/* main_pwm - OpenPCD firmware for generating a PWM-modulated 13.56MHz * carrier * * To use this, you need to connect PIOA P0 with MFIN of the reader. * * (C) 2006 by Harald Welte * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include #include "../openpcd.h" #include #include #include #include #include #include #include #ifdef SSC #include #endif #define RAH NULL static u_int8_t force_100ask = 1; static u_int8_t mod_conductance = 0x3f; static u_int8_t cw_conductance = 0x3f; static u_int16_t duty_percent = 22; #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) static u_int32_t pwm_freq[] = { 105937, 211875, 423750, 847500 }; static u_int8_t pwm_freq_idx = 0; static void rc632_modulate_mfin() { opcd_rc632_reg_write(RAH, RC632_REG_TX_CONTROL, RC632_TXCTRL_MOD_SRC_MFIN|RC632_TXCTRL_TX2_INV| RC632_TXCTRL_TX1_RF_EN|RC632_TXCTRL_TX2_RF_EN); } /* (77/40) ^ EXPcsCfgCW */ /* 1, 1.925, 3.705625, 7.13332812 */ #define COND_MANT(x) (x & 0x0f) #define COND_EXP(x) ((x & 0x30) >> 4) static const u_int16_t rsrel_expfact[] = { 1000, 1925, 3706, 7133 }; static u_int32_t calc_conduct_rel(u_int8_t inp) { u_int32_t cond_rel; cond_rel = COND_MANT(inp) * rsrel_expfact[COND_EXP(inp)]; cond_rel = cond_rel / 1000; return cond_rel; } static const u_int8_t rsrel_table[] = { 0, 16, 32, 48, 1, 17, 2, 3, 33, 18, 4, 5, 19, 6, 7, 49, 34, 20, 8, 9, 21, 10, 11, 35, 22, 12, 13, 23, 14, 50, 36, 15, 24, 25, 37, 26, 27, 51, 38, 28, 29, 39, 30, 52, 31, 40, 41, 53, 42, 43, 54, 44, 45, 55, 46, 47, 56, 57, 58, 59, 60, 61, 62, 63 }; static const u_int16_t cdivs[] = { 128, 64, 32, 16 }; static int cdiv_idx = 0; static void help(void) { DEBUGPCR("o: decrease duty p: increase duty\r\n" "k: stop pwm l: start pwn\r\n" "n: decrease freq m: incresae freq\r\n" "v: decrease mod_cond b: increase mod_cond\r\n" "g: decrease cw_cond h: increase cw_cond"); DEBUGPCR("u: PA23 const 1 y: PA23 const 0\r\n" "t: PA23 PWM0 f: toggle Force100ASK\r\n" "{: decrease cdiv_idx }: increse cdiv idx"); } void _init_func(void) { DEBUGPCR("\r\n===> main_pwm <===\r\n"); help(); rc632_init(); DEBUGPCRF("turning on RF"); rc632_turn_on_rf(RAH); /* switch PA17 (connected to MFIN on board) to input */ AT91F_PIO_CfgInput(AT91C_BASE_PIOA, AT91C_PIO_PA17); DEBUGPCRF("Initializing carrier divider"); tc_cdiv_init(); DEBUGPCRF("Initializing PWM"); pwm_init(); pwm_freq_set(0, 105937); pwm_start(0); pwm_duty_set_percent(0, 22); /* 22% of 9.43uS = 2.07uS */ rc632_modulate_mfin(); #ifdef SSC DEBUGPCRF("Initializing SSC RX"); ssc_rx_init(); #endif } int _main_dbgu(char key) { switch (key) { case 'o': if (duty_percent >= 1) duty_percent--; pwm_duty_set_percent(0, duty_percent); break; case 'p': if (duty_percent <= 99) duty_percent++; pwm_duty_set_percent(0, duty_percent); break; case 'k': pwm_stop(0); break; case 'l': pwm_start(0); break; case 'n': if (pwm_freq_idx > 0) { pwm_freq_idx--; pwm_stop(0); pwm_freq_set(0, pwm_freq[pwm_freq_idx]); pwm_start(0); pwm_duty_set_percent(0, 22); /* 22% of 9.43uS = 2.07uS */ } break; case 'm': if (pwm_freq_idx < ARRAY_SIZE(pwm_freq)-1) { pwm_freq_idx++; pwm_stop(0); pwm_freq_set(0, pwm_freq[pwm_freq_idx]); pwm_start(0); pwm_duty_set_percent(0, 22); /* 22% of 9.43uS = 2.07uS */ } break; case 'u': DEBUGPCRF("PA23 output high"); AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, AT91C_PIO_PA23); AT91F_PIO_SetOutput(AT91C_BASE_PIOA, AT91C_PIO_PA23); break; case 'y': DEBUGPCRF("PA23 output low"); AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, AT91C_PIO_PA23); AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, AT91C_PIO_PA23); return 0; break; case 't': DEBUGPCRF("PA23 PeriphA (PWM)"); AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, AT91C_PA23_PWM0); return 0; break; case 'f': DEBUGPCRF("%sabling Force100ASK", force_100ask ? "Dis":"En"); if (force_100ask) { force_100ask = 0; opcd_rc632_clear_bits(RAH, RC632_REG_TX_CONTROL, RC632_TXCTRL_FORCE_100_ASK); } else { force_100ask = 1; opcd_rc632_set_bits(RAH, RC632_REG_TX_CONTROL, RC632_TXCTRL_FORCE_100_ASK); } return 0; break; case 'v': if (mod_conductance > 0) { mod_conductance--; opcd_rc632_reg_write(RAH, RC632_REG_MOD_CONDUCTANCE, rsrel_table[mod_conductance]); } break; case 'b': if (mod_conductance < 0x3f) { mod_conductance++; opcd_rc632_reg_write(RAH, RC632_REG_MOD_CONDUCTANCE, rsrel_table[mod_conductance]); } break; case 'g': if (cw_conductance > 0) { cw_conductance--; opcd_rc632_reg_write(RAH, RC632_REG_CW_CONDUCTANCE, rsrel_table[cw_conductance]); } break; case 'h': if (cw_conductance < 0x3f) { cw_conductance++; opcd_rc632_reg_write(RAH, RC632_REG_CW_CONDUCTANCE, rsrel_table[cw_conductance]); } break; case '?': help(); return 0; break; case '<': tc_cdiv_phase_inc(); break; case '>': tc_cdiv_phase_dec(); break; case '{': if (cdiv_idx > 0) cdiv_idx--; tc_cdiv_set_divider(cdivs[cdiv_idx]); break; case '}': if (cdiv_idx < ARRAY_SIZE(cdivs)-1) cdiv_idx++; tc_cdiv_set_divider(cdivs[cdiv_idx]); break; #ifdef SSC case 's': ssc_rx_start(); break; case 'S': ssc_rx_stop(); break; #endif default: return -EINVAL; } DEBUGPCR("pwm_freq=%u, duty_percent=%u, mod_cond=%u, cw_cond=%u tc_cdiv=%u", pwm_freq[pwm_freq_idx], duty_percent, mod_conductance, cw_conductance, cdivs[cdiv_idx]); return 0; } void _main_func(void) { /* first we try to get rid of pending to-be-sent stuff */ usb_out_process(); /* next we deal with incoming requests from USB EP1 (OUT) */ usb_in_process(); /* try unthrottling sources since we now are [more] likely to * have empty request contexts */ rc632_unthrottle(); #ifdef SSC ssc_rx_unthrottle(); #endif led_toggle(2); }