152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
#include <string.h>
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#include "asf/common/services/usb/class/cdc/device/udi_cdc.h"
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#include "asf/common2/services/delay/delay.h"
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#include "asf/sam0/drivers/sercom/usart/usart.h"
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#include "py/mphal.h"
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#include "py/mpstate.h"
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#include "mpconfigboard.h"
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#include "mphalport.h"
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// Store received characters on our own so that we can filter control characters
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// and act immediately on CTRL-C for example.
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// This is adapted from asf/thirdparty/wireless/addons/sio2host
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// Receive buffer
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static uint8_t usb_rx_buf[USB_RX_BUF_SIZE];
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// Receive buffer head
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static uint8_t usb_rx_buf_head;
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// Receive buffer tail
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static uint8_t usb_rx_buf_tail;
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// Number of bytes in receive buffer
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static volatile uint8_t usb_rx_count;
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static volatile bool mp_cdc_enabled = false;
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void mp_keyboard_interrupt(void);
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int interrupt_char;
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extern struct usart_module usart_instance;
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bool mp_cdc_enable(uint8_t port)
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{
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mp_cdc_enabled = true;
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return true;
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}
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void mp_cdc_disable(uint8_t port)
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{
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mp_cdc_enabled = false;
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}
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void usb_rx_notify(void)
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{
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if (mp_cdc_enabled) {
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while (udi_cdc_is_rx_ready()) {
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uint8_t c;
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c = udi_cdc_getc();
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if (c == interrupt_char) {
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mp_keyboard_interrupt();
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// Don't put the interrupt into the buffer, just continue.
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continue;
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}
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// Introducing critical section to avoid buffer corruption.
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cpu_irq_disable();
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// The count of characters present in receive buffer is
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// incremented.
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usb_rx_count++;
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usb_rx_buf[usb_rx_buf_tail] = c;
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if ((USB_RX_BUF_SIZE - 1) == usb_rx_buf_tail) {
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// Reached the end of buffer, revert back to beginning of
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// buffer.
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usb_rx_buf_tail = 0x00;
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} else {
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usb_rx_buf_tail++;
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}
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cpu_irq_enable();
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}
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}
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}
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int receive_usb() {
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if (0 == usb_rx_count) {
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return 0;
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}
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if (USB_RX_BUF_SIZE <= usb_rx_count) {
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// Bytes between head and tail are overwritten by new data. The
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// oldest data in buffer is the one to which the tail is pointing. So
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// reading operation should start from the tail.
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usb_rx_buf_head = usb_rx_buf_tail;
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// This is a buffer overflow case.But still only the number of bytes
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// equivalent to full buffer size are useful.
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usb_rx_count = USB_RX_BUF_SIZE;
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}
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// Copy from head.
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int data = usb_rx_buf[usb_rx_buf_head];
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usb_rx_buf_head++;
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usb_rx_count--;
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if ((USB_RX_BUF_SIZE) == usb_rx_buf_head) {
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usb_rx_buf_head = 0;
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}
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return data;
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}
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int mp_hal_stdin_rx_chr(void) {
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for (;;) {
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#ifdef USB_REPL
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if (mp_cdc_enabled && usb_rx_count > 0) {
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return receive_usb();
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}
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#endif
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#ifdef UART_REPL
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uint16_t temp;
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if (usart_read_wait(&usart_instance, &temp) == STATUS_OK) {
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return temp;
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}
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#endif
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// TODO(tannewt): Figure out how we can sleep while waiting for input and
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// add it here. The current UART implementation doesn't cause a wake.
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//__WFI();
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}
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}
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void mp_hal_stdout_tx_strn(const char *str, size_t len) {
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#ifdef UART_REPL
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usart_write_buffer_wait(&usart_instance, (uint8_t*) str, len);
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#endif
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#ifdef USB_REPL
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if (mp_cdc_enabled && udi_cdc_is_tx_ready()) {
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udi_cdc_write_buf(str, len);
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}
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#endif
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}
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void mp_hal_set_interrupt_char(int c) {
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if (c != -1) {
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mp_obj_exception_clear_traceback(MP_STATE_PORT(mp_kbd_exception));
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}
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extern int interrupt_char;
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interrupt_char = c;
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}
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void mp_hal_delay_ms(mp_uint_t delay) {
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delay_ms(delay);
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}
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void mp_hal_delay_us(mp_uint_t delay) {
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delay_us(delay);
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}
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