flipperzero-firmware/lib/ST25RFAL002/platform.c

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#include "platform.h"
#include <assert.h>
#include <furi.h>
#include <furi_hal_spi.h>
typedef struct {
FuriThread* thread;
volatile PlatformIrqCallback callback;
bool need_spi_lock;
} RfalPlatform;
static volatile RfalPlatform rfal_platform = {
.thread = NULL,
.callback = NULL,
.need_spi_lock = true,
};
void nfc_isr(void* _ctx) {
UNUSED(_ctx);
if(rfal_platform.callback && platformGpioIsHigh(ST25R_INT_PORT, ST25R_INT_PIN)) {
furi_thread_flags_set(furi_thread_get_id(rfal_platform.thread), 0x1);
}
}
int32_t rfal_platform_irq_thread(void* context) {
UNUSED(context);
while(1) {
uint32_t flags = furi_thread_flags_wait(0x1, osFlagsWaitAny, osWaitForever);
if(flags & 0x1) {
rfal_platform.callback();
}
}
}
void platformEnableIrqCallback() {
furi_hal_gpio_init(&gpio_nfc_irq_rfid_pull, GpioModeInterruptRise, GpioPullDown, GpioSpeedLow);
furi_hal_gpio_enable_int_callback(&gpio_nfc_irq_rfid_pull);
}
void platformDisableIrqCallback() {
furi_hal_gpio_init(&gpio_nfc_irq_rfid_pull, GpioModeOutputOpenDrain, GpioPullNo, GpioSpeedLow);
furi_hal_gpio_disable_int_callback(&gpio_nfc_irq_rfid_pull);
}
void platformSetIrqCallback(PlatformIrqCallback callback) {
rfal_platform.callback = callback;
rfal_platform.thread = furi_thread_alloc();
furi_thread_set_name(rfal_platform.thread, "RfalIrqDriver");
furi_thread_set_callback(rfal_platform.thread, rfal_platform_irq_thread);
furi_thread_set_stack_size(rfal_platform.thread, 1024);
furi_thread_set_priority(rfal_platform.thread, FuriThreadPriorityIsr);
furi_thread_start(rfal_platform.thread);
furi_hal_gpio_add_int_callback(&gpio_nfc_irq_rfid_pull, nfc_isr, NULL);
// Disable interrupt callback as the pin is shared between 2 apps
// It is enabled in rfalLowPowerModeStop()
furi_hal_gpio_disable_int_callback(&gpio_nfc_irq_rfid_pull);
}
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bool platformSpiTxRx(const uint8_t* txBuf, uint8_t* rxBuf, uint16_t len) {
bool ret = false;
if(txBuf && rxBuf) {
ret =
furi_hal_spi_bus_trx(&furi_hal_spi_bus_handle_nfc, (uint8_t*)txBuf, rxBuf, len, 1000);
} else if(txBuf) {
ret = furi_hal_spi_bus_tx(&furi_hal_spi_bus_handle_nfc, (uint8_t*)txBuf, len, 1000);
} else if(rxBuf) {
ret = furi_hal_spi_bus_rx(&furi_hal_spi_bus_handle_nfc, (uint8_t*)rxBuf, len, 1000);
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}
return ret;
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}
// Until we completely remove RFAL, NFC works with SPI from rfal_platform_irq_thread and nfc_worker
// threads. Some nfc features already stop using RFAL and work with SPI from nfc_worker only.
// rfal_platform_spi_acquire() and rfal_platform_spi_release() functions are used to lock SPI for a
// long term without locking it for each SPI transaction. This is needed for time critical communications.
void rfal_platform_spi_acquire() {
platformDisableIrqCallback();
rfal_platform.need_spi_lock = false;
furi_hal_spi_acquire(&furi_hal_spi_bus_handle_nfc);
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}
void rfal_platform_spi_release() {
furi_hal_spi_release(&furi_hal_spi_bus_handle_nfc);
rfal_platform.need_spi_lock = true;
platformEnableIrqCallback();
}
void platformProtectST25RComm() {
if(rfal_platform.need_spi_lock) {
furi_hal_spi_acquire(&furi_hal_spi_bus_handle_nfc);
}
}
void platformUnprotectST25RComm() {
if(rfal_platform.need_spi_lock) {
furi_hal_spi_release(&furi_hal_spi_bus_handle_nfc);
}
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}