spi: Use a timer to send the bytes out, when master

No longer output the bytes too fast, that could create collisions
with the SPI in IRQ.

Signed-off-by: Michel Pollet <buserror@gmail.com>

diff --git a/simavr/sim/avr_spi.c b/simavr/sim/avr_spi.c
index 7d7ffff..b2f45ac 100644 (file)
--- a/simavr/sim/avr_spi.c
+++ b/simavr/sim/avr_spi.c
@@ -22,6 +22,20 @@
 #include <stdio.h>
 #include "avr_spi.h"
 
+static avr_cycle_count_t avr_spi_raise(struct avr_t * avr, avr_cycle_count_t when, void * param)
+{
+       avr_spi_t * p = (avr_spi_t *)param;
+       
+       if (avr_regbit_get(avr, p->spe)) {
+               // in master mode, any byte is sent as it comes..
+               if (avr_regbit_get(avr, p->mstr)) {
+                       avr_raise_interrupt(avr, &p->spi);
+                       avr_raise_irq(p->io.irq + SPI_IRQ_OUTPUT, avr->data[p->r_spdr]);
+               }
+       }
+       return 0;
+}
+
 static uint8_t avr_spi_read(struct avr_t * avr, avr_io_addr_t addr, void * param)
 {
        avr_spi_t * p = (avr_spi_t *)param;
@@ -36,15 +50,9 @@ static void avr_spi_write(struct avr_t * avr, avr_io_addr_t addr, uint8_t v, voi
        avr_spi_t * p = (avr_spi_t *)param;
 
        if (addr == p->r_spdr) {
-//             printf("avr_spi_write = %02x\n", v);
+       //      printf("avr_spi_write = %02x\n", v);
                avr_core_watch_write(avr, addr, v);
-
-               if (avr_regbit_get(avr, p->spe)) {
-                       // in master mode, any byte is sent as it comes..
-                       if (avr_regbit_get(avr, p->mstr)) {
-                               avr_raise_irq(p->io.irq + SPI_IRQ_OUTPUT, v);
-                       }
-               }
+               avr_cycle_timer_register_usec(avr, 100, avr_spi_raise, p); // should be speed dependent
        }
 }