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Finer resolution for the PLL

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@3646 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2003-05-03 23:56:51 +00:00
parent 23b0fdaca1
commit 93e47b922f
1 changed files with 5 additions and 4 deletions
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9
apps/recorder/radio.c
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@ -33,6 +33,7 @@
#define MAX_FREQ (110000000)
#define MIN_FREQ (80000000)
#define PLL_FREQ_STEP 10000
#define FREQ_STEP 100000
static int curr_freq = 99400000;
@ -46,7 +47,7 @@ void fm_set_frequency(int freq)
** by 2.
*/
pll_cnt = (freq + 10700000) / 50000 / 2;
pll_cnt = (freq + 10700000) / (PLL_FREQ_STEP/2) / 2;
/* 0x100000 == FM mode
** 0x000002 == Microprocessor controlled Mute
@ -76,7 +77,7 @@ bool radio_screen(void)
mas_codec_writereg(6, 0x4000);
fmradio_set(2, 0x108884); /* 50kHz, 7.2MHz crystal */
fmradio_set(2, 0x140884); /* 5kHz, 7.2MHz crystal */
fm_set_frequency(curr_freq);
while(!done)
@ -133,7 +134,7 @@ bool radio_screen(void)
break;
case BUTTON_LEFT:
curr_freq -= 100000;
curr_freq -= FREQ_STEP;
if(curr_freq < MIN_FREQ)
curr_freq = MIN_FREQ;
@ -142,7 +143,7 @@ bool radio_screen(void)
break;
case BUTTON_RIGHT:
curr_freq += 100000;
curr_freq += FREQ_STEP;
if(curr_freq > MAX_FREQ)
curr_freq = MAX_FREQ;