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https://github.com/trezor/trezor-firmware.git
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refactor(core/embed): use new i2c driver in ft6x36 driver
[no changelog]
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cepetr
cepetr
parent
ed74f8302f
commit
35937a9bfe
@ -27,7 +27,7 @@
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#include "common.h"
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#include "ft6x36.h"
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#include "i2c.h"
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#include "i2c_bus.h"
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#include "touch.h"
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#ifdef TOUCH_PANEL_LX154A2422CPT23
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@ -40,6 +40,8 @@
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typedef struct {
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// Set if the driver is initialized
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secbool initialized;
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// I2c bus where the touch controller is connected
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i2c_bus_t* i2c_bus;
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// Set if the driver is ready to report touches.
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// FT6X36 needs about 300ms after power-up to stabilize.
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secbool ready;
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@ -71,30 +73,32 @@ static touch_driver_t g_touch_driver = {
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//
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// If the I2C bus is busy, the function will cycle the
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// bus and retry the operation.
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static secbool ft6x36_read_regs(uint8_t reg, uint8_t* value, size_t count) {
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uint16_t i2c_bus = TOUCH_I2C_INSTANCE;
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uint8_t i2c_addr = FT6X36_I2C_ADDR;
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uint8_t txdata[] = {reg};
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uint8_t retries = 3;
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static secbool ft6x36_read_regs(i2c_bus_t* bus, uint8_t reg, uint8_t* value,
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size_t count) {
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i2c_op_t ops[] = {
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{
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.flags = I2C_FLAG_TX | I2C_FLAG_EMBED,
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.size = 1,
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.data = {reg},
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},
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{
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.flags = I2C_FLAG_RX,
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.size = count,
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.ptr = value,
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},
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};
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do {
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int result = i2c_transmit(i2c_bus, i2c_addr, txdata, sizeof(txdata), 10);
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if (HAL_OK == result) {
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result = i2c_receive(i2c_bus, i2c_addr, value, count, 10);
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}
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i2c_packet_t pkt = {
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.address = FT6X36_I2C_ADDR,
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.op_count = ARRAY_LENGTH(ops),
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.ops = ops,
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};
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if (HAL_OK == result) {
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// success
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return sectrue;
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} else if (HAL_BUSY == result && retries > 0) {
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// I2C bus is busy, cycle it and try again
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i2c_cycle(i2c_bus);
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retries--;
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} else {
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// Aother error or retries exhausted
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return secfalse;
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}
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} while (1);
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if (I2C_STATUS_OK != i2c_bus_submit_and_wait(bus, &pkt)) {
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return secfalse;
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}
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return sectrue;
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}
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// Writes a register to the FT6X36.
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@ -104,26 +108,26 @@ static secbool ft6x36_read_regs(uint8_t reg, uint8_t* value, size_t count) {
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//
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// If the I2C bus is busy, the function will cycle the
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// bus and retry the operation.
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static secbool ft6x36_write_reg(uint8_t reg, uint8_t value) {
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uint16_t i2c_bus = TOUCH_I2C_INSTANCE;
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uint8_t i2c_addr = FT6X36_I2C_ADDR;
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uint8_t txdata[] = {reg, value};
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uint8_t retries = 3;
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static secbool ft6x36_write_reg(i2c_bus_t* bus, uint8_t reg, uint8_t value) {
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i2c_op_t ops[] = {
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{
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.flags = I2C_FLAG_TX | I2C_FLAG_EMBED,
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.size = 2,
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.data = {reg, value},
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},
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};
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do {
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int result = i2c_transmit(i2c_bus, i2c_addr, txdata, sizeof(txdata), 10);
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if (HAL_OK == result) {
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// success
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return sectrue;
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} else if (HAL_BUSY == result && retries > 0) {
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// I2C bus is busy, cycle it and try again
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i2c_cycle(i2c_bus);
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retries--;
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} else {
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// Another error or retries exhausted
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return secfalse;
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}
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} while (1);
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i2c_packet_t pkt = {
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.address = FT6X36_I2C_ADDR,
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.op_count = ARRAY_LENGTH(ops),
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.ops = ops,
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};
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if (I2C_STATUS_OK != i2c_bus_submit_and_wait(bus, &pkt)) {
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return secfalse;
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}
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return sectrue;
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}
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// Powers down the touch controller and puts all
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@ -208,7 +212,7 @@ static bool ft6x36_test_and_clear_interrupt(void) {
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}
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// Configures the touch controller to the funtional state.
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static secbool ft6x36_configure(void) {
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static secbool ft6x36_configure(i2c_bus_t* i2c_bus) {
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const static uint8_t config[] = {
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// Set touch controller to the interrupt trigger mode.
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// Basically, CTPM generates a pulse when new data is available.
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@ -224,7 +228,7 @@ static secbool ft6x36_configure(void) {
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uint8_t reg = config[i];
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uint8_t value = config[i + 1];
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if (sectrue != ft6x36_write_reg(reg, value)) {
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if (sectrue != ft6x36_write_reg(i2c_bus, reg, value)) {
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return secfalse;
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}
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}
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@ -250,6 +254,8 @@ secbool touch_init(void) {
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return sectrue;
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}
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memset(driver, 0, sizeof(touch_driver_t));
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// Initialize GPIO to the default configuration
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// (touch controller is powered down)
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ft6x36_power_down();
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@ -257,10 +263,14 @@ secbool touch_init(void) {
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// Power up the touch controller and perform the reset sequence
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ft6x36_power_up();
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driver->i2c_bus = i2c_bus_open(TOUCH_I2C_INSTANCE);
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if (driver->i2c_bus == NULL) {
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goto cleanup;
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}
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// Configure the touch controller
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if (sectrue != ft6x36_configure()) {
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ft6x36_power_down();
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return secfalse;
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if (sectrue != ft6x36_configure(driver->i2c_bus)) {
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goto cleanup;
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}
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driver->init_ticks = hal_ticks_ms();
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@ -269,16 +279,20 @@ secbool touch_init(void) {
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driver->initialized = sectrue;
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return sectrue;
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cleanup:
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i2c_bus_close(driver->i2c_bus);
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ft6x36_power_down();
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memset(driver, 0, sizeof(touch_driver_t));
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return secfalse;
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}
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void touch_deinit(void) {
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touch_driver_t* driver = &g_touch_driver;
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if (sectrue == driver->initialized) {
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// Do not need to deinitialized the controller
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// just power it off
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i2c_bus_close(driver->i2c_bus);
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ft6x36_power_down();
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memset(driver, 0, sizeof(touch_driver_t));
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}
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}
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@ -301,7 +315,7 @@ secbool touch_set_sensitivity(uint8_t value) {
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touch_driver_t* driver = &g_touch_driver;
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if (sectrue == driver->initialized) {
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return ft6x36_write_reg(FT6X36_REG_TH_GROUP, value);
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return ft6x36_write_reg(driver->i2c_bus, FT6X36_REG_TH_GROUP, value);
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} else {
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return secfalse;
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}
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@ -324,7 +338,8 @@ uint8_t touch_get_version(void) {
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uint8_t fw_version = 0;
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if (sectrue != ft6x36_read_regs(FT6X36_REG_FIRMID, &fw_version, 1)) {
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if (sectrue !=
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ft6x36_read_regs(driver->i2c_bus, FT6X36_REG_FIRMID, &fw_version, 1)) {
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ft6x36_power_down();
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return secfalse;
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}
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@ -432,7 +447,7 @@ uint32_t touch_get_event(void) {
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driver->read_ticks = ticks;
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// Read the set of registers containing touch event and coordinates
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if (sectrue != ft6x36_read_regs(0x00, regs, sizeof(regs))) {
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if (sectrue != ft6x36_read_regs(driver->i2c_bus, 0x00, regs, sizeof(regs))) {
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// Failed to read the touch registers
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return 0;
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}
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@ -21,8 +21,7 @@
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#define _TOUCH_FT6X36_H
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// I2C address of the FT6X36 on the I2C bus.
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// `<< 1` is required because the HAL expects the address to be shifted by 1.
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#define FT6X36_I2C_ADDR (0x38 << 1)
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#define FT6X36_I2C_ADDR 0x38
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// ------------------------------------------------------------
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// FT6X36 registers
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