From efaeb6d19f1199aa30304ac42beb199dcb016ccd Mon Sep 17 00:00:00 2001
From: Monideep Bora <monideep.bora@infineon.com>
Date: Fri, 28 Apr 2023 10:46:41 +0200
Subject: [PATCH] diff gain working

---
 cores/wiring_analog.c | 50 +++++++++++++++++++++++++++++++++++++++++++
 cores/wiring_analog.h |  2 ++
 keywords.txt          |  1 +
 3 files changed, 53 insertions(+)

diff --git a/cores/wiring_analog.c b/cores/wiring_analog.c
index 5fc4b102..11ffe9d9 100644
--- a/cores/wiring_analog.c
+++ b/cores/wiring_analog.c
@@ -216,6 +216,56 @@ if( channel < NUM_ANALOG_INPUTS )
 return value;
 }
 
+uint32_t analogRead_special( uint8_t channel )
+{
+uint32_t value;
+
+value = 0xFFFFFFFF;
+if( channel < NUM_ANALOG_INPUTS )
+  {
+  XMC_ADC_t *adc = &mapping_adc[ channel ];
+
+#if(XMC_VADC_GROUP_AVAILABLE == 1U)
+  // ADC grouping
+  if( !(adc->enabled) )
+    {
+    XMC_VADC_CHANNEL_CONFIG_t  vadc_gobal_channel_config;
+    memset( &vadc_gobal_channel_config, 0, sizeof( XMC_VADC_CHANNEL_CONFIG_t ) );
+    vadc_gobal_channel_config.input_class       = XMC_VADC_CHANNEL_CONV_GROUP_CLASS1;
+    vadc_gobal_channel_config.result_reg_number = adc->result_reg_num;
+    vadc_gobal_channel_config.alias_channel     = XMC_VADC_CHANNEL_ALIAS_DISABLED;
+
+    XMC_VADC_RESULT_CONFIG_t vadc_gobal_result_config = { .g_rcr = 0 };
+    /* Configure a channel belonging to the aforesaid conversion kernel */
+    XMC_VADC_GROUP_ChannelInit( adc->group, adc->channel_num, &vadc_gobal_channel_config );
+    /* Configure a result resource belonging to the aforesaid conversion kernel */
+    XMC_VADC_GROUP_ResultInit( adc->group, adc->result_reg_num, &vadc_gobal_result_config );
+    /* Add channel into the Background Request Source Channel Select Register */
+    XMC_VADC_GLOBAL_BackgroundAddChannelToSequence( VADC, (uint32_t)adc->group_num,
+                                                          (uint32_t)adc->channel_num );                                                         
+
+    XMC_VADC_GLOBAL_SHS_SetGainFactor(SHS0,3,XMC_VADC_GROUP_INDEX_0,(uint32_t)adc->channel_num);                                                          
+    }
+  /* Start conversion manually using load event trigger*/
+  XMC_VADC_GLOBAL_BackgroundTriggerConversion( VADC );
+  value = XMC_VADC_GROUP_GetResult( adc->group, adc->result_reg_num );
+#else
+  // XMC1100 no ADC grouping
+  if( !(adc->enabled) )
+    /* Add a channel to the background source. */
+    VADC->BRSSEL[ ADC_CONVERSION_GROUP ] = (uint32_t)( 1U << adc->channel_num );
+    XMC_VADC_GLOBAL_SHS_SetGainFactor(SHS0,1,XMC_VADC_GROUP_INDEX_0,(uint32_t)adc->channel_num);   
+  // Generates conversion request
+  XMC_VADC_GLOBAL_BackgroundTriggerConversion( VADC );
+
+  // Wait until conversion is ready
+  while( ( ( value = XMC_VADC_GLOBAL_GetDetailedResult( VADC ) ) & VADC_GLOBRES_VF_Msk) == 0u );
+#endif
+  value = ( ( value & VADC_GLOBRES_RESULT_Msk) >> ( ADC_MAX_READ_RESOLUTION - _readResolution ) );
+  }
+return value;
+}
+
 
 /* Helper function for analogWrite and setAnalogWriteFrequency to scan
    mapping tables to determine for a given pin which PWM4, PWM8 or DAC
diff --git a/cores/wiring_analog.h b/cores/wiring_analog.h
index 3da40ccc..3032429d 100644
--- a/cores/wiring_analog.h
+++ b/cores/wiring_analog.h
@@ -85,6 +85,8 @@ extern "C" {
      */
     extern uint32_t analogRead( uint8_t channel ) ;
 
+    extern uint32_t analogRead_special( uint8_t channel ) ;
+
     /*
      * \brief Set the resolution of analogRead return values in number of bits.
      * \note Default is 10 bits (range from 0 to 1023).
diff --git a/keywords.txt b/keywords.txt
index 4a2f3bb9..04c1762b 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -16,6 +16,7 @@ getAnalogReadBits	KEYWORD2
 getAnalogWriteBits	KEYWORD2
 getAnalogReadMaximum	KEYWORD2
 getAnalogWriteMaximum	KEYWORD2
+analogRead_special      KEYWORD2
 
 #######################################
 # Instances (KEYWORD2)