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SD Card change detection w/ debouncing

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This commit is contained in:
ikari 2011-02-08 00:57:16 +01:00
parent 0df364760a
commit 986e37ee06
2 changed files with 35 additions and 20 deletions
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11
src/sdnative.c
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@ -117,6 +117,8 @@ enum cmd_state { CMD_RSP = 0, CMD_RSPDAT, CMD_DAT };
int during_blocktrans = TRANS_NONE;
uint32_t last_block = 0;
volatile int sd_changed;
/**
* getbits - read value from bit buffer
* @buffer: pointer to the data buffer
@ -298,6 +300,7 @@ int send_command_fast(uint8_t* cmd, uint8_t* rsp, uint8_t* buf){
rsplen = 6;
waitbusy = 1;
break;
case 13:
case 17:
case 18:
dat = 1;
@ -825,8 +828,8 @@ DSTATUS disk_initialize(BYTE drv) __attribute__ ((weak, alias("sdn_initialize"))
void sdn_init(void) {
/* enable GPIO interrupt on SD detect pin, both edges */
NVIC_EnableIRQ(EINT3_IRQn);
SD_DT_INT_SETUP();
/* NVIC_EnableIRQ(EINT3_IRQn);
SD_DT_INT_SETUP(); */
/* disconnect SSP1 */
LPC_PINCON->PINSEL0 &= ~(BV(13) | BV(15) | BV(17) | BV(19));
/* prepare GPIOs */
@ -910,10 +913,14 @@ DRESULT disk_write(BYTE drv, const BYTE *buffer, DWORD sector, BYTE count) __att
/* Detect changes of SD card 0 */
void sdn_changed() {
if (sd_changed) {
printf("ch ");
if(SDCARD_DETECT) {
disk_state = DISK_CHANGED;
} else {
disk_state = DISK_REMOVED;
}
sd_changed = 0;
}
}

8
src/timer.c
View File

@ -6,6 +6,7 @@
#include "timer.h"
#include "clock.h"
#include "uart.h"
#include "sdnative.h"
/* bit definitions */
#define RITINT 0
@ -13,6 +14,7 @@
#define PCRIT 16
extern volatile int sd_changed;
volatile tick_t ticks;
volatile int wokefromrit;
@ -23,6 +25,12 @@ void __attribute__((weak,noinline)) SysTick_Hook(void) {
/* Systick interrupt handler */
void SysTick_Handler(void) {
ticks++;
static uint16_t sdch_state = 0;
sdch_state = (sdch_state << 1) | SDCARD_DETECT | 0xe000;
if((sdch_state == 0xf000) || (sdch_state == 0xefff)) {
sd_changed = 1;
}
sdn_changed();
SysTick_Hook();
}