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- revert the use of serial init for set line coding 

- update ch34x_get_lcr and ch34x_get_factor_divisor
This commit is contained in:
hathach 2024-01-19 01:06:24 +07:00
parent 3968a0fff8
commit 30eb35f17f
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GPG Key ID: F5D50C6D51D17CBA
2 changed files with 90 additions and 68 deletions
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152
src/class/cdc/cdc_host.c
View File

@ -1179,7 +1179,7 @@ static void cp210x_process_config(tuh_xfer_t* xfer) {
enum {
CONFIG_CH34X_READ_VERSION = 0,
CONFIG_CH34X_SET_LINE_CODING,
CONFIG_CH34X_SERIAL_INIT,
CONFIG_CH34X_SPECIAL_REG_WRITE,
CONFIG_CH34X_FLOW_CONTROL,
CONFIG_CH34X_MODEM_CONTROL,
@ -1231,7 +1231,9 @@ static bool ch34x_set_request(cdch_interface_t* p_cdc, uint8_t direction, uint8_
if (buffer && length > 0) {
enum_buf = usbh_get_enum_buf();
tu_memcpy_s(enum_buf, CFG_TUH_ENUMERATION_BUFSIZE, buffer, length);
if (direction == TUSB_DIR_OUT) {
tu_memcpy_s(enum_buf, CFG_TUH_ENUMERATION_BUFSIZE, buffer, length);
}
}
tuh_xfer_t xfer = {
@ -1257,8 +1259,8 @@ static inline bool ch34x_control_in(cdch_interface_t* p_cdc, uint8_t request, ui
complete_cb, user_data);
}
static bool ch34x_write_reg(cdch_interface_t* p_cdc, uint16_t reg, uint16_t value, tuh_xfer_cb_t complete_cb, uintptr_t user_data) {
return ch34x_control_out(p_cdc, CH34X_REQ_WRITE_REG, reg, value, complete_cb, user_data);
static bool ch34x_write_reg(cdch_interface_t* p_cdc, uint16_t reg, uint16_t reg_value, tuh_xfer_cb_t complete_cb, uintptr_t user_data) {
return ch34x_control_out(p_cdc, CH34X_REQ_WRITE_REG, reg, reg_value, complete_cb, user_data);
}
//static bool ch34x_read_reg_request ( cdch_interface_t* p_cdc, uint16_t reg,
@ -1292,10 +1294,11 @@ static void ch34x_control_complete(tuh_xfer_t* xfer) {
case CH34X_REQ_WRITE_REG:
// register write request
switch (value) {
case 0x1312:
case CH34X_REG16_DIVISOR_PRESCALER:
// baudrate write
p_cdc->line_coding.bit_rate = p_cdc->baudrate_requested;
break;
default:
TU_ASSERT(false,); // unexpected register write
break;
@ -1309,6 +1312,7 @@ static void ch34x_control_complete(tuh_xfer_t* xfer) {
} else {
p_cdc->line_state &= (uint8_t ) ~CDC_CONTROL_LINE_STATE_RTS;
}
if (~value & CH34X_BIT_DTR) {
p_cdc->line_state |= CDC_CONTROL_LINE_STATE_DTR;
} else {
@ -1377,8 +1381,8 @@ static void ch34x_control_complete(tuh_xfer_t* xfer) {
}
}
// calc baudrate factor and divisor
static bool ch34x_get_factor_divisor(uint32_t baval, uint8_t* factor, uint8_t* divisor) {
// calculate divisor and prescaler for baudrate, return it as 16-bit combined value
static uint16_t ch34x_get_divisor_prescaler(uint32_t baval) {
uint8_t a;
uint8_t b;
uint32_t c;
@ -1410,7 +1414,7 @@ static bool ch34x_get_factor_divisor(uint32_t baval, uint8_t* factor, uint8_t* d
}
a = (unsigned char) (c / baval);
if (a == 0 || a == 0xFF) {
return false;
return 0;
}
if ((c / a - baval) > (baval - c / (a + 1))) {
a++;
@ -1418,74 +1422,75 @@ static bool ch34x_get_factor_divisor(uint32_t baval, uint8_t* factor, uint8_t* d
a = (uint8_t) (256 - a);
break;
}
*factor = a;
*divisor = b;
return true;
// reg divisor = a, reg prescaler = b
// According to linux code we need to set bit 7 of UCHCOM_REG_BPS_PRE,
// otherwise the chip will buffer data.
return (uint16_t) (a << 8 | 0x80 | b);
}
// calc lcr register value (data bits, parity, stop bits)
static bool ch34x_get_lcr(cdc_line_coding_t const* line_coding, uint8_t *lcr) {
*lcr = CH34X_LCR_ENABLE_RX | CH34X_LCR_ENABLE_TX;
switch (line_coding->data_bits) {
case 5:
*lcr |= CH34X_LCR_CS5;
break;
case 6:
*lcr |= CH34X_LCR_CS6;
break;
case 7:
*lcr |= CH34X_LCR_CS7;
break;
case 8:
*lcr |= CH34X_LCR_CS8;
break;
default:
TU_ASSERT (false); // data_bits not supported
break;
static inline uint8_t ch34x_get_lcr(uint8_t stop_bits, uint8_t parity, uint8_t data_bits) {
uint8_t lcr = CH34X_LCR_ENABLE_RX | CH34X_LCR_ENABLE_TX;
TU_VERIFY(data_bits >= 5, 0);
lcr |= (uint8_t) (data_bits - 5);
if (parity) {
lcr |= CH34X_LCR_ENABLE_PAR;
}
TU_ASSERT (line_coding->parity == CDC_LINE_CODING_PARITY_NONE || // supported parities
line_coding->parity == CDC_LINE_CODING_PARITY_ODD || line_coding->parity == CDC_LINE_CODING_PARITY_EVEN ||
line_coding->parity == CDC_LINE_CODING_PARITY_MARK || line_coding->parity == CDC_LINE_CODING_PARITY_SPACE);
if (line_coding->parity != CDC_LINE_CODING_PARITY_NONE) {
*lcr |= CH34X_LCR_ENABLE_PAR;
if (line_coding->parity == CDC_LINE_CODING_PARITY_EVEN || line_coding->parity == CDC_LINE_CODING_PARITY_SPACE) {
*lcr |= CH34X_LCR_PAR_EVEN;
}
if (line_coding->parity == CDC_LINE_CODING_PARITY_MARK || line_coding->parity == CDC_LINE_CODING_PARITY_SPACE) {
*lcr |= CH34X_LCR_MARK_SPACE;
}
switch(parity) {
case CDC_LINE_CODING_PARITY_EVEN:
lcr |= CH34X_LCR_PAR_EVEN;
break;
case CDC_LINE_CODING_PARITY_MARK:
lcr |= CH34X_LCR_MARK_SPACE;
break;
case CDC_LINE_CODING_PARITY_SPACE:
lcr |= CH34X_LCR_MARK_SPACE | CH34X_LCR_PAR_EVEN;
break;
default: break;
}
TU_ASSERT (line_coding->stop_bits == CDC_LINE_CODING_STOP_BITS_1 ||
line_coding->stop_bits == CDC_LINE_CODING_STOP_BITS_2); // not supported 1.5 stop bits
if (line_coding->stop_bits == CDC_LINE_CODING_STOP_BITS_2) {
*lcr |= CH34X_LCR_STOP_BITS_2;
// 1.5 stop bits not supported
TU_VERIFY(stop_bits != CDC_LINE_CODING_STOP_BITS_1_5, 0);
if (stop_bits == CDC_LINE_CODING_STOP_BITS_2) {
lcr |= CH34X_LCR_STOP_BITS_2;
}
return lcr;
}
//static bool ch34x_set_line_data(cdch_interface_t* p_cdc, uint8_t stop_bits, uint8_t parity, uint8_t data_bits,
// tuh_xfer_cb_t complete_cb, uintptr_t user_data) {
static bool ch34x_set_baudrate(cdch_interface_t* p_cdc, uint32_t baudrate,
tuh_xfer_cb_t complete_cb, uintptr_t user_data) {
p_cdc->baudrate_requested = baudrate;
p_cdc->user_control_cb = complete_cb;
uint16_t const div_ps = ch34x_get_divisor_prescaler(baudrate);
TU_VERIFY(div_ps != 0);
TU_ASSERT(ch34x_write_reg(p_cdc, CH34X_REG16_DIVISOR_PRESCALER, div_ps,
complete_cb ? ch34x_control_complete : NULL, user_data));
return true;
}
static bool ch34x_set_line_coding(cdch_interface_t* p_cdc, cdc_line_coding_t const* line_coding,
tuh_xfer_cb_t complete_cb, uintptr_t user_data) {
p_cdc->baudrate_requested = line_coding->bit_rate;
p_cdc->user_control_cb = complete_cb;
uint8_t factor, divisor, lcr;
TU_ASSERT (ch34x_get_factor_divisor(line_coding->bit_rate, &factor, &divisor));
TU_ASSERT (ch34x_get_lcr(line_coding, &lcr));
TU_ASSERT (ch34x_control_out(p_cdc, CH34X_REQ_SERIAL_INIT, (uint16_t) (lcr << 8 | 0x9c), (uint16_t) (factor << 8 | 0x80 | divisor),
complete_cb ? ch34x_control_complete : NULL, user_data));
return true;
}
// p_cdc->baudrate_requested = line_coding->bit_rate;
// p_cdc->user_control_cb = complete_cb;
// uint8_t factor, divisor, lcr;
// TU_ASSERT (ch34x_get_factor_divisor(line_coding->bit_rate, &factor, &divisor));
// TU_ASSERT (ch34x_get_lcr(line_coding, &lcr));
// TU_ASSERT (ch34x_control_out(p_cdc, CH34X_REQ_SERIAL_INIT, (uint16_t) (lcr << 8 | 0x9c), (uint16_t) (factor << 8 | 0x80 | divisor),
// complete_cb ? ch34x_control_complete : NULL, user_data));
(void) p_cdc;
(void) line_coding;
(void) complete_cb;
(void) user_data;
static bool ch34x_set_baudrate(cdch_interface_t* p_cdc, uint32_t baudrate,
tuh_xfer_cb_t complete_cb, uintptr_t user_data) {
p_cdc->baudrate_requested = baudrate;
p_cdc->user_control_cb = complete_cb;
uint8_t factor, divisor;
TU_ASSERT (ch34x_get_factor_divisor(baudrate, &factor, &divisor));
uint16_t const value = (uint16_t ) (factor << 8 | 0x80 | divisor);
TU_ASSERT (ch34x_write_reg(p_cdc, 0x1312, value,
complete_cb ? ch34x_control_complete : NULL, user_data));
return true;
}
@ -1515,35 +1520,46 @@ static void ch34x_process_config(tuh_xfer_t* xfer) {
switch (state) {
case CONFIG_CH34X_READ_VERSION:
// version read request
TU_LOG_DRV("[%u] CDCh CH34x attempt to read Chip Version\r\n", p_cdc->daddr);
TU_ASSERT (ch34x_control_in(p_cdc, CH34X_REQ_READ_VERSION, 0, 0, buffer, 2, ch34x_process_config, CONFIG_CH34X_SET_LINE_CODING),);
TU_ASSERT (ch34x_control_in(p_cdc, CH34X_REQ_READ_VERSION, 0, 0, buffer, 2, ch34x_process_config, CONFIG_CH34X_SERIAL_INIT),);
break;
case CONFIG_CH34X_SET_LINE_CODING:
case CONFIG_CH34X_SERIAL_INIT: {
// handle version read data, set CH34x line coding (incl. baudrate)
uint8_t version = xfer->buffer[0];
TU_LOG_DRV("[%u] CDCh CH34x Chip Version = %02x\r\n", p_cdc->daddr, version);
// only versions >= 0x30 are tested, below 0x30 seems having other programming, see drivers from WCH vendor, Linux kernel and FreeBSD
TU_ASSERT (version >= 0x30,);
TU_ASSERT (ch34x_set_line_coding(p_cdc, &line_coding, ch34x_process_config, CONFIG_CH34X_SPECIAL_REG_WRITE),);
uint16_t const div_ps = ch34x_get_divisor_prescaler(line_coding.bit_rate);
TU_ASSERT(div_ps != 0, );
uint8_t const lcr = ch34x_get_lcr(line_coding.stop_bits, line_coding.parity, line_coding.data_bits);
TU_ASSERT (ch34x_control_out(p_cdc, CH34X_REQ_SERIAL_INIT, tu_u16(lcr, 0x9c), div_ps,
ch34x_process_config, CONFIG_CH34X_SPECIAL_REG_WRITE),);
break;
}
case CONFIG_CH34X_SPECIAL_REG_WRITE:
// do special reg write, purpose unknown, overtaken from WCH driver
TU_ASSERT (ch34x_write_reg(p_cdc, 0x0f2c, 0x0007, ch34x_process_config, CONFIG_CH34X_FLOW_CONTROL),);
break;
case CONFIG_CH34X_FLOW_CONTROL:
// no hardware flow control
TU_ASSERT (ch34x_write_reg(p_cdc, 0x2727, 0x0000, ch34x_process_config, CONFIG_CH34X_MODEM_CONTROL),);
break;
case CONFIG_CH34X_MODEM_CONTROL:
// !always! set modem controls RTS/DTR (CH34x has no reset state after CH34X_REQ_SERIAL_INIT)
TU_ASSERT (ch34x_set_modem_ctrl(p_cdc, CFG_TUH_CDC_LINE_CONTROL_ON_ENUM, ch34x_process_config, CONFIG_CH34X_COMPLETE),);
break;
case CONFIG_CH34X_COMPLETE:
set_config_complete(p_cdc, idx, itf_num);
break;
default:
TU_ASSERT (false,); // something gone wrong, should never reached
TU_ASSERT (false,);
break;
}
}

6
src/class/cdc/serial/ch34x.h
View File

@ -59,6 +59,12 @@
#define CH34X_REG_MCR_MSR2 0x07
#define CH34X_NBREAK_BITS 0x01
#define CH341_REG_0x0F 0x0F // undocumented register
#define CH341_REG_0x2C 0x2C // undocumented register
#define CH341_REG_0x27 0x27 // hardware flow control (cts/rts)
#define CH34X_REG16_DIVISOR_PRESCALER TU_U16(CH34X_REG_DIVISOR, CH34X_REG_PRESCALER)
// modem control bits
#define CH34X_BIT_RTS ( 1 << 6 )
#define CH34X_BIT_DTR ( 1 << 5 )