void Adafruit_STMPE610::writeRegister8(uint8_t reg, uint8_t val) {
spi_begin();
CSLow();
spiOut(reg);
spiOut(val);
CSHigh();
spi_end();
}
boolean Adafruit_STMPE610::begin() {
// hardware SPI
InitTransaction();
// SPI = mraa_spi_init(0); // which buss? will experment here...
SPI = mraa_spi_init_software_cs(0); // which buss? will experment here...
mraa_spi_frequency(SPI, 1000000);
mraa_spi_lsbmode(SPI, false);
mraa_spi_mode(SPI, MRAA_SPI_MODE0);
m_spiMode = MRAA_SPI_MODE0;
_gpioCS = mraa_gpio_init(_cs);
mraa_gpio_dir(_gpioCS, MRAA_GPIO_OUT);
CSHigh();
mraa_spi_write(SPI, 0x00);
// try mode0
if (getVersion() != 0x811) {
//Serial.println("try MODE1");
mraa_spi_frequency(SPI, 1000000);
mraa_spi_lsbmode(SPI, false);
mraa_spi_mode(SPI, MRAA_SPI_MODE1);
m_spiMode = MRAA_SPI_MODE1;
if (getVersion() != 0x811) {
return false;
}
}
writeRegister8(STMPE_SYS_CTRL1, STMPE_SYS_CTRL1_RESET);
delay(10);
for (uint8_t i=0; i<65; i++) {
readRegister8(i);
}
writeRegister8(STMPE_SYS_CTRL2, 0x0); // turn on clocks!
writeRegister8(STMPE_TSC_CTRL, STMPE_TSC_CTRL_XYZ | STMPE_TSC_CTRL_EN); // XYZ and enable!
//Serial.println(readRegister8(STMPE_TSC_CTRL), HEX);
writeRegister8(STMPE_INT_EN, STMPE_INT_EN_TOUCHDET);
writeRegister8(STMPE_ADC_CTRL1, STMPE_ADC_CTRL1_10BIT | (0x6 << 4)); // 96 clocks per conversion
writeRegister8(STMPE_ADC_CTRL2, STMPE_ADC_CTRL2_6_5MHZ);
writeRegister8(STMPE_TSC_CFG, STMPE_TSC_CFG_4SAMPLE | STMPE_TSC_CFG_DELAY_1MS | STMPE_TSC_CFG_SETTLE_5MS);
writeRegister8(STMPE_TSC_FRACTION_Z, 0x6);
writeRegister8(STMPE_FIFO_TH, 1);
writeRegister8(STMPE_FIFO_STA, STMPE_FIFO_STA_RESET);
writeRegister8(STMPE_FIFO_STA, 0); // unreset
writeRegister8(STMPE_TSC_I_DRIVE, STMPE_TSC_I_DRIVE_50MA);
writeRegister8(STMPE_INT_STA, 0xFF); // reset all ints
writeRegister8(STMPE_INT_CTRL, STMPE_INT_CTRL_POL_HIGH | STMPE_INT_CTRL_ENABLE);
return true;
}
uint8_t Adafruit_STMPE610::readRegister8(uint8_t reg) {
uint8_t x ;
spi_begin();
CSLow();
spiOut(0x80 | reg);
spiOut(0x00);
x = spiIn();
CSHigh();
spi_end();
return x;
}
static void Write(int fCmd, uchar b)
{
/* (RW starts low, E starts low, CS# starts high) */
fCmd ? DCLow() : DCHigh(); // set data bit for command or data
SetData(b);
EHigh();
CSLow();
asm("nop"); // hold state for >= 60ns (1 instruction = 125ns for 8MHz uC)
CSHigh();
ELow();
}
uint16_t Adafruit_STMPE610::readRegister16(uint8_t reg) {
uint16_t x;
spi_begin();
CSLow();
spiOut(0x80 | reg);
spiOut(0x00);
x = spiIn();
x<<=8;
x |= spiIn();
CSHigh();
spi_end();
//Serial.print("$"); Serial.print(reg, HEX);
//Serial.print(": 0x"); Serial.println(x, HEX);
return x;
}
static void SetControlState()
{
ELow(); // not enabled
CSHigh(); // not selected
RWLow(); // write by default
}
