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- Add a driver for the Parallel Port based PowerOnReset In System Serial Programmer.
- ---
- prog/Makefile | 2
- prog/drv/ppporissp.c | 143 +++++++++++++++++++++++++++++++++++++++++++++++++++
- 2 files changed, 144 insertions(+), 1 deletion(-)
- --- m8cutils-22.orig/prog/Makefile
- +++ m8cutils-22/prog/Makefile
- @@ -8,7 +8,7 @@
- include ../Common.make
-
-
- -DRIVERS=waspic watsp watpp wadsp ecb_at91 dummy
- +DRIVERS=waspic watsp watpp wadsp ecb_at91 dummy ppporissp
- TESTS=rd errd ercmok ercmf wrrd wrcmok wrcmf wrlkcmok wrlkcmf wrlkrdf wrlkrdz \
- secu secf secr secw secfsrw secfsur secfsfw \
- secfspu secfspf secfspr secfspw secmir inrom inhex outrom outhex \
- --- /dev/null
- +++ m8cutils-22/prog/drv/ppporissp.c
- @@ -0,0 +1,143 @@
- +/*
- + * ppporissp.c - Parallel Port based PowerOnReset In System Serial Programmer
- + *
- + * Copyright (c) 2009 Michael Buesch <m@bues.ch>
- + * Derived from wadsp.c Copyright 2006 Werner Almesberger
- + * Derived from watpp.c Copyright 2006 Werner Almesberger
- + */
- +
- +#include <stdint.h>
- +#include <stdlib.h>
- +#include <stdio.h>
- +#include <unistd.h>
- +
- +#include "prog.h"
- +#include "pp.h"
- +
- +/*
- + * Programmer connections:
- + *
- + * Logical
- + * 1 0
- + * Data 0 (pin 2) SDATA to device SDATA !SDATA
- + * Data 1 (pin 3) SCLK to device SCLK !SCLK
- + * Data 2 (pin 4) Device power PWR !PWR
- + * Status 3 (pin 15) SDATA from device SDATA !SDATA
- + */
- +
- +#define PWR_TARGET(on) ((on) ? (data |= (1 << 2)) : (data &= ~(1 << 2)))
- +#define SCLK(on) ((on) ? (data |= (1 << 1)) : (data &= ~(1 << 1)))
- +#define SDATA_OUT(on) ((on) ? (data |= (1 << 0)) : (data &= ~(1 << 0)))
- +#define SDATA_IN() (!!(pp_read_status() & (1 << 3)))
- +#define COMMIT() pp_write_data(data)
- +
- +static int fd;
- +static int inverted;
- +static uint8_t data;
- +
- +
- +void delay_hook(int rising);
- +void __attribute__((weak)) delay_hook(int rising)
- +{
- +}
- +
- +static void ppporissp_send_bit(int bit)
- +{
- + SDATA_OUT(bit);
- + SCLK(1);
- + COMMIT();
- + delay_hook(1);
- + SCLK(0);
- + COMMIT();
- + delay_hook(0);
- +}
- +
- +static void ppporissp_send_z(void)
- +{
- + SDATA_OUT(0);
- + SCLK(!inverted);
- + COMMIT();
- + delay_hook(1);
- + SCLK(inverted);
- + COMMIT();
- + delay_hook(0);
- +}
- +
- +static int ppporissp_read_bit(void)
- +{
- + return SDATA_IN();
- +}
- +
- +static void ppporissp_invert_phase(void)
- +{
- + inverted = !inverted;
- + if (inverted) {
- + SCLK(1);
- + COMMIT();
- + }
- +}
- +
- +static struct prog_bit ppporissp_bit = {
- + .send_bit = ppporissp_send_bit,
- + .send_z = ppporissp_send_z,
- + .read_bit = ppporissp_read_bit,
- + .invert_phase = ppporissp_invert_phase,
- +};
- +
- +static void ppporissp_initialize(int power_on)
- +{
- + struct timeval t0;
- +
- + printf("Performing power-on-reset...\n");
- + PWR_TARGET(1);
- + COMMIT();
- + start_time(&t0);
- + /* This is much safer than usleep. */
- + while (delta_time_us(&t0) < T_VDDWAIT);
- +}
- +
- +static int ppporissp_open(const char *dev, int voltage, int power_on,
- + const char *args[])
- +{
- + prog_init(NULL, NULL, NULL, &ppporissp_bit);
- +
- + if (!power_on) {
- + fprintf(stderr, "ppporissp does not support XRES\n");
- + return -1;
- + }
- + if (voltage != 5)
- + printf("Warning: Not operating on 5V. Trying anyway...\n");
- +
- + fd = pp_open(dev, 0);
- +
- + inverted = 0;
- + PWR_TARGET(0);
- + SCLK(0);
- + SDATA_OUT(0);
- + COMMIT();
- + /*
- + * With the power off, we now wait for capacitors on the board to
- + * discharge. Using v(t) = v(0)*exp(-t/RC) and
- + * v(0) = 5V, R = 4.7kOhm, t = 100ms, we can discharge up to
- + * C = 10uF down to a diode drop of 0.6V.
- + */
- + printf("Waiting for device to power down...\n");
- + sleep(2); /* 2000 ms */
- +
- + return voltage;
- +}
- +
- +static void ppporissp_close(void)
- +{
- + SCLK(0);
- + PWR_TARGET(0);
- + COMMIT();
- + pp_close();
- +}
- +
- +struct prog_common ppporissp = {
- + .name = "ppporissp",
- + .open = ppporissp_open,
- + .close = ppporissp_close,
- + .initialize = ppporissp_initialize,
- +};
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