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git://projects.qi-hardware.com/ben-blinkenlights.git
synced 2024-12-24 05:19:55 +02:00
Cleaned up bbl.c and added comments.
- bbl/bbl.c: PD* macros now contain the REG(), making their use easier - bbl/bbl.c: added description of the XBurst set/clear concept - bbl/bbl.c: added comments all over the place
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bbl/bbl.c
67
bbl/bbl.c
@ -19,42 +19,55 @@
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#include <sys/mman.h>
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#define PDDATS 0x10010314
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#define PDDATC 0x10010318
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#define PDFUNC 0x10010348
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#define PDDIRS 0x10010364
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#define PDDIRC 0x10010368
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#define GPIO_BASE 0x10010000
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#define LEDS 10
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#define REG(n) (*(uint32_t *) (mem+(n)-GPIO_BASE))
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#define LED_MASK 0x3f00
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#define LED_SEL 11
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/*
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* The XBurst CPUs use an interesting concept for setting GPIOs: instead of
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* writing the value of a pin (0 or 1) directly to an output latch, the latch
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* is set by writing a 1 to a "set" register and cleared by writing a 1 to a
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* "clear" register. This way, only an atomic store but no atomic
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* read-modify-write operations are necessary for changing only part of the
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* bits on a port.
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*
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* The same set/clear mechanism is also used for the other writable registers
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* affecting GPIOs, e.g., the direction (input/output) and function (GPIO or
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* MMC) registers.
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*/
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#define PDDATS REG(0x10010314) /* port D data set */
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#define PDDATC REG(0x10010318) /* port D data clear */
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#define PDFUNC REG(0x10010348) /* port D function clear */
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#define PDDIRS REG(0x10010364) /* port D direction set */
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#define PDDIRC REG(0x10010368) /* port D direction clear */
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#define LEDS 10 /* number of LEDs */
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#define GROUP_SEL 11 /* PD11, DAT1 - LED group selection */
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#define LED_MASK 0x3f00 /* all the LED groups and GROUP_SEL */
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#define DELAY_US 50000
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#define PAGE_SIZE 4096
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#define GPIO_BASE 0x10010000
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#define REG(n) (*(uint32_t *) (mem+(n)-GPIO_BASE))
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static volatile void *mem;
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/* ----- Command-line parsing ---------------------------------------------- */
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static int map(int g)
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static int map(int group)
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{
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switch (g) {
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switch (group) {
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case 0:
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return 12;
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return 12; /* PD12, DAT2 */
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case 1:
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return 13;
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return 13; /* PD13, DAT3/CD */
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case 2:
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return 8;
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return 8; /* PD08, CMD */
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case 3:
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return 9;
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return 9; /* PD09, CLK */
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case 4:
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return 10;
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return 10; /* PD10, DAT0 */
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default:
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abort();
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}
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@ -65,18 +78,18 @@ static void set(int n)
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{
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if (n & 1) {
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REG(PDDATC) = LED_MASK;
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REG(PDDATS) = 1 << map(n >> 1);
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PDDATC = LED_MASK;
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PDDATS = 1 << map(n >> 1);
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} else {
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REG(PDDATS) = LED_MASK;
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REG(PDDATC) = 1 << map(n >> 1);
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PDDATS = LED_MASK;
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PDDATC = 1 << map(n >> 1);
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}
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}
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static void die(int sig)
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{
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REG(PDDIRC) = LED_MASK;
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PDDIRC = LED_MASK; /* make all MMC pins inputs again */
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_exit(0);
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}
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@ -99,8 +112,8 @@ int main(int argc, char **argv)
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signal(SIGINT, die);
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REG(PDFUNC) = LED_MASK;
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REG(PDDIRS) = LED_MASK;
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PDFUNC = LED_MASK; /* make all MMC pins GPIOs */
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PDDIRS = LED_MASK; /* make all MMC pins outputs */
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while (1) {
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for (i = 0; i != LEDS-1; i++) {
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