ttwrplus: enable Tx capability

Enabled Tx capability on T-TWR Plus.
Since Tx requires the SA8x8 to disable the Rx stage, we check that at
least firmware v.1.1.0.r14 is present on the baseband, otherwise we
don't initialize the radio.

TG-553

platform/drivers/baseband/radio_ttwrplus.cpp

@@ -28,6 +28,7 @@
 #include <algorithm>
 #include <string.h>
 #include <stdlib.h>
+#include <stdio.h>
 #include "AT1846S.h"
 #include "radioUtils.h"
 
@@ -120,6 +121,14 @@ char *radio_getFwVersion()
     return tx_buf;
 }
 
+char *radio_getModel()
+{
+    char *tx_buf = (char *) malloc(sizeof(char) * SA8X8_MSG_SIZE);
+    radio_uartPrint("AT+MODEL\r\n");
+    k_msgq_get(&uart_msgq, tx_buf, K_FOREVER);
+    return tx_buf;
+}
+
 void radio_init(const rtxStatus_t *rtxState)
 {
     config      = rtxState;
@@ -164,8 +173,19 @@ void radio_init(const rtxStatus_t *rtxState)
         return;
     }
 
-    // Add SA8x8 FW version to Info menu
-    ui_registerInfoExtraEntry("Radio", radio_getFwVersion);
+    // A small delay is needed to have SA8x8 ready to serve commands
+    delayMs(100);
+
+    // Check for minimum supported firmware version.
+    char *fwVersionStr = radio_getFwVersion();
+    uint8_t major = 0, minor = 0, patch = 0, release = 0;
+    sscanf(fwVersionStr, "sa8x8-fw/v%hhu.%hhu.%hhu.r%hhu", &major, &minor, &patch, &release);
+    if (major < 1 || (major == 1 && minor < 1) || (major == 1 && minor == 1 && patch == 0 && release < 14))
+    {
+        printk("Error: unsupported baseband firmware, please update!\n");
+        return;
+    }
+    free(fwVersionStr);
 
     // TODO: Implement audio paths configuration
 
@@ -251,8 +271,6 @@ void radio_enableRx()
 
 void radio_enableTx()
 {
-    // TODO; Do not enable Tx until proven to be safe
-    return;
     if(config->txDisable == 1) return;
 
     at1846s.setFrequency(config->txFrequency);