Implemented I2C routines for AT1846S on MD-UV3x0

platform/drivers/baseband/interfaces_UV3x0.c

@@ -0,0 +1,228 @@
+/***************************************************************************
+ *   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 <http://www.gnu.org/licenses/>   *
+ ***************************************************************************/
+
+#include <hwconfig.h>
+#include <interfaces/gpio.h>
+#include <interfaces/delays.h>
+#include <interfaces/platform.h>
+#include <stdint.h>
+#include <string.h>
+#include "interfaces.h"
+
+void _i2c_start();
+void _i2c_stop();
+void _i2c_ack();
+void _i2c_nack();
+void _i2c_write(uint8_t val);
+uint8_t _i2c_read();
+
+/*
+ * 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 = 0x5C;
+
+void i2c_init()
+{
+    gpio_setMode(I2C_SDA, INPUT);
+    gpio_setMode(I2C_SCL, OUTPUT);
+    gpio_clearPin(I2C_SCL);
+}
+
+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 valHi = (value >> 8) & 0xFF;
+    uint8_t valLo = value & 0xFF;
+
+    _i2c_start();
+    _i2c_write(devAddr);
+    _i2c_write(reg);
+    _i2c_write(valHi);
+    _i2c_write(valLo);
+    _i2c_stop();
+}
+
+uint16_t i2c_readReg16(uint8_t reg)
+{
+    uint8_t valHi = 0;
+    uint8_t valLo = 0;
+
+    _i2c_start();
+    _i2c_write(devAddr);
+    _i2c_write(reg);
+    _i2c_start();
+    _i2c_write(devAddr | 0x01);
+    _i2c_read(valHi);
+    _i2c_ack();
+    _i2c_read(valLo);
+    _i2c_nack();
+    _i2c_stop();
+
+    return (valHi << 8) | valLo;
+}
+
+/*
+ * Implementation of HR_C6000 "user" SPI interface.
+ */
+
+void uSpi_init()
+{
+}
+
+uint8_t uSpi_sendRecv(uint8_t val)
+{
+}
+
+/*
+ * Software I2C routine
+ */
+
+void _i2c_start()
+{
+    gpio_setMode(I2C_SDA, OUTPUT);
+
+    gpio_clearPin(I2C_SCL);
+    delayUs(2);
+
+    gpio_setPin(I2C_SDA);
+    delayUs(2);
+
+    gpio_setPin(I2C_SCL);
+    delayUs(2);
+
+    gpio_clearPin(I2C_SDA);
+    delayUs(2);
+
+    gpio_clearPin(I2C_SCL);
+    delayUs(6);
+}
+
+void _i2c_stop()
+{
+    gpio_setMode(I2C_SDA, OUTPUT);
+
+    gpio_clearPin(I2C_SCL);
+    delayUs(2);
+
+    gpio_clearPin(I2C_SDA);
+    delayUs(2);
+
+    gpio_setPin(I2C_SCL);
+    delayUs(2);
+
+    gpio_setPin(I2C_SDA);
+    delayUs(2);
+
+    gpio_clearPin(I2C_SCL);
+    delayUs(2);
+}
+
+void _i2c_ack()
+{
+    gpio_setMode(I2C_SDA, OUTPUT);
+    gpio_clearPin(I2C_SDA);
+
+    gpio_clearPin(I2C_SCL);
+    delayUs(2);
+
+    gpio_setPin(I2C_SCL);
+    delayUs(2);
+
+    gpio_clearPin(I2C_SCL);
+    delayUs(2);
+}
+
+void _i2c_nack()
+{
+    gpio_setMode(I2C_SDA, OUTPUT);
+    gpio_setPin(I2C_SDA);
+
+    gpio_clearPin(I2C_SCL);
+    delayUs(2);
+
+    gpio_setPin(I2C_SCL);
+    delayUs(2);
+
+    gpio_clearPin(I2C_SCL);
+    delayUs(2);
+}
+
+void _i2c_write(uint8_t val)
+{
+    gpio_setMode(I2C_SDA, OUTPUT);
+
+    for(uint8_t i = 0; i < 8; i++)
+    {
+        gpio_clearPin(I2C_SCL);
+        delayUs(1);
+
+        if(val & 0x80)
+        {
+            gpio_setPin(I2C_SDA);
+        }
+        else
+        {
+            gpio_clearPin(I2C_SDA);
+        }
+
+        val <<= 1;
+        delayUs(1);
+        gpio_setPin(I2C_SCL);
+        delayUs(2);
+    }
+
+    /* Clock cycle for slave ACK/NACK */
+    gpio_setMode(I2C_SDA, INPUT_PULL_UP);
+    gpio_clearPin(I2C_SCL);
+    delayUs(2);
+    gpio_setPin(I2C_SCL);
+    delayUs(2);
+    gpio_clearPin(I2C_SCL);
+    delayUs(8);
+}
+
+uint8_t _i2c_read()
+{
+    gpio_setMode(I2C_SDA, INPUT);
+    gpio_clearPin(I2C_SCL);
+
+    uint8_t value = 0;
+    for(uint8_t i = 0; i < 8; i++)
+    {
+        gpio_setPin(I2C_SCL);
+        delayUs(2);
+
+        value <<= 1;
+        value |= gpio_readPin(I2C_SDA);
+
+        gpio_clearPin(I2C_SCL);
+        delayUs(2);
+    }
+
+    return value;
+}

platform/targets/MD-UV380/hwconfig.h

@@ -113,6 +113,22 @@
 #define GPS_EN   GPIOA,9
 #define GPS_DATA GPIOA,10
 
+/* RTX stage control */
+#define VHF_LNA_EN GPIOA,5
+#define UHF_LNA_EN GPIOA,2
+
+/* I2C for AT1846S */
+#define I2C_SDA GPIOC,9
+#define I2C_SCL GPIOA,8
+
+/* HR_C6000 control interface */
+#define DMR_SLEEP GPIOE,6
+#define DMR_CS    GPIOE,2
+#define DMR_CLK   GPIOE,3
+#define DMR_MOSI  GPIOE,4
+#define DMR_MISO  GPIOE,5
+
+
 /*
  * To enable pwm for display backlight dimming uncomment this directive.
  *