Diff: main.cpp

Revision:

0:6cc44b2a3d49

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jun 01 00:05:21 2016 +0000
@@ -0,0 +1,70 @@
+// capacitive touch  TSC
+// select cap pin and sensor pin in same group  datasheet table 17
+//  http://www.codeforge.com/read/253659/bsp.c__html
+
+#include "mbed.h"
+#include "PeripheralPins.h"
+TSC_HandleTypeDef TscHandle;
+const PinMap PinMap_TSC[] = {
+    {PB_6,  (int)TSC, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, 9)},  // AF9 OUTPUT or AF?
+    {PB_7,  (int)TSC, STM_PIN_DATA(STM_MODE_AF_OD, GPIO_NOPULL, 9)},  // need capacitor
+    {NC,    NC,    0}
+};
+
+#define PRREG(z) printf(#z" 0x%x\n",z)
+Timer tmr;
+
+main() {
+    tmr.start();
+    __HAL_RCC_TSC_CLK_ENABLE();   // enable TSC
+    // enable GPIO and config pins 
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    //HAL_GPIO_Init();   // mux function 9
+    pin_function(PB_6,pinmap_find_function(PB_6,PinMap_TSC));
+    pin_function(PB_7,pinmap_find_function(PB_7,PinMap_TSC));
+
+  TscHandle.Instance = TSC;
+  TscHandle.Init.AcquisitionMode         = TSC_ACQ_MODE_NORMAL;
+  TscHandle.Init.CTPulseHighLength       = TSC_CTPH_2CYCLES;
+  TscHandle.Init.CTPulseLowLength        = TSC_CTPL_2CYCLES; 
+  TscHandle.Init.IODefaultMode           = TSC_IODEF_IN_FLOAT;
+  TscHandle.Init.MaxCountInterrupt       = DISABLE;
+  TscHandle.Init.MaxCountValue           = TSC_MCV_8191;
+  TscHandle.Init.PulseGeneratorPrescaler = TSC_PG_PRESC_DIV32; 
+  TscHandle.Init.SpreadSpectrum          = DISABLE;
+  TscHandle.Init.SpreadSpectrumDeviation = 127;
+  TscHandle.Init.SpreadSpectrumPrescaler = TSC_SS_PRESC_DIV1;
+  TscHandle.Init.SynchroPinPolarity      = TSC_SYNC_POL_FALL;
+  /* All channel, shield and sampling IOs must be declared below */
+  TscHandle.Init.ChannelIOs              =  TSC_GROUP2_IO3;   // PB6  output push-pull sensor 
+  TscHandle.Init.SamplingIOs             =  TSC_GROUP2_IO4;   // PB7  output open drain  need capacitor
+  TscHandle.Init.ShieldIOs               = 0;
+  HAL_TSC_Init(&TscHandle);
+  PRREG(GPIOB->MODER);
+  PRREG(GPIOB->OTYPER);
+  PRREG(GPIOB->PUPDR); 
+  PRREG(GPIOB->AFR[0]); 
+  PRREG(GPIOB->AFR[1]);
+  PRREG(TSC->CR); 
+  PRREG(TSC->IOASCR);
+  PRREG(TSC->IOSCR);
+  PRREG(TSC->IOCCR);
+  
+  while(1) {
+    uint32_t us = tmr.read_us();    
+    HAL_TSC_Start(&TscHandle);
+    HAL_TSC_PollForAcquisition(&TscHandle);
+    uint32_t val = HAL_TSC_GroupGetValue(&TscHandle,1);  // group 2  0 to 7 or 1 to 8
+    us=tmr.read_us() - us;
+    int avrg=0;
+    for(int i=0;i<100;i++) {
+        HAL_TSC_Start(&TscHandle);
+        HAL_TSC_PollForAcquisition(&TscHandle);
+        avrg += HAL_TSC_GroupGetValue(&TscHandle,1); 
+    }
+    printf("%d  %d us   avrg %d\n",val,us,avrg/100);
+    PRREG(TSC->IOGCSR);
+    wait(2.0);
+  }
+  
+}
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