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-
-
- #include "usb_dev.h"
- #include "usb_serial.h"
- #include "core_pins.h"
-
- #include <string.h> // for memcpy()
-
-
- #if defined(CDC_STATUS_INTERFACE) && defined(CDC_DATA_INTERFACE)
- #if F_CPU >= 20000000
-
- uint32_t usb_cdc_line_coding[2];
- volatile uint32_t usb_cdc_line_rtsdtr_millis;
- volatile uint8_t usb_cdc_line_rtsdtr=0;
- volatile uint8_t usb_cdc_transmit_flush_timer=0;
-
- static usb_packet_t *rx_packet=NULL;
- static usb_packet_t *tx_packet=NULL;
- static volatile uint8_t tx_noautoflush=0;
-
- #define TRANSMIT_FLUSH_TIMEOUT 5
-
-
- int usb_serial_getchar(void)
- {
- unsigned int i;
- int c;
-
- if (!rx_packet) {
- if (!usb_configuration) return -1;
- rx_packet = usb_rx(CDC_RX_ENDPOINT);
- if (!rx_packet) return -1;
- }
- i = rx_packet->index;
- c = rx_packet->buf[i++];
- if (i >= rx_packet->len) {
- usb_free(rx_packet);
- rx_packet = NULL;
- } else {
- rx_packet->index = i;
- }
- return c;
- }
-
-
- int usb_serial_peekchar(void)
- {
- if (!rx_packet) {
- if (!usb_configuration) return -1;
- rx_packet = usb_rx(CDC_RX_ENDPOINT);
- if (!rx_packet) return -1;
- }
- if (!rx_packet) return -1;
- return rx_packet->buf[rx_packet->index];
- }
-
-
- int usb_serial_available(void)
- {
- int count;
- count = usb_rx_byte_count(CDC_RX_ENDPOINT);
- if (rx_packet) count += rx_packet->len - rx_packet->index;
- return count;
- }
-
-
- int usb_serial_read(void *buffer, uint32_t size)
- {
- uint8_t *p = (uint8_t *)buffer;
- uint32_t qty, count=0;
-
- while (size) {
- if (!usb_configuration) break;
- if (!rx_packet) {
- rx:
- rx_packet = usb_rx(CDC_RX_ENDPOINT);
- if (!rx_packet) break;
- if (rx_packet->len == 0) {
- usb_free(rx_packet);
- goto rx;
- }
- }
- qty = rx_packet->len - rx_packet->index;
- if (qty > size) qty = size;
- memcpy(p, rx_packet->buf + rx_packet->index, qty);
- p += qty;
- count += qty;
- size -= qty;
- rx_packet->index += qty;
- if (rx_packet->index >= rx_packet->len) {
- usb_free(rx_packet);
- rx_packet = NULL;
- }
- }
- return count;
- }
-
-
- void usb_serial_flush_input(void)
- {
- usb_packet_t *rx;
-
- if (!usb_configuration) return;
- if (rx_packet) {
- usb_free(rx_packet);
- rx_packet = NULL;
- }
- while (1) {
- rx = usb_rx(CDC_RX_ENDPOINT);
- if (!rx) break;
- usb_free(rx);
- }
- }
-
-
- #define TX_PACKET_LIMIT 8
-
-
-
-
- #define TX_TIMEOUT_MSEC 70
- #if F_CPU == 256000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1706)
- #elif F_CPU == 240000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1600)
- #elif F_CPU == 216000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1440)
- #elif F_CPU == 192000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1280)
- #elif F_CPU == 180000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1200)
- #elif F_CPU == 168000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1100)
- #elif F_CPU == 144000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 932)
- #elif F_CPU == 120000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 764)
- #elif F_CPU == 96000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 596)
- #elif F_CPU == 72000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 512)
- #elif F_CPU == 48000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 428)
- #elif F_CPU == 24000000
- #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 262)
- #endif
-
-
-
-
-
- static uint8_t transmit_previous_timeout=0;
-
-
-
- int usb_serial_putchar(uint8_t c)
- {
- return usb_serial_write(&c, 1);
- }
-
-
- int usb_serial_write(const void *buffer, uint32_t size)
- {
- uint32_t ret = size;
- uint32_t len;
- uint32_t wait_count;
- const uint8_t *src = (const uint8_t *)buffer;
- uint8_t *dest;
-
- tx_noautoflush = 1;
- while (size > 0) {
- if (!tx_packet) {
- wait_count = 0;
- while (1) {
- if (!usb_configuration) {
- tx_noautoflush = 0;
- return -1;
- }
- if (usb_tx_packet_count(CDC_TX_ENDPOINT) < TX_PACKET_LIMIT) {
- tx_noautoflush = 1;
- tx_packet = usb_malloc();
- if (tx_packet) break;
- tx_noautoflush = 0;
- }
- if (++wait_count > TX_TIMEOUT || transmit_previous_timeout) {
- transmit_previous_timeout = 1;
- return -1;
- }
- yield();
- }
- }
- transmit_previous_timeout = 0;
- len = CDC_TX_SIZE - tx_packet->index;
- if (len > size) len = size;
- dest = tx_packet->buf + tx_packet->index;
- tx_packet->index += len;
- size -= len;
- while (len-- > 0) *dest++ = *src++;
- if (tx_packet->index >= CDC_TX_SIZE) {
- tx_packet->len = CDC_TX_SIZE;
- usb_tx(CDC_TX_ENDPOINT, tx_packet);
- tx_packet = NULL;
- }
- usb_cdc_transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
- }
- tx_noautoflush = 0;
- return ret;
- }
-
- int usb_serial_write_buffer_free(void)
- {
- uint32_t len;
-
- tx_noautoflush = 1;
- if (!tx_packet) {
- if (!usb_configuration ||
- usb_tx_packet_count(CDC_TX_ENDPOINT) >= TX_PACKET_LIMIT ||
- (tx_packet = usb_malloc()) == NULL) {
- tx_noautoflush = 0;
- return 0;
- }
- }
- len = CDC_TX_SIZE - tx_packet->index;
-
-
-
-
-
-
-
- tx_noautoflush = 0;
- return len;
- }
-
- void usb_serial_flush_output(void)
- {
- if (!usb_configuration) return;
- tx_noautoflush = 1;
- if (tx_packet) {
- usb_cdc_transmit_flush_timer = 0;
- tx_packet->len = tx_packet->index;
- usb_tx(CDC_TX_ENDPOINT, tx_packet);
- tx_packet = NULL;
- } else {
- usb_packet_t *tx = usb_malloc();
- if (tx) {
- usb_cdc_transmit_flush_timer = 0;
- usb_tx(CDC_TX_ENDPOINT, tx);
- } else {
- usb_cdc_transmit_flush_timer = 1;
- }
- }
- tx_noautoflush = 0;
- }
-
- void usb_serial_flush_callback(void)
- {
- if (tx_noautoflush) return;
- if (tx_packet) {
- tx_packet->len = tx_packet->index;
- usb_tx(CDC_TX_ENDPOINT, tx_packet);
- tx_packet = NULL;
- } else {
- usb_packet_t *tx = usb_malloc();
- if (tx) {
- usb_tx(CDC_TX_ENDPOINT, tx);
- } else {
- usb_cdc_transmit_flush_timer = 1;
- }
- }
- }
-
-
-
-
- #endif
- #endif
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