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make CFG_TUH_CDC_LINE_CODING_ON_ENUM optional for ch34x

This commit is contained in:
hathach 2024-01-20 01:42:31 +07:00
parent 55cb713264
commit 87d509d416
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GPG Key ID: F5D50C6D51D17CBA
3 changed files with 21 additions and 18 deletions
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8
examples/host/cdc_msc_hid/src/cdc_app.c
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@ -85,13 +85,17 @@ void tuh_cdc_mount_cb(uint8_t idx) {
itf_info.desc.bInterfaceNumber);
#ifdef CFG_TUH_CDC_LINE_CODING_ON_ENUM
// CFG_TUH_CDC_LINE_CODING_ON_ENUM must be defined for line coding is set by tinyusb in enumeration
// otherwise you need to call tuh_cdc_set_line_coding() first
// If CFG_TUH_CDC_LINE_CODING_ON_ENUM is defined, line coding will be set by tinyusb stack
// while eneumerating new cdc device
cdc_line_coding_t line_coding = {0};
if (tuh_cdc_get_local_line_coding(idx, &line_coding)) {
printf(" Baudrate: %lu, Stop Bits : %u\r\n", line_coding.bit_rate, line_coding.stop_bits);
printf(" Parity : %u, Data Width: %u\r\n", line_coding.parity, line_coding.data_bits);
}
#else
// Set Line Coding upon mounted
cdc_line_coding_t new_line_coding = { 115200, CDC_LINE_CODING_STOP_BITS_1, CDC_LINE_CODING_PARITY_NONE, 8 };
tuh_cdc_set_line_coding(idx, &new_line_coding, NULL, 0);
#endif
}

19
src/class/cdc/cdc_host.c
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@ -1510,10 +1510,11 @@ static void ch34x_process_config(tuh_xfer_t* xfer) {
uint8_t const idx = tuh_cdc_itf_get_index(xfer->daddr, itf_num);
cdch_interface_t* p_cdc = get_itf(idx);
uintptr_t const state = xfer->user_data;
cdc_line_coding_t const line_coding = CFG_TUH_CDC_LINE_CODING_ON_ENUM_CH34X;
uint8_t buffer[2]; // TODO remove
TU_ASSERT (p_cdc,);
// TODO check xfer->result
switch (state) {
case CONFIG_CH34X_READ_VERSION:
TU_LOG_DRV("[%u] CDCh CH34x attempt to read Chip Version\r\n", p_cdc->daddr);
@ -1527,20 +1528,28 @@ static void ch34x_process_config(tuh_xfer_t* xfer) {
// only versions >= 0x30 are tested, below 0x30 seems having other programming, see drivers from WCH vendor, Linux kernel and FreeBSD
TU_ASSERT (version >= 0x30,);
#ifdef CFG_TUH_CDC_LINE_CODING_ON_ENUM
cdc_line_coding_t const line_coding = CFG_TUH_CDC_LINE_CODING_ON_ENUM;
uint8_t const lcr = ch34x_get_lcr(line_coding.stop_bits, line_coding.parity, line_coding.data_bits);
uint16_t const first_arg = tu_u16(lcr, 0x9c);
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);
#else
uint16_t const first_arg = 0;
uint16_t const div_ps = 0;
#endif
// Init CH34x with line coding
TU_ASSERT (ch34x_control_out(p_cdc, CH34X_REQ_SERIAL_INIT, tu_u16(lcr, 0x9c), div_ps,
TU_ASSERT (ch34x_control_out(p_cdc, CH34X_REQ_SERIAL_INIT, first_arg, 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
p_cdc->line_coding = line_coding;
#ifdef CFG_TUH_CDC_LINE_CODING_ON_ENUM
p_cdc->line_coding = ((cdc_line_coding_t) CFG_TUH_CDC_LINE_CODING_ON_ENUM);
#endif
TU_ASSERT (ch34x_write_reg(p_cdc, 0x0f2c, 0x0007, ch34x_process_config, CONFIG_CH34X_FLOW_CONTROL),);
break;

12
src/class/cdc/serial/ch34x.h
View File

@ -27,21 +27,11 @@
#ifndef _CH34X_H_
#define _CH34X_H_
// For simplicity, only the name CH34X is used here,
// but specifically only CH340 and CH341 are supported.
// There is no official documentation for the CH34x chips. Reference can be found
// There is no official documentation for the CH34x (CH340, CH341) chips. Reference can be found
// - https://github.com/WCHSoftGroup/ch341ser_linux
// - https://github.com/torvalds/linux/blob/master/drivers/usb/serial/ch341.c
// - https://github.com/freebsd/freebsd-src/blob/main/sys/dev/usb/serial/uchcom.c
// set line_coding @ enumeration
#ifdef CFG_TUH_CDC_LINE_CODING_ON_ENUM
#define CFG_TUH_CDC_LINE_CODING_ON_ENUM_CH34X CFG_TUH_CDC_LINE_CODING_ON_ENUM
#else // this default is necessary to work properly
#define CFG_TUH_CDC_LINE_CODING_ON_ENUM_CH34X { 9600, CDC_LINE_CONDING_STOP_BITS_1, CDC_LINE_CODING_PARITY_NONE, 8 }
#endif
// USB requests
#define CH34X_REQ_READ_VERSION 0x5F // dec 95
#define CH34X_REQ_WRITE_REG 0x9A // dec 154