90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
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* This file is part of the Black Magic Debug project.
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*
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* Copyright (C) 2011 Black Sphere Technologies Ltd.
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* Written by Gareth McMullin <gareth@blacksphere.co.nz>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* This file implements the low-level JTAG TAP interface. */
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#include <stdio.h>
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#include "general.h"
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#include "jtagtap.h"
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int jtagtap_init(void)
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{
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/* This needs some fixing... */
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/* Toggle required to sort out line drivers... */
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gpio_port_write(GPIOA, 0x8100);
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gpio_port_write(GPIOB, 0x2000);
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gpio_port_write(GPIOA, 0x8180);
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gpio_port_write(GPIOB, 0x2002);
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gpio_set_mode(JTAG_PORT, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, TMS_PIN);
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/* Go to JTAG mode for SWJ-DP */
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for(int i = 0; i <= 50; i++) jtagtap_next(1, 0); /* Reset SW-DP */
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jtagtap_tms_seq(0xE73C, 16); /* SWD to JTAG sequence */
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jtagtap_soft_reset();
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return 0;
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}
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void jtagtap_reset(void)
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{
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volatile int i;
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gpio_clear(GPIOB, GPIO1);
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for(i = 0; i < 10000; i++) asm("nop");
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gpio_set(GPIOB, GPIO1);
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jtagtap_soft_reset();
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}
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void jtagtap_srst(void)
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{
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volatile int i;
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gpio_set(GPIOA, GPIO2);
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for(i = 0; i < 10000; i++) asm("nop");
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gpio_clear(GPIOA, GPIO2);
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}
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inline uint8_t jtagtap_next(uint8_t dTMS, uint8_t dTDO)
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{
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uint8_t ret;
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gpio_set_val(JTAG_PORT, TMS_PIN, dTMS);
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gpio_set_val(JTAG_PORT, TDI_PIN, dTDO);
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gpio_set(JTAG_PORT, TCK_PIN);
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ret = gpio_get(JTAG_PORT, TDO_PIN);
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gpio_clear(JTAG_PORT, TCK_PIN);
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DEBUG("jtagtap_next(TMS = %d, TDO = %d) = %d\n", dTMS, dTDO, ret);
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return ret;
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}
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#define PROVIDE_GENERIC_JTAGTAP_TMS_SEQ
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#define PROVIDE_GENERIC_JTAGTAP_TDI_TDO_SEQ
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#define PROVIDE_GENERIC_JTAGTAP_TDI_SEQ
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#include "jtagtap_generic.c"
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