#include "avr_uart.h"
#include "sim_hex.h"
-DEFINE_FIFO(uint8_t, uart_fifo, 128);
+DEFINE_FIFO(uint8_t, uart_fifo, 64);
static avr_cycle_count_t avr_uart_txc_raise(struct avr_t * avr, avr_cycle_count_t when, void * param)
{
avr_uart_t * p = (avr_uart_t *)param;
if (avr_regbit_get(avr, p->txen)) {
- // if the interrupts are not used, still raised the UDRE and TXC flaga
+ // if the interrupts are not used, still raised the UDRE and TXC flag
avr_raise_interrupt(avr, &p->udrc);
avr_raise_interrupt(avr, &p->txc);
}
avr_uart_t * p = (avr_uart_t *)param;
uint8_t v = avr_core_watch_read(avr, addr);
+ //static uint8_t old = 0xff; if (v != old) printf("UCSRA read %02x\n", v); old = v;
//
// if RX is enabled, and there is nothing to read, and
// the AVR core is reading this register, it's probably
{
avr_uart_t * p = (avr_uart_t *)param;
+ // clear the rxc bit in case the code is using pooling
+ avr_regbit_clear(avr, p->rxc.raised);
+
if (!avr_regbit_get(avr, p->rxen)) {
avr->data[addr] = 0;
// made to trigger potential watchpoints
}
uint8_t v = uart_fifo_read(&p->input);
+ //printf("UART read %02x %s\n", v, uart_fifo_isempty(&p->input) ? "EMPTY!" : "");
avr->data[addr] = v;
// made to trigger potential watchpoints
v = avr_core_watch_read(avr, addr);
avr_regbit_clear(avr, p->udrc.raised);
avr_cycle_timer_register_usec(avr, 100, avr_uart_txc_raise, p); // should be uart speed dependent
- static char buf[128];
- static int l = 0;
- buf[l++] = v < ' ' ? '.' : v;
- buf[l] = 0;
- if (v == '\n' || l == 127) {
- l = 0;
- printf("\e[32m%s\e[0m\n", buf);
+ if (p->flags & AVR_UART_FLAG_STDIO) {
+ static char buf[128];
+ static int l = 0;
+ buf[l++] = v < ' ' ? '.' : v;
+ buf[l] = 0;
+ if (v == '\n' || l == 127) {
+ l = 0;
+ printf("\e[32m%s\e[0m\n", buf);
+ }
}
-// printf("UDR%c(%02x) = %02x\n", p->name, addr, v);
+ // printf("UDR%c(%02x) = %02x\n", p->name, addr, v);
// tell other modules we are "outputing" a byte
if (avr_regbit_get(avr, p->txen))
avr_raise_irq(p->io.irq + UART_IRQ_OUTPUT, v);
avr_core_watch_write(avr, addr, v);
- // if writing one to a one, clear bit
- if (udre && avr_regbit_get(avr, p->udrc.raised))
- avr_regbit_clear(avr, p->udrc.raised);
- if (txc && avr_regbit_get(avr, p->txc.raised))
- avr_regbit_clear(avr, p->txc.raised);
+ avr_clear_interupt_if(avr, &p->udrc, udre);
+ avr_clear_interupt_if(avr, &p->txc, txc);
}
}
avr_cycle_timer_register_usec(avr, 100, avr_uart_rxc_raise, p); // should be uart speed dependent
uart_fifo_write(&p->input, value); // add to fifo
+// printf("UART IRQ in %02x (%d/%d) %s\n", value, p->input.read, p->input.write, uart_fifo_isfull(&p->input) ? "FULL!!" : "");
+
if (uart_fifo_isfull(&p->input))
avr_raise_irq(p->io.irq + UART_IRQ_OUT_XOFF, 1);
}
}
-#define AVR_IOCTL_UART_SET_FLAGS(_name) AVR_IOCTL_DEF('u','a','s',(_name))
-#define AVR_IOCTL_UART_GET_FLAGS(_name) AVR_IOCTL_DEF('u','a','g',(_name))
-
static int avr_uart_ioctl(struct avr_io_t * port, uint32_t ctl, void * io_param)
{
avr_uart_t * p = (avr_uart_t *)port;
return res;
}
-
static avr_io_t _io = {
.kind = "uart",
.reset = avr_uart_reset,
// printf("%s UART%c UDR=%02x\n", __FUNCTION__, p->name, p->r_udr);
- // allocate this module's IRQ
- p->io.irq_count = UART_IRQ_COUNT;
- p->io.irq = avr_alloc_irq(0, p->io.irq_count);
- p->io.irq_ioctl_get = AVR_IOCTL_UART_GETIRQ(p->name);
-
- p->flags = AVR_UART_FLAG_POOL_SLEEP;
+ p->flags = AVR_UART_FLAG_POOL_SLEEP|AVR_UART_FLAG_STDIO;
avr_register_io(avr, &p->io);
avr_register_vector(avr, &p->rxc);
avr_register_vector(avr, &p->txc);
avr_register_vector(avr, &p->udrc);
+ // allocate this module's IRQ
+ avr_io_setirqs(&p->io, AVR_IOCTL_UART_GETIRQ(p->name), UART_IRQ_COUNT, NULL);
+
avr_register_io_write(avr, p->r_udr, avr_uart_write, p);
avr_register_io_read(avr, p->r_udr, avr_uart_read, p);
// monitor code that reads the rxc flag, and delay it a bit