Some BlueCore devices are equipped with an 'Analogue In' pin which is
internally connected to a MUX and ADC. This patch adds the ability to
control the MUX and read the ADC.
The ADC is also connected internal to a temp sensor, which can also be
read via this method.
The (only) MUX values expected to be used are:
1 Internal 1V25 reference
16 BlueCore01b pin Test_A; BlueCore2-External pin AIO0
17 BlueCore01b pin Test_B; BlueCore2-External pin AIO1
36 Chip’s internal temperature (change) sensor. BlueCore2-ROM and later only.
The MUX can also select other (undocumented) test points.
Example usage
--
$ ./bccmd -t HCI -d hci1 adc 17
ADC value from Mux 0x11 : 0x0054 (valid)
$ ./bccmd -t HCI -d hci1 adc 1
ADC value from Mux 0x01 : 0x00b2 (valid)
---
tools/bccmd.c | 43 +++++++++++++++++++++++++++++++++++++++++++
tools/csr.h | 2 ++
2 files changed, 45 insertions(+)
diff --git a/tools/bccmd.c b/tools/bccmd.c
index 7cce426..4d15f3f 100644
--- a/tools/bccmd.c
+++ b/tools/bccmd.c
@@ -30,6 +30,7 @@
#include <stdlib.h>
#include <getopt.h>
#include <sys/socket.h>
+#include <unistd.h>
#include "lib/bluetooth.h"
#include "lib/hci.h"
@@ -1040,6 +1041,47 @@ static int cmd_pscheck(int transport, int argc, char *argv[])
return 0;
}
+static int cmd_adc(int transport, int argc, char *argv[])
+{
+ uint8_t array[8];
+ uint16_t mux, value;
+ int err;
+
+ OPT_HELP(1, NULL);
+
+ if (!strncasecmp(argv[0], "0x", 2))
+ mux = strtol(argv[0], NULL, 16);
+ else
+ mux = atoi(argv[0]);
+
+ /* Request an ADC read from a particular mux'ed input */
+ memset(array, 0, sizeof(array));
+ array[0] = mux & 0xff;
+ array[1] = mux >> 8;
+
+ err = transport_write(transport, CSR_VARID_ADC, array, 2);
+ if (err < 0) {
+ errno = -err;
+ return -1;
+ }
+
+ /* have to wait a short while, then read result */
+ usleep(50000);
+ err = transport_read(transport, CSR_VARID_ADC_RES, array, 8);
+ if (err < 0) {
+ errno = -err;
+ return -1;
+ }
+
+ mux = array[0] | (array[1] << 8);
+ value = array[4] | (array[5] << 8);
+
+ printf("ADC value from Mux 0x%02x : 0x%04x (%s)\n", mux, value,
+ array[2] == 1 ? "valid" : "invalid");
+
+ return 0;
+}
+
static struct {
char *str;
int (*func)(int transport, int argc, char *argv[]);
@@ -1070,6 +1112,7 @@ static struct {
{ "psread", cmd_psread, NULL, "Read all PS keys" },
{ "psload", cmd_psload, "<file>", "Load all PS keys from PSR file" },
{ "pscheck", cmd_pscheck, "<file>", "Check PSR file" },
+ { "adc", cmd_adc, "<mux>", "Read ADC value of <mux> input" },
{ NULL }
};
diff --git a/tools/csr.h b/tools/csr.h
index 8b94d7b..cc245a5 100644
--- a/tools/csr.h
+++ b/tools/csr.h
@@ -39,6 +39,7 @@
#define CSR_VARID_BT_CLOCK 0x2c00 /* uint32 */
#define CSR_VARID_PS_NEXT 0x3005 /* complex */
#define CSR_VARID_PS_SIZE 0x3006 /* complex */
+#define CSR_VARID_ADC_RES 0x3007 /* complex */
#define CSR_VARID_CRYPT_KEY_LENGTH 0x3008 /* complex */
#define CSR_VARID_PICONET_INSTANCE 0x3009 /* complex */
#define CSR_VARID_GET_CLR_EVT 0x300a /* complex */
@@ -62,6 +63,7 @@
#define CSR_VARID_CANCEL_PAGE 0x4012 /* valueless */
#define CSR_VARID_PS_CLR 0x4818 /* uint16 */
#define CSR_VARID_MAP_SCO_PCM 0x481c /* uint16 */
+#define CSR_VARID_ADC 0x4829 /* uint16 */
#define CSR_VARID_SINGLE_CHAN 0x482e /* uint16 */
#define CSR_VARID_RADIOTEST 0x5004 /* complex */
#define CSR_VARID_PS_CLR_STORES 0x500c /* complex */
--
2.1.4
--
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