NFC emulation software tunning (#1341)

* digital_signal: optimize calculationxx
* firmware: add listen start and listen rx
* digital signal: rework with fixed point calculation
* nfc: tune timings
* nfc: fix array overflow
* mifare classic: fix key access
* nfc: rework spi bus access
* nfc: rework listen mode with st25r3916 calls
* digital signal: speed up digital_signal_append()
* digital signal: remove unused profiling
* nfc: clean up code
* nfc: correct sleep state
* nfc: add unit tests
* nfc: fix memory leak in unit test
* digital_signal: remove unused code
* nfc: fix incorrect sak load in pt memory

Co-authored-by: あく <alleteam@gmail.com>

lib/ST25RFAL002/platform.c

@@ -6,11 +6,13 @@
 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) {
@@ -71,10 +73,30 @@ bool platformSpiTxRx(const uint8_t* txBuf, uint8_t* rxBuf, uint16_t len) {
     return ret;
 }
 
-void platformProtectST25RComm() {
+// 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);
 }
 
-void platformUnprotectST25RComm() {
+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);
+    }
 }