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Updated Chapter 11 code

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Kevin Thomas
2025-09-27 18:54:44 -07:00
parent 8dfca5b43f
commit 6154d18d85
1 changed files with 62 additions and 12 deletions
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0x000b_integer-data-type/0x000b_integer-data-type.c
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@@ -1,17 +1,67 @@
#include <stdio.h> #include <stdio.h>
#include "pico/stdlib.h" #include "pico/stdlib.h"
int main(void) { int main(void) {
uint8_t age = 0; uint8_t age = 43;
int8_t range = 0; int8_t range = -42;
age = 43;
range = -42;
stdio_init_all(); stdio_init_all();
while (true) { __asm volatile (
printf("age: %d\r\n", age); "ldr r3, =0x40038000\n" // address of PADS_BANK0
"ldr r2, =0x40028004\n" // address of IO_BANK0 GPIO0.ctrl
"movs r0, #16\n" // GPIO16 (start pin)
"init_loop:\n" // loop start
"lsls r1, r0, #2\n" // pin * 4 (pad offset)
"adds r4, r3, r1\n" // PADS base + offset
"ldr r5, [r4]\n" // load current config
"bic r5, r5, #0x180\n" // clear OD+ISO
"orr r5, r5, #0x40\n" // set IE
"str r5, [r4]\n" // store updated config
"lsls r1, r0, #3\n" // pin * 8 (ctrl offset)
"adds r4, r2, r1\n" // IO_BANK0 base + offset
"ldr r5, [r4]\n" // load current config
"bic r5, r5, #0x1f\n" // clear FUNCSEL bits [4:0]
"orr r5, r5, #5\n" // set FUNCSEL = 5 (SIO)
"str r5, [r4]\n" // store updated config
"mov r4, r0\n" // pin
"movs r5, #1\n" // bit 1; used for OUT/OE writes
"mcrr p0, #4, r4, r5, c4\n" // gpioc_bit_oe_put(pin,1)
"adds r0, r0, #1\n" // increment pin
"cmp r0, #20\n" // stop after pin 18
"blt init_loop\n" // loop until r0 == 20
);
uint32_t pin = 16;
while (1) {
__asm volatile (
"mov r4, %0\n" // pin
"movs r5, #0x01\n" // bit 1; used for OUT/OE writes
"mcrr p0, #4, r4, r5, c0\n" // gpioc_bit_out_put(16, 1)
:
: "r"(pin)
: "r4","r5"
);
sleep_ms(500);
__asm volatile (
"mov r4, %0\n" // pin
"movs r5, #0\n" // bit 0; used for OUT/OE writes
"mcrr p0, #4, r4, r5, c0\n" // gpioc_bit_out_put(16, 0)
:
: "r"(pin)
: "r4","r5"
);
sleep_ms(500);
pin++;
if (pin > 18) pin = 16;
printf("age: %d\r\n", age);
printf("range: %d\r\n", range); printf("range: %d\r\n", range);
} }
} }