MD3x0: using new STM32 GPS driver

meson.build

@@ -385,7 +385,8 @@ md3x0_src = ['platform/drivers/CPS/cps_io_native_MD3x0.c',
              'platform/drivers/keyboard/keyboard_MD3x.c',
              'platform/drivers/display/HX8353_MD3x.cpp',
              'platform/drivers/backlight/backlight_MDx.c',
-             'platform/drivers/GPS/GPS_MDx.cpp',
+             'platform/drivers/GPS/gps_stm32.cpp',
+             'platform/drivers/GPS/nmea_rbuf.c',
              'platform/targets/MD-3x0/platform.c',
              'platform/targets/MD-3x0/hwconfig.c']
 

platform/targets/MD-3x0/hwconfig.c

@@ -18,13 +18,28 @@
  *   along with this program; if not, see <http://www.gnu.org/licenses/>   *
  ***************************************************************************/
 
+#include <peripherals/gpio.h>
 #include <spi_bitbang.h>
 #include <spi_custom.h>
 #include <spi_stm32.h>
 #include <adc_stm32.h>
+#include <gps_stm32.h>
 #include <SKY72310.h>
 #include <hwconfig.h>
 #include <pinmap.h>
+#include <gps.h>
+
+static void gpsEnable(void *priv)
+{
+    gpio_setPin(GPS_EN);
+    gpsStm32_enable(priv);
+}
+
+static void gpsDisable(void *priv)
+{
+    gpio_clearPin(GPS_EN);
+    gpsStm32_disable(priv);
+}
 
 const struct spiConfig spiPllCfg =
 {
@@ -57,3 +72,11 @@ const struct sky73210 pll =
     .cs     = { PLL_CS },
     .refClk = 16800000
 };
+
+const struct gpsDevice gps =
+{
+    .priv = NULL,
+    .enable = gpsEnable,
+    .disable = gpsDisable,
+    .getSentence = gpsStm32_getNmeaSentence
+};

platform/targets/MD-3x0/hwconfig.h

@@ -35,6 +35,7 @@ enum adcChannel
     ADC_RSSI_CH  = 8
 };
 
+extern const struct gpsDevice gps;
 extern const struct spiDevice nvm_spi;
 extern const struct spiCustomDevice pll_spi;
 extern const struct spiCustomDevice c5000_spi;
@@ -46,6 +47,8 @@ extern const struct Adc adc1;
 
 /* Device supports an optional GPS chip */
 #define CONFIG_GPS
+#define CONFIG_GPS_STM32_USART3
+#define CONFIG_NMEA_RBUF_SIZE 128
 
 /* Device has a channel selection knob */
 #define CONFIG_KNOB_ABSOLUTE

platform/targets/MD-3x0/platform.c

@@ -20,6 +20,7 @@
 #include <peripherals/gpio.h>
 #include <interfaces/nvmem.h>
 #include <interfaces/platform.h>
+#include <interfaces/delays.h>
 #include <hwconfig.h>
 #include <string.h>
 #include <adc_stm32.h>
@@ -27,6 +28,8 @@
 #include <toneGenerator_MDx.h>
 #include <peripherals/rtc.h>
 #include <interfaces/audio.h>
+#include <gps_stm32.h>
+#include <gps.h>
 
 static hwInfo_t hwInfo;
 
@@ -74,6 +77,7 @@ void platform_terminate()
 
     /* Shut down all the modules */
     adcStm32_terminate(&adc1);
+    gpsStm32_terminate();
     nvm_terminate();
     toneGen_terminate();
     audio_terminate();
@@ -225,3 +229,28 @@ const hwInfo_t *platform_getHwInfo()
 {
     return &hwInfo;
 }
+
+const struct gpsDevice *platform_initGps()
+{
+    const struct gpsDevice *dev = NULL;
+
+    // Turn on the GPS and check if there is voltage on the RXD pin
+    gpio_setMode(GPS_DATA, INPUT_PULL_DOWN);
+    gpio_setMode(GPS_EN, OUTPUT);
+    gpio_setPin(GPS_EN);
+
+    for(size_t i = 0; i < 50; i++) {
+        if(gpio_readPin(GPS_DATA) != 0) {
+            dev = &gps;
+            gpsStm32_init(9600);
+            break;
+        }
+
+        sleepFor(0, 1);
+    }
+
+    gpio_clearPin(GPS_EN);
+    gpio_setMode(GPS_DATA, ALTERNATE | ALTERNATE_FUNC(7));
+
+    return dev;
+}