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msp432p401lp-cc256x: re-work baudrate usage

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This commit is contained in:
Matthias Ringwald 2020-11-11 23:33:16 +01:00
parent 9faef3b010
commit 0084ad25a0
1 changed files with 47 additions and 39 deletions
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86
port/msp432p401lp-cc256x/main.c
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@ -223,14 +223,14 @@ Pin 37: BTCTS=GPIO-P5.6
static eUSCI_UART_ConfigV1 uartConfig =
{
EUSCI_A_UART_CLOCKSOURCE_SMCLK, // SMCLK Clock Source
13, // BRDIV = 13
0, // UCxBRF = 0
37, // UCxBRS = 37
0 , // BRDIV (template)
0, // UCxBRF (template)
0 , // UCxBRS (template)
EUSCI_A_UART_NO_PARITY, // No Parity
EUSCI_A_UART_LSB_FIRST, // MSB First
EUSCI_A_UART_ONE_STOP_BIT, // One stop bit
EUSCI_A_UART_MODE, // UART mode
EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION, // Oversampling
EUSCI_A_UART_MODE, // UART mode: normal
0, // Oversampling (template)
EUSCI_A_UART_8_BIT_LEN, // 8 bit
};
@ -242,29 +242,38 @@ static struct baudrate_config {
uint8_t second_mod_reg;
uint8_t oversampling;
} baudrate_configs[] = {
#if 0
// Config for 24 Mhz
{ 115200, 13, 0, 37, 1},
{ 230400, 6, 8, 32, 1},
{ 460800, 3, 4, 2, 1},
{ 921600, 1, 10, 0, 1},
{ 1000000, 1, 8, 0, 1},
{ 2000000, 12, 0, 0, 0},
{ 3000000, 8, 0, 0, 0},
{ 3000000, 6, 0, 0, 0},
#else
// Config for 48 Mhz
{ 57600, 52, 1, 37, 1},
{ 115200, 26, 1, 111, 1},
{ 230400, 13, 0, 37, 1},
{ 460800, 6, 8, 32, 1},
{ 921600, 3, 4, 2, 1},
{ 1000000, 3, 0, 0, 1},
{ 2000000, 1, 8, 0, 1},
{ 3000000, 16, 0, 0, 0},
{ 3000000, 12, 0, 0, 0},
#endif
{ 1000000, 3, 0, 0, 1},
{ 2000000, 1, 8, 0, 1},
{ 3000000, 1, 0, 0, 1},
{ 4000000, 12, 0, 0, 0},
};
// return true if ok
static bool hal_uart_dma_config(uint32_t baud){
int index = -1;
int i;
for (i=0;i<sizeof(baudrate_configs)/sizeof(struct baudrate_config);i++){
if (baudrate_configs[i].baudrate == baud){
index = i;
break;
}
}
if (index < 0) return false;
uartConfig.clockPrescalar = baudrate_configs[index].clock_prescalar;
uartConfig.firstModReg = baudrate_configs[index].first_mod_reg;
uartConfig.secondModReg = baudrate_configs[index].second_mod_reg;
uartConfig.overSampling = baudrate_configs[index].oversampling ? EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION : EUSCI_A_UART_LOW_FREQUENCY_BAUDRATE_GENERATION;
printf("Pre %u, first %u, second %u\n", uartConfig.clockPrescalar, uartConfig.firstModReg, uartConfig.secondModReg );
return true;
}
static void hal_uart_dma_enable_rx(void){
// MAP_GPIO_setOutputLowOnPin(GPIO_PORT_P5, GPIO_PIN6);
HWREG16(&P5->OUT) &= ~GPIO_PIN6;
@ -444,26 +453,14 @@ void hal_uart_dma_init(void){
}
int hal_uart_dma_set_baud(uint32_t baud){
int index = -1;
int i;
for (i=0;i<sizeof(baudrate_configs)/sizeof(struct baudrate_config);i++){
if (baudrate_configs[i].baudrate == baud){
index = i;
break;
}
}
if (index < 0) return -1;
hal_uart_dma_config(baud);
MAP_UART_disableModule(EUSCI_A2_BASE);
uartConfig.clockPrescalar = baudrate_configs[index].clock_prescalar;
uartConfig.firstModReg = baudrate_configs[index].first_mod_reg;
uartConfig.secondModReg = baudrate_configs[index].second_mod_reg;
uartConfig.overSampling = baudrate_configs[index].oversampling;
MAP_UART_initModule(EUSCI_A2_BASE, &uartConfig);
/* BaudRate Control Register */
uint32_t moduleInstance = EUSCI_A2_BASE;
const eUSCI_UART_ConfigV1 *config = &uartConfig;
EUSCI_A_CMSIS(moduleInstance)->BRW = config->clockPrescalar;
EUSCI_A_CMSIS(moduleInstance)->MCTLW = ((config->secondModReg << 8) + (config->firstModReg << 4) + config->overSampling);
MAP_UART_enableModule(EUSCI_A2_BASE);
UNUSED(baud);
return 0;
}
@ -486,6 +483,17 @@ void hal_uart_dma_set_block_sent( void (*the_block_handler)(void)){
}
void hal_uart_dma_send_block(const uint8_t * data, uint16_t len){
#if 0
static uint32_t baudrate = 115200;
if (baudrate == 115200){
baudrate = 57600;
} else {
baudrate = 115200;
}
printf("baud %u\n", baudrate);
hal_uart_dma_set_baud(baudrate);
#endif
MAP_DMA_setChannelTransfer(DMA_CH4_EUSCIA2TX | UDMA_PRI_SELECT, UDMA_MODE_BASIC, (uint8_t *) data,
(void *) MAP_UART_getTransmitBufferAddressForDMA(EUSCI_A2_BASE),
len);