diff --git a/CMakeLists.txt b/CMakeLists.txt
index c3241f6..2c32e80 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,8 +20,9 @@ add_compile_definitions(
STM32F1
STM32F103C8T6
DEBUG
+ TARGETS=stm32/f1
)
-add_executable(lora src/main.c)
+add_executable(lora src/main.c src/sx1276.c src/util.c include/util.h)
set_target_properties(lora PROPERTIES SUFFIX .elf)
@@ -33,5 +34,5 @@ add_subdirectory(RTT)
target_link_libraries(lora PUBLIC RTT)
target_include_directories(lora PUBLIC
- RTT ${LIBOPENCM3_DIR}/include
+ RTT ${LIBOPENCM3_DIR}/include include
)
diff --git a/RTT/SEGGER_RTT_Conf.h b/RTT/SEGGER_RTT_Conf.h
index 372d7b6..beb11aa 100644
--- a/RTT/SEGGER_RTT_Conf.h
+++ b/RTT/SEGGER_RTT_Conf.h
@@ -87,7 +87,7 @@ Revision: $Rev: 21386 $
#endif
#ifndef BUFFER_SIZE_UP
- #define BUFFER_SIZE_UP (256) // Size of the buffer for terminal output of target, up to host (Default: 1k)
+ #define BUFFER_SIZE_UP (1024) // Size of the buffer for terminal output of target, up to host (Default: 1k)
#endif
#ifndef BUFFER_SIZE_DOWN
diff --git a/include/delay.h b/include/delay.h
new file mode 100644
index 0000000..e259fad
--- /dev/null
+++ b/include/delay.h
@@ -0,0 +1,143 @@
+/*
+ * This file is part of the HAL project, inline library above libopencm3.
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see .
+ */
+/** @defgroup DELAY_module DELAY module
+ *
+ * @brief Spin-waiting blocking API
+ *
+ * @ingroup modules
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
+#ifndef HAL_DELAY_H_INCLUDED
+#define HAL_DELAY_H_INCLUDED
+
+#include
+#include
+
+/**@{*/
+
+/*****************************************************************************/
+/* API definitions */
+/*****************************************************************************/
+
+/*****************************************************************************/
+/* API Functions */
+/*****************************************************************************/
+
+BEGIN_DECLS
+
+/*---------------------------------------------------------------------------*/
+/** @brief Spin-wait delay, spinning specified amount of processor cycles
+ *
+ * @note this function can be used for delays of max 2500000 cycles.
+ * For larger delays, please consider using timers or other waiting techniques.
+ *
+ * @param[in] cycles Cycles count need to spent in spin-wait
+ */
+static void delay_cycles(const int64_t cycles);
+
+/*---------------------------------------------------------------------------*/
+/** @brief Spin-wait delay, spinning specified amount of microseconds
+ *
+ * @note this function can be used for delays max 25 sec @ 168MHz CPU clock, or
+ * max 525 sec @ 8MHz CPU clock! For larger delays, please consider using
+ * timers or other waiting techniques.
+ *
+ * @param[in] us Microseconds needed to spin wait.
+ * @param[in] cpufreq Current CPU frequency in Hz
+ */
+static void delay_us(uint32_t us);
+
+/*---------------------------------------------------------------------------*/
+/** @brief Spin-wait delay, spinning specified amount of microseconds
+ *
+ * @note this function can be used for delays max 25 sec @ 168MHz CPU clock, or
+ * max 525 sec @ 8MHz CPU clock! For larger delays, please consider using
+ * timers or other waiting techniques.
+ *
+ * @param[in] ms Milliseconds needed to spin wait.
+ * @param[in] cpufreq Current CPU frequency in Hz
+ */
+static void delay_ms(uint32_t ms);
+
+END_DECLS
+
+/**@}*/
+
+/*****************************************************************************/
+/* Architecture dependent implementations */
+/*****************************************************************************/
+
+static void _delay_3t(uint32_t cycles) __attribute__((naked));
+
+/* 3 Tcyc per tick, 4Tcyc call/ret, 1Tcyc hidden reg assignment */
+static void _delay_3t(uint32_t cycles)
+{
+ asm __volatile__ (
+ ".syntax unified\n"
+ "1: \n"
+ " subs %[cyc],#1 \n" /* 1Tck */
+ " bne 1b \n" /* 2Tck */
+ " bx lr \n"
+ ".syntax divided\n"
+ : /* No output */
+ : [cyc] "r" (cycles)
+ : /* No memory */
+ );
+}
+
+
+static inline __attribute__((always_inline)) void delay_cycles(const int64_t cycles)
+{
+ if (cycles <= 0)
+ return;
+
+ switch (cycles % 3) {
+ default:
+ case 0: break;
+ case 1: asm __volatile__ ("nop"); break;
+ case 2: asm __volatile__ ("nop\nnop"); break;
+ }
+
+ if (cycles > 3)
+ _delay_3t((uint32_t)(cycles / 3));
+ else /* same delay as the function call */
+ asm __volatile__ ("nop\nnop\nnop\nnop\nnop\nnop\n");
+}
+
+
+/* max 25 sec @ 168MHz! */
+/* max 525 sec @ 8MHz! */
+static inline __attribute__((always_inline)) void delay_us(uint32_t us)
+{
+ if (us == 0)
+ return;
+
+ delay_cycles(us * rcc_ahb_frequency / 1000000 - 6);
+}
+
+/* max 25 sec @ 168MHz! */
+/* max 525 sec @ 8MHz! */
+static inline __attribute__((always_inline)) void delay_ms(uint32_t ms)
+{
+ if (ms == 0)
+ return;
+
+ delay_cycles(ms * rcc_ahb_frequency / 1000 - 6);
+}
+
+#endif /* HAL_DELAY_H_INCLUDED */
diff --git a/include/sx1276.h b/include/sx1276.h
new file mode 100644
index 0000000..3811a56
--- /dev/null
+++ b/include/sx1276.h
@@ -0,0 +1,83 @@
+#include
+#include
+
+#define SX1276_RESET_PORT GPIOB
+#define SX1276_RESET_PIN GPIO0
+#define SX1276_SPI SPI1
+#define SX1276_SS_PORT GPIOA
+#define SX1276_SS_PIN GPIO4
+
+enum sx1276_reg {
+ SX1276_REG_FIFO = 0x00, // FIFO read/write access
+ SX1276_REG_OP_MODE = 0x01, // Operating mode & LoRa (1) / FSK (0) selection
+ SX1276_REG_FRF_MSB = 0x06, // RF Carrier Frequency, Most Significant Bits
+ SX1276_REG_FRF_MID = 0x07, // RF Carrier Frequency, Intermediate Bits
+ SX1276_REG_FRF_LSB = 0x08, // RF Carrier Frequency, Least Significant Bits
+ SX1276_REG_PA_CONFIG = 0x09, // PA selection and Output Power control
+ SX1276_REG_PA_RAMP = 0x0a, // Control of PA ramp time, low phase noise PLL
+ SX1276_REG_OCP = 0x0b, // Over Current Protection control
+ SX1276_REG_LNA = 0x0c, // LNA settings
+ SX1276_REG_FIFO_ADDR_PTR = 0x0d, // FIFO SPI pointer
+ SX1276_REG_FIFO_TX_BASE_ADDR = 0x0e, // Start Tx data
+ SX1276_REG_FIFO_RX_BASE_ADDR = 0x0f, // Start Rx data
+ SX1276_REG_FIFO_RX_CURRENT_ADDR = 0x10, // Start address of last packet received
+ SX1276_REG_IRQ_FLAGS = 0x12, // IRQ flags
+ SX1276_REG_RX_NB_BYTES = 0x13, // Number of received bytes
+ SX1276_REG_MODEM_STATUS = 0x18, // Live LoRa modem status
+ SX1276_REG_PKT_SNR_VALUE = 0x19, // Espimation of last packet SNR
+ SX1276_REG_PKT_RSSI_VALUE = 0x1a, // RSSI of last packet
+ SX1276_REG_MODEM_CONFIG_1 = 0x1d, // Modem PHY config 1
+ SX1276_REG_MODEM_CONFIG_2 = 0x1e, // Modem PHY config 2
+ SX1276_REG_PREAMBLE_MSB = 0x20, // Size of preamble
+ SX1276_REG_PREAMBLE_LSB = 0x21, // Size of preamble
+ SX1276_REG_PAYLOAD_LENGTH = 0x22, // LoRa payload length
+ SX1276_REG_MODEM_CONFIG_3 = 0x26, // Modem PHY config 3
+ SX1276_REG_RSSI_WIDEBAND = 0x2c, // Wideband RSSI measurement
+ SX1276_REG_DETECTION_OPTIMIZE = 0x31, // LoRa detection Optimize for SF6
+ SX1276_REG_DETECTION_THRESHOLD = 0x37, // LoRa detection threshold for SF6
+ SX1276_REG_SYNC_WORD = 0x39, // LoRa Sync Word
+ SX1276_REG_IRQ_FLAGS1 = 0x3e, // (FSK) Status register: PLL Lock state, Timeout, RSSI
+ SX1276_REG_DIO_MAPPING_1 = 0x40, // Mapping of pins DIO0 to DIO3
+ SX1276_REG_DIO_MAPPING_2 = 0x41, // Mapping of pins DIO4 and DIO5, ClkOut frequency
+ SX1276_REG_VERSION = 0x42 // Semtech ID relating the silicon revision (0x12)
+};
+
+enum sx1276_mode { // SX1276_REG_OP_MODE values
+ SX1276_MODE_LONG_RANGE_MODE = 1<<7, // Set to enable LoRa mode
+ SX1276_MODE_ACCESS_SHARED_REG = 1<<6, // Set to access FSK registers in 0x0D:0x3F while in LoRa mode
+ SX1276_MODE_LOW_FREQUENCY_MODE = 1<<3, // Set to access Low Frequency Mode registers
+ // 3 bits of LoRa Modes
+ SX1276_MODE_SLEEP = 0x00, // FSK and LoRa modes can only be swiched in SLEEP
+ SX1276_MODE_STDBY = 0x01,
+ SX1276_MODE_FSTX = 0x02, // Frequency synthesis TX
+ SX1276_MODE_TX = 0x03,
+ SX1276_MODE_FSRX = 0x04, // Frequency synthesis RX
+ SX1276_MODE_RX_CONTINUOUS = 0x05,
+ SX1276_MODE_RX_SINGLE = 0x06,
+ SX1276_MODE_CAD = 0x07 // Channel activity detection
+};
+
+// PA config
+#define PA_BOOST 1<<7
+
+// IRQ masks
+#define IRQ_TX_DONE_MASK 0x08
+#define IRQ_PAYLOAD_CRC_ERROR_MASK 0x20
+#define IRQ_RX_DONE_MASK 0x40
+
+// FSK IRQ FLAGS
+#define IRQ_FLAGS1_MODE_READY 1<<7 // Set when the operation mode requested in Mode, is ready
+
+#define FIFO_SIZE 0xff
+
+struct sx1276_state_st {
+ uint8_t fifo[FIFO_SIZE];
+};
+
+uint8_t sx1276_read(uint8_t reg);
+uint8_t sx1276_write(uint8_t reg, uint8_t val);
+void sx1276_fifo_dump(struct sx1276_state_st *state);
+void sx1276_fifo_load(struct sx1276_state_st *state);
+void sx1276_fifo_write(uint8_t addr, uint8_t val);
+void sx1276_set_frequency(uint64_t frequency);
+struct sx1276_state_st *sx1276_init(uint64_t frequency);
diff --git a/include/util.h b/include/util.h
new file mode 100644
index 0000000..ee83190
--- /dev/null
+++ b/include/util.h
@@ -0,0 +1,8 @@
+#ifndef DHT_TEST_UTIL_H
+#define DHT_TEST_UTIL_H
+
+#include
+
+void hexdump(char *buf, size_t size, uint32_t width);
+
+#endif //DHT_TEST_UTIL_H
diff --git a/src/main.c b/src/main.c
index a137895..3c697ef 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,29 +1,115 @@
#include
#include
+#include
#include
+#include
+
+#include "delay.h"
+#include "util.h"
+
+uint8_t FIFO[FIFO_SIZE] = {0};
+
+static void clock_setup(void)
+{
+ rcc_clock_setup_pll(&rcc_hse_configs[RCC_CLOCK_HSE8_72MHZ]);
+
+ rcc_periph_clock_enable(RCC_GPIOA);
+ rcc_periph_clock_enable(RCC_GPIOB);
+
+ rcc_periph_clock_enable(RCC_SPI1);
+}
static void gpio_setup(void)
{
- rcc_periph_clock_enable(RCC_GPIOB);
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
- GPIO_CNF_OUTPUT_PUSHPULL, GPIO1);
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO0 | GPIO1);
+}
+
+static void spi_setup(void)
+{
+ /* Configure GPIOs: SS=PA4, SCK=PA5, MISO=PA6 and MOSI=PA7 */
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_ALTFN_PUSHPULL,
+ GPIO5 | GPIO7 );
+
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO4);
+ gpio_set(GPIOA, GPIO4);
+
+ gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT,
+ GPIO6);
+
+ /* Reset SPI, SPI_CR1 register cleared, SPI is disabled */
+ spi_reset(SPI1);
+
+
+ /* Set up SPI in Master mode with:
+ * Clock baud rate: 1/64 of peripheral clock frequency
+ * Clock polarity: Idle Low
+ * Clock phase: Data valid on 1st clock pulse
+ * Data frame format: 8-bit
+ * Frame format: MSB First
+ */
+ spi_init_master(SPI1, SPI_CR1_BAUDRATE_FPCLK_DIV_64,
+ SPI_CR1_CPOL_CLK_TO_0_WHEN_IDLE,
+ SPI_CR1_CPHA_CLK_TRANSITION_1, SPI_CR1_DFF_8BIT, SPI_CR1_MSBFIRST);
+
+ /*
+ * Set NSS management to software.
+ *
+ * Note:
+ * Setting nss high is very important, even if we are controlling the GPIO
+ * ourselves this bit needs to be at least set to 1, otherwise the spi
+ * peripheral will not send any data out.
+ */
+ spi_enable_software_slave_management(SPI1);
+ spi_set_nss_high(SPI1);
+
+ /* Enable SPI1 periph. */
+ spi_enable(SPI1);
}
int main(void)
{
- int i;
-
+ clock_setup();
+ spi_setup();
gpio_setup();
+ SEGGER_RTT_WriteString(0, "SX1276 LoRa test\n");
+ SEGGER_RTT_printf(0, "CPU clk: %dHz\n", rcc_ahb_frequency);
+
+ struct sx1276_state_st *sx1276_state = sx1276_init(86520000);
+
+ sx1276_fifo_write(0x0, 0xde);
+ sx1276_fifo_write(0x1, 0xad);
+ sx1276_fifo_write(0x2, 0xbe);
+ sx1276_fifo_write(0x3, 0xef);
+
+ sx1276_write(SX1276_REG_PAYLOAD_LENGTH, 4);
+
+ sx1276_write(SX1276_REG_OP_MODE, SX1276_MODE_LONG_RANGE_MODE | SX1276_MODE_TX);
+
+ while (1) {
+ int ret = sx1276_read(SX1276_REG_OP_MODE);
+ SEGGER_RTT_printf(0, "MOD: 0x%02x ", ret);
+ ret = sx1276_read(SX1276_REG_MODEM_STATUS);
+ SEGGER_RTT_printf(0, "STAT: 0x%02x ", ret);
+ ret = sx1276_read(SX1276_REG_IRQ_FLAGS);
+ SEGGER_RTT_printf(0, "IRQ: 0x%02x\n", ret);
+ if (ret & (1<<3)){
+ break;
+ }
+ delay_ms(100);
+ }
+ SEGGER_RTT_printf(0, "Done\n");
+
+
/* Blink the LED (PA5) on the board. */
while (1) {
/* Using API function gpio_toggle(): */
gpio_toggle(GPIOB, GPIO1); /* LED on/off */
- SEGGER_RTT_WriteString(0, "Hello World\n");
- for (i = 0; i < 800000; i++) /* Wait a bit. */
- __asm__("nop");
+ delay_ms(500);
}
return 0;
diff --git a/src/sx1276.c b/src/sx1276.c
new file mode 100644
index 0000000..7cf289b
--- /dev/null
+++ b/src/sx1276.c
@@ -0,0 +1,117 @@
+#include
+#include
+
+#include
+#include "delay.h"
+#include "util.h"
+#include "sx1276.h"
+
+
+static uint8_t sx1276_spi_transaction(uint8_t reg, uint8_t val) {
+ uint8_t ret;
+ gpio_clear(SX1276_SS_PORT, SX1276_SS_PIN);
+ spi_send(SX1276_SPI, reg);
+ spi_read(SX1276_SPI);
+ spi_send(SX1276_SPI, val);
+ ret = spi_read(SX1276_SPI);
+ gpio_set(SX1276_SS_PORT, SX1276_SS_PIN);
+ return ret;
+}
+
+uint8_t sx1276_read(uint8_t reg) {
+ reg &= 0x7f; // clear upper bit to make it read request
+ return sx1276_spi_transaction(reg, 0x00);
+}
+
+uint8_t sx1276_write(uint8_t reg, uint8_t val) {
+ reg |= 0x80; // set upper bit to make it write request
+ return sx1276_spi_transaction(reg, val);
+}
+
+void sx1276_fifo_dump(struct sx1276_state_st *state) {
+ sx1276_write(SX1276_REG_FIFO_ADDR_PTR, 0x00);
+ gpio_clear(SX1276_SS_PORT, SX1276_SS_PIN);
+ spi_send(SX1276_SPI, SX1276_REG_FIFO & 0x7f); // read
+ spi_read(SX1276_SPI);
+ for (int i=0; i < FIFO_SIZE; i++){
+ spi_send(SX1276_SPI, 0x00);
+ int val = spi_read(SX1276_SPI);
+ state->fifo[i] = val;
+ }
+ gpio_set(GPIOA, GPIO4);
+}
+
+void sx1276_fifo_load(struct sx1276_state_st *state) {
+ sx1276_write(SX1276_REG_FIFO_ADDR_PTR, 0x00);
+ gpio_clear(SX1276_SS_PORT, SX1276_SS_PIN);
+ spi_send(SX1276_SPI, SX1276_REG_FIFO | 0x80); // write
+ spi_read(SX1276_SPI);
+ for (int i=0; i < FIFO_SIZE; i++){
+ spi_send(SX1276_SPI, state->fifo[i]);
+ spi_read(SX1276_SPI);
+ }
+ gpio_set(GPIOA, GPIO4);
+}
+
+void sx1276_fifo_write(uint8_t addr, uint8_t val) {
+ sx1276_write(SX1276_REG_FIFO_ADDR_PTR, addr);
+ sx1276_write(SX1276_REG_FIFO, val);
+}
+
+void sx1276_set_frequency(uint64_t frequency) {
+ uint64_t frf = ((uint64_t)frequency << 19) / 32000000;
+
+ sx1276_write(SX1276_REG_FRF_MSB, (uint8_t)(frf >> 16));
+ sx1276_write(SX1276_REG_FRF_MID, (uint8_t)(frf >> 8));
+ sx1276_write(SX1276_REG_FRF_LSB, (uint8_t)(frf >> 0));
+}
+
+struct sx1276_state_st *sx1276_init(uint64_t frequency) {
+ struct sx1276_state_st *sx1276_state = (struct sx1276_state_st*) malloc(sizeof(struct sx1276_state_st));
+ if (sx1276_state == NULL) {
+ return NULL;
+ }
+
+ SEGGER_RTT_printf(0, "SX1276: Reset\n");
+ gpio_clear(GPIOB, GPIO0);
+ delay_us(100);
+ gpio_set(GPIOB, GPIO0);
+ delay_ms(5);
+
+ uint8_t ret = sx1276_read(SX1276_REG_VERSION);
+// if (ret != 0x12) {
+// SEGGER_RTT_printf(0, "Invalid Chip Version, got: 0x%02x, expected: 0x12\n", ret);
+// //free(sx1276_state);
+// //return NULL;
+// }
+ SEGGER_RTT_printf(0, "Chip Version: 0x%02X\n", ret);
+
+ uint8_t set = SX1276_MODE_LONG_RANGE_MODE | SX1276_MODE_SLEEP;
+ ret = sx1276_write(SX1276_REG_OP_MODE, set);
+ SEGGER_RTT_printf(0, "Going to LoRa SLEEP from: 0x%02X, to: 0x%02X\n",
+ ret, set);
+
+ sx1276_set_frequency(frequency);
+
+ sx1276_write(SX1276_REG_FIFO_TX_BASE_ADDR, 0);
+ sx1276_write(SX1276_REG_FIFO_RX_BASE_ADDR, 0);
+
+ sx1276_write(SX1276_REG_LNA, 0b11000000); // minimum strenght
+ sx1276_write(SX1276_REG_PA_CONFIG, 1<<7); // minimum 2dBm
+
+ // Bw 7 125khz; CodingRate 1 4/5; implicit header mode
+ sx1276_write(SX1276_REG_MODEM_CONFIG_1, (7 << 4) | (1 << 1) | 1);
+ // SpreadingFactor 7 128 chips
+ sx1276_write(SX1276_REG_MODEM_CONFIG_2, (7 << 4));
+
+
+ set = SX1276_MODE_LONG_RANGE_MODE | SX1276_MODE_STDBY;
+ ret = sx1276_write(SX1276_REG_OP_MODE, set);
+ SEGGER_RTT_printf(0, "Going to LoRa STDBY from: 0x%02X, to: 0x%02x\n",
+ ret, set);
+
+
+ // We need to wait ~250us for TS_OSC to startup before we can access FIFO and some other things
+ delay_us(250);
+ return sx1276_state;
+};
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..5104b97
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,17 @@
+#include
+#include "util.h"
+
+void hexdump(char *buf, size_t size, uint32_t width) {
+ if (width == 0) {
+ width = 16;
+ }
+ SEGGER_RTT_SetFlagsUpBuffer(0, SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL);
+ for (unsigned int i = 0; i < size; i++) {
+ SEGGER_RTT_printf(0, "%.2x ", buf[i]);
+ if ((i+1) % width == 0) {
+ SEGGER_RTT_printf(0,"\n");
+ }
+ }
+ SEGGER_RTT_printf(0,"\n");
+ SEGGER_RTT_SetFlagsUpBuffer(0, SEGGER_RTT_MODE_DEFAULT);
+}