electronut

Conway64 conway(&hspi2);

int main(void)
{

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* Configure the system clock */
  SystemClock_Config();

electronut

$ tree -L 2
.
├── Debug
├── Drivers
│   ├── CMSIS
│   └── STM32F1xx_HAL_Driver
├── Inc
│   ├── FreeRTOSConfig.h
│   ├── main.h
│   ├── stm32f1xx_hal_conf.h

electronut

volatile uint8_t g_demo_mode = 0;
volatile bool g_i2s_start = true;
volatile bool g_i2s_running = false;

static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
    switch(p_data[0]) {
        case '1':
        {
            g_demo_mode = 0;

electronut

for (;;)
    {
        // start I2S
        if(g_i2s_start && !g_i2s_running) {
            err_code = nrf_drv_i2s_start(0, m_buffer_tx, I2S_BUFFER_SIZE, 0);
            APP_ERROR_CHECK(err_code);
            g_i2s_running = true;
        }

        // stop I2S

electronut

uint32_t caclChannelValue(uint8_t level)
{
    uint32_t val = 0;

    // 0 
    if(level == 0) {
        val = 0x88888888;
    }
    // 255
    else if (level == 255) {

electronut

void set_led_data()
{
    for(int i = 0; i < 3*NLEDS; i += 3) {
        if (i == 3*nled) {
            switch(g_demo_mode) 
            {
                case 0:
                {
                    m_buffer_tx[i] = 0x88888888;
                    m_buffer_tx[i+1] = caclChannelValue(128);

electronut

#define NLEDS 16
#define RESET_BITS 6
#define I2S_BUFFER_SIZE 3*NLEDS + RESET_BITS

static uint32_t m_buffer_tx[I2S_BUFFER_SIZE];
static volatile int nled = 1;

electronut

// This is the I2S data handler - all data exchange related to the I2S transfers
// is done here.
static void data_handler(uint32_t const * p_data_received,
                         uint32_t       * p_data_to_send,
                         uint16_t         number_of_words)
{
    // Non-NULL value in 'p_data_to_send' indicates that the driver needs
    // a new portion of data to send.
    if (p_data_to_send != NULL)
    {

electronut

nrf_drv_i2s_config_t config = NRF_DRV_I2S_DEFAULT_CONFIG;
config.sdin_pin  = I2S_SDIN_PIN;
config.sdout_pin = I2S_SDOUT_PIN;
config.mck_setup = NRF_I2S_MCK_32MDIV10; ///< 32 MHz / 10 = 3.2 MHz.
config.ratio     = NRF_I2S_RATIO_32X;    ///< LRCK = MCK / 32.
config.channels  = NRF_I2S_CHANNELS_STEREO;

err_code = nrf_drv_i2s_init(&config, data_handler);
APP_ERROR_CHECK(err_code);

electronut

# constant
pow_16 = 65536.0

# decode temperature
def decodeT(temp_val):
    return ((temp_val / pow_16) * 165 - 40)

# decode humidity
def decodeH(humid_val):
    return ((humid_val / pow_16) * 100)