spinn_srom.c File Reference

Serial ROM interface routines for Spinnaker. More...

#include "spinnaker.h"
#include "sark.h"

Enumerations
enum	spinn_srom_commands {   SROM_READ = (0x03U << 24) , SROM_WRITE = (0x02U << 24) , SROM_WREN = (0x06U << 24) , SROM_WRDI = (0x04U << 24) ,   SROM_RDSR = (0x05U << 24) , SROM_WRSR = (0x01U << 24) , SROM_PE = (0x42U << 24) , SROM_SE = (0xd8U << 24) ,   SROM_CE = (0xc7U << 24) , SROM_RDID = (0xabU << 24) , SROM_DPD = (0xb9U << 24) }
	Serial ROM command codes.
enum	spinn_srom_scp_flag_bits { WAIT = 0x40 , WREN = 0x80 , WRITE = 0x100 }
	Flag bits within the SCP message.

Functions
static void	ncs_low (void)
	Set the NCS line low.
static void	ncs_high (void)
	Set the NCS line high.
static void	clock (void)
	Cycle the clock line on the SROM.
static void	send (uint v, uint n)
	Send data to the SROM.
static uint	read8 (void)
	Read a byte from the SROM (must have been requested)
uint	cmd_srom (sdp_msg_t *msg)
	General purpose SROM interface routine.

Detailed Description

Serial ROM interface routines for Spinnaker.

Copyright

© The University of Manchester - 2009, 2010

Author

Steve Temple, APT Group, School of Computer Science

Function Documentation

send()

static void send ( uint  v, uint  n  )

static

Send data to the SROM.

Parameters

[in]	v	Value to send, in top n bits
[in]	n	Number of bits to send

read8()

static uint read8 ( void  )

static

Read a byte from the SROM (must have been requested)

Returns

The byte that was read.

cmd_srom()

uint cmd_srom

(

sdp_msg_t *

msg

)

General purpose SROM interface routine.

msg->arg1[31:16] = Data length (or zero)
msg->arg1[8] = Write (1) or Read (0)
msg->arg1[7] = Send WREN command first
msg->arg1[6] = Wait for completion
msg->arg1[5:0] = Number of command bits (8,16,32)
 
msg->arg2[31:24] = SROM command
msg->arg2[23:0] = extra command bits

Parameters

[in,out]

msg

SCP message describing what to do. Updated with response payload if relevant.

Returns

the length of the result message