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STMPE811: attempt to use FIFO 

Very early version of using FIFO threshold interrupt.
ugfx_release_2.6
Mateusz Tomaszkiewicz 2013-03-29 01:15:07 +01:00
parent 2a00dd667d
commit 2f7b6fc80b
4 changed files with 49 additions and 23 deletions
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55
drivers/ginput/touch/STMPE811/ginput_lld_mouse.c
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@ -69,19 +69,19 @@ void ginput_lld_mouse_init(void)
chThdSleepMilliseconds(10);
write_reg(STMPE811_REG_SYS_CTRL2, 1, 0x0C); // Temperature sensor clock off, GPIO clock off, touch clock on, ADC clock on
write_reg(STMPE811_REG_INT_EN, 1, 0x01); // Interrupt on INT pin when FIFO is equal or above threshold value OR touch is detected
write_reg(STMPE811_REG_ADC_CTRL1, 1, 0x48); // ADC conversion time = 80 clock ticks, 12-bit ADC, internaal voltage refernce
write_reg(STMPE811_REG_INT_EN, 1, 0x02); // Interrupt on INT pin when FIFO is equal or above threshold value OR touch is detected
write_reg(STMPE811_REG_ADC_CTRL1, 1, 0x48); // ADC conversion time = 80 clock ticks, 12-bit ADC, internal voltage refernce
chThdSleepMilliseconds(2);
write_reg(STMPE811_REG_ADC_CTRL2, 1, 0x01); // ADC speed 3.25MHz
write_reg(STMPE811_REG_GPIO_AF, 1, 0x00); // GPIO alternate function - OFF
write_reg(STMPE811_REG_TSC_CFG, 1, 0x9A); // Averaging 4, Touch detect delay 500 us, Panel driver settling time 500 us
write_reg(STMPE811_REG_TSC_CFG, 1, 0x9A); // Averaging 4, touch detect delay 500 us, panel driver settling time 500 us
write_reg(STMPE811_REG_FIFO_TH, 1, 0x01); // FIFO threshold = 1
write_reg(STMPE811_REG_FIFO_STA, 1, 0x01); // FIFO reset enable
write_reg(STMPE811_REG_FIFO_STA, 1, 0x00); // FIFO reset disable
write_reg(STMPE811_REG_TSC_FRACT_XYZ, 1, 0x07); // Z axis data format
write_reg(STMPE811_REG_TSC_I_DRIVE, 1, 0x01); // 50mA touchscreen line current
write_reg(STMPE811_REG_TSC_CTRL, 1, 0x03); // X&Y only, TSC enable
write_reg(STMPE811_REG_TSC_CTRL, 1, 0x01); // X&Y&Z, TSC enable
write_reg(STMPE811_REG_INT_STA, 1, 0xFF); // Clear all interrupts
write_reg(STMPE811_REG_INT_CTRL, 1, 0x01); // Level interrupt, enable intrrupts
}
@ -102,7 +102,7 @@ void ginput_lld_mouse_init(void)
*/
void ginput_lld_mouse_get_reading(MouseReading *pt)
{
uint16_t buf;
//uint16_t buf;
uint8_t int_status;
// If not touched, return the previous results
@ -118,26 +118,39 @@ void ginput_lld_mouse_get_reading(MouseReading *pt)
int_status = read_reg(STMPE811_REG_INT_STA, 1);
// If it is TOUCH interrupt, clear it and go on
if (int_status & 0x01) {
write_reg(STMPE811_REG_INT_STA, 1, 0x01);
if (int_status & 0x02) {
/* Get the X value */
buf = read_reg(STMPE811_REG_TSC_DATA_X, 2);
lastx = (coord_t)(buf);
uint8_t size = 0;
size = read_reg(STMPE811_REG_FIFO_SIZE, 1);
/* Get the Y value */
buf = read_reg(STMPE811_REG_TSC_DATA_Y, 2);
lasty = (coord_t)(buf);
if (size) {
uint8_t buffer[size * 4];
read_reg_n(STMPE811_REG_TSC_DATA_AI, size * 4, buffer);
/* Get the Z value */
buf = read_reg(STMPE811_REG_TSC_DATA_Z, 1);
lastz = (buf & 0x00FF);
lastx = (coord_t)((buffer[0] << 4) | (buffer[1] >> 4));
lasty = (coord_t)(((buffer[1] & 0x0F) << 8) | buffer[2]);
lastz = (coord_t)buffer[3];
// Return the results. ADC gives values from 0 to 2^12
pt->x = lastx / 13;
pt->y = lasty / 17;
pt->z = 100;
pt->buttons = GINPUT_TOUCH_PRESSED;
/* Get the X value */
//buf = read_reg(STMPE811_REG_TSC_DATA_X, 2);
//lastx = (coord_t)(buf);
/* Get the Y value */
//buf = read_reg(STMPE811_REG_TSC_DATA_Y, 2);
//lasty = (coord_t)(buf);
/* Get the Z value */
//buf = read_reg(STMPE811_REG_TSC_DATA_Z, 1);
//lastz = (buf & 0x00FF);
// Return the results. ADC gives values from 0 to 2^12
pt->x = 320 - lastx / 13;
pt->y = lasty / 17;
pt->z = lastz;
pt->buttons = GINPUT_TOUCH_PRESSED;
}
write_reg(STMPE811_REG_INT_STA, 1, 0x02);
}
}

12
drivers/ginput/touch/STMPE811/ginput_lld_mouse_board_embest_dmstf4bb.h
View File

@ -123,5 +123,17 @@ static uint16_t read_reg(uint8_t reg, uint8_t n)
return ret;
}
static void read_reg_n(uint8_t reg, uint8_t n, uint8_t *rxbuf)
{
uint8_t txbuf[1];
i2cAcquireBus(&I2CD1);
txbuf[0] = reg;
i2cMasterTransmitTimeout(&I2CD1, STMPE811_ADDR, txbuf, 1, rxbuf, n, MS2ST(STMPE811_TIMEOUT));
i2cReleaseBus(&I2CD1);
}
#endif /* _GINPUT_LLD_MOUSE_BOARD_H */
/** @} */

4
drivers/ginput/touch/STMPE811/ginput_lld_mouse_config.h
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@ -31,10 +31,10 @@
#define _LLD_GINPUT_MOUSE_CONFIG_H
#define GINPUT_MOUSE_EVENT_TYPE GEVENT_TOUCH
#define GINPUT_MOUSE_NEED_CALIBRATION FALSE
#define GINPUT_MOUSE_NEED_CALIBRATION TRUE
#define GINPUT_MOUSE_LLD_CALIBRATION_LOADSAVE FALSE
#define GINPUT_MOUSE_MAX_CALIBRATION_ERROR 5
#define GINPUT_MOUSE_READ_CYCLES 1//4
#define GINPUT_MOUSE_READ_CYCLES 1
#define GINPUT_MOUSE_POLL_PERIOD 25
#define GINPUT_MOUSE_MAX_CLICK_JITTER 10
#define GINPUT_MOUSE_MAX_MOVE_JITTER 2

1
drivers/ginput/touch/STMPE811/stmpe811.h
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@ -92,6 +92,7 @@
#define STMPE811_REG_TSC_DATA_XYZ 0x52 // 32-bit
#define STMPE811_REG_TSC_FRACT_XYZ 0x56
#define STMPE811_REG_TSC_DATA 0x57
#define STMPE811_REG_TSC_DATA_AI 0xD7
#define STMPE811_REG_TSC_I_DRIVE 0x58
#define STMPE811_REG_TSC_SHIELD 0x59