rp2: Add initial HSTX implementation.

Signed-off-by: Dryw Wade <dryw.wade@sparkfun.com>

Author: sfe-SparkFro

ports/rp2/CMakeLists.txt

@@ -172,6 +172,7 @@ set(MICROPY_SOURCE_PORT
     mutex_extra.c
     pendsv.c
     rp2_flash.c
+    rp2_hstx.c
     rp2_pio.c
     rp2_psram.c
     rp2_dma.c
@@ -199,6 +200,7 @@ set(MICROPY_SOURCE_QSTR
     ${MICROPY_PORT_DIR}/modrp2.c
     ${MICROPY_PORT_DIR}/modos.c
     ${MICROPY_PORT_DIR}/rp2_flash.c
+    ${MICROPY_PORT_DIR}/rp2_hstx.c
     ${MICROPY_PORT_DIR}/rp2_pio.c
     ${MICROPY_PORT_DIR}/rp2_dma.c
     ${CMAKE_BINARY_DIR}/pins_${MICROPY_BOARD}.c

ports/rp2/main.c

@@ -190,6 +190,9 @@ int main(int argc, char **argv) {
         // Initialise sub-systems.
         readline_init0();
         machine_pin_init();
+        #ifdef PICO_RP2350
+        rp2_hstx_init();
+        #endif
         rp2_pio_init();
         rp2_dma_init();
         machine_i2s_init0();
@@ -252,6 +255,9 @@ int main(int argc, char **argv) {
         machine_i2s_deinit_all();
         rp2_dma_deinit();
         rp2_pio_deinit();
+        #ifdef PICO_RP2350
+        rp2_hstx_deinit();
+        #endif
         #if MICROPY_PY_BLUETOOTH
         mp_bluetooth_deinit();
         #endif

ports/rp2/modrp2.c

@@ -97,6 +97,10 @@ static const mp_rom_map_elem_t rp2_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_DMA),                 MP_ROM_PTR(&rp2_dma_type) },
     { MP_ROM_QSTR(MP_QSTR_bootsel_button),      MP_ROM_PTR(&rp2_bootsel_button_obj) },
 
+    #ifdef PICO_RP2350
+    { MP_ROM_QSTR(MP_QSTR_HSTX),                MP_ROM_PTR(&rp2_hstx_type) },
+    #endif
+
     #if MICROPY_PY_NETWORK_CYW43
     // Deprecated (use network.country instead).
     { MP_ROM_QSTR(MP_QSTR_country),             MP_ROM_PTR(&mod_network_country_obj) },

ports/rp2/modrp2.h

@@ -33,6 +33,12 @@ extern const mp_obj_type_t rp2_pio_type;
 extern const mp_obj_type_t rp2_state_machine_type;
 extern const mp_obj_type_t rp2_dma_type;
 
+#ifdef PICO_RP2350
+extern const mp_obj_type_t rp2_hstx_type;
+void rp2_hstx_init(void);
+void rp2_hstx_deinit(void);
+#endif
+
 void rp2_pio_init(void);
 void rp2_pio_deinit(void);