How to increase SPI speed above 8 Mhz

RE: How to increase SPI speed above 8 Mhz

Hieu — Sun, 08 Sep 2024 14:19:46 GMT

SPIM3 is the peripheral instance that can run 32Mbps. I am not sure what you mean by "just initialize SPIM."

RE: How to increase SPI speed above 8 Mhz

vn2000 — Sun, 08 Sep 2024 08:15:37 GMT

In this case do I still need to initialize SPIM3? Or just initialize SPIM?

RE: How to increase SPI speed above 8 Mhz

Hieu — Tue, 27 Aug 2024 09:14:00 GMT

Hi vn2000,

What Hoang said is completely correct. I just want to add that you can also get a quick overview of the available peripherals and its maximum capabilities in the first page of the Product Specification, and more details in the dedicated peripheral page.

Hieu

RE: How to increase SPI speed above 8 Mhz

Nguyen Hoan Hoang — Tue, 27 Aug 2024 08:48:20 GMT

These defines are found in the nrf52840_bitfields.h. SPI freq for nrf52840 can go up to 32MHz

/* Bits 31..0 : SPI master data rate */

#define SPIM_FREQUENCY_FREQUENCY_Pos (0UL) /*!< Position of FREQUENCY field. */

#define SPIM_FREQUENCY_FREQUENCY_Msk (0xFFFFFFFFUL << SPIM_FREQUENCY_FREQUENCY_Pos) /*!< Bit mask of FREQUENCY field. */

#define SPIM_FREQUENCY_FREQUENCY_K125 (0x02000000UL) /*!< 125 kbps */

#define SPIM_FREQUENCY_FREQUENCY_K250 (0x04000000UL) /*!< 250 kbps */

#define SPIM_FREQUENCY_FREQUENCY_K500 (0x08000000UL) /*!< 500 kbps */

#define SPIM_FREQUENCY_FREQUENCY_M16 (0x0A000000UL) /*!< 16 Mbps */

#define SPIM_FREQUENCY_FREQUENCY_M1 (0x10000000UL) /*!< 1 Mbps */

#define SPIM_FREQUENCY_FREQUENCY_M32 (0x14000000UL) /*!< 32 Mbps */

#define SPIM_FREQUENCY_FREQUENCY_M2 (0x20000000UL) /*!< 2 Mbps */

#define SPIM_FREQUENCY_FREQUENCY_M4 (0x40000000UL) /*!< 4 Mbps */

#define SPIM_FREQUENCY_FREQUENCY_M8 (0x80000000UL) /*!< 8 Mbps */