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Use beginTransaction for spi, since it's surprisingly less additional memory than the setClockDivider call. Also, add SPI cleanup to early return case

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This commit is contained in:
Reed Nightingale 2020-04-21 21:06:19 -07:00
parent 1e66731649
commit f113551aa6
2 changed files with 12 additions and 7 deletions
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0
ubitx.h → pin_definitions.h
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19
touch.cpp
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@ -2,7 +2,8 @@
#include <SPI.h>
#include "ubitx.h"//pin assignments
#include "pin_definitions.h"
#include "settings.h"
constexpr int16_t Z_THRESHOLD = 400;
constexpr uint8_t MSEC_THRESHOLD = 3;
@ -11,6 +12,8 @@ uint32_t msraw=0x80000000;
int16_t xraw=0, yraw=0, zraw=0;
constexpr uint8_t rotation = 1;
SPISettings spiSettingsTouch(2000000,MSBFIRST,SPI_MODE0);
int16_t touch_besttwoavg( int16_t x , int16_t y , int16_t z ) {
int16_t da, db, dc;
int16_t reta = 0;
@ -31,8 +34,8 @@ void touch_update(){
uint32_t now = millis();
if (now - msraw < MSEC_THRESHOLD) return;
SPI.setClockDivider(SPI_CLOCK_DIV8);//2MHz
digitalWrite(CS_PIN, LOW);
SPI.beginTransaction(spiSettingsTouch);
digitalWrite(PIN_TOUCH_CS, LOW);
SPI.transfer(0xB1 /* Z1 */);
int16_t z1 = SPI.transfer16(0xC1 /* Z2 */) >> 3;
int z = z1 + 4095;
@ -42,6 +45,8 @@ void touch_update(){
if (z < Z_THRESHOLD) { // if ( !touched ) {
// Serial.println();
zraw = 0;
digitalWrite(PIN_TOUCH_CS, HIGH);
SPI.endTransaction();
return;
}
zraw = z;
@ -53,8 +58,8 @@ void touch_update(){
data[3] = SPI.transfer16(0x91 /* X */) >> 3;
data[4] = SPI.transfer16(0xD0 /* Y */) >> 3; // Last Y touch power down
data[5] = SPI.transfer16(0) >> 3;
digitalWrite(CS_PIN, HIGH);
SPI.setClockDivider(SPI_CLOCK_DIV2);//Return to full speed for TFT
digitalWrite(PIN_TOUCH_CS, HIGH);
SPI.endTransaction();
int16_t x = touch_besttwoavg( data[0], data[2], data[4] );
int16_t y = touch_besttwoavg( data[1], data[3], data[5] );
@ -82,8 +87,8 @@ void touch_update(){
}
void initTouch(){
pinMode(CS_PIN, OUTPUT);
digitalWrite(CS_PIN, HIGH);
pinMode(PIN_TOUCH_CS, OUTPUT);
digitalWrite(PIN_TOUCH_CS, HIGH);
}
bool readTouch(Point *const touch_point_out){