Get tc_cdiv working (presumably, need to check on the oscilloscope)

Add adc code to read the field strength


git-svn-id: https://svn.openpcd.org:2342/trunk@325 6dc7ffe9-61d6-0310-9af1-9938baff3ed1

6 files changed, 74 insertions, 13 deletions

diff --git a/openpicc/application/adc.c b/openpicc/application/adc.c
new file mode 100644
index 0000000..4aa900e
--- /dev/null
+++ b/openpicc/application/adc.c
@@ -0,0 +1,45 @@
+/* AT91 ADC for OpenPICC
+ * (C) 2007 Henryk Plötz <henryk@ploetzli.ch> 
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by 
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+
+#include "openpicc.h"
+#include "board.h"
+
+#include <sys/types.h>
+#include <lib_AT91SAM7.h>
+
+static AT91S_ADC* adc = AT91C_BASE_ADC;
+
+int adc_get_field_strength(void)
+{
+	adc->ADC_CR = AT91C_ADC_START;
+	while( (adc->ADC_SR & AT91C_ADC_EOC4)==0) ;
+	return adc->ADC_CDR4;
+}
+
+void adc_init(void)
+{
+	// PRESCAL = 4 -> ADC clock = MCLK / 10 = 4.8 MHz (max is 5 MHz at 10 bit)
+	// Start time <20 us -> STARTUP=11
+	// Track and hold time >600 ns -> SHTIM=2
+	adc->ADC_MR = AT91C_ADC_TRGEN_DIS | AT91C_ADC_LOWRES_10_BIT | 
+		AT91C_ADC_SLEEP_MODE | (4 << 8) | (11 << 16) | (2 << 24);
+	adc->ADC_IDR = 0xfffff;
+	adc->ADC_CHER = OPENPICC_ADC_FIELD_STRENGTH;
+}
diff --git a/openpicc/application/adc.h b/openpicc/application/adc.h
new file mode 100644
index 0000000..751055f
--- /dev/null
+++ b/openpicc/application/adc.h
@@ -0,0 +1,7 @@
+#ifndef _ADC_H
+#define _ADC_H
+
+extern int adc_get_field_strength(void);
+extern void adc_init(void);
+
+#endif
diff --git a/openpicc/application/cmd.c b/openpicc/application/cmd.c
index d7ce784..e6b8947 100644
--- a/openpicc/application/cmd.c
+++ b/openpicc/application/cmd.c
@@ -11,6 +11,8 @@
 #include "openpicc.h"
 #include "led.h"
 #include "da.h"
+#include "adc.h"
+#include "tc_cdiv.h"
 #include "tc_cdiv_sync.h"
 #include "pio_irq.h"
 
@@ -230,6 +232,9 @@ void prvExecCommand(u_int32_t cmd, portCHAR *args) {
 		    i = pio_irq_get_count() & (~(unsigned int)0);
 		    DumpUIntToUSB(i);
 		    DumpStringToUSB("\n\r");
+		    DumpStringToUSB(" * current field strength: ");
+		    DumpUIntToUSB(adc_get_field_strength());
+		    DumpStringToUSB("\n\r");
 		    DumpStringToUSB(
 			" *\n\r"
 			" *****************************************************\n\r"
diff --git a/openpicc/application/main.c b/openpicc/application/main.c
index 8f950ab..8d0070d 100644
--- a/openpicc/application/main.c
+++ b/openpicc/application/main.c
@@ -39,9 +39,11 @@
 #include "env.h"
 #include "cmd.h"
 #include "da.h"
+#include "adc.h"
 #include "pll.h"
 #include "pio_irq.h"
 #include "ssc_picc.h"
+#include "tc_cdiv.h"
 #include "tc_cdiv_sync.h"
 
 /**********************************************************************/
@@ -85,16 +87,18 @@ int main (void)
     
     pio_irq_init();
     
-    tc_cdiv_sync_init();
-    ssc_tx_init();
-    //ssc_rx_init();
-
     vLedInit();
     
     da_init();
+    adc_init();
     
     pll_init();
     
+    tc_cdiv_init();
+    tc_cdiv_sync_init();
+    ssc_tx_init();
+    //ssc_rx_init();
+
     xTaskCreate (vUSBCDCTask, (signed portCHAR *) "USB", TASK_USB_STACK,
 	NULL, TASK_USB_PRIORITY, NULL);
 	
diff --git a/openpicc/application/tc_cdiv.c b/openpicc/application/tc_cdiv.c
index 6f06ba5..638586d 100644
--- a/openpicc/application/tc_cdiv.c
+++ b/openpicc/application/tc_cdiv.c
@@ -23,12 +23,12 @@
 
 #include <lib_AT91SAM7.h>
 #include <AT91SAM7.h>
-#include <os/dbgu.h>
+#include "dbgu.h"
 
-#include "../openpcd.h"
-#include <os/tc_cdiv.h>
+#include "openpicc.h"
+#include "tc_cdiv.h"
 
-static AT91PS_TCB tcb = AT91C_BASE_TCB;
+AT91PS_TCB tcb = AT91C_BASE_TCB;
 
 /* set carrier divider to a specific */
 void tc_cdiv_set_divider(u_int16_t div)
@@ -56,10 +56,10 @@ void tc_cdiv_init(void)
 {
 	/* Cfg PA28(TCLK1), PA0(TIOA0), PA1(TIOB0), PA20(TCLK2) as Periph B */
 	AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, 
-			    OPENPCD_PIO_CARRIER_IN |
-			    OPENPCD_PIO_CARRIER_DIV_OUT |
-			    OPENPCD_PIO_CDIV_HELP_OUT |
-			    OPENPCD_PIO_CDIV_HELP_IN);
+			    OPENPICC_PIO_CARRIER_IN |
+			    OPENPICC_PIO_CARRIER_DIV_OUT |
+			    OPENPICC_PIO_CDIV_HELP_OUT |
+			    OPENPICC_PIO_CDIV_HELP_IN);
 
 	AT91F_PMC_EnablePeriphClock(AT91C_BASE_PMC, 
 				    ((unsigned int) 1 << AT91C_ID_TC0));
diff --git a/openpicc/application/tc_cdiv.h b/openpicc/application/tc_cdiv.h
index d5744f9..33ff5b9 100644
--- a/openpicc/application/tc_cdiv.h
+++ b/openpicc/application/tc_cdiv.h
@@ -5,7 +5,7 @@
 #include <sys/types.h>
 #include <lib_AT91SAM7.h>
 
-static AT91PS_TCB tcb;
+extern AT91PS_TCB tcb;
 
 extern void tc_cdiv_phase_add(int16_t inc);
 extern void tc_cdiv_set_divider(u_int16_t div);