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Updated Drivers

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This commit is contained in:
Kevin Thomas
2026-03-23 09:33:04 -04:00
parent 6ee30d0520
commit 91faba6800
31 changed files with 834 additions and 344 deletions
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drivers/0x07_i2c/0x07_i2c.c
+10 -2
View File
@@ -49,13 +49,21 @@
#define I2C_SCL_PIN 3
#define I2C_BAUD 100000
/**
* @brief Application entry point for the I2C bus scanner demo
*
* Initializes I2C1 at 100 kHz on SDA=GPIO2 / SCL=GPIO3 and prints
* a formatted hex table of all responding device addresses over UART,
* repeating every 5 seconds.
*
* @return int Does not return
*/
int main(void) {
stdio_init_all();
i2c_driver_init(I2C_PORT, I2C_SDA_PIN, I2C_SCL_PIN, I2C_BAUD);
printf("I2C driver initialized: I2C%d @ %d Hz SDA=GPIO%d SCL=GPIO%d\r\n",
I2C_PORT, I2C_BAUD, I2C_SDA_PIN, I2C_SCL_PIN);
while (true) {
i2c_driver_scan(I2C_PORT);
sleep_ms(5000);
drivers/0x07_i2c/i2c.c
+42 -20
View File
@@ -33,13 +33,20 @@
#include "hardware/i2c.h"
#include "hardware/gpio.h"
static i2c_inst_t *get_i2c_inst(uint8_t port) {
/**
* @brief Map an I2C port number to its hardware instance pointer
*
* @param port I2C port number (0 for i2c0, 1 for i2c1)
* @return i2c_inst_t* Pointer to the corresponding I2C hardware instance
*/
static i2c_inst_t *_get_i2c_inst(uint8_t port) {
return port == 0 ? i2c0 : i2c1;
}
void i2c_driver_init(uint8_t port, uint32_t sda_pin, uint32_t scl_pin,
uint32_t baud_hz) {
i2c_inst_t *inst = get_i2c_inst(port);
i2c_inst_t *inst = _get_i2c_inst(port);
i2c_init(inst, baud_hz);
gpio_set_function(sda_pin, GPIO_FUNC_I2C);
gpio_set_function(scl_pin, GPIO_FUNC_I2C);
@@ -47,29 +54,44 @@ void i2c_driver_init(uint8_t port, uint32_t sda_pin, uint32_t scl_pin,
gpio_pull_up(scl_pin);
}
bool i2c_driver_probe(uint8_t port, uint8_t addr) {
i2c_inst_t *inst = get_i2c_inst(port);
i2c_inst_t *inst = _get_i2c_inst(port);
uint8_t dummy;
return i2c_read_blocking(inst, addr, &dummy, 1, false) >= 0;
}
void i2c_driver_scan(uint8_t port) {
/**
* @brief Print the I2C scan table header over UART
*/
static void _print_scan_header(void) {
printf("\r\nI2C bus scan:\r\n");
printf(" 0 1 2 3 4 5 6 7 8 9 A B C D E F\r\n");
for (uint8_t addr = 0; addr < 128; addr++) {
if (addr % 16 == 0) {
printf("%02X: ", addr);
}
if (addr < 0x08 || addr > 0x77) {
printf(" ");
} else if (i2c_driver_probe(port, addr)) {
printf("%02X ", addr);
} else {
printf("-- ");
}
if (addr % 16 == 15) {
printf("\r\n");
}
}
}
/**
* @brief Print one cell of the scan table for a given address
*
* Prints the row label when the address is at a 16-byte boundary, then
* prints the address if a device responds, dashes if not, or blank if
* the address is in the reserved range. Ends the row at every 16th address.
*
* @param port I2C port number (0 for i2c0, 1 for i2c1)
* @param addr 7-bit I2C address being probed
*/
static void _print_scan_entry(uint8_t port, uint8_t addr) {
if (addr % 16 == 0) printf("%02X: ", addr);
if (addr < 0x08 || addr > 0x77) printf(" ");
else if (i2c_driver_probe(port, addr)) printf("%02X ", addr);
else printf("-- ");
if (addr % 16 == 15) printf("\r\n");
}
void i2c_driver_scan(uint8_t port) {
_print_scan_header();
for (uint8_t addr = 0; addr < 128; addr++)
_print_scan_entry(port, addr);
}