277 lines
6.6 KiB
C
277 lines
6.6 KiB
C
/* main_pwm - OpenPCD firmware for generating a PWM-modulated 13.56MHz
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* carrier
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*
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* To use this, you need to connect PIOA P0 with MFIN of the reader.
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*
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* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <errno.h>
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#include <string.h>
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#include <lib_AT91SAM7.h>
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#include "../openpcd.h"
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#include <pcd/rc632.h>
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#include <os/dbgu.h>
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#include <os/led.h>
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#include <os/pwm.h>
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#include <os/tc_cdiv.h>
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#include <os/pcd_enumerate.h>
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#include <os/usb_handler.h>
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#ifdef SSC
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#include <pcd/ssc.h>
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#endif
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#define RAH NULL
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static uint8_t force_100ask = 1;
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static uint8_t mod_conductance = 0x3f;
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static uint8_t cw_conductance = 0x3f;
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static uint16_t duty_percent = 22;
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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static uint32_t pwm_freq[] = { 105937, 211875, 423750, 847500 };
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static uint8_t pwm_freq_idx = 0;
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static void rc632_modulate_mfin()
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{
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opcd_rc632_reg_write(RAH, RC632_REG_TX_CONTROL,
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RC632_TXCTRL_MOD_SRC_MFIN|RC632_TXCTRL_TX2_INV|
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RC632_TXCTRL_TX1_RF_EN|RC632_TXCTRL_TX2_RF_EN);
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}
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/* (77/40) ^ EXPcsCfgCW */
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/* 1, 1.925, 3.705625, 7.13332812 */
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#define COND_MANT(x) (x & 0x0f)
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#define COND_EXP(x) ((x & 0x30) >> 4)
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static const uint16_t rsrel_expfact[] = { 1000, 1925, 3706, 7133 };
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static uint32_t calc_conduct_rel(uint8_t inp)
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{
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uint32_t cond_rel;
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cond_rel = COND_MANT(inp) * rsrel_expfact[COND_EXP(inp)];
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cond_rel = cond_rel / 1000;
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return cond_rel;
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}
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static const uint8_t rsrel_table[] = {
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0, 16, 32, 48, 1, 17, 2, 3, 33, 18, 4, 5, 19, 6, 7, 49, 34, 20,
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8, 9, 21, 10, 11, 35, 22, 12, 13, 23, 14, 50, 36, 15, 24, 25,
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37, 26, 27, 51, 38, 28, 29, 39, 30, 52, 31, 40, 41, 53, 42, 43,
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54, 44, 45, 55, 46, 47, 56, 57, 58, 59, 60, 61, 62, 63 };
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static const uint16_t cdivs[] = { 128, 64, 32, 16 };
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static int cdiv_idx = 0;
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static void help(void)
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{
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DEBUGPCR("o: decrease duty p: increase duty\r\n"
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"k: stop pwm l: start pwn\r\n"
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"n: decrease freq m: incresae freq\r\n"
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"v: decrease mod_cond b: increase mod_cond\r\n"
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"g: decrease cw_cond h: increase cw_cond");
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DEBUGPCR("u: PA23 const 1 y: PA23 const 0\r\n"
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"t: PA23 PWM0 f: toggle Force100ASK\r\n"
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"{: decrease cdiv_idx }: increse cdiv idx");
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}
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void _init_func(void)
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{
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DEBUGPCR("\r\n===> main_pwm <===\r\n");
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help();
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rc632_init();
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DEBUGPCRF("turning on RF");
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rc632_turn_on_rf(RAH);
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/* switch PA17 (connected to MFIN on board) to input */
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AT91F_PIO_CfgInput(AT91C_BASE_PIOA, AT91C_PIO_PA17);
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DEBUGPCRF("Initializing carrier divider");
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tc_cdiv_init();
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DEBUGPCRF("Initializing PWM");
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pwm_init();
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pwm_freq_set(0, 105937);
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pwm_start(0);
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pwm_duty_set_percent(0, 22); /* 22% of 9.43uS = 2.07uS */
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rc632_modulate_mfin();
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#ifdef SSC
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DEBUGPCRF("Initializing SSC RX");
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ssc_rx_init();
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#endif
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}
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int _main_dbgu(char key)
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{
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switch (key) {
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case 'o':
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if (duty_percent >= 1)
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duty_percent--;
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pwm_duty_set_percent(0, duty_percent);
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break;
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case 'p':
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if (duty_percent <= 99)
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duty_percent++;
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pwm_duty_set_percent(0, duty_percent);
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break;
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case 'k':
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pwm_stop(0);
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break;
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case 'l':
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pwm_start(0);
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break;
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case 'n':
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if (pwm_freq_idx > 0) {
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pwm_freq_idx--;
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pwm_stop(0);
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pwm_freq_set(0, pwm_freq[pwm_freq_idx]);
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pwm_start(0);
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pwm_duty_set_percent(0, 22); /* 22% of 9.43uS = 2.07uS */
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}
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break;
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case 'm':
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if (pwm_freq_idx < ARRAY_SIZE(pwm_freq)-1) {
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pwm_freq_idx++;
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pwm_stop(0);
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pwm_freq_set(0, pwm_freq[pwm_freq_idx]);
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pwm_start(0);
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pwm_duty_set_percent(0, 22); /* 22% of 9.43uS = 2.07uS */
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}
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break;
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case 'u':
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DEBUGPCRF("PA23 output high");
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AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, AT91C_PIO_PA23);
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AT91F_PIO_SetOutput(AT91C_BASE_PIOA, AT91C_PIO_PA23);
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break;
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case 'y':
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DEBUGPCRF("PA23 output low");
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AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, AT91C_PIO_PA23);
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AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, AT91C_PIO_PA23);
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return 0;
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break;
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case 't':
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DEBUGPCRF("PA23 PeriphA (PWM)");
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AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, AT91C_PA23_PWM0);
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return 0;
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break;
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case 'f':
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DEBUGPCRF("%sabling Force100ASK", force_100ask ? "Dis":"En");
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if (force_100ask) {
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force_100ask = 0;
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opcd_rc632_clear_bits(RAH, RC632_REG_TX_CONTROL,
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RC632_TXCTRL_FORCE_100_ASK);
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} else {
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force_100ask = 1;
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opcd_rc632_set_bits(RAH, RC632_REG_TX_CONTROL,
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RC632_TXCTRL_FORCE_100_ASK);
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}
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return 0;
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break;
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case 'v':
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if (mod_conductance > 0) {
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mod_conductance--;
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opcd_rc632_reg_write(RAH, RC632_REG_MOD_CONDUCTANCE,
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rsrel_table[mod_conductance]);
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}
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break;
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case 'b':
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if (mod_conductance < 0x3f) {
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mod_conductance++;
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opcd_rc632_reg_write(RAH, RC632_REG_MOD_CONDUCTANCE,
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rsrel_table[mod_conductance]);
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}
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break;
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case 'g':
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if (cw_conductance > 0) {
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cw_conductance--;
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opcd_rc632_reg_write(RAH, RC632_REG_CW_CONDUCTANCE,
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rsrel_table[cw_conductance]);
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}
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break;
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case 'h':
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if (cw_conductance < 0x3f) {
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cw_conductance++;
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opcd_rc632_reg_write(RAH, RC632_REG_CW_CONDUCTANCE,
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rsrel_table[cw_conductance]);
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}
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break;
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case '?':
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help();
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return 0;
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break;
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case '<':
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tc_cdiv_phase_inc();
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break;
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case '>':
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tc_cdiv_phase_dec();
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break;
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case '{':
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if (cdiv_idx > 0)
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cdiv_idx--;
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tc_cdiv_set_divider(cdivs[cdiv_idx]);
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break;
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case '}':
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if (cdiv_idx < ARRAY_SIZE(cdivs)-1)
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cdiv_idx++;
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tc_cdiv_set_divider(cdivs[cdiv_idx]);
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break;
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#ifdef SSC
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case 's':
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ssc_rx_start();
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break;
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case 'S':
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ssc_rx_stop();
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break;
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#endif
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default:
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return -EINVAL;
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}
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DEBUGPCR("pwm_freq=%u, duty_percent=%u, mod_cond=%u, cw_cond=%u tc_cdiv=%u",
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pwm_freq[pwm_freq_idx], duty_percent, mod_conductance, cw_conductance,
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cdivs[cdiv_idx]);
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return 0;
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}
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void _main_func(void)
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{
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/* first we try to get rid of pending to-be-sent stuff */
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usb_out_process();
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/* next we deal with incoming requests from USB EP1 (OUT) */
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usb_in_process();
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/* try unthrottling sources since we now are [more] likely to
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* have empty request contexts */
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rc632_unthrottle();
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#ifdef SSC
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ssc_rx_unthrottle();
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#endif
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led_toggle(2);
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}
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