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git://projects.qi-hardware.com/ben-wpan.git
synced 2024-12-23 05:58:38 +02:00
Next part of board bringup: reset and power cycling.
- atusd/ERRATA: one more problem: the transistor footprint is wrong - atusd/tools/lib/atusd.c (atusd_cycle, atusd_reset): added power cycling and hardware reset - atusd/tools/lib/atusd.h: be nice and make a header file - atusd/tools/try.c: be nice and use header files (caught a bug as well)
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@ -3,3 +3,6 @@
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- added wire connecting uSD-side ground plane to ground plane at outer edge,
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to improve CLK signal return. (Probably unnecessary, too.)
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- the footprint of the transistor (Q1) is reversed :-( It works after
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converting the chip from SOT to PLCC.
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@ -1,6 +1,7 @@
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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@ -102,7 +103,7 @@ struct atusd_dsc *atusd_open(void)
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void atusd_close(struct atusd_dsc *dsc)
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{
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/* stop the MMC clock */
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/* stop the MMC bus clock */
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MSC_STRPCL = 1;
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/* cut the power */
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@ -111,3 +112,52 @@ void atusd_close(struct atusd_dsc *dsc)
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/* make all MMC pins inputs */
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PDDIRC = MxSx | CLK | SCLK | SLP_TR | IRQ | nSEL;
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}
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void atusd_cycle(struct atusd_dsc *dsc)
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{
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/* stop the MMC bus clock */
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MSC_STRPCL = 1;
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/* drive all outputs low (including the MMC bus clock) */
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PDDATC = MxSx | CLK | SCLK | SLP_TR | nSEL;
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/* make the MMC bus clock a regular output */
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PDFUNC = CLK;
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/* cut the power */
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PDDATS = VDD_OFF;
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/* Power drains within about 20 ms. Wait 100 ms to be sure. */
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usleep(100*1000);
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/* drive nSS high */
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PDDATS = nSEL;
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/* supply power */
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PDDATS = VDD_OFF;
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/* return the bus clock output to the MMC controller */
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PDFUNS = CLK;
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/* start MMC clock output */
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MSC_STRPCL = 2;
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}
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void atusd_reset(struct atusd_dsc *dsc)
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{
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/* activate reset */
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PDDATS = SLP_TR;
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PDDATC = nSEL;
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/*
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* Data sheet says 625 ns, programmer's guide says 6 us. Whom do we
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* trust ?
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*/
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usleep(6);
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/* release reset */
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PDDATS = nSEL;
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PDDATC = SLP_TR;
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}
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7
atusd/tools/lib/atusd.h
Normal file
7
atusd/tools/lib/atusd.h
Normal file
@ -0,0 +1,7 @@
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struct atusd_dsc;
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struct atusd_dsc *atusd_open(void);
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void atusd_close(struct atusd_dsc *dsc);
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void atusd_cycle(struct atusd_dsc *dsc);
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void atusd_reset(struct atusd_dsc *dsc);
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@ -1,4 +1,7 @@
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struct atusd_dsc;
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#include <stdio.h>
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#include <unistd.h>
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#include "lib/atusd.h"
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int main(void)
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@ -7,7 +10,10 @@ int main(void)
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char tmp;
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dsc = atusd_open();
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read(1, tmp, 1);
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read(1, &tmp, 1);
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fprintf(stderr, "cycling\n");
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atusd_cycle(dsc);
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read(1, &tmp, 1);
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atusd_close(dsc);
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return 0;
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