117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/spi.h>
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#include <SEGGER_RTT.h>
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#include <sx1276.h>
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#include "delay.h"
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#include "util.h"
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uint8_t FIFO[FIFO_SIZE] = {0};
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static void clock_setup(void)
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{
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rcc_clock_setup_pll(&rcc_hse_configs[RCC_CLOCK_HSE8_72MHZ]);
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rcc_periph_clock_enable(RCC_GPIOA);
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rcc_periph_clock_enable(RCC_GPIOB);
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rcc_periph_clock_enable(RCC_SPI1);
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}
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static void gpio_setup(void)
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{
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO0 | GPIO1);
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}
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static void spi_setup(void)
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{
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/* Configure GPIOs: SS=PA4, SCK=PA5, MISO=PA6 and MOSI=PA7 */
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_PUSHPULL,
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GPIO5 | GPIO7 );
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO4);
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gpio_set(GPIOA, GPIO4);
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gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT,
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GPIO6);
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/* Reset SPI, SPI_CR1 register cleared, SPI is disabled */
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spi_reset(SPI1);
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/* Set up SPI in Master mode with:
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* Clock baud rate: 1/64 of peripheral clock frequency
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* Clock polarity: Idle Low
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* Clock phase: Data valid on 1st clock pulse
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* Data frame format: 8-bit
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* Frame format: MSB First
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*/
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spi_init_master(SPI1, SPI_CR1_BAUDRATE_FPCLK_DIV_64,
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SPI_CR1_CPOL_CLK_TO_0_WHEN_IDLE,
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SPI_CR1_CPHA_CLK_TRANSITION_1, SPI_CR1_DFF_8BIT, SPI_CR1_MSBFIRST);
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/*
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* Set NSS management to software.
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*
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* Note:
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* Setting nss high is very important, even if we are controlling the GPIO
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* ourselves this bit needs to be at least set to 1, otherwise the spi
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* peripheral will not send any data out.
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*/
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spi_enable_software_slave_management(SPI1);
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spi_set_nss_high(SPI1);
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/* Enable SPI1 periph. */
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spi_enable(SPI1);
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}
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int main(void)
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{
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clock_setup();
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spi_setup();
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gpio_setup();
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SEGGER_RTT_WriteString(0, "SX1276 LoRa test\n");
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SEGGER_RTT_printf(0, "CPU clk: %dHz\n", rcc_ahb_frequency);
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struct sx1276_state_st *sx1276_state = sx1276_init(86520000);
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sx1276_fifo_write(0x0, 0xde);
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sx1276_fifo_write(0x1, 0xad);
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sx1276_fifo_write(0x2, 0xbe);
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sx1276_fifo_write(0x3, 0xef);
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sx1276_write(SX1276_REG_PAYLOAD_LENGTH, 4);
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sx1276_write(SX1276_REG_OP_MODE, SX1276_MODE_LONG_RANGE_MODE | SX1276_MODE_TX);
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while (1) {
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int ret = sx1276_read(SX1276_REG_OP_MODE);
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SEGGER_RTT_printf(0, "MOD: 0x%02x ", ret);
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ret = sx1276_read(SX1276_REG_MODEM_STATUS);
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SEGGER_RTT_printf(0, "STAT: 0x%02x ", ret);
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ret = sx1276_read(SX1276_REG_IRQ_FLAGS);
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SEGGER_RTT_printf(0, "IRQ: 0x%02x\n", ret);
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if (ret & (1<<3)){
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break;
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}
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delay_ms(100);
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}
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SEGGER_RTT_printf(0, "Done\n");
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/* Blink the LED (PA5) on the board. */
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while (1) {
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/* Using API function gpio_toggle(): */
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gpio_toggle(GPIOB, GPIO1); /* LED on/off */
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delay_ms(500);
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}
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return 0;
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}
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