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chg: smartcard , testing to use pwm clock instead of timer clock.

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chg: added some comments
This commit is contained in:
iceman1001 2018-04-16 19:58:49 +02:00
commit a615fd6a9e
3 changed files with 30 additions and 8 deletions
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30
armsrc/smartcard.c
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@ -32,6 +32,9 @@
#define SMART_CARD_RECEIVE_BUFFER_SIZE (10)
#define SMART_CARD_TRANSMIT_BUFFER_SIZE (10)
#define SMART_CARD_CLOCK AT91C_BASE_PWMC_CH1
// true = the distance between a and b is greater than c
#define RANGE(a,b,c) ((MAX(a,b))-(MIN(a,b))>(c))
@ -235,7 +238,8 @@ static bool SMART_CARD_MaintainConnection( void ) {
*/
static void SMART_CARD_DisableClock( void ) {
// Disable TC2
AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKDIS;
//AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKDIS;
AT91C_BASE_PWMC->PWMC_DIS = PWM_CHANNEL(1);
generateClk = false;
}
@ -247,7 +251,8 @@ static void SMART_CARD_DisableClock( void ) {
*/
static void SMART_CARD_EnableClock( void ) {
// Enable and reset TC2
AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
//AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(1);
generateClk = true;
}
@ -462,6 +467,7 @@ static bool SMART_CARD_EstablishCommunications( void ) {
* @return void
*/
static void SMART_CARD_ConfigureClock( void ) {
/*
AT91C_BASE_PMC->PMC_PCER |= (1 << AT91C_ID_TC2); // Enable Clock TC2
AT91C_BASE_TCB->TCB_BMR &= AT91C_TCB_TC2XC2S; // Clear the external clock selection
@ -473,6 +479,22 @@ static void SMART_CARD_ConfigureClock( void ) {
| AT91C_TC_CPCTRG; // Capture Mode, reset the TC2 counter when RC is reached
AT91C_BASE_TC2->TC_RC = 12; // RC Compare value = 24MHz / 2MHz = 12
AT91C_BASE_TC2->TC_IER = AT91C_TC_CPCS; // Generate an interrupt when the RC value is reached
*/
// enable PWM Clock
AT91C_BASE_PMC->PMC_PCER |= (1 << AT91C_ID_PWMC);
// Enable channel1 as SMART CARD real-time clock
AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(1);
// 48 MHz / 16 gives 3MHz
SMART_CARD_CLOCK->PWMC_CMR = PWM_CH_MODE_PRESCALER(3); // Channel Mode Register
SMART_CARD_CLOCK->PWMC_CDTYR = 0; // Channel Duty Cycle Register
SMART_CARD_CLOCK->PWMC_CPRDR = 0xffff; // Channel Period Register
AT91C_BASE_PWMC->PWMC_IER = 1 << 1;
// AT91C_BASE_PWMC->PWMC_IDR; // disable interrupt
}
@ -673,14 +695,14 @@ void SmartCard_setup(void) {
}
void SmartCard_stop(void) {
StopTicks();
//StopTicks();
if ( MF_DBGLEVEL > 3 ) Dbprintf("Smart Card Stop");
LED_A_OFF();
}
bool SmartCard_init(void) {
StartTicks();
//StartTicks();
LED_A_ON();
SmartCard_setup();

6
armsrc/ticks.c
View file

@ -18,9 +18,9 @@ void SpinDelayUs(int us) {
AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
// 48 MHz / 1024 gives 46.875 kHz
AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10); // Channel Mode Register
AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0; // Channel Duty Cycle Register
AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff; // Channel Period Register
uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;