diff --git a/meson.build b/meson.build
index 90c81f78..76da2a56 100644
--- a/meson.build
+++ b/meson.build
@@ -263,7 +263,10 @@ dm1801_src = src + mk22fn512_src + ['platform/targets/DM-1801/platform.c',
'platform/drivers/NVM/spiFlash_GDx.c',
'platform/drivers/NVM/nvmem_GDx.c',
'platform/drivers/ADC/ADC0_GDx.c',
- 'platform/drivers/baseband/rtx_GDx.c']
+ 'platform/drivers/baseband/rtx_GDx.c',
+ 'platform/drivers/baseband/AT1846S.c',
+ 'platform/drivers/baseband/HR-C6000.c',
+ 'platform/drivers/baseband/interfaces_GDx.c']
dm1801_inc = inc + mk22fn512_inc + ['platform/targets/DM-1801']
dm1801_def = def + mk22fn512_def + {'PLATFORM_DM1801': ''}
diff --git a/platform/drivers/baseband/interfaces.h b/platform/drivers/baseband/interfaces.h
new file mode 100644
index 00000000..ccdf1240
--- /dev/null
+++ b/platform/drivers/baseband/interfaces.h
@@ -0,0 +1,60 @@
+/***************************************************************************
+ * Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO, *
+ * Niccolò Izzo IU2KIN *
+ * Frederik Saraci IU2NRO *
+ * Silvano Seva IU2KWO *
+ * *
+ * This program is free software; you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License as published by *
+ * the Free Software Foundation; either version 3 of the License, or *
+ * (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU General Public License *
+ * along with this program; if not, see *
+ ***************************************************************************/
+
+#ifndef INTERFACES_H
+#define INTERFACES_H
+
+#include
+
+/*
+ * This file provides a standard interface for low-level data exchange with the
+ * baseband chipset (HR_C6000, AT1846S, ...).
+ * Its aim is to provide a decoupling layer between the chipset drivers, written
+ * to be platform-agnostic, and the platform-specific communication busses.
+ */
+
+
+/**
+ * Initialise I2C subsystem.
+ */
+void i2c_init();
+
+/**
+ * AT1846S specific: write a device register.
+ */
+void i2c_writeReg16(uint8_t reg, uint16_t value);
+
+/**
+ * AT1846S specific: read a device register.
+ */
+uint16_t i2c_readReg16(uint8_t reg);
+
+/**
+ * HR_C5000 and HR_C6000: initialise "user" SPI interface, the one for chip
+ * configuration.
+ */
+void uSpi_init();
+
+/**
+ * HR_C5000 and HR_C6000: transfer one byte over the "user" SPI interface.
+ */
+uint8_t uSpi_sendRecv(uint8_t val);
+
+#endif /* INTERFACES_H */
diff --git a/platform/drivers/baseband/interfaces_GDx.c b/platform/drivers/baseband/interfaces_GDx.c
new file mode 100644
index 00000000..17b73b16
--- /dev/null
+++ b/platform/drivers/baseband/interfaces_GDx.c
@@ -0,0 +1,125 @@
+/***************************************************************************
+ * Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO, *
+ * Niccolò Izzo IU2KIN *
+ * Frederik Saraci IU2NRO *
+ * Silvano Seva IU2KWO *
+ * *
+ * This program is free software; you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License as published by *
+ * the Free Software Foundation; either version 3 of the License, or *
+ * (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU General Public License *
+ * along with this program; if not, see *
+ ***************************************************************************/
+
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include "interfaces.h"
+
+/*
+ * Implementation of AT1846S I2C interface.
+ *
+ * NOTE: on GDx devices the I2C bus is shared between the EEPROM and the AT1846S,
+ * so we have to acquire exclusive ownership before exchanging data
+ */
+
+static const uint8_t devAddr = 0xE2;
+
+void i2c_init()
+{
+ /* I2C already init'd by platform support package */
+}
+
+void i2c_writeReg16(uint8_t reg, uint16_t value)
+{
+ /*
+ * Beware of endianness!
+ * When writing an AT1846S register, bits 15:8 must be sent first, followed
+ * by bits 7:0.
+ */
+ uint8_t buf[3];
+ buf[0] = reg;
+ buf[1] = (value >> 8) & 0xFF;
+ buf[2] = value & 0xFF;
+
+ i2c0_lockDeviceBlocking();
+ i2c0_write(devAddr, buf, 3, true);
+ i2c0_releaseDevice();
+}
+
+uint16_t i2c_readReg16(uint8_t reg)
+{
+ uint16_t value = 0;
+
+ i2c0_lockDeviceBlocking();
+ i2c0_write(devAddr, ®, 1, false);
+ i2c0_read(devAddr, &value, 2);
+ i2c0_releaseDevice();
+
+ /* Correction for AT1846S sending register data in big endian format */
+ return __builtin_bswap16(value);
+}
+
+/*
+ * Implementation of HR_C6000 "user" SPI interface.
+ */
+
+void uSpi_init()
+{
+ gpio_setMode(DMR_CLK, OUTPUT);
+ gpio_setMode(DMR_MOSI, OUTPUT);
+ gpio_setMode(DMR_MISO, INPUT);
+
+ gpio_setAlternateFunction(DMR_CLK, 0);
+ gpio_setAlternateFunction(DMR_MOSI, 0);
+ gpio_setAlternateFunction(DMR_MISO, 0);
+
+ SIM->SCGC6 |= SIM_SCGC6_SPI0_MASK;
+
+ SPI0->MCR &= ~SPI_MCR_MDIS_MASK; /* Enable the SPI0 module */
+ SPI0->MCR |= SPI_MCR_MSTR_MASK /* Master mode */
+ | SPI_MCR_PCSIS_MASK /* CS high when inactive */
+ | SPI_MCR_DIS_RXF_MASK /* Disable RX FIFO */
+ | SPI_MCR_DIS_TXF_MASK /* Disable TX FIFO */
+ | SPI_MCR_HALT_MASK; /* Stop transfers */
+
+ SPI0->CTAR[0] = SPI_CTAR_FMSZ(7) /* 8bit frame size */
+ | SPI_CTAR_CPHA_MASK /* CPHA = 1 */
+ | SPI_CTAR_PBR(2) /* CLK prescaler divide by 5 */
+ | SPI_CTAR_BR(3) /* CLK scaler divide by 8 */
+ | SPI_CTAR_PCSSCK(1)
+ | SPI_CTAR_PASC(1)
+ | SPI_CTAR_CSSCK(4)
+ | SPI_CTAR_ASC(4);
+}
+
+uint8_t uSpi_sendRecv(uint8_t val)
+{
+ SPI0->MCR &= ~SPI_MCR_HALT_MASK; /* Start transfer */
+
+ SPI0->MCR |= SPI_MCR_CLR_TXF_MASK | SPI_MCR_CLR_RXF_MASK;
+
+ while((SPI0->SR & SPI_SR_TFFF_MASK) == 0) ;
+
+ SPI0->PUSHR = SPI_PUSHR_EOQ_MASK | val;
+
+ SPI0->SR |= SPI_SR_TFFF_MASK;
+
+ while((SPI0->SR & SPI_SR_RFDF_MASK) == 0) ;
+ SPI0->SR |= SPI_SR_RFDF_MASK;
+
+ SPI0->MCR |= SPI_MCR_HALT_MASK; /* Start transfer */
+
+ return SPI0->POPR;
+}
diff --git a/platform/targets/DM-1801/hwconfig.h b/platform/targets/DM-1801/hwconfig.h
index 24700816..12c64033 100644
--- a/platform/targets/DM-1801/hwconfig.h
+++ b/platform/targets/DM-1801/hwconfig.h
@@ -82,4 +82,22 @@
#define I2C_SDA GPIOE,25
#define I2C_SCL GPIOE,24
+/* RTX stage control */
+#define VHF_LNA_EN GPIOC,13
+#define UHF_LNA_EN GPIOC,15
+#define VHF_PA_EN GPIOE,0
+#define UHF_PA_EN GPIOE,1
+
+/* Audio control */
+#define AUDIO_AMP_EN GPIOB,0
+#define RX_AUDIO_MUX GPIOC,5
+#define TX_AUDIO_MUX GPIOC,6
+
+#define DMR_RESET GPIOE,2
+#define DMR_SLEEP GPIOE,3
+#define DMR_CS GPIOD,0
+#define DMR_CLK GPIOD,1
+#define DMR_MOSI GPIOD,2
+#define DMR_MISO GPIOD,3
+
#endif
diff --git a/platform/targets/DM-1801/platform.c b/platform/targets/DM-1801/platform.c
index 2b4274d2..0cf0d3b7 100644
--- a/platform/targets/DM-1801/platform.c
+++ b/platform/targets/DM-1801/platform.c
@@ -21,6 +21,7 @@
#include
#include
#include
+#include
#include
#include "hwconfig.h"
@@ -60,6 +61,15 @@ void platform_init()
*/
adc0_init();
OSMutexCreate(&adc_mutex, "", &e);
+
+ /*
+ * Initialise I2C driver, once for all the modules
+ */
+ gpio_setMode(I2C_SDA, OPEN_DRAIN);
+ gpio_setMode(I2C_SCL, OPEN_DRAIN);
+ gpio_setAlternateFunction(I2C_SDA, 3);
+ gpio_setAlternateFunction(I2C_SCL, 3);
+ i2c0_init();
}
void platform_terminate()