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/* 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.
*/
#include <errno.h>
#include <string.h>
#include <lib_AT91SAM7.h>
#include "rc632.h"
#include "dbgu.h"
#include "led.h"
#include "pwm.h"
static u_int8_t force_100ask = 0;
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()
{
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 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 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 void help(void)
{
DEBUGPCRF("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\r\n");
DEBUGPCRF("u: PA0 const 1 y: PA0 const 0\r\n"
"t: PA0 PWM0 f: toggle Force100ASK");
}
void _init_func(void)
{
DEBUGPCRF("\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);
pwm_init();
rc632_modulate_mfin();
pwm_freq_set(0, 105937);
pwm_start(0);
pwm_duty_set_percent(0, 22); /* 22% of 9.43uS = 2.07uS */
}
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("PA0 output high");
AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, AT91C_PIO_PA0);
AT91F_PIO_SetOutput(AT91C_BASE_PIOA, AT91C_PIO_PA0);
break;
case 'y':
DEBUGPCRF("PA0 output low");
AT91F_PIO_CfgOutput(AT91C_BASE_PIOA, AT91C_PIO_PA0);
AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, AT91C_PIO_PA0);
return 0;
break;
case 't':
DEBUGPCRF("PA0 PeriphA (PWM)");
AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, AT91C_PA0_PWM0, 0);
return 0;
break;
case 'f':
DEBUGPCRF("%sabling Force100ASK", force_100ask ? "Dis":"En");
if (force_100ask) {
force_100ask = 0;
rc632_clear_bits(RAH, RC632_REG_TX_CONTROL,
RC632_TXCTRL_FORCE_100_ASK);
} else {
force_100ask = 1;
rc632_set_bits(RAH, RC632_REG_TX_CONTROL,
RC632_TXCTRL_FORCE_100_ASK);
}
return 0;
break;
case 'v':
if (mod_conductance > 0) {
mod_conductance--;
rc632_reg_write(RAH, RC632_REG_MOD_CONDUCTANCE,
rsrel_table[mod_conductance]);
}
break;
case 'b':
if (mod_conductance < 0x3f) {
mod_conductance++;
rc632_reg_write(RAH, RC632_REG_MOD_CONDUCTANCE,
rsrel_table[mod_conductance]);
}
break;
case 'g':
if (cw_conductance > 0) {
cw_conductance--;
rc632_reg_write(RAH, RC632_REG_CW_CONDUCTANCE,
rsrel_table[cw_conductance]);
}
break;
case 'h':
if (cw_conductance < 0x3f) {
cw_conductance++;
rc632_reg_write(RAH, RC632_REG_CW_CONDUCTANCE,
rsrel_table[cw_conductance]);
}
break;
case '?':
help();
return 0;
break;
default:
return -EINVAL;
}
DEBUGPCRF("pwm_freq=%u, duty_percent=%u, mod_conductance=%u, cw_conductance=%u",
pwm_freq[pwm_freq_idx], duty_percent, mod_conductance, cw_conductance);
return 0;
}
void _main_func(void)
{
led_toggle(2);
}
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