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drivers/periph_spi: Add spi_transfer_u16_be() #20312

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Feb 12, 2024
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drivers/periph_spi: Add spi_transfer_u16_be() #20312

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87abafb
drivers/periph_spi: Add spi_transfer_u16_be()
maribu Jan 30, 2024
47280b3
drivers/w5100: make use of spi_transfer_u16_be()
maribu Jan 30, 2024
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21 changes: 20 additions & 1 deletion drivers/include/periph/spi.h
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Original file line number Diff line number Diff line change
Expand Up @@ -66,8 +66,8 @@
#ifndef PERIPH_SPI_H
#define PERIPH_SPI_H

#include <endian.h>
#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
Expand Down Expand Up @@ -430,6 +430,25 @@ uint8_t spi_transfer_reg(spi_t bus, spi_cs_t cs, uint8_t reg, uint8_t out);
void spi_transfer_regs(spi_t bus, spi_cs_t cs, uint8_t reg,
const void *out, void *in, size_t len);

/**
* @brief Transfer a 16 bit number in big endian byte order
*
* @param[in] bus SPI device to use
* @param[in] cs chip select pin/line to use, set to
* SPI_CS_UNDEF if chip select should not be
* handled by the SPI driver
* @param[in] cont if true, keep device selected after transfer
* @param[in] host_number number to transfer in host byte order
* @return The 16 bit number received in host byte order
*/
static inline uint16_t spi_transfer_u16_be(spi_t bus, spi_cs_t cs, bool cont, uint16_t host_number)
{
const uint16_t send = htobe16(host_number);
uint16_t receive;
spi_transfer_bytes(bus, cs, cont, &send, &receive, sizeof(receive));
return be16toh(receive);
}

#ifdef __cplusplus
}
#endif
Expand Down
8 changes: 1 addition & 7 deletions drivers/w5100/w5100.c
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Original file line number Diff line number Diff line change
Expand Up @@ -47,13 +47,7 @@ static const netdev_driver_t netdev_driver_w5100;

static inline void send_addr(w5100_t *dev, uint16_t addr)
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
spi_transfer_byte(dev->p.spi, dev->p.cs, true, (addr >> 8));
spi_transfer_byte(dev->p.spi, dev->p.cs, true, (addr & 0xff));
#else
spi_transfer_byte(dev->p.spi, dev->p.cs, true, (addr & 0xff));
spi_transfer_byte(dev->p.spi, dev->p.cs, true, (addr >> 8));
#endif
spi_transfer_u16_be(dev->p.spi, dev->p.cs, true, addr);
}

static uint8_t rreg(w5100_t *dev, uint16_t reg)
Expand Down
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