D2000: how to connect the SPI to multiple slaves?

[JGarc41]

how to connect 4 SPI as slaves the D200?

Los pines SPI son SPI_M_SS[3:0]

but the F1_SPI_M_SS1 is connected to BATTMON_1P8V_REF, How can I use it?

how to connect the SPI to multiple slaves?  

[AZimi]

Hi,

Forget about SSx pins. You can use any other as Slave Select. Just need to initialize required GPIO and control it in your spi transfer functions.

For example:

# define sx1272_csn_enable() qm_gpio_clear_pin(QM_GPIO_0, CSN_SX1272)

# define sx1272_csn_disable() qm_gpio_set_pin(QM_GPIO_0, CSN_SX1272)

void writeRegister(uint8_t addr, uint8_t value)

{

qm_spi_transfer_t polled_xfer_desc;

qm_spi_status_t status;

uint8_t spi_buf[2];

uint8_t rx_buf[2];

spi_buf[0] = addr | 0x80;

spi_buf[1] = value;

polled_xfer_desc.tx = spi_buf;

polled_xfer_desc.rx = rx_buf;

polled_xfer_desc.tx_len = 2;

polled_xfer_desc.rx_len = 2;

sx1272_csn_enable(); //SS pin LOW

qm_spi_transfer(QM_SPI_MST_0, &polled_xfer_desc, &status);

sx1272_csn_disable(); //SS pin HIGH

}