From 8697e9aa352429b976ab4f5eca7326b676e04d92 Mon Sep 17 00:00:00 2001
From: cnlohr <lohr85@gmail.com>
Date: Wed, 13 Sep 2023 03:45:14 -0400
Subject: [PATCH] Move touch to header.
---
examples/cap_touch_adc/cap_touch_adc.c | 123 +--------------------
extralibs/ch32v003_touch.h | 147 +++++++++++++++++++++++++
2 files changed, 148 insertions(+), 122 deletions(-)
create mode 100644 extralibs/ch32v003_touch.h
diff --git a/examples/cap_touch_adc/cap_touch_adc.c b/examples/cap_touch_adc/cap_touch_adc.c
index 2bde0c9..98457e9 100644
--- a/examples/cap_touch_adc/cap_touch_adc.c
+++ b/examples/cap_touch_adc/cap_touch_adc.c
@@ -21,101 +21,7 @@
#include "ch32v003fun.h"
#include <stdio.h>
-#define ADC_SAMPLE_TIME 2 // Tricky: Don't change this without a lot of experimentation.
-#define MAX_SCALECHECK 4
-
-// Can either be 0 or 1.
-// If 0: Measurement low and rises high. So more pressed is smaller number.
-// If 1: Higher number = harder press. Good to pair with TOUCH_FLAT.
-// If you are doing more prox, use mode 0, otherwise, use mode 1.
-#define TOUCH_SLOPE 1
-
-// If you set this to 1, it will glitch the line, so it will only read
-// anything reasonable if the capacitance can overcome that initial spike.
-// Typically, it seems if you use this you probbly don't need to do
-// any pre-use calibration.
-#define TOUCH_FLAT 0
-
-void InitTouchADC( )
-{
- // ADCCLK = 24 MHz => RCC_ADCPRE = 0: divide sys clock by 2
- RCC->CFGR0 &= ~(0x1F<<11);
-
- // Set up single conversion on chl 2
- ADC1->RSQR1 = 0;
- ADC1->RSQR2 = 0;
-
- // turn on ADC and set rule group to sw trig
- ADC1->CTLR2 |= ADC_ADON | ADC_EXTSEL;
-
- // Reset calibration
- ADC1->CTLR2 |= ADC_RSTCAL;
- while(ADC1->CTLR2 & ADC_RSTCAL);
-
- // Calibrate
- ADC1->CTLR2 |= ADC_CAL;
- while(ADC1->CTLR2 & ADC_CAL);
-}
-
-// Run from RAM to get even more stable timing.
-// This function call takes about 8.1uS to execute.
-uint32_t ReadTouchPin( GPIO_TypeDef * io, int portpin, int adcno, int iterations ) __attribute__((noinline, section(".srodata")));
-uint32_t ReadTouchPin( GPIO_TypeDef * io, int portpin, int adcno, int iterations )
-{
- uint32_t ret = 0;
-
- ADC1->RSQR3 = adcno;
- ADC1->SAMPTR2 = ADC_SAMPLE_TIME<<(3*adcno);
-
- uint32_t CFGBASE = io->CFGLR & (~(0xf<<(4*portpin)));
- uint32_t CFGFLOAT = ((GPIO_CFGLR_IN_PUPD)<<(4*portpin)) | CFGBASE;
- uint32_t CFGDRIVE = (GPIO_CFGLR_OUT_2Mhz_PP)<<(4*portpin) | CFGBASE;
-
- // If we run multiple times with slightly different wait times, we can
- // reduce the impact of the ADC's DNL.
-
-
-#if TOUCH_FLAT == 1
-#define RELEASEIO io->OUTDR = 1<<(portpin+16*TOUCH_SLOPE); io->CFGLR = CFGFLOAT;
-#else
-#define RELEASEIO io->CFGLR = CFGFLOAT; io->OUTDR = 1<<(portpin+16*TOUCH_SLOPE);
-#endif
-
-#define INNER_LOOP( n ) \
- { \
- /* Only lock IRQ for a very narrow window. */ \
- __disable_irq(); \
- \
- /* Tricky - we start the ADC BEFORE we transition the pin. By doing \
- this We are catching it onthe slope much more effectively. */ \
- ADC1->CTLR2 = ADC_SWSTART | ADC_ADON | ADC_EXTSEL; \
- \
- ADD_N_NOPS( n ) \
- \
- RELEASEIO \
- \
- /* Sampling actually starts here, somewhere, so we can let other \
- interrupts run */ \
- __enable_irq(); \
- while(!(ADC1->STATR & ADC_EOC)); \
- io->CFGLR = CFGDRIVE; \
- io->OUTDR = 1<<(portpin+(16*(1-TOUCH_SLOPE))); \
- ret += ADC1->RDATAR; \
- }
-
- int i;
- for( i = 0; i < iterations; i++ )
- {
- // Wait a variable amount of time based on loop iteration, in order
- // to get a variety of RC points and minimize DNL.
-
- INNER_LOOP( 0 );
- INNER_LOOP( 2 );
- INNER_LOOP( 4 );
- }
-
- return ret;
-}
+#include "ch32v003_touch.h"
int main()
{
@@ -133,8 +39,6 @@ int main()
{
uint32_t sum[8] = { 0 };
- int j;
-
uint32_t start = SysTick->CNT;
// Sampling all touch pads, 3x should take 6030 cycles, and runs at about 8kHz
@@ -156,28 +60,3 @@ int main()
}
}
-/*
- * MIT License
- *
- * Copyright (c) 2023 Valve Corporation
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-
diff --git a/extralibs/ch32v003_touch.h b/extralibs/ch32v003_touch.h
new file mode 100644
index 0000000..b0c3e90
--- /dev/null
+++ b/extralibs/ch32v003_touch.h
@@ -0,0 +1,147 @@
+#ifndef _CH32V003_TOUCH_H
+#define _CH32V003_TOUCH_H
+
+/** ADC-based Capactive Touch Control.
+
+ see cap_touch_adc.c for an example.
+
+ // Enable GPIOD, C and ADC
+ RCC->APB2PCENR |= RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOC | RCC_APB2Periph_ADC1;
+ InitTouchADC();
+
+
+ // Then do this any time you want to read some touches.
+ sum[0] += ReadTouchPin( GPIOA, 2, 0, iterations );
+ sum[1] += ReadTouchPin( GPIOA, 1, 1, iterations );
+ sum[2] += ReadTouchPin( GPIOC, 4, 2, iterations );
+ sum[3] += ReadTouchPin( GPIOD, 2, 3, iterations );
+ sum[4] += ReadTouchPin( GPIOD, 3, 4, iterations );
+ sum[5] += ReadTouchPin( GPIOD, 5, 5, iterations );
+ sum[6] += ReadTouchPin( GPIOD, 6, 6, iterations );
+ sum[7] += ReadTouchPin( GPIOD, 4, 7, iterations );
+*/
+
+
+
+#define TOUCH_ADC_SAMPLE_TIME 2 // Tricky: Don't change this without a lot of experimentation.
+
+// Can either be 0 or 1.
+// If 0: Measurement low and rises high. So more pressed is smaller number.
+// If 1: Higher number = harder press. Good to pair with TOUCH_FLAT.
+// If you are doing more prox, use mode 0, otherwise, use mode 1.
+#define TOUCH_SLOPE 1
+
+// If you set this to 1, it will glitch the line, so it will only read
+// anything reasonable if the capacitance can overcome that initial spike.
+// Typically, it seems if you use this you probbly don't need to do
+// any pre-use calibration.
+#define TOUCH_FLAT 0
+
+static void InitTouchADC( );
+void InitTouchADC( )
+{
+ // ADCCLK = 24 MHz => RCC_ADCPRE = 0: divide sys clock by 2
+ RCC->CFGR0 &= ~(0x1F<<11);
+
+ // Set up single conversion on chl 2
+ ADC1->RSQR1 = 0;
+ ADC1->RSQR2 = 0;
+
+ // turn on ADC and set rule group to sw trig
+ ADC1->CTLR2 |= ADC_ADON | ADC_EXTSEL;
+
+ // Reset calibration
+ ADC1->CTLR2 |= ADC_RSTCAL;
+ while(ADC1->CTLR2 & ADC_RSTCAL);
+
+ // Calibrate
+ ADC1->CTLR2 |= ADC_CAL;
+ while(ADC1->CTLR2 & ADC_CAL);
+}
+
+// Run from RAM to get even more stable timing.
+// This function call takes about 8.1uS to execute.
+static uint32_t ReadTouchPin( GPIO_TypeDef * io, int portpin, int adcno, int iterations ) __attribute__((noinline, section(".srodata")));
+uint32_t ReadTouchPin( GPIO_TypeDef * io, int portpin, int adcno, int iterations )
+{
+ uint32_t ret = 0;
+
+ ADC1->RSQR3 = adcno;
+ ADC1->SAMPTR2 = TOUCH_ADC_SAMPLE_TIME<<(3*adcno);
+
+ uint32_t CFGBASE = io->CFGLR & (~(0xf<<(4*portpin)));
+ uint32_t CFGFLOAT = ((GPIO_CFGLR_IN_PUPD)<<(4*portpin)) | CFGBASE;
+ uint32_t CFGDRIVE = (GPIO_CFGLR_OUT_2Mhz_PP)<<(4*portpin) | CFGBASE;
+
+ // If we run multiple times with slightly different wait times, we can
+ // reduce the impact of the ADC's DNL.
+
+
+#if TOUCH_FLAT == 1
+#define RELEASEIO io->OUTDR = 1<<(portpin+16*TOUCH_SLOPE); io->CFGLR = CFGFLOAT;
+#else
+#define RELEASEIO io->CFGLR = CFGFLOAT; io->OUTDR = 1<<(portpin+16*TOUCH_SLOPE);
+#endif
+
+#define INNER_LOOP( n ) \
+ { \
+ /* Only lock IRQ for a very narrow window. */ \
+ __disable_irq(); \
+ \
+ /* Tricky - we start the ADC BEFORE we transition the pin. By doing \
+ this We are catching it onthe slope much more effectively. */ \
+ ADC1->CTLR2 = ADC_SWSTART | ADC_ADON | ADC_EXTSEL; \
+ \
+ ADD_N_NOPS( n ) \
+ \
+ RELEASEIO \
+ \
+ /* Sampling actually starts here, somewhere, so we can let other \
+ interrupts run */ \
+ __enable_irq(); \
+ while(!(ADC1->STATR & ADC_EOC)); \
+ io->CFGLR = CFGDRIVE; \
+ io->OUTDR = 1<<(portpin+(16*(1-TOUCH_SLOPE))); \
+ ret += ADC1->RDATAR; \
+ }
+
+ int i;
+ for( i = 0; i < iterations; i++ )
+ {
+ // Wait a variable amount of time based on loop iteration, in order
+ // to get a variety of RC points and minimize DNL.
+
+ INNER_LOOP( 0 );
+ INNER_LOOP( 2 );
+ INNER_LOOP( 4 );
+ }
+
+ return ret;
+}
+
+#endif
+
+/*
+ * MIT License
+ *
+ * Copyright (c) 2023 Valve Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
--
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