[riot-notifications] [RIOT-OS/RIOT] drivers/mrf24j40: add external PA/LNA control on MC/MD/ME devices (#11410)

benpicco notifications at github.com
Tue May 21 11:15:10 CEST 2019


benpicco commented on this pull request.



> +#else
+    (void) dev;
+#endif
+}
+
+void mrf24j40_enable_lna(mrf24j40_t *dev)
+{
+#if MRF24J40_USE_EXT_PA_LNA
+    /* Disable automatic switch on PA/LNA */
+    mrf24j40_reg_write_long(dev, MRF24J40_REG_TESTMODE, MRF24J40_TESTMODE_RSSIWAIT0);
+
+    /* Configure all GPIOs as Output */
+    mrf24j40_reg_write_short(dev, MRF24J40_REG_TRISGPIO, 0xF);
+
+    /* Enable LNA */
+    mrf24j40_reg_write_short(dev, MRF24J40_REG_GPIO, 0xC);

When the three TESTMODE bits in the TESTMODE register are set, mrf24j40 will controls those pins autonomously. (see [Section 1.3.1 PA/LNA CONTROL](http://ww1.microchip.com/downloads/en/devicedoc/75002a.pdf)) That single pin/bit enables the voltage regulator for the PA thats only present on the C version of the module and that is not controlled by the mrf24j40 automatically.

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