We can now read the transceiver's registers.

- fw/atspi/atspi.c (init_io, reset_rf): reset the transceiver after setting
  up the IOs. Contrary to what the manual claims, the chip only produce
  garbage if not reset.
- fw/atspi/ep0.c (my_setup): call reset_rf instead of open-coding the reset
- fw/atspi/atspi.c (init_io): added #ifdef'ed-out code to disable the
  pull-ups, and an explanation why we can't do this.
- tools/atspi-id/atspi-id.c (show_info): also read and print the
  transceiver's ID registers

fw/atspi/atspi.c

@@ -18,6 +18,17 @@
 #include "version.h"
 
 
+void reset_rf(void)
+{
+	int i;
+
+	nRST_RF = 0;
+	/* 11.4.12: min 625 ns */
+	for (i = 0; i != 10; i++);
+	nRST_RF = 1;
+}
+
+
 static void init_io(void)
 {
 	/*
@@ -53,6 +64,26 @@ static void init_io(void)
 	    ~((1 << 0) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
 	    /* change 1 << 0 to 1 << 2 once 100813 boards are reworked */
 	P3 = 0;
+
+#if 0
+	/*
+	 * We can *almost* disable the pull-ups. The only obstacle is that
+	 * MISO is not driven when not in use. So we either need an external
+	 * pull-up/down or keep all the pull-ups on.
+	 */
+
+	/*
+	 * Disable pull-ups
+	 */
+	GPIOCN |= WEAKPUD;
+#endif
+
+	/*
+	 * The manual says the reset is optional, but reality disagrees with
+	 * this optimistic assessment quite violently.
+	 */
+
+	reset_rf();
 }
 
 

fw/atspi/ep0.c

@@ -25,6 +25,9 @@
 #include "version.h"
 
 
+extern void reset_rf(void);
+
+
 #define debug(...)
 #define error(...)
 
@@ -138,9 +141,7 @@ static __bit my_setup(struct setup_request *setup) __reentrant
 
 	case ATSPI_TO_DEV(ATSPI_RF_RESET):
 		debug("ATSPI_RF_RESET\n");
-		nRST_RF = 0;
-		/* 11.4.12 min 625 ns */
-		nRST_RF = 1;
+		reset_rf();
 		return 1;
 
 	case ATSPI_TO_DEV(ATSPI_REG_WRITE):

tools/atspi-id/atspi-id.c

@@ -15,6 +15,7 @@
 #include <stdio.h>
 #include <usb.h>
 
+#include "at86rf230.h"
 #include "atspi/ep0.h"
 #include "atspi.h"
 
@@ -72,6 +73,7 @@ static void show_info(usb_dev_handle *dev)
 	uint8_t major, minor, target;
 	char buf[BUF_SIZE+1];	/* +1 for terminating \0 */
 	int len;
+	uint8_t part, version, man_id_0, man_id_1;
 
 	printf("%04x:%04x ",
 	    device->descriptor.idVendor, device->descriptor.idProduct);
@@ -85,6 +87,13 @@ static void show_info(usb_dev_handle *dev)
 		exit(1);
 	buf[len] = 0;
 	printf("%10s%s\n", "", buf);
+
+	part = atspi_reg_read(dev, AT86RF230_REG_PART_NUM);
+	version = atspi_reg_read(dev, AT86RF230_REG_VERSION_NUM);
+	man_id_0 = atspi_reg_read(dev, AT86RF230_REG_MAN_ID_0);
+	man_id_1 = atspi_reg_read(dev, AT86RF230_REG_MAN_ID_1);
+	printf("%10spart 0x%02x version %u manufacturer xxxx%02x%02x\n", "",
+	    part, version, man_id_1, man_id_0);
 }