def spi_init(self):
esp.gpio_pad_select_gpio(self.cs)
# Initialize the SPI bus, if needed
if self.miso >= 0 and self.mosi >= 0 and self.clk >= 0:
esp.gpio_pad_select_gpio(self.miso)
esp.gpio_pad_select_gpio(self.mosi)
esp.gpio_pad_select_gpio(self.clk)
esp.gpio_set_direction(self.miso, esp.GPIO_MODE.INPUT)
esp.gpio_set_pull_mode(self.miso, esp.GPIO.PULLUP_ONLY)
esp.gpio_set_direction(self.mosi, esp.GPIO_MODE.OUTPUT)
esp.gpio_set_direction(self.clk, esp.GPIO_MODE.OUTPUT)
buscfg = esp.spi_bus_config_t({
"miso_io_num": self.miso,
"mosi_io_num": self.mosi,
"sclk_io_num": self.clk,
"quadwp_io_num": -1,
"quadhd_io_num": -1,
"max_transfer_sz": 128,
})
ret = esp.spi_bus_initialize(self.spihost, buscfg, 1)
if ret != 0:
raise RuntimeError("Failed initializing SPI bus")
# Register finalizer callback to deinit SPI. This gets called on soft reset.
self.finalizer = lvesp32.cb_finalizer(self.deinit)
# Attach the xpt2046 to the SPI bus
devcfg = esp.spi_device_interface_config_t({
"clock_speed_hz":
self.mhz * 1000 * 1000,
"mode":
0, # SPI mode 0
"spics_io_num":
self.cs, # CS pin
"queue_size":
2,
"duty_cycle_pos":
128,
})
ptr_to_spi = esp.C_Pointer()
ret = esp.spi_bus_add_device(self.spihost, devcfg, ptr_to_spi)
if ret != 0:
raise RuntimeError("Failed adding SPI device")
self.spi = ptr_to_spi.ptr_val
def disp_spi_init(self):
# Register finalizer callback to deinit SPI.
# This would get called on soft reset.
self.finalizer = lvesp32.cb_finalizer(self.deinit)
lvesp32.init()
buscfg = esp.spi_bus_config_t({
"miso_io_num": self.miso,
"mosi_io_num": self.mosi,
"sclk_io_num": self.clk,
"quadwp_io_num": -1,
"quadhd_io_num": -1,
"max_transfer_sz": self.buf_size,
})
devcfg = esp.spi_device_interface_config_t({
"clock_speed_hz":
self.mhz * 1000 * 1000, # Clock out at DISP_SPI_MHZ MHz
"mode":
0, # SPI mode 0
"spics_io_num":
self.cs, # CS pin
"queue_size":
2,
#"flags": esp.SPI_DEVICE.HALFDUPLEX,
"duty_cycle_pos":
128,
})
if self.hybrid and hasattr(esp, 'ili9341_post_cb_isr'):
devcfg.pre_cb = None
devcfg.post_cb = esp.ili9341_post_cb_isr
else:
devcfg.pre_cb = esp.spi_pre_cb_isr
devcfg.post_cb = esp.spi_post_cb_isr
esp.gpio_pad_select_gpio(self.cs)
# Initialize the SPI bus, if needed.
if buscfg.miso_io_num >= 0 and \
buscfg.mosi_io_num >= 0 and \
buscfg.sclk_io_num >= 0:
esp.gpio_pad_select_gpio(self.miso)
esp.gpio_pad_select_gpio(self.mosi)
esp.gpio_pad_select_gpio(self.clk)
esp.gpio_set_direction(self.miso, esp.GPIO_MODE.INPUT)
esp.gpio_set_pull_mode(self.miso, esp.GPIO.PULLUP_ONLY)
esp.gpio_set_direction(self.mosi, esp.GPIO_MODE.OUTPUT)
esp.gpio_set_direction(self.clk, esp.GPIO_MODE.OUTPUT)
ret = esp.spi_bus_initialize(self.spihost, buscfg, 1)
if ret != 0: raise RuntimeError("Failed initializing SPI bus")
self.trans_buffer = esp.heap_caps_malloc(TRANS_BUFFER_LEN,
esp.MALLOC_CAP.DMA)
self.cmd_trans_data = self.trans_buffer.__dereference__(1)
self.word_trans_data = self.trans_buffer.__dereference__(4)
# Attach the LCD to the SPI bus
ptr_to_spi = esp.C_Pointer()
ret = esp.spi_bus_add_device(self.spihost, devcfg, ptr_to_spi)
if ret != 0: raise RuntimeError("Failed adding SPI device")
self.spi = ptr_to_spi.ptr_val
self.bytes_transmitted = 0
completed_spi_transaction = esp.spi_transaction_t()
cast_spi_transaction_instance = esp.spi_transaction_t.cast_instance
def post_isr(arg):
reported_transmitted = self.bytes_transmitted
if reported_transmitted > 0:
print('- Completed DMA of %d bytes (mem_free=0x%X)' %
(reported_transmitted, gc.mem_free()))
self.bytes_transmitted -= reported_transmitted
# Called in ISR context!
def flush_isr(spi_transaction_ptr):
lv.disp_flush_ready(self.disp_drv)
# esp.spi_device_release_bus(self.spi)
esp.get_ccount(self.end_time_ptr)
# cast_spi_transaction_instance(completed_spi_transaction, spi_transaction_ptr)
# self.bytes_transmitted += completed_spi_transaction.length
# try:
# micropython.schedule(post_isr, None)
# except RuntimeError:
# pass
self.spi_callbacks = esp.spi_transaction_set_cb(None, flush_isr)
def spi_init(self):
buscfg = esp.spi_bus_config_t({
"miso_io_num": self.miso,
"mosi_io_num": self.mosi,
"sclk_io_num": self.clk,
"quadwp_io_num": -1,
"quadhd_io_num": -1,
"max_transfer_sz": 4,
})
devcfg = esp.spi_device_interface_config_t({
"command_bits":
9, # Actually 8, but need another cycle before xpt starts transmitting response, see Figure 12 on the datasheet.
"clock_speed_hz":
self.mhz * 1000 * 1000,
"mode":
0, # SPI mode 0
"spics_io_num":
self.cs, # CS pin
"queue_size":
self.max_cmds,
"flags":
esp.SPI_DEVICE.HALFDUPLEX,
"duty_cycle_pos":
128,
})
esp.gpio_pad_select_gpio(self.cs)
# Initialize the SPI bus, if needed
if buscfg.miso_io_num >= 0 and \
buscfg.mosi_io_num >= 0 and \
buscfg.sclk_io_num >= 0:
esp.gpio_pad_select_gpio(self.miso)
esp.gpio_pad_select_gpio(self.mosi)
esp.gpio_pad_select_gpio(self.clk)
esp.gpio_set_direction(self.miso, esp.GPIO_MODE.INPUT)
esp.gpio_set_pull_mode(self.miso, esp.GPIO.PULLUP_ONLY)
esp.gpio_set_direction(self.mosi, esp.GPIO_MODE.OUTPUT)
esp.gpio_set_direction(self.clk, esp.GPIO_MODE.OUTPUT)
ret = esp.spi_bus_initialize(self.spihost, buscfg, 1)
if ret != 0: raise RuntimeError("Failed initializing SPI bus")
# Register finalizer callback to deinit SPI.
# This would get called on soft reset.
self.finalizer = lvesp32.cb_finalizer(self.deinit)
# Attach the xpt2046 to the SPI bus
ptr_to_spi = esp.C_Pointer()
ret = esp.spi_bus_add_device(self.spihost, devcfg, ptr_to_spi)
if ret != 0: raise RuntimeError("Failed adding SPI device")
self.spi = ptr_to_spi.ptr_val
# Prepare transactions. Each response is 16bit long
self.trans = [
esp.spi_transaction_t({
'rx_buffer': bytearray(2),
'rxlength': 16
}) for i in range(0, self.max_cmds)
]