8MHzE:\easy-pdk-programmer-software>easypdkprog.exe write -npfc161 E:\easy-pdk-programmer-software\Examples\src\build\helloworld_pfc161.ihx
Erasing IC... done.
Writing IC (184 words)... done.
Calibrating IC
* IHRC SYSCLK=8000000Hz @ 4.00V ... calibration result: 7945630Hz (0x7B) done.
1MHzE:\easy-pdk-programmer-software>easypdkprog.exe write -npfc161 E:\easy-pdk-programmer-software\Examples\src\build\comptest_pfc161.ihx
Erasing IC... done.
Writing IC (394 words)... done.
Calibrating IC
* IHRC SYSCLK=1000000Hz @ 5.00V ... calibration result: 786982Hz (0x29) out of range.
ERROR: Calibration failed
Example code// COMPARATOR test. VDD estimation using internal VBandGap (1.2V) reference, serial output of comparator results on PA7 at 19200 baud.
//
// We use 1MHz as sysclock so we can test with much lower VDD:
//
// easypdkprog start --runvdd=5.0
// easypdkprog start --runvdd=3.3
// easypdkprog start --runvdd=2.0
#include <stdint.h>
#include <stdio.h>
#include "easypdk/pdk.h"
volatile uint16_t txdata; //txdata, serial data shift register
void interrupt(void) __interrupt(0)
{
if( INTRQ & INTRQ_TM2 ) //TM2 interrupt request?
{
INTRQ &= ~INTRQ_TM2; //mark TM2 interrupt request processed
if( txdata ) //txdata contains bits to send?
{
if( txdata&1 ) //check bit (1/0) for sending
__set1io( PA, 7 ); //send 1 on PA7
else
__set0io( PA, 7 ); //send 0 on PA7
txdata >>= 1; //shift txdata
}
}
}
int putchar(int c)
{
while(txdata); //wait for completion of previous transmission
INTEN &= ~INTEN_TM2; //disable TM2 (setup of 16 bit value txdata is non atomic)
txdata = (c << 1) | 0x200; //setup txdata with start and stop bit
INTEN |= INTEN_TM2; //enable TM2
return (c);
}
unsigned char _sdcc_external_startup(void)
{
EASY_PDK_INIT_SYSCLOCK_1MHZ(); //use 1MHz sysclock
EASY_PDK_CALIBRATE_IHRC(1000000,5000); //tune SYSCLK to 1MHz @ 5.000V
EASY_PDK_USE_FACTORY_BGTR(); //use factory BandGap tuning value (tuned @ 5.0V)
return 0; //perform normal initialization
}
void main(void)
{
//setup timer2 (TM2) interrupt for 19200 baud
TM2C = TM2C_CLK_IHRC; //use IHRC -> 16 Mhz
TM2S = TM2S_PRESCALE_NONE | TM2S_SCALE_DIV8; //no prescale, scale 8 ~> 2MHz
TM2B = 104; //divide by 104 ~> 19230 Hz (apx. 19200)
PAC = 0x80; //enable PA.7 as output
txdata = 0xD55F; //setup 2 stop bits, 0x55 char for autobaud, 1 start bit, 5 stop bits
INTEN = INTEN_TM2; //enable TM2 interrupt, send out initial stop bits and autobaud char
__engint(); //enable global interrupts
//comparator VBandGap / VInt (case 3: VDD = [ 40 / (N+9) ] * 1.20 V ;
static const char vddcompstr[16][5] = {"5.33","4.80","4.36","4.00","3.69","3.43","3.20","3.00","2.82","2.67","2.53","2.40","2.29","2.18","2.09","2.00"};
//setup COMPARATOR: IN- = VBandGap, IN+ = VInt (selected by GPCS)
GPCC = GPCC_COMP_ENABLE | GPCC_COMP_MINUS_BANDGAP_1V2 | GPCC_COMP_PLUS_VINT_R;
for(;
{
puts("VDD is:");
for( uint8_t n=0; n<16; n++ ) //loop over all 16 values of the VInt_R resistor ladder
{
GPCS = GPCS_COMP_CASE3 | n; //case 3 covers 2.0V - 5.33V
for(uint32_t d=100; d>0; d--); //small delay after GPCS setup required
if( GPCC & GPCC_COMP_RESULT_POSITIV ) //test if comparator result is positiv
putchar('>');
else
putchar('<');
puts(vddcompstr[n]); //output the coresponding VDD value (we use a string table to avoid printf)
}
for(uint32_t i=180000; i>0; i--); //wait approx. 3s
}
}
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