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SAM3U-EK: Correct polarity of the PENIRQ signal

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This commit is contained in:
Gregory Nutt 2013-06-16 14:31:18 -06:00
parent 28a7c22757
commit 5ed3283b02
3 changed files with 19 additions and 16 deletions
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14
configs/sam3u-ek/README.txt
View File

@ -581,6 +581,7 @@ Configuration sub-directories
CONFIG_INPUT_ADS7843E=y : Enable support for the XPT2048
CONFIG_ADS7843E_SPIDEV=2 : Use SPI CS 2 for communication
CONFIG_ADS7843E_SPIMODE=0 : Use SPI mode 0
CONFIG_ADS7843E_FREQUENCY=1000000 : SPI BAUD 1MHz
CONFIG_ADS7843E_THRESHX=39 : These will probably need to be tuned
CONFIG_ADS7843E_THRESHY=51
@ -609,14 +610,11 @@ Configuration sub-directories
CONFIG_DEBUG_INPUT=y : Enable debug output from input devices
STATUS:
2013-6-14: The touchscreen is not functional. BUSY is initially
'0' when asserted says '1'. The pend down GPIO inputis always
'1' and there seems to be many spurious interrupts (but not so
many as to lock up the system).
So there are GIO issues, but on the positive side, the driver
does appear to produce good touch data when touched but a lot
of clean-up is needed.
2013-6-16: The touchscreen is not functional. It seems to
perform good measurements but I am not getting the /PENIRQ
interrupt. The interrupt is set up correctly (I can ground
A24 and I get the interrupt), so apparently the ADS7843E is
not generating interrupts.
nx:
Configures to use examples/nx using the HX834x LCD hardware on

17
configs/sam3u-ek/src/sam3u-ek.h
View File

@ -143,14 +143,19 @@
*
* The IRQ is active low and pulled up.
*
* Pen Interrupt. Open anode output, requires 10kO to 100kO pull-up resistor
* externally. There is a 100KO pull-up on the SAM3U-EK board so no additional
* pull-up should be required.
*
* BUSY is high impedance when CS is high (not selected). When CS is
* is low, BUSY is active high. Since the pin is pulled up, it will appear
* busy if CS is not selected.
* busy if CS is not selected (there is no pull-up onboard).
*/
#define GPIO_TCS_IRQ (GPIO_INPUT | GPIO_CFG_PULLUP | GPIO_INT_BOTHEDGES | \
GPIO_PORT_PIOA | GPIO_PIN24)
#define GPIO_TCS_BUSY (GPIO_INPUT | GPIO_CFG_PULLUP | GPIO_PORT_PIOA | GPIO_PIN2)
#define GPIO_TCS_BUSY (GPIO_INPUT | GPIO_CFG_PULLUP | GPIO_PORT_PIOA | \
GPIO_PIN2)
#define SAM_TCS_IRQ SAM_IRQ_PA24
@ -165,10 +170,10 @@
/* BUTTONS */
#define GPIO_BUTTON1 (GPIO_INPUT | GPIO_CFG_PULLUP | GPIO_CFG_DEGLITCH | GPIO_INT_BOTHEDGES | \
GPIO_PORT_PIOA | GPIO_PIN18)
#define GPIO_BUTTON2 (GPIO_INPUT | GPIO_CFG_PULLUP | GPIO_CFG_DEGLITCH | GPIO_INT_BOTHEDGES | \
GPIO_PORT_PIOA | GPIO_PIN19)
#define GPIO_BUTTON1 (GPIO_INPUT | GPIO_CFG_PULLUP | GPIO_CFG_DEGLITCH | \
GPIO_INT_BOTHEDGES | GPIO_PORT_PIOA | GPIO_PIN18)
#define GPIO_BUTTON2 (GPIO_INPUT | GPIO_CFG_PULLUP | GPIO_CFG_DEGLITCH | \
GPIO_INT_BOTHEDGES | GPIO_PORT_PIOA | GPIO_PIN19)
#define IRQ_BUTTON1 SAM_IRQ_PA18
#define IRQ_BUTTON2 SAM_IRQ_PA19

4
configs/sam3u-ek/src/up_touchscreen.c
View File

@ -201,9 +201,9 @@ static bool tsc_busy(FAR struct ads7843e_config_s *state)
static bool tsc_pendown(FAR struct ads7843e_config_s *state)
{
/* REVISIT: This might need to be inverted */
/* The /PENIRQ value is active low */
bool pendown = sam_gpioread(GPIO_TCS_IRQ);
bool pendown = !sam_gpioread(GPIO_TCS_IRQ);
ivdbg("pendown:%d\n", pendown);
return pendown;
}