rp2040 driver works (ugly)

1 files changed, 0 insertions, 73 deletions

diff --git a/lib/pbdrv/drv/rp2040/mod.c b/lib/pbdrv/drv/rp2040/mod.c
deleted file mode 100644
index 6becdee..0000000
--- a/lib/pbdrv/drv/rp2040/mod.c
+++ /dev/null
@@ -1,73 +0,0 @@
-#include "mod.h"
-
-#include "../../pb.h"
-#include "../../pb-types.h"
-#include "../../pb-mod.h"
-
-#include <hardware/i2c.h>
-#include <hardware/gpio.h>
-#include <pico/i2c_slave.h>
-
-#define PBDRV_I2C i2c0
-#define BUF_SIZE 256
-
-static volatile bool pbdrv_i2c_msg_avail = false;
-static uint8_t data[BUF_SIZE];
-static size_t size = 0;
-
-// TODO: create event group instead of pbdrv_i2c_msg_avail
-// TODO: create freertos task that monitors the pbdrv_i2c_msg_avail flag and
-// calls pbdrv_i2c_recv when a message is received
-
-
-/**
- * \note this function is called from the I2C ISR, and should return as quickly
- * as possible.
- */
-static void recv_event(i2c_inst_t *i2c, i2c_slave_event_t event) {
-	// message needs to be handled first
-	if (pbdrv_i2c_msg_avail) return;
-
-	switch (event) {
-		case I2C_SLAVE_RECEIVE: {
-			if (size == BUF_SIZE) return;
-			data[size++] = i2c_read_byte_raw(PBDRV_I2C);
-			break;
-		}
-		case I2C_SLAVE_FINISH: {
-			// TODO: handle this w/ queue mechanism instead?
-			// pbdrv_i2c_recv(data, size);
-			pbdrv_i2c_msg_avail = true;
-			size = 0;
-			break;
-		}
-		default: break;
-	}
-}
-
-void pbdrv_setup() {
-	i2c_init(PBDRV_I2C, PB_CLOCK_SPEED_HZ);
-	i2c_slave_init(PBDRV_I2C, PBDRV_MOD_ADDR, &recv_event);
-}
-
-/**
- * While the RP2040's datasheet claims it supports multi-master configurations
- * by implementing bus arbitration, it does not natively support a mode where
- * it is configured as a (multi-)master with a slave address, such that it can
- * be addressed by other multi-masters. This function includes a hacky
- * workaround that teporarily sets the RP2040 to I2C master mode to send a
- * message, and then restores it back to slave mode.
- *
- * This approach results in some received frames being (partially) dropped in
- * the time period between the invocation of this function and the bus becoming
- * idle (and the message is sent).
- */
-__weak void pbdrv_i2c_send(i2c_addr_t addr, const uint8_t * buf, size_t sz) {
-	i2c_set_slave_mode(PBDRV_I2C, false, PBDRV_MOD_ADDR);
-
-	// false to write stop condition to i2c bus
-	i2c_write_timeout_us(PBDRV_I2C, addr, buf, sz, false, PB_TIMEOUT_US);
-
-	i2c_set_slave_mode(PBDRV_I2C, true, PBDRV_MOD_ADDR);
-}
-