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Diffstat (limited to 'yocto/esp32d/spi.c')
-rw-r--r--yocto/esp32d/spi.c411
1 files changed, 0 insertions, 411 deletions
diff --git a/yocto/esp32d/spi.c b/yocto/esp32d/spi.c
deleted file mode 100644
index db46a63..0000000
--- a/yocto/esp32d/spi.c
+++ /dev/null
@@ -1,411 +0,0 @@
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <assert.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 worker_thd;
-static pthread_t rtscts_thd;
-static pthread_t msg_handler_thd;
-static pthread_t tun_handler_thd;
-static pthread_mutex_t mutex;
-static pthread_cond_t cond;
-
-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_IN];
-
-static MSGQueue spi_msgq_out;
-static unsigned char *spi_msgq_out_array[SPI_SIZE_MSGQ_OUT];
-
-static uint32_t spi_speed = SPI_SPEED;
-static int spi_fd;
-static volatile int spi_cts;
-
-struct gpiod_line_request *request = NULL;
-
-static void _spi_wait4cts(void) {
- pthread_mutex_lock(&mutex);
- while (!spi_cts) {
- pthread_cond_wait(&cond, &mutex);
- }
- spi_cts = 0;
- pthread_mutex_unlock(&mutex);
-}
-
-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;
-
- if (buffer[0]) {
- 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;
- } else {
- /* nothing to send, reset esp32 spi transaction */
- tr.len = 1;
-
- _spi_wait4cts();
- rv = ioctl(spi_fd, SPI_IOC_MESSAGE(1), &tr);
- if (rv < 0) return SPI_ERR_MSG;
-
- /* receive SPI_SIZE_RECEIVE bytes in first transaction (estimate) */
- len_tx = SPI_SIZE_RECEIVE + SPI_SIZE_HDR;
- tr.len = len_tx;
- buffer[1] = 0;
- buffer[2] = 0;
- }
-
- _spi_wait4cts();
- 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;
-
- _spi_wait4cts();
- rv = ioctl(spi_fd, SPI_IOC_MESSAGE(1), &tr);
- if (rv < 0) return SPI_ERR_MSG;
- }
-
- return SPI_OK;
-}
-
-static void *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_request_get_value(request, SPI_GPIO_RTS) == GPIOD_LINE_VALUE_INACTIVE)) {
- 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[0] = 0;
- buffer[1] = 0;
- buffer[2] = 0;
- pthread_mutex_lock(&bufq->mutex);
- msgq_push(bufq, buffer);
- pthread_mutex_unlock(&bufq->mutex);
- } else {
- pthread_mutex_lock(&msgq_in->mutex);
- rv = msgq_push(msgq_in, buffer);
- if (rv == MSGQ_OK) pthread_cond_signal(&msgq_in->cond);
- pthread_mutex_unlock(&msgq_in->mutex);
-
- if (rv) {
- pthread_mutex_lock(&bufq->mutex);
- msgq_push(bufq, buffer);
- pthread_mutex_unlock(&bufq->mutex);
- }
- }
- }
- }
-
- return NULL;
-}
-
-static void *rtscts_handler(void *arg) {
- MSGQueue *msgq_out = &spi_msgq_out;
- struct gpiod_edge_event_buffer *event_buffer;
- struct gpiod_edge_event *event;
- int rv;
-
- event_buffer = gpiod_edge_event_buffer_new(1);
-
- while (1) {
- rv = gpiod_line_request_read_edge_events(request, event_buffer, 1);
- if (rv != 1) continue;
-
- event = gpiod_edge_event_buffer_get_event(event_buffer, 0);
- switch (gpiod_edge_event_get_line_offset(event)) {
- 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_lock(&mutex);
- spi_cts = 1;
- pthread_cond_signal(&cond);
- pthread_mutex_unlock(&mutex);
- break;
- }
- }
- }
-
- gpiod_edge_event_buffer_free(event_buffer);
- return NULL;
-}
-
-static void *msg_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);
- msgq_push(bufq, buffer);
- pthread_mutex_unlock(&bufq->mutex);
- }
- }
-
- return NULL;
-}
-
-static void *tun_handler(void *arg) {
- unsigned char *buffer;
- ssize_t len;
-
- while (1) {
- buffer = spi_alloc();
- if (buffer == NULL) continue;
-
- len = tun_read(buffer + SPI_SIZE_HDR, SPI_SIZE_BUF - SPI_SIZE_HDR);
- if (len < 0) {
- perror("tun read");
- continue;
- }
- spi_xchg(SPI_MTYPE_TUN, buffer, len);
- }
-
- return NULL;
-}
-
-unsigned char *spi_alloc(void) {
- MSGQueue *bufq = &spi_bufq;
- unsigned char *buffer;
-
- pthread_mutex_lock(&bufq->mutex);
- buffer = msgq_pop(bufq);
- pthread_mutex_unlock(&bufq->mutex);
-
- return buffer;
-}
-
-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) {
- MSGQueue *bufq = &spi_bufq;
- MSGQueue *msgq_out = &spi_msgq_out;
- int rv;
-
- buffer[0] = mtype;
- buffer[1] = len >> 8;
- buffer[2] = len & 0xFF;
-
- pthread_mutex_lock(&msgq_out->mutex);
- rv = msgq_push(msgq_out, buffer);
- if (rv == MSGQ_OK) pthread_cond_signal(&msgq_out->cond);
- pthread_mutex_unlock(&msgq_out->mutex);
-
- if (rv) {
- pthread_mutex_lock(&bufq->mutex);
- msgq_push(bufq, buffer);
- pthread_mutex_unlock(&bufq->mutex);
- }
-
- return rv;
-}
-
-int gpio_init(void) {
- struct gpiod_chip *chip = NULL;
- struct gpiod_line_settings *line_settings = NULL;
- struct gpiod_line_config *line_cfg = NULL;
- struct gpiod_request_config *req_cfg = NULL;
- int rv;
-
- unsigned int line_offsets[2] = { SPI_GPIO_RTS, SPI_GPIO_CTS };
-
- chip = gpiod_chip_open(SPI_GPIO_DEV);
- if (chip == NULL) goto gpio_init_fin;
-
- line_settings = gpiod_line_settings_new();
- if (line_settings == NULL) goto gpio_init_fin;
-
- gpiod_line_settings_set_direction(line_settings, GPIOD_LINE_DIRECTION_INPUT);
- gpiod_line_settings_set_edge_detection(line_settings, GPIOD_LINE_EDGE_FALLING);
- gpiod_line_settings_set_bias(line_settings, GPIOD_LINE_BIAS_PULL_UP);
-
- line_cfg = gpiod_line_config_new();
- if (line_cfg == NULL) goto gpio_init_fin;
-
- rv = gpiod_line_config_add_line_settings(line_cfg, line_offsets, 2, line_settings);
- if (rv) goto gpio_init_fin;
-
- req_cfg = gpiod_request_config_new();
- if (req_cfg == NULL) goto gpio_init_fin;
-
- gpiod_request_config_set_consumer(req_cfg, "rts-cts");
-
- request = gpiod_chip_request_lines(chip, req_cfg, line_cfg);
-
-gpio_init_fin:
- rv = (request ? SPI_OK : (chip ? SPI_ERR : SPI_ERR_OPEN));
-
- if (req_cfg) gpiod_request_config_free(req_cfg);
- if (line_cfg) gpiod_line_config_free(line_cfg);
- if (line_settings) gpiod_line_settings_free(line_settings);
- if (chip) gpiod_chip_close(chip);
-
- return rv;
-}
-
-int spi_init(void) {
- unsigned char *buffer;
- int rv, i;
-
- spi_fd = open(SPI_DEV, 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;
-
- rv = msgq_init(&spi_bufq, spi_bufq_array, SPI_SIZE_BUFQ);
- assert(rv == MSGQ_OK);
-
- rv = msgq_init(&spi_msgq_in, spi_msgq_in_array, SPI_SIZE_MSGQ_IN);
- assert(rv == MSGQ_OK);
-
- rv = msgq_init(&spi_msgq_out, spi_msgq_out_array, SPI_SIZE_MSGQ_OUT);
- assert(rv == MSGQ_OK);
-
- for (i=0; i<SPI_SIZE_BUFQ; i++) {
- buffer = malloc(SPI_SIZE_BUF);
- assert(buffer);
- msgq_push(&spi_bufq, buffer);
- }
-
- rv = pthread_mutex_init(&mutex, NULL);
- assert(rv == 0);
-
- rv = pthread_cond_init(&cond, NULL);
- assert(rv == 0);
-
- /* assret initial contitions */
- pthread_mutex_lock(&mutex);
- spi_cts = (gpiod_line_request_get_value(request, SPI_GPIO_CTS) == GPIOD_LINE_VALUE_INACTIVE);
- pthread_mutex_unlock(&mutex);
-
- rv = pthread_create(&worker_thd, NULL, worker, NULL);
- assert(rv == 0);
-
- rv = pthread_create(&rtscts_thd, NULL, rtscts_handler, NULL);
- assert(rv == 0);
-
- rv = pthread_create(&msg_handler_thd, NULL, msg_handler, NULL);
- assert(rv == 0);
-
- rv = pthread_create(&tun_handler_thd, NULL, tun_handler, NULL);
- assert(rv == 0);
-
- return SPI_OK;
-}
-
-int main(int argc, char *argv[]) {
- int rv;
-
- rv = tun_init(SPI_TUN_NAME);
- if (rv) printf("TUN INIT ERR\n");
-
- rv = gpio_init();
- if (rv) printf("GPIO INIT ERR\n");
-
- rv = spi_init();
- if (rv) printf("SPI INIT ERR\n");
-
- while (1);
-}
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