->mutex);
+
+ return ret;
+}
+
+void spi_free(unsigned char *buffer) {
+ MSGQueue *bufq = &spi_bufq;
+
+ buffer[0] = 0;
+ buffer[1] = 0;
+ buffer[2] = 0;
+ pthread_mutex_lock(&bufq->mutex);
+ msgq_push(bufq, buffer);
+ pthread_mutex_unlock(&bufq->mutex);
+}
+
+int spi_xchg(unsigned char mtype, unsigned char *buffer, uint16_t len) {
+ int rv;
+ MSGQueue *msgq_out = &spi_msgq_out;
+
+ buffer[0] = mtype;
+ buffer[1] = len >> 8;
+ buffer[2] = len & 0xFF;
+
+ pthread_mutex_lock(&msgq_out->mutex);
+ rv = msgq_push(msgq_out, buffer);
+ pthread_cond_signal(&msgq_out->cond);
+ pthread_mutex_unlock(&msgq_out->mutex);
+
+ return rv;
+}
+
+int spi_init(char *fname) {
+ int rv, i;
+ struct gpiod_chip *gpio_chip;
+
+ spi_fd = open(fname, O_RDWR);
+ if (spi_fd < 0) return SPI_ERR_OPEN;
+
+ rv = ioctl(spi_fd, SPI_IOC_WR_MAX_SPEED_HZ, &spi_speed);
+ if (rv == -1) return SPI_ERR;
+
+ gpio_chip = gpiod_chip_open_by_name(SPI_GPIO_BANK);
+ if (gpio_chip == NULL) return SPI_ERR;
+
+ gpio_rts = gpiod_chip_get_line(gpio_chip, SPI_GPIO_RTS);
+ gpio_cts = gpiod_chip_get_line(gpio_chip, SPI_GPIO_CTS);
+ if ((gpio_rts == NULL) || (gpio_cts == NULL)) return SPI_ERR;
+
+ gpiod_line_bulk_init(&gpio_rtscts);
+ gpiod_line_bulk_add(&gpio_rtscts, gpio_rts);
+ gpiod_line_bulk_add(&gpio_rtscts, gpio_cts);
+ rv = gpiod_line_request_bulk_rising_edge_events(&gpio_rtscts, "rtscts");
+ if (rv) return SPI_ERR;
+
+ msgq_init(&spi_bufq, spi_bufq_array, SPI_SIZE_BUFQ);
+ msgq_init(&spi_msgq_in, spi_msgq_in_array, SPI_SIZE_MSGQ);
+ msgq_init(&spi_msgq_out, spi_msgq_out_array, SPI_SIZE_MSGQ);
+ for (i=0; i<SPI_SIZE_BUFQ; i++) {
+ msgq_push(&spi_bufq, malloc(SPI_SIZE_BUF));
+ }
+
+ rv = pthread_mutex_init(&mutex, NULL);
+ rv = pthread_create(&rtscts_thd, NULL, spi_rtscts_handler, NULL);
+ rv = pthread_create(&worker_thd, NULL, spi_worker, NULL);
+ rv = pthread_create(&handler_thd, NULL, spi_handler, NULL);
+
+ return SPI_OK;
+}
+
+int main(int argc, char *argv[]) {
+ int rv;
+
+ rv = spi_init("/dev/spidev0.0");
+ if (rv) printf("SPI INIT ERR\n");
+ rv = tun_init();
+ if (rv) printf("TUN INIT ERR\n");
+ tun_read(NULL);
+}
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