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tools/lib/: added interrupt_wait support to atusb and atusb-spi driver

- atusb-common.c (atusb_open): claim interface, so that we can do bulk
  I/O without complaints from the kernel
- atusb-common.h (atusb_interrupt_wait), atusb-common.c: blocking read
  for interrupt status byte on EP1
- atusb.c (atusb_driver), atusb-spi.c (atusb_spi_driver): provide the
  interrupt_wait operation
This commit is contained in:
Werner Almesberger 2011-06-20 16:06:51 -03:00
parent e6f0a1d410
commit 110ecf67a1
4 changed files with 71 additions and 0 deletions

View File

@ -15,10 +15,12 @@
#include <stdlib.h>
#include <stdio.h>
#include <usb.h>
#include <errno.h>
#include "atusb/ep0.h"
#include "atusb/usb-ids.h"
#include "at86rf230.h"
#include "usbopen.h"
#include "driver.h"
#include "atusb-common.h"
@ -53,6 +55,7 @@ void *atusb_open(const char *arg)
{
usb_dev_handle *dev;
struct atusb_dsc *dsc;
int res;
usb_unrestrict();
if (arg)
@ -63,6 +66,12 @@ void *atusb_open(const char *arg)
return NULL;
}
res = usb_claim_interface(dev, 0);
if (res) {
fprintf(stderr, "usb_claim_interface: %d\n", res);
return NULL;
}
dsc = malloc(sizeof(*dsc));
if (!dsc) {
perror("malloc");
@ -186,6 +195,64 @@ int atusb_interrupt(void *handle)
}
/*
* The logic here is a bit tricky. Assuming that we can get a lot of
* interrupts, system state can change as follows:
*
* Event IRQ_STATUS EP1 on atusb EP1 on host irq
* INT (var)
* -------------------- ------- --- ------------ ----------- -----
* interrupt A A H EP_IDLE - -
* INT0 handler - - EP_TX (A) - -
* interrupt B B H EP_TX (A) - -
* INT0 handler B H EP_TX (A) - -
* IN from host B H EP_IDLE A -
* interrupt C B+C H EP_IDLE A -
* call to atusb_interrupt_wait
* read IRQ_STATUS - - EP_IDLE A B+C
* interrupt D D H EP_IDLE A B+C
* INT0 handler - - EP_TX (D) A B+C
* IN from host - - EP_IDLE A, D B+C
* usb_bulk_read - - EP_IDLE - A+B+C+D
* usb_bulk_read -> no more data, done
*
* We therefore have to consider interrupts queued up at the host and pending
* in REG_IRQ_STATUS in addition to anything that may arrive while we wait.
*/
int atusb_interrupt_wait(void *handle, int timeout_ms)
{
struct atusb_dsc *dsc = handle;
uint8_t irq, buf[100];
int res, i;
if (dsc->error)
return 0;
irq = atusb_driver.reg_read(handle, REG_IRQ_STATUS);
if (irq)
timeout_ms = 1;
while (1) {
res = usb_bulk_read(dsc->dev, 1,
(char *) &buf, sizeof(buf), timeout_ms);
if (res == -ETIMEDOUT)
break;
if (res < 0) {
fprintf(stderr, "usb_bulk_read: %d\n", res);
dsc->error = 1;
return 0;
/* < 0 is already taken by atrf_interrupt_wait */
}
timeout_ms = 1;
for (i = 0; i != res; i++)
irq |= buf[i];
}
return irq;
}
/* ----- CLKM handling ----------------------------------------------------- */

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@ -34,6 +34,8 @@ void atusb_reset_rf(void *handle);
void atusb_test_mode(void *handle);
void atusb_slp_tr(void *handle, int on, int pulse);
int atusb_interrupt(void *handle);
int atusb_interrupt_wait(void *handle, int timeout_ms);
int atusb_set_clkm(void *handle, int mhz);
#endif /* !ATUSB_COMMON_H */

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@ -168,4 +168,5 @@ struct atrf_driver atusb_spi_driver = {
.sram_write = atusb_spi_sram_write,
.sram_read = atusb_spi_sram_read,
.interrupt = atusb_interrupt,
.interrupt_wait = atusb_interrupt_wait,
};

View File

@ -162,4 +162,5 @@ struct atrf_driver atusb_driver = {
.sram_write = atusb_sram_write,
.sram_read = atusb_sram_read,
.interrupt = atusb_interrupt,
.interrupt_wait = atusb_interrupt_wait,
};