benpicco-tmp

static bool flash_busy(void) {
	uint8_t cmd = CMD_RDSR;
	uint8_t data;
	spi_tx(config, &cmd, 1, &data , 1, 0);

	return data & STAT_BSY;
}

int flash_erase_block(uint32_t address, block_erase_t mode) {
	uint8_t cmd_buffer[4];

benpicco-tmp

static inline uint8_t spi_send(SPI_TypeDef* SPI, uint8_t data) {
    SPI->DR = data;

    while (!(SPI->SR & SPI_FLAG_TXE));

    while (!(SPI->SR & SPI_FLAG_RXNE));

    return SPI->DR;
}