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enc28j60: Fix RCR command for MAC and MII registers

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The Read Control Register command requires that a dummy byte be read
before the register value for the MAC and MII registers.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
This commit is contained in:
Benoît Thébaudeau 2015-07-14 18:33:19 +02:00
parent 35544e81ee
commit 48f269e4f5
1 changed files with 26 additions and 2 deletions
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28
dev/enc28j60/enc28j60.c
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@ -113,6 +113,7 @@
#define MAADR4 0x03 /* MAADR<23:16> */
#define MAADR5 0x00 /* MAADR<15:8> */
#define MAADR6 0x01 /* MAADR<7:0> */
#define MISTAT 0x0a
#define EPKTCNT_BANK 0x01
#define ERXFCON 0x18
@ -128,10 +129,27 @@
PROCESS(enc_watchdog_process, "Enc28j60 watchdog");
static uint8_t initialized = 0;
static uint8_t bank = ERXTX_BANK;
static uint8_t enc_mac_addr[6];
static int received_packets = 0;
static int sent_packets = 0;
/*---------------------------------------------------------------------------*/
static uint8_t
is_mac_mii_reg(uint8_t reg)
{
/* MAC or MII register (otherwise, ETH register)? */
switch(bank) {
case MACONX_BANK:
return reg < EIE;
case MAADRX_BANK:
return reg <= MAADR2 || reg == MISTAT;
case ERXTX_BANK:
case EPKTCNT_BANK:
default:
return 0;
}
}
/*---------------------------------------------------------------------------*/
static uint8_t
readreg(uint8_t reg)
@ -139,6 +157,10 @@ readreg(uint8_t reg)
uint8_t r;
enc28j60_arch_spi_select();
enc28j60_arch_spi_write(0x00 | (reg & 0x1f));
if(is_mac_mii_reg(reg)) {
/* MAC and MII registers require that a dummy byte be read first. */
enc28j60_arch_spi_read();
}
r = enc28j60_arch_spi_read();
enc28j60_arch_spi_deselect();
return r;
@ -154,9 +176,10 @@ writereg(uint8_t reg, uint8_t data)
}
/*---------------------------------------------------------------------------*/
static void
setregbank(uint8_t bank)
setregbank(uint8_t new_bank)
{
writereg(ECON1, (readreg(ECON1) & 0xfc) | (bank & 0x03));
writereg(ECON1, (readreg(ECON1) & 0xfc) | (new_bank & 0x03));
bank = new_bank;
}
/*---------------------------------------------------------------------------*/
static void
@ -207,6 +230,7 @@ softreset(void)
/* The System Command (soft reset) is 1 1 1 1 1 1 1 1 */
enc28j60_arch_spi_write(0xff);
enc28j60_arch_spi_deselect();
bank = ERXTX_BANK;
}
/*---------------------------------------------------------------------------*/
static void