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*----------------------------------------------------------------------------
* RL-ARM - FlashFS
*----------------------------------------------------------------------------
* Name: SPI_LPC17xx.c
* Purpose: Serial Peripheral Interface Driver for NXP LPC17xx
* Rev.: V4.20
*----------------------------------------------------------------------------
* This code is part of the RealView Run-Time Library.
* Copyright (c) 2004-2011 KEIL - An ARM Company. All rights reserved.
*---------------------------------------------------------------------------*/
#include <File_Config.h>
#include <LPC17xx.H> /* LPC17xx Definitions */
/*----------------------------------------------------------------------------
SPI Driver instance definition
spi0_drv: First SPI driver
spi1_drv: Second SPI driver
*---------------------------------------------------------------------------*/
#define __DRV_ID spi0_drv
#define __PCLK 100000000
/* SPI Driver Interface functions */
static BOOL Init (void);
static BOOL UnInit (void);
static U8 Send (U8 outb);
static BOOL SendBuf (U8 *buf, U32 sz);
static BOOL RecBuf (U8 *buf, U32 sz);
static BOOL BusSpeed (U32 kbaud);
static BOOL SetSS (U32 ss);
static U32 CheckMedia (void); /* Optional function for SD card check */
/* SPI Device Driver Control Block */
SPI_DRV __DRV_ID = {
Init,
UnInit,
Send,
SendBuf,
RecBuf,
BusSpeed,
SetSS,
CheckMedia /* Can be NULL if not existing */
};
/* SSPxSR - bit definitions. */
#define TFE 0x01
#define TNF 0x02
#define RNE 0x04
#define RFF 0x08
#define BSY 0x10
/*--------------------------- Init ------------------------------------------*/
static BOOL Init (void) {
/* Initialize and enable the SSP Interface module. */
LPC_SC->PCONP |= (1 << 21); /* Enable power to SSPI0 block */
/* SSEL is GPIO, output set to high. */
LPC_GPIO1->FIODIR |= (1<<21); /* P1.21 is output */
LPC_GPIO1->FIOPIN |= (1<<21); /* set P1.21 high (SSEL inact.)*/
LPC_PINCON->PINSEL3 &= ~(0<<10); /* P1.21 SSEL (used as GPIO) */
/* P3.26 is SD Card Power Supply Enable Pin */
//LPC_GPIO3->FIODIR |= (1<<26); /* P3.26 is output */
//LPC_GPIO3->FIOPIN &= ~(1<<26); /* set P3.26 low(enable power) */
/* SCK, MISO, MOSI are SSP pins. */
LPC_PINCON->PINSEL3 &= ~(3UL<<8); /* P1.20 cleared */
LPC_PINCON->PINSEL3 |= (3UL<<8); /* P1.20 SCK0 */
LPC_PINCON->PINSEL3 &= ~((3<<14) | (3<<16)); /* P1.23, P1.24 cleared */
LPC_PINCON->PINSEL3 |= ((3<<14) | (3<<16)); /* P1.23 MISO0, P1.24 MOSI0 */
LPC_SC->PCLKSEL1 &= ~(3<<10); /* PCLKSP0 = CCLK/4 ( 25MHz) */
LPC_SC->PCLKSEL1 |= (1<<10); /* PCLKSP0 = CCLK (100MHz) */
LPC_SSP0->CPSR = 250; /* 100MHz / 250 = 400kBit */
/* maximum of 18MHz is possible*/
LPC_SSP0->CR0 = 0x0007; /* 8Bit, CPOL=0, CPHA=0 */
LPC_SSP0->CR1 = 0x0002; /* SSP0 enable, master */
return (__TRUE);
}
/*--------------------------- UnInit ----------------------------------------*/
static BOOL UnInit (void) {
/* Return SSP interface to default state. */
LPC_GPIO1->FIODIR &= ~(1<<21); /* P0.16 is input */
LPC_PINCON->PINSEL3 &= ~(3<<10); /* P0.16 SSEL (used as GPIO) */
LPC_PINCON->PINSEL3 &= ~(3UL<<8); /* P0.15 GPIO port 0.15 */
LPC_PINCON->PINSEL3 &= ~((3<<14) | (3<<16)); /* P0.17 and P0.18 GPIO */
LPC_SC->PCLKSEL1 &= ~(3<<10); /* PCLKSP0 = CCLK/4 ( 25MHz) */
LPC_SSP0->CPSR &= ~0xFF;
LPC_SSP0->CR0 &= ~0xFFFF;
LPC_SSP0->CR1 &= ~0x0F;
return (__TRUE);
}
/*--------------------------- Send ------------------------------------------*/
static U8 Send (U8 outb) {
/* Write and Read a byte on SPI interface. */
LPC_SSP0->DR = outb;
while (LPC_SSP0->SR & BSY); /* Wait for transfer to finish */
return (LPC_SSP0->DR); /* Return received value */
}
/*--------------------------- SendBuf ---------------------------------------*/
static BOOL SendBuf (U8 *buf, U32 sz) {
/* Send buffer to SPI interface. */
U32 i;
for (i = 0; i < sz; i++) {
LPC_SSP0->DR = buf[i];
/* Wait if Tx FIFO is full. */
while (!(LPC_SSP0->SR & TNF));
LPC_SSP0->DR;
}
/* Wait until Tx finished, drain Rx FIFO. */
while (LPC_SSP0->SR & (BSY | RNE)) {
LPC_SSP0->DR;
}
return (__TRUE);
}
/*--------------------------- RecBuf ----------------------------------------*/
static BOOL RecBuf (U8 *buf, U32 sz) {
/* Receive SPI data to buffer. */
U32 i;
for (i = 0; i < sz; i++) {
LPC_SSP0->DR = 0xFF;
/* Wait while Rx FIFO is empty. */
while (!(LPC_SSP0->SR & RNE));
buf[i] = LPC_SSP0->DR;
}
return (__TRUE);
}
/*--------------------------- BusSpeed --------------------------------------*/
static BOOL BusSpeed (U32 kbaud) {
/* Set an SPI clock to required baud rate. */
U32 div;
div = (__PCLK/1000 + kbaud - 1) / kbaud;
if (div == 0) div = 0x02;
if (div & 1) div++;
if (div > 0xFE) div = 0xFE;
LPC_SSP0->CPSR = div;
return (__TRUE);
}
/*--------------------------- SetSS -----------------------------------------*/
static BOOL SetSS (U32 ss) {
/* Enable/Disable SPI Chip Select (drive it high or low). */
if (ss) {
/* SSEL is GPIO, output set to high. */
LPC_GPIO1->FIOSET = 1<<21;
}
else {
/* SSEL is GPIO, output set to low. */
LPC_GPIO1->FIOCLR = 1<<21;
}
return (__TRUE);
}
/*--------------------------- CheckMedia ------------------------------------*/
static U32 CheckMedia (void) {
/* Read CardDetect and WriteProtect SD card socket pins. */
U32 stat = 0;
stat |= M_INSERTED;
return (stat);
}
/*----------------------------------------------------------------------------
* end of file
*---------------------------------------------------------------------------*/
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