From: simon@mungewell.org
To: linux-bluetooth@vger.kernel.org
Subject: [Patch] bccmd - add ability to read ADC
Date: Wed, 27 May 2015 11:32:40 -0400 [thread overview]
Message-ID: <53e48edc3040ae4a82e3beaf06c692e1.squirrel@mungewell.org> (raw)
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Hi,
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)
--
Enjoy,
Simon.
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[-- Type: text/x-patch; name="bccmd_adc.patch", Size: 2465 bytes --]
diff --git a/tools/bccmd.c b/tools/bccmd.c
index 7cce426..64c5f56 100644
--- a/tools/bccmd.c
+++ b/tools/bccmd.c
@@ -1040,6 +1040,47 @@ 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;
+ }
+
+ // sleep, 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 +1111,7 @@ 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 */
next reply other threads:[~2015-05-27 15:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-27 15:32 simon [this message]
2015-06-06 5:49 ` [Patch] bccmd - add ability to read ADC Marcel Holtmann
2015-06-08 18:04 ` [PATCH] " Simon Wood
2015-06-17 12:48 ` Johan Hedberg
2015-06-17 15:16 ` simon
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