serial_irq: Add new generic/serial_irq.c code

Extract out common code from avr/serial.c, sam3x8e/serial.c, and
stm32f1/serial.c into a new generic/serial_irq.c file.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 9 insertions, 110 deletions

diff --git a/src/avr/serial.c b/src/avr/serial.c
index 5fcf54d6..4b72bf76 100644
--- a/src/avr/serial.c
+++ b/src/avr/serial.c
@@ -1,31 +1,14 @@
 // AVR serial port code.
 //
-// Copyright (C) 2016,2017  Kevin O'Connor <kevin@koconnor.net>
+// Copyright (C) 2016-2018  Kevin O'Connor <kevin@koconnor.net>
 //
 // This file may be distributed under the terms of the GNU GPLv3 license.
 
 #include <avr/interrupt.h> // USART0_RX_vect
-#include <string.h> // memmove
 #include "autoconf.h" // CONFIG_SERIAL_BAUD
-#include "board/io.h" // readb
-#include "board/misc.h" // console_sendf
-#include "command.h" // DECL_CONSTANT
-#include "irq.h" // irq_save
-#include "pgm.h" // READP
+#include "board/serial_irq.h" // serial_rx_byte
 #include "sched.h" // DECL_INIT
 
-static char receive_buf[192];
-static uint8_t receive_pos;
-static char transmit_buf[96];
-static uint8_t transmit_pos, transmit_max;
-
-
-/****************************************************************
- * Serial hardware
- ****************************************************************/
-
-DECL_CONSTANT(SERIAL_BAUD, CONFIG_SERIAL_BAUD);
-
 // Define serial port registers on AT90USB1286
 #if !defined(UCSR0A) && defined(UCSR1A)
 #define UCSR0A UCSR1A
@@ -64,107 +47,23 @@ DECL_INIT(serial_init);
 // Rx interrupt - data available to be read.
 ISR(USART0_RX_vect)
 {
-    uint8_t data = UDR0;
-    if (data == MESSAGE_SYNC)
-        sched_wake_tasks();
-    if (receive_pos >= sizeof(receive_buf))
-        // Serial overflow - ignore it as crc error will force retransmit
-        return;
-    receive_buf[receive_pos++] = data;
+    serial_rx_byte(UDR0);
 }
 
 // Tx interrupt - data can be written to serial.
 ISR(USART0_UDRE_vect)
 {
-    if (transmit_pos >= transmit_max)
+    uint8_t data;
+    int ret = serial_get_tx_byte(&data);
+    if (ret)
         UCSR0B &= ~(1<<UDRIE0);
     else
-        UDR0 = transmit_buf[transmit_pos++];
+        UDR0 = data;
 }
 
 // Enable tx interrupts
-static void
-enable_tx_irq(void)
-{
-    UCSR0B |= 1<<UDRIE0;
-}
-
-
-/****************************************************************
- * Console access functions
- ****************************************************************/
-
-// Remove from the receive buffer the given number of bytes
-static void
-console_pop_input(uint8_t len)
-{
-    uint8_t copied = 0;
-    for (;;) {
-        uint8_t rpos = readb(&receive_pos);
-        uint8_t needcopy = rpos - len;
-        if (needcopy) {
-            memmove(&receive_buf[copied], &receive_buf[copied + len]
-                    , needcopy - copied);
-            copied = needcopy;
-            sched_wake_tasks();
-        }
-        irqstatus_t flag = irq_save();
-        if (rpos != readb(&receive_pos)) {
-            // Raced with irq handler - retry
-            irq_restore(flag);
-            continue;
-        }
-        receive_pos = needcopy;
-        irq_restore(flag);
-        break;
-    }
-}
-
-// Process any incoming commands
 void
-console_task(void)
+serial_enable_tx_irq(void)
 {
-    uint8_t pop_count, rpos = readb(&receive_pos);
-    int8_t ret = command_find_block(receive_buf, rpos, &pop_count);
-    if (ret > 0)
-        command_dispatch(receive_buf, pop_count);
-    if (ret)
-        console_pop_input(pop_count);
-}
-DECL_TASK(console_task);
-
-// Encode and transmit a "response" message
-void
-console_sendf(const struct command_encoder *ce, va_list args)
-{
-    // Verify space for message
-    uint8_t tpos = readb(&transmit_pos), tmax = readb(&transmit_max);
-    if (tpos >= tmax) {
-        tpos = tmax = 0;
-        writeb(&transmit_max, 0);
-        writeb(&transmit_pos, 0);
-    }
-    uint8_t max_size = READP(ce->max_size);
-    if (tmax + max_size > sizeof(transmit_buf)) {
-        if (tmax + max_size - tpos > sizeof(transmit_buf))
-            // Not enough space for message
-            return;
-        // Disable TX irq and move buffer
-        writeb(&transmit_max, 0);
-        tpos = readb(&transmit_pos);
-        tmax -= tpos;
-        memmove(&transmit_buf[0], &transmit_buf[tpos], tmax);
-        writeb(&transmit_pos, 0);
-        writeb(&transmit_max, tmax);
-        enable_tx_irq();
-    }
-
-    // Generate message
-    char *buf = &transmit_buf[tmax];
-    uint8_t msglen = command_encodef(buf, ce, args);
-    command_add_frame(buf, msglen);
-
-    // Start message transmit
-    writeb(&transmit_max, tmax + msglen);
-    enable_tx_irq();
+    UCSR0B |= 1<<UDRIE0;
 }